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G 10 Chemistry Test 1

By Mumba / April 12, 2020

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Question 1 of 30

1. Question
An ion X⁺ has 23 nucleons and 10 electrons. What does the nucleus of the ion X⁺contain?
- A
- B
- C
- D
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Question 2 of 30

2. Question
An atom of an element contains 17 protons, 18 neutrons and 17 electrons. What is the atomic structure of another isotope of this element?
- A
- B
- C
- D
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Question 3 of 30

3. Question
Which of the following is the best method of obtaining pure water from ink?
- Chromatography
- Filtration
- Distillation
- Freezing
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Question 4 of 30

4. Question
Which of the following is not a unit of matter?
- Solid
- Atom
- Molecule
- Ion
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Question 5 of 30

5. Question
Which substance in the table is an ionic compound?
- A
- B
- C
- D
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Question 6 of 30

6. Question
What do both an atom and an ion of the isotope of sodium , ²³₁₁Na contain?
- 11 electrons
- 12 neutrons
- 23 protons
- 11 protons
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Question 7 of 30

7. Question
By which process does the smell of cooking spread to all rooms in a house?
- Decomposition
- Effusion
- Diffusion
- Spreading
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Question 8 of 30

8. Question
Trichloroethane is a solvent used to remove grease from clothing. How, after use , is the solvent separated from the grease?
- By chromatography
- By diffusion
- By distillation
- By filtration
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Question 9 of 30

9. Question
In which pair of substances is each substance a mixture?
- Air; water
- Limewater; water
- Quicklime; limewater
- Seawater; air
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Question 10 of 30

10. Question
Elements X and Y react to form an ionic compound of formula XY. What could be the proton(atomic) numbers of X and Y?
- A
- B
- C
- D
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Question 11 of 30

11. Question
Which statement about an atom is true?
- All the elements have only one nucleon number
- The nucleon number can be less than the proton number
- The nucleon number can equal the proton number
- The number of neutrons never equals the number of electrons
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Question 12 of 30

12. Question
Which element reacts with oxygen to form a compound that is a gas at room temperature?
- Magnesium
- Hydrogen
- Copper
- Carbon
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Question 13 of 30

13. Question
What can be deduced about two gases that have the same molecular mass?
- They have the same solubility in water at room temperature
- They have the same boiling point
- They have the same number of atoms in one molecule
- They have the same rate of diffusion at room temperature and pressure
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Question 14 of 30

14. Question
Which of the following correctly describes the particles in a dilute sugar solution at room temperature?
- A
- B
- C
- D
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Question 15 of 30

15. Question
The table shows the melting and boiling points of four pure substances. At room temperature, which substance is a liquid and rapidly evaporates if left exposed to air?
- A
- B
- C
- D
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Question 16 of 30

16. Question
Metals are good conductors of electricity because they have mobile …
- Protons
- Electrons
- Ions
- Neutrons
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Question 17 of 30

17. Question
Which compound has both ionic and covalent bonds?
- Carbon dioxide
- Ammonium chloride
- Ethyl ethanoate
- Sodium chloride
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Question 18 of 30

18. Question
What is the definition of nucleon (mass) number?
- The mass in grams of an atom
- The number of electrons in an atom
- The number of nuclei in a molecule
- The total number of protons and neutrons in an atom
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Question 19 of 30

19. Question
Which property of a substance can be used to check its purity before it can be used as a food flavouring ?
- Boiling point
- Colour
- Smell
- Solubility in water
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Question 20 of 30

20. Question
Element X has an electronic configuration 2,8,8,1. Element Y has an electronic configuration 2,8,6. What is made when X and Y react?
- A
- B
- C
- D
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Question 21 of 30

21. Question
Which statement about a new element , which has seven outer electrons in its atoms , is correct?
- It is monatomic
- It forms a covalent compound with hydrogen
- It forms a positive ion
- It forms covalent compounds with Group I elements
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Question 22 of 30

22. Question
The ion Q²⁺has three complete shells of electrons. What is Q?
- Calcium
- Magnesium
- Oxygen
- Sulphur
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Question 23 of 30

23. Question
Which statement about both chlorine atoms and chloride ions is correct?
- They are chemically identical
- They are isotopes of chlorine
- They have the same number of protons
- They have the same physical properties
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Question 24 of 30

24. Question
Compounds are different from mixtures because…
- Each substance in a compound maintains its own properties
- Each original substance in a compound remains chemically unchanged
- Mixtures are held together by chemical bonds
- Compounds are held together by chemical bonds
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Question 25 of 30

25. Question
Which substance will diffuse most quickly?
- Carbon dioxide at 0°C
- Carbon dioxide at 25°C
- Neon at 0°C
- Neon at 25°C
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Question 26 of 30

26. Question
Which statement is correct?
- All compounds are ionic
- Each element only contains one type of atom
- All compounds conduct electricity when molten
- In a mixture of substances , the proportions of the substances are always the same
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Question 27 of 30

27. Question
Which two substances are elements with a giant molecular structure?
- Diamond and sand
- Diamond and graphite
- Methane and iodine
- Methane and sand
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Question 28 of 30

28. Question
Which of the following element does not have neutrons in most of its atoms?
- Sodium
- Sulphur
- Hydrogen
- Oxygen
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Question 29 of 30

29. Question
Which of the following is not true about isotopes?
- They are different atoms of an element
- They have the same chemical properties
- They have the same number of protons
- They have the same number of neutrons
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Question 30 of 30

30. Question
In a neutral atom, the number of protons in the nucleus equals the number of…
- Neutrons in the nucleus
- Electrons in the innermost shell
- Nucleons in the nucleus
- Electrons in the shells
Correct

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