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整数的乘除混合运算 – 找空格里的数 1

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Question 1 of 10

1. Question
1 point(s)

找出空格里的数字

6 × 5122 ÷ = 2561

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Question 2 of 10

2. Question
1 point(s)

找出空格里的数字

6 ÷ × 5122 = 256

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Question 3 of 10

3. Question
1 point(s)

找出空格里的数字

7 × 4824 ÷ = 1608

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Question 4 of 10

4. Question
1 point(s)

找出空格里的数字

5 ÷ × 6400 = 320

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Question 5 of 10

5. Question
1 point(s)

找出空格里的数字

8 × 4528 ÷ = 2264

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Question 6 of 10

6. Question
1 point(s)

找出空格里的数字

7 ÷ × 4200 = 210

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Question 7 of 10

7. Question
1 point(s)

找出空格里的数字

9 × 7296 ÷ = 1824

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Question 8 of 10

8. Question
1 point(s)

找出空格里的数字

8 ÷ × 4000 = 160

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Question 9 of 10

9. Question
1 point(s)

找出空格里的数字

5 × 3075 ÷ = 1025

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Incorrect / 1 Points

Question 10 of 10

10. Question
1 point(s)

找出空格里的数字

7 ÷ × 8750 = 245

Correct 1 / 1 Points

Incorrect / 1 Points

整数的加减混合运算 – 找空格里的数

by Ski Admin

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Question 1 of 10

1. Question
1 point(s)

找出空格里的数字

+ 6421 – 10792 = 17166

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Question 2 of 10

2. Question
1 point(s)

找出空格里的数字

38295 – 14923 + = 25591

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Question 3 of 10

3. Question
1 point(s)

找出空格里的数字

52983 + 2319 – = 26826

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Incorrect / 1 Points

Question 4 of 10

4. Question
1 point(s)

找出空格里的数字

63745 – 35427 + = 33961

Correct 1 / 1 Points

Incorrect / 1 Points

Question 5 of 10

5. Question
1 point(s)

找出空格里的数字

+ 7435 – 2103 = 21224

Correct 1 / 1 Points

Incorrect / 1 Points

Question 6 of 10

6. Question
1 point(s)

找出空格里的数字

48563 – + 10982 = 56800

Correct 1 / 1 Points

Incorrect / 1 Points

Question 7 of 10

7. Question
1 point(s)

找出空格里的数字

29587 + – 12345 = 20884

Correct 1 / 1 Points

Incorrect / 1 Points

Question 8 of 10

8. Question
1 point(s)

找出空格里的数字

– 2846 + 14322 = 59332

Correct 1 / 1 Points

Incorrect / 1 Points

Question 9 of 10

9. Question
1 point(s)

找出空格里的数字

39487 + 5213 – = 27136

Correct 1 / 1 Points

Incorrect / 1 Points

Question 10 of 10

10. Question
1 point(s)

找出空格里的数字

50976 – 19876 + = 34724

Correct 1 / 1 Points

Incorrect / 1 Points

整数的加法 – 找空格里的数

by Ski Admin

Question: 找出空格里的加数
Answer: 20439 + {31827} + 24314 = 76580

Instruction:

Addition of three 5 digits integer, with an addend left blank and sum given.

The sum must not exceed 100000.

Make the question just “找出空格里的加数” without the addition of the 3 numbers.

put the addition of the 3 numbers together with the bracket in the answer column.

