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Science
8th
grade
Exploring Diversity of Matter by its Chemical Composition
15 questions
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- 1. Multiple Choice
Which set contains only compounds?
sodium chloride, water, carbon dioxide
oxygen, nitrogen, water vapour
air, crude oil, bronze
oxygen, sodium chloride, seawater
- 2. Multiple Choice
Which pair of elements have the same chemical properties?
P and Q
Q and T
R and S
S and T
- 3. Multiple Choice
Elements in the same row are in the same period. They change from metallic properties (left) to non-metallic properties (right).
True
False
- 4. Multiple Choice
_____________ or ______________ is usually given out or taken in when compounds are formed.
Water
Light
Heat
Gas
- 5. Multiple Choice
A suspension is a mixture in which __________________ substances are suspended in a liquid or gas.
transparent
soluble
translucent
insoluble
- 6. Multiple Choice
The following factors affects the rate of dissolving:
Surface area/ particle size
Type of beaker
Rate of stirring
Temperature
- 7. Multiple Choice
Which factor does not affect the solubility of a substance?
Temperature
Type of solute
Type of solvent
Surface area/ particle size
- 8. Multiple Choice
Which of the following statements about the Periodic Table is correct?
Elements are arranged according to their chemical symbols.
Metals are found on the right-hand side.
The zigzag line divides the elements into metals and non-metals.
There are more non-metals than metals.
- 9. Multiple Choice
Substance X is added to distilled water, stirred and then filtered. A black solid is obtained as the residue and a blue solution is obtained as the filtrate.
Using the observations, which of the statements is correct?
The black solid is an element.
The blue solution is a compound.
Substance X is a compound.
Substance X is a mixture.
- 10. Multiple Choice
Which best describes the picture shown?
element
compound
mixture of elements and compounds
mixture of compounds
- 11. Multiple Choice
Which best describes the picture shown?
element
compound
mixture of elements
mixture of compounds and elements
- 12. Multiple Choice
Which best describes the picture shown?
element
compound
mixture of elements
mixture of compounds
- 13. Multiple Choice
Which best describes the picture shown?
element
compound
mixture of elements and compounds
mixture of compounds
- 14. Multiple ChoiceJay combines water, sugar, and lemon juice to form lemonade. What type of substance was made?ElementCompoundMixture
- 15. Multiple Choice
The rate of dissolving of a solute refers to ________________.
how much a solute dissolves in a fixed volume of solvent
how much a solute dissolves in any volume of solvent
how fast a solute dissolves in a fixed volume of solvent
how fast a solute dissolves in any volume of solvent
- Answer choicesTagsAnswer choicesTags