remove the “答案 = {answer}” in the second column

Question Answer Steps of Solution

找出空格里的加数 18452 + {43829} + 27619 = 89900 89900 – 18452 – 27619 = 43829

找出空格里的加数 21567 + {35016} + 19873 = 76456 76456 – 21567 – 19873 = 35016

找出空格里的加数 19384 + {37420} + 14296 = 71100 71100 – 19384 – 14296 = 37420

找出空格里的加数 27619 + {25138} + 34012 = 86769 86769 – 27619 – 34012 = 25138

找出空格里的加数 14567 + {42731} + 21852 = 79150 79150 – 14567 – 21852 = 42731

找出空格里的加数 23456 + {29874} + 14321 = 67651 67651 – 23456 – 14321 = 29874

找出空格里的加数 17892 + {31607} + 28701 = 78200 78200 – 17892 – 28701 = 31607

找出空格里的加数 20234 + {25165} + 30760 = 76159 76159 – 20234 – 30760 = 25165

找出空格里的加数 28674 + {16821} + 28795 = 74290 74290 – 28674 – 28795 = 16821

找出空格里的加数 13457 + {39862} + 26718 = 80037 80037 – 13457 – 26718 = 39862

Time limit: 0

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Question 1 of 10

1. Question
1 point(s)

找出空格里的加数

27619 + + 34012 = 86769

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Question 2 of 10

2. Question
1 point(s)

找出空格里的加数

14567 + + 21852 = 79150

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Incorrect / 1 Points

Question 3 of 10

3. Question
1 point(s)

找出空格里的加数

23456 + + 14321 = 67651

Correct 1 / 1 Points

Incorrect / 1 Points

Question 4 of 10

4. Question
1 point(s)

找出空格里的加数

17892 + + 28701 = 78200

Correct 1 / 1 Points

Incorrect / 1 Points

Question 5 of 10

5. Question
1 point(s)

找出空格里的加数

20234 + + 30760 = 76159

Correct 1 / 1 Points

Incorrect / 1 Points

Question 6 of 10

6. Question
1 point(s)

找出空格里的加数

28674 + + 28795 = 74290

Correct 1 / 1 Points

Incorrect / 1 Points

Question 7 of 10

7. Question
1 point(s)

找出空格里的加数

13457 + + 26718 = 80037

Correct 1 / 1 Points

Incorrect / 1 Points

Question 8 of 10

8. Question
1 point(s)

找出空格里的加数

18452 + + 27619 = 89900

Correct 1 / 1 Points

Incorrect / 1 Points

Question 9 of 10

9. Question
1 point(s)

找出空格里的加数

21567 + + 19873 = 76456

Correct 1 / 1 Points

Incorrect / 1 Points

Question 10 of 10

10. Question
1 point(s)

找出空格里的加数

19384 + + 14296 = 71100

Correct 1 / 1 Points

Incorrect / 1 Points

Question	Answer	Steps of Solution
找出空格里的加数	18452 + {43829} + 27619 = 89900	89900 – 18452 – 27619 = 43829
找出空格里的加数	21567 + {35016} + 19873 = 76456	76456 – 21567 – 19873 = 35016
找出空格里的加数	19384 + {37420} + 14296 = 71100	71100 – 19384 – 14296 = 37420
找出空格里的加数	27619 + {25138} + 34012 = 86769	86769 – 27619 – 34012 = 25138
找出空格里的加数	14567 + {42731} + 21852 = 79150	79150 – 14567 – 21852 = 42731
找出空格里的加数	23456 + {29874} + 14321 = 67651	67651 – 23456 – 14321 = 29874
找出空格里的加数	17892 + {31607} + 28701 = 78200	78200 – 17892 – 28701 = 31607
找出空格里的加数	20234 + {25165} + 30760 = 76159	76159 – 20234 – 30760 = 25165
找出空格里的加数	28674 + {16821} + 28795 = 74290	74290 – 28674 – 28795 = 16821
找出空格里的加数	13457 + {39862} + 26718 = 80037	80037 – 13457 – 26718 = 39862

整数的加减混合运算 – 找空格里的数 – 1

by Ski Admin

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Question 1 of 10

1. Question
1 point(s)

找出空格里的数字

+ 6421 – 10792 = 17166

Correct 1 / 1 Points

Incorrect / 1 Points

Question 2 of 10

2. Question
1 point(s)

找出空格里的数字

38295 – 14923 + = 25591

Correct 1 / 1 Points

Incorrect / 1 Points

Question 3 of 10

3. Question
1 point(s)

找出空格里的数字

52983 + 2319 – = 26826

Correct 1 / 1 Points

Incorrect / 1 Points

Question 4 of 10

4. Question
1 point(s)

找出空格里的数字

63745 – 35427 + = 33961

Correct 1 / 1 Points

Incorrect / 1 Points

Question 5 of 10

5. Question
1 point(s)

找出空格里的数字

+ 7435 – 2103 = 21224

Correct 1 / 1 Points

Incorrect / 1 Points

Question 6 of 10

6. Question
1 point(s)

找出空格里的数字

48563 – + 10982 = 56800

Correct 1 / 1 Points

Incorrect / 1 Points

Question 7 of 10

7. Question
1 point(s)

找出空格里的数字

29587 + – 12345 = 20884

Correct 1 / 1 Points

Incorrect / 1 Points

Question 8 of 10

8. Question
1 point(s)

找出空格里的数字

– 2846 + 14322 = 59332

Correct 1 / 1 Points

Incorrect / 1 Points

Question 9 of 10

9. Question
1 point(s)

找出空格里的数字

39487 + 5213 – = 27136

Correct 1 / 1 Points

Incorrect / 1 Points

Question 10 of 10

10. Question
1 point(s)

找出空格里的数字

50976 – 19876 + = 34724

Correct 1 / 1 Points

Incorrect / 1 Points

Oxidation and Reduction in Term of Change of Oxidation Number

by Ski Admin

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Question 1 of 10

1. Question
1 point(s)

Find the oxidation number of sulphur in Na₂S₂O3.

+2

+3

+4

+6

Correct

Incorrect

Question 2 of 10

2. Question
1 point(s)

What is the oxidation number of sulphur in K₂SO₃?

+4

+6

+5

-2

Correct

Incorrect

Question 3 of 10

3. Question
1 point(s)

What is the oxidation number of vanadium in V₂O₅?

+5

-5

+4

-4

Correct

Incorrect

Question 4 of 10

4. Question
1 point(s)

What is the oxidation state of nitrogen in a nitric acid molecule?

+5

-5

+4

-4

Correct

Incorrect

Question 5 of 10

5. Question
1 point(s)

What is the oxidation state of phosphorus in a phosphoric acid molecule?

+5

-5

+4

-4

Correct

Incorrect

Question 6 of 10

6. Question
1 point(s)

What is the oxidation number of hydrogen in magnesium hydride, \(\mathrm{MgH}_2\) ?

0

+1

-1

+2

Correct

Incorrect

Question 7 of 10

7. Question
1 point(s)

Which of the underlined element in the following compounds has the highest oxidation number?

K₂Cr₂O₇

Fe₂(SO₄)₃

PbCl₄

KMnO₄

Correct

Incorrect

Question 8 of 10

8. Question
1 point(s)

Which of the following is true about the oxidation number of the elements in NH₄ClO₃.

I. Element : N
Oxidation Number: -3

II. Element : H
Oxidation Number: +4

III. Element: Cl
Oxidation Number: -1

IV. Element :O
Oxidation Number: -2

Correct

Incorrect

Question 9 of 10

9. Question
1 point(s)

What is the oxidation number of \(\mathrm{X}\) in \(\mathrm{XO}_4^{-}\)?

+4

+7

+5

+8

Correct

Incorrect

Question 10 of 10

10. Question
1 point(s)

What is the oxidation number of the chromium element in potassium dichromate(VI), \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) ?

+2

+3

+5

+6

Correct

Incorrect

Time limit: 0

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Question 1 of 7

1. Question
1 point(s)

The following ionic equation represents the reaction between acidified potassium dichromate(VI) solution and iron(II) sulphate solution.
\[
\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{Fe}^{2+} \rightarrow 6 \mathrm{Fe}^{3+}+2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O}
\]
What is the change of oxidation number of chromium in the reaction?

+6 to +2.

+6 to +3

+7 to +2

+7 to +3

Correct

Incorrect

Question 2 of 7

2. Question
1 point(s)

The following equation represents the oxidation reaction between ethanol and acidified potassium dichromate(VI).
\[
\begin{aligned}
& 3 \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}+2 \mathrm{~K}_2 \mathrm{Cr}_2 \mathrm{O}_7+8 \mathrm{H}_2 \mathrm{SO}_4 \rightarrow \\
& \quad 3 \mathrm{CH}_3 \mathrm{COOH}+2 \mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3+2 \mathrm{~K}_2 \mathrm{SO}_4+11 \mathrm{H}_2 \mathrm{O}
\end{aligned}
\]

What is the change in the oxidation number of the element chromium in this reaction?

+2 to +6

+6 to +2.

+3 to +6

+6 to +3

Correct

Incorrect

Question 3 of 7

3. Question
1 point(s)

Diagram 6 shows the chemical formula of a compound.

the IUPAC name and oxidation number of copper element in the compound?

\begin{align}
\begin{array}{|c|l|c|}
\hline & \text { Name of compound } & \begin{array}{l}
\text { Oxidation number of } \\
\text { copper element }
\end{array} \\
\hline \text { A } & \text { Copper(I) oxide } & +1 \\
\hline \text { B } & \text { Copper(I) oxide } & +2 \\
\hline \text { C } & \text { Copper(II) oxide } & +1 \\
\hline \text { D } & \text { Copper(II) oxide } & +2 \\
\hline
\end{array}
\end{align}

A

B

C

D

Correct

Incorrect

Question 4 of 7

4. Question
1 point(s)

The following chemical equation represents the extraction of silicon from quartz using coke.
\[
\mathrm{SiO}_2+\mathrm{C} \longrightarrow \mathrm{Si}+\mathrm{CO}_2
\]
What is the change in oxidation number of silicon?

+2 to 0

+4 to 0

0 to +2

0 to +4

Correct

Incorrect

Question 5 of 7

5. Question
1 point(s)

The following ionic equation shows the reaction between zinc and acid.
\[
\mathrm{Zn}(\mathrm{s})+2 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{H}_2(\mathrm{~g})
\]
What is the change in oxidation number of hydrogen?

0 to +1

0 to +2

+1 to 0

+1 to +2

Correct

Incorrect

Question 6 of 7

6. Question
1 point(s)

Which of the following IUPAC names are correct for the respective formulae of substances?

I. Fe(NO₃)₃
Iron(II) nitrate

II. Mn₂O₃
Manganese(III) oxide

III. CrO₃
Chromium(VI) oxide

IV. NaClO
Sodium chlorate(I)

Correct

Incorrect

Question 7 of 7

7. Question
1 point(s)

The equation below shows the decomposition of potassium chlorate.

2KClO₃ → 2KCl + 3O₂

Which of the following shows the change of oxidation number of chlorine in the reaction?

-1 to 0

0 to -1

+5 to -1

-1 to + 5

Correct

Incorrect

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Question 1 of 9

1. Question
1 point(s)

The equation represents the redox reaction between ammonia and copper(II) oxide.

2NH₃ + 3CuO → N₂ + 3Cu + 3H₂O

Which of the following is true about the reaction?

I. Ammonia is a reducing agent

II. Nitrogen is a reducing agent

III. Oxidation number of copper decreases from +2 to 0

IV. Oxidation number of nitrogen increases from -3 to 0

Correct

Incorrect

Question 2 of 9

2. Question
1 point(s)

The oxidation number of calcium increases when

calcium carbonate is heated

calcium carbonate reacts with dilute sulphuric acid

calcium oxide is heated with aluminium powder.

calcium reacts with hydrochloric acid.

Correct

Incorrect

Question 3 of 9

3. Question
1 point(s)

Which of the underlined substances in the following equations undergo oxidation?

I. HCl + NaOH → NaCl + H₂O

II. Zn + H₂SO₄ → ZnSO₄ + H₂

III. CuSO₄ + Ba(NO₃)₂ → Cu(NO₃)₂ + BaSO₄

IV. Mg + CuSO₄ → MgSO₄ + Cu

Correct

Incorrect

Question 4 of 9

4. Question
1 point(s)

Which of the following statements about a chemical reaction are true?

I. If the oxidation state of an element in a reactant increase, the reactant is oxidised.

II. This is a redox reaction if there are changes in the oxidation state of the reactants.

III. A reactant is a reducing agent if its oxidising state decreases.

IV. The reactant being reduced will act as the oxidising agent.

Correct

Incorrect

Question 5 of 9

5. Question
1 point(s)

A substance undergoes oxidation if

I. The substance gains oxygen atoms from another reactant.

II. The substance gains hydrogen from another reactant.

The substance receives electrons from another reactant.

IV. The oxidation number of the substance increases.

Correct

Incorrect

Question 6 of 9

6. Question
1 point(s)

Which of the following indicates that a substance undergoes reduction?

I. The substance gains oxygen atoms from another reactant.

II. The substance gains hydrogen from another reactant.

III. The substance receives electrons from another reactant.

IV. The oxidation number of the substance increases.

Correct

Incorrect

Question 7 of 9

7. Question
1 point(s)

Which of the following is NOT true about oxidation and reduction?

Oxidation: Receiving oxygen, Reduction: Loss of oxygen

Oxidation: Loss of hydrogen, Reduction: Gaining hydrogen

Oxidation: Gaining electrons, Reduction: Loss of electrons

Oxidation: Increase in oxidation number, Reduction: Decrease in oxidation number

Correct

Incorrect

Question 8 of 9

8. Question
1 point(s)

Which of the underlined substances in the following equations undergo oxidation?

I. NaOH + HCl → NaCl + H₂O

II. Pb(NO₃)₂ + 2KCl → PbCl₂ + 2KNO₃

III. Mg + CuSO₄ → MgSO₄ + Cu

IV. 2K + Br₂ → 2KBr

Correct

Incorrect

Question 9 of 9

9. Question
1 point(s)

The half equation represents the reduction reaction of acidified potassium dichromate(VI) solution.
\[
\mathrm{Cr}_2 \mathrm{O}_7^{2-}+\mathrm{xH}^{+}+\mathrm{ye}^{-} \longrightarrow \mathrm{zCr}^{3+}+7 \mathrm{H}_2 \mathrm{O}
\]
What are the value of \(x, y\) and \(z\) ?

\begin{align}
\begin{array}{|c|c|c|c|}
\hline & x & y & z \\
\hline \text { A } & 14 & 6 & 2 \\
\hline \text { B } & 14 & 5 & 1 \\
\hline \text { C } & 7 & 2 & 1 \\
\hline \text { D } & 7 & 1 & 2 \\
\hline
\end{array}
\end{align}

A

B

C

D

Correct

Incorrect

Redox Reaction

by Ski Admin

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Question 1 of 7

1. Question
1 point(s)

Reducing agents are ____1____ in a reaction.

Reducing agents cause the other substance in the reaction to ____2____ oxygen.

Which words complete gaps 1 and 2?

1. reduced | 2. receive

1. reduced | 2. donate

1. oxidised | 2. receive

1. oxidised | 2. donate

Correct

Incorrect

Question 2 of 7

2. Question
1 point(s)

Magnesium reacts with copper oxide. The equation for this reaction is shown.

Mg+CuO→MgO+Cu

Which substance is acting as an oxidising agent in this reaction?

Cu

CuO

Mg

MgO

Correct

Incorrect

Question 3 of 7

3. Question
1 point(s)

Iron is extracted from its oxide using carbon monoxide. The equation is shown.

Fe₂O₃+3CO→2Fe+3CO₂

Which row identifies the reducing agent and explains how it acts as a reducing agent?

Reducing agent How it reacts

A Fe₂O₃ receives oxygen

B Fe₂O₃ donates oxygen

C CO receives oxygen

D CO donates oxygen

A

B

C

D

Correct

Incorrect

Question 4 of 7

4. Question
1 point(s)

Iron can be obtained from iron(III) oxide by heating with aluminium powder. The equation is shown.

2Al+Fe₂O₃→Al₂O₃+2Fe

What is the oxidising agent?

Al

Fe₂O₃

Al₂O₃

Fe

Correct

Incorrect

Question 5 of 7

5. Question
1 point(s)

The equation for the reaction of zinc oxide with carbon monoxide is shown.

ZnO+CO→Zn+CO₂

Which statement explains the role of carbon monoxide in this reaction?

It is the oxidising agent and it is oxidised.

It is the oxidising agent and it is reduced.

It is the reducing agent and it is oxidised.

It is the reducing agent and it is reduced.

Correct

Incorrect

Question 6 of 7

6. Question
1 point(s)

Iron oxide reacts with aluminium.

Fe₂O₃+2Al→2Fe+Al₂O₃

Which row identifies the oxidising agent and reducing agent in the reaction?

Oxidising agent: Fe₂O₃ | Reducing agent: Al

Oxidising agent: Al | Reducing agent: Fe₂O₃

Oxidising agent: | Reducing agent: Al₂O₃

Oxidising agent: Al₂O₃ | Reducing agent: Fe

Correct

Incorrect

Question 7 of 7

7. Question
1 point(s)

2 NH₃ + 3CuO → N₂ + 3Cu + 3H₂O

The equation above represents the reaction between ammonia and copper(II) oxide. Which of the following is true about the reaction?

I. Ammonia is oxidized.

II. Copper (II) oxide is reduced.

III. Ammonia acts as an oxidising agent.

IV. Copper (II) oxide is the oxidising agent in the reaction.

Correct

Incorrect

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Question 1 of 9

1. Question
1 point(s)

Which of the following equation shows that a chlorine molecule receives 2 electrons to form 2 chloride ions?

Cl₂ + 2e → 2Cl⁻

Cl₂ → 2Cl⁻ + 2e

2Cl⁻ + 2e → Cl₂

2Cl⁻ → Cl₂ + 2e

Correct

Incorrect

Question 2 of 9

2. Question
1 point(s)

Which of the following equation shows that a copper(II) ion receive 2 electrons to form
copper atom?

Cu + 2e → Cu²⁺

Cu → Cu²⁺ + 2e

Cu²⁺ + 2e → Cu

Cu²⁺ → Cu + 2e

Correct

Incorrect

Question 3 of 9

3. Question
1 point(s)

Which of the following equation shows that a zinc atom donates 2 electrons to form a zinc ion?

Zn + 2e → Zn²⁺

Zn → Zn²⁺ + 2e

Zn²⁺ + 2e → Zn

Zn²⁺ → Zn + 2e

Correct

Incorrect

Question 4 of 9

4. Question
1 point(s)

The following equation represents the oxidation of magnesium atom.

Mg → Mg²⁺ + 2e-

What is meant by oxidation based on the equation?

Electrons received by magnesium ions

Electrons are released by magnesium ions

Electrons received by magnesium atoms

Electrons are released by magnesium atoms

Correct

Incorrect

Question 5 of 9

5. Question
1 point(s)

Which of the following is a reduction reaction?

Carbon gains oxygen.

Zinc atom loses electrons.

Hydrogen sulfide loses hydrogen.

Bromine molecule gains electron.

Correct

Incorrect

Question 6 of 9

6. Question
1 point(s)

Which half equations show that reactant acts as a reducing agent?

I. \(\mathrm{Mg} \longrightarrow \mathrm{Mg}^{2+}+2 \mathrm{e}^{-}\)
II. \(\mathrm{Cu}^{2+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Cu}\)
III. \(2 \mathrm{Cl}^{-} \longrightarrow \mathrm{Cl}_2+2 \mathrm{e}^{-}\)
IV. \(2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_2\)

I and II

I and III

II and IV

III and IV

Correct

Incorrect

Question 7 of 9

7. Question
1 point(s)

The reaction between iron(II) sulphate solution and bromine can be represented by the
following equation.

Fe²⁺ + Cl₂ → Fe³⁺ + 2Cl⁻

Which of the following is true about the reaction?

Fe²⁺ is reduced

Cl₂ is a reducing agent

Fe²⁺ is an oxidizing agent

Cl₂ receives electrons

Correct

Incorrect

Question 8 of 9

8. Question
1 point(s)

Which of the followings are reducing process?

I. Ethene changes into ethane

II. Copper(II) oxide loses its oxygen

III. Bromin molecule gains electrons.

IV. Tin (IV) ion become to tin(II) ion

Correct

Incorrect

Question 9 of 9

9. Question
1 point(s)

Which set of definition of oxidation in terms of oxygen, hydrogen and electron is correct?

\[
\begin{array}{|l|l|l|l|}
\hline & \text { Oxygen } & \text { Hydrogen } & \text { Electrons } \\
\hline \text { A } & \text { Gain } & \text { Loss } & \text { Loss } \\
\hline \text { B } & \text { Gain } & \text { Loss } & \text { Gain } \\
\hline \text { C } & \text { Loss } & \text { Gain } & \text { Gain } \\
\hline \text { D } & \text { Loss } & \text { Gain } & \text { Loss } \\
\hline
\end{array}
\]

A

B

C

D

Correct

Incorrect

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Question 1 of 10

1. Question
1 point(s)

Find the oxidation number of sulphur in Na₂S₂O3.

+2

+3

+4

+6

Correct

Incorrect

Question 2 of 10

2. Question
1 point(s)

What is the oxidation number of sulphur in K₂SO₃?

+4

+6

+5

-2

Correct

Incorrect

Question 3 of 10

3. Question
1 point(s)

What is the oxidation number of vanadium in V₂O₅?

+5

-5

+4

-4

Correct

Incorrect

Question 4 of 10

4. Question
1 point(s)

What is the oxidation state of nitrogen in a nitric acid molecule?

+5

-5

+4

-4

Correct

Incorrect

Question 5 of 10

5. Question
1 point(s)

What is the oxidation state of phosphorus in a phosphoric acid molecule?

+5

-5

+4

-4

Correct

Incorrect

Question 6 of 10

6. Question
1 point(s)

What is the oxidation number of hydrogen in magnesium hydride, \(\mathrm{MgH}_2\) ?

0

+1

-1

+2

Correct

Incorrect

Question 7 of 10

7. Question
1 point(s)

Which of the underlined element in the following compounds has the highest oxidation number?

K₂Cr₂O₇

Fe₂(SO₄)₃

PbCl₄

KMnO₄

Correct

Incorrect

Question 8 of 10

8. Question
1 point(s)

Which of the following is true about the oxidation number of the elements in NH₄ClO₃.

I. Element : N
Oxidation Number: -3

II. Element : H
Oxidation Number: +4

III. Element: Cl
Oxidation Number: -1

IV. Element :O
Oxidation Number: -2

Correct

Incorrect

Question 9 of 10

9. Question
1 point(s)

What is the oxidation number of \(\mathrm{X}\) in \(\mathrm{XO}_4^{-}\)?

+4

+7

+5

+8

Correct

Incorrect

Question 10 of 10

10. Question
1 point(s)

What is the oxidation number of the chromium element in potassium dichromate(VI), \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) ?

+2

+3

+5

+6

Correct

Incorrect

Composite Material

by Ski Admin

Glass and Ceramics

by Ski Admin

Time limit: 0

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Question 1 of 9

1. Question
1 point(s)

CHEM0905010
Which of the following glass is normally used to make windows, mirrors and bottles?

Fused silica glass

Borosilicate glass

Soda-lime glass

Lead glass

Correct

Incorrect

Question 2 of 9

2. Question
1 point(s)

CHEM0905020
Which of the following are the characteristics of ceramic?

I. Hard

II. Brittle

III. Low melting point

IV. Good electrical insulator

Correct

Incorrect

Question 3 of 9

3. Question
1 point(s)

CHEM0905030
Which of the following are the common properties of glass and ceramic?

I. Chemical inactive

II. Poor conductor of electricity.

III. Hard and brittle.

IV. Low melting point.

Correct

Incorrect

Question 4 of 9

4. Question
1 point(s)

CHEM0905040
What type of glass is formed when calcium carbonate is heated with silicon dioxide?

Fused glass

Borosilicate glass

Soda lime glass

Lead crystal glass

Correct

Incorrect

Question 5 of 9

5. Question
1 point(s)

CHEM0905050
Ceramic is used as the wall of nuclear reactors because

it is very hard

it is inert towards chemical reaction

it can withstand high temperature

it can block radioactive radiation

Correct

Incorrect

Question 6 of 9

6. Question
1 point(s)

CHEM0905060
Substance Y has the following properties.

Low coefficient of thermal expansion.
Very high resistance to chemical substances.

What is substance Y?

Borosilicate glass

Photochromic glass

Brass

Stainless steel

Correct

Incorrect

Question 7 of 9

7. Question
1 point(s)

CHEM0905070
A substance X is added to soda lime glass in the manufacturing process so that the glass is more resistance to heat. What is X?

Boron oxide

Lead(II) oxide

Sodium carbonate

Lead(II) carbonate

Correct

Incorrect

Question 8 of 9

8. Question
1 point(s)

CHEM0905080

The image above shows some electric cables supported by some insulator. The insulator is most probably made up of

ceramic

concrete

lead Glass

carbon fibre

Correct

Incorrect

Question 9 of 9

9. Question
1 point(s)

CHEM0905100
Which of the following glass is resistance to heat, transparent to infrared but not transparent to UV light?

Borosilicate glass

Lead glass

Fused silica glass

Soda-lime glass

Correct

Incorrect

Latihan

by Ski Admin

Time limit: 0

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Question 1 of 11

1. Question
1 point(s)

CHEM0404010

Manakah halogen berikut wujud sebagai cecair merah jambu pada suhu bilik?

Klorin

Iodin

Fluorin

Bromin

Correct

Incorrect

Question 2 of 11

2. Question
1 point(s)

CHEM0404020

Antara berikut yang manakah paling reaktif secara kimia dalam kumpulan halogen?

Fluorin

Klorin

Bromin

Iodin

Correct

Incorrect

Question 3 of 11

3. Question
1 point(s)

CHEM0404030

Manakah antara pernyataan berikut BENAR tentang unsur Kumpulan 17?

mereka adalah bahan yang kuat apabila pepejal.

mereka mempunyai takat didih yang tinggi.

mereka berwarna apabila dalam keadaan gas.

mereka adalah pengkonduktor elektrik yang baik.

Correct

Incorrect

Question 4 of 11

4. Question
1 point(s)

CHEM0404040

Manakah antara pernyataan berikut adalah BENAR tentang unsur Kumpulan 17?

I. Mereka dipanggil halogen.

II. Fluorin dan bromin larut dalam air untuk membentuk larutan asid.

III. Semua unsur Kumpulan 17 larut dalam air.

IV. Semua unsur Kumpulan 17 boleh bertindak balas dengan natrium hidroksida untuk membentuk garam.

Correct

Incorrect

Question 5 of 11

5. Question
1 point(s)

CHEM0404050

Antara berikut, yang manakah betul tentang ciri-ciri unsur dalam Kumpulan 17 dalam jadual berkala apabila menuruni kumpulan?

I. Saiz atom berkurang apabila turun kumpulan.

II. Takat didih unsur meningkat apabila turun kumpulan.

III. Warna unsur menjadi lebih gelap apabila turun kumpulan.

IV. Kereaktifan unsur berkurang apabila turun kumpulan.

Correct

Incorrect

Question 6 of 11

6. Question
1 point(s)

CHEM0404060

Klorin dan bromin adalah unsur dalam Kumpulan 17 dalam jadual berkala. Takat didih klorin lebih rendah daripada bromin. Pernyataan yang manakah di bawah ini menerangkan fenomena ini?

Jisim atom relatif klorin lebih rendah daripada bromin.

Bilangan elektron dalam atom klorin lebih rendah daripada bromin.

Jejari atom klorin lebih kecil daripada bromin.

Elektronegativiti klorin lebih tinggi daripada bromin.

Correct

Incorrect

Question 7 of 11

7. Question
1 point(s)

CHEM0404070

Unsur X terletak dalam kumpulan yang sama dengan bromin dalam jadual berkala unsur. Manakah antara berikut yang benar tentang unsur X?

I. Ia membentuk ion dengan cas -1.

II. Ia wujud sebagai unsur monoatomik dalam alam.

III. Ia mempunyai 7 elektronvalens.

IV. Ia membentuk larutan asid apabila larut dalam air.

Correct

Incorrect

Question 8 of 11

8. Question
1 point(s)

CHEM0404080

Unsur P larut dalam air untuk menghasilkan larutan asid. Larutan ini boleh mengubah kertas litmus menjadi tidak berwarna. Apakah unsur yang paling mungkin menjadi P?

Nitrogen

Klorin

Natrium

Fosforus

Correct

Incorrect

Question 9 of 11

9. Question
1 point(s)

CHEM0404090

Apakah hasil yang terbentuk apabila bromin bertindak balas dengan natrium hidroksida?

I. H₂O

II. NaBr

III. O₂

IV. NaOBr

Correct

Incorrect

Question 10 of 11

10. Question
1 point(s)

CHEM0404100

Apakah hasil yang terbentuk apabila gas klorin larut dalam air?

I. Asid hidroklorik

II. Hidrogen klorida

III. Asid hipoklorus

IV. Asid hiperklorik

Correct

Incorrect

Question 11 of 11

11. Question
1 point(s)

CHEM0404110

Apakah kegunaan-kegunaan klorin berikut?

I. Sebagai antioksidan

II. Sebagai ejen pemutihan

III. Untuk membunuh mikroorganisma dalam air

IV. Untuk menghasilkan disenfektan rumah tangga

Correct

Incorrect

Practice

by Ski Admin

Time limit: 0

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Question 1 of 11

1. Question
1 point(s)

CHEM0404010
Which of the halogens exist as a reddish-brown liquid at room temperature?

Chlorine

Iodine

Fluorine

Bromine

Correct

Incorrect

Question 2 of 11

2. Question
1 point(s)

CHEM0404020
Which of the following is chemically most reactive among halogens?

Fluorine

Chlorine

Bromine

Iodine

Correct

Incorrect

Question 3 of 11

3. Question
1 point(s)

CHEM0404030
Which of the following statements is TRUE about the Group 17 elements?

they are strong materials when in solid.

they have high boiling points.

they are coloured when in the gaseous state.

they are good conductors of electricity.

Correct

Incorrect

Question 4 of 11

4. Question
1 point(s)

CHEM0404040
Which of the following statement is TRUE about group 17 elements.

I. They are called the halogen.

II. Fluorine and bromine dissolve in water to form acidic solution.

III. All group 17 elements are soluble in water.

IV. All group 17 elements can react with sodium hydroxide to form salt.

Correct

Incorrect

Question 5 of 11

5. Question
1 point(s)

CHEM0404050
Which of the following is correct about the characteristic of elements in group 17 in the periodic table as going down the group?

I. The size of the atom decreases down the group.

II. The boiling point of the elements increases down the group.

III. The colour of the elements become darker down the group.

IV. The reactivity of the elements decreases down the group.

Correct

Incorrect

Question 6 of 11

6. Question
1 point(s)

CHEM0404060
Both chlorine and bromine are elements in group 17 in the periodic table. The boiling point of chlorine is lower than bromine. Which statement below explains this phenomena?

The relative atomic mass of chlorine is less than that of bromine.

The proton number of chlorine is less than that of bromine.

The atomic radius of chlorine is less than that of bromine.

The electronegativity of chlorine is higher than that of bromine.

Correct

Incorrect

Question 7 of 11

7. Question
1 point(s)

CHEM0404070
Element X is located in the same group as bromine in the periodic table of elements. Which of the following is true about element X?

I. It forms ions with charge -1.

II. It exist as monoatomic element in nature

III. It has 7 valence electrons.

IV. It forms acidic solutions when react with water.

Correct

Incorrect

Question 8 of 11

8. Question
1 point(s)

CHEM0404080
Element P dissolve in water to produce an acidic solution. The solution can turn litmus paper colourless. Which of the following is most likely to be P?

Nitrogen

Chlorine

Sodium

Phosphorus

Correct

Incorrect

Question 9 of 11

9. Question
1 point(s)

CHEM0404090
Which of the following is the product formed when bromine reacts with sodium hydroxide?

I. H₂O

II. NaBr

III. O₂

IV. NaOBr

Correct

Incorrect

Question 10 of 11

10. Question
1 point(s)

CHEM0404100
Which of the following is the product formed when chlorine gas dissolves in water?

I. Hydrochloric acid

II. Hydrogen chloride

III. Hypochlorus acid

IV. Hyperchloric acid

Correct

Incorrect

Question 11 of 11

11. Question
1 point(s)

CHEM0404110
Which of the following are the uses of chlorine?

I. As antioxidant

II. As bleaching agent

III. To kill microorganism in water

IV. To manufacture household disinfectants

Correct

Incorrect