23.01.2025, 10:56
Elements, compounds, mixtures. | Blooket
Blooket | Question Set
Name
Date
Class
Elements, compounds, mixtures.
1. Which of the following is an element?
a) Water
b) Carbon dioxide
c) Iron
d) Sugar
2. Which of the following statements is true for compounds?
a)
Compounds contain only one type of
atom.
Compounds always have a variable
c)
composition.
b)
Compounds can be separated by
physical methods.
Compounds are formed by the
d) chemical combination of two or more
elements.
3. Which of the following substances is a mixture?
a) Table salt (NaCl)
b) Water
c) Air
d) Methane (CH₄)
4. Which of the following is NOT a property of compounds?
Compounds can be separated by
physical methods.
a) Compounds have a fixed composition.
b)
Compounds can be broken down into
c)
elements only by chemical methods.
Compounds have new properties,
d) different from the properties of the
elements.
5. How are compounds formed?
By a chemical reaction between two
or more elements.
a) By mixing elements.
b)
c) By cooling elements.
d) By separating mixtures.
6. Which of the following is a compound?
a) Sodium oxide
b) Air
c) Copper
d) Iron filings
7. Which of the following substances is a mixture?
a) Copper
b) Water
c) Steel alloy
d) Aluminum dioxide
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23.01.2025, 10:56
Elements, compounds, mixtures. | Blooket
8. Which characteristic distinguishes a mixture from a compound?
a)
A mixture always has a fixed
composition.
b)
A mixture undergoes a chemical
reaction.
c)
Components of a mixture can be
separated by physical methods.
d)
A mixture has new properties different
from its components.
9. Which of the following statements is true for elements?
a)
Elements can be broken down into
simpler substances.
b)
Elements contain atoms of only one
type.
c)
Elements can be separated by physical
methods.
d)
Elements are formed during chemical
reactions.
10. Which of the following is a property of compounds?
a)
Compounds can be separated by
filtration.
b)
Compounds have a variable
composition.
c)
Compounds are formed by chemical
reactions.
d)
Compounds retain the same
properties as their elements.
11. Which of the following is an element?
a) Helium
b) Salt
c) Water
d) Ammonia (NH₃)
12. Which of the following represents a chemical compound?
a) Copper wire
b) Foil
c) Iron and sulfur mixed together
d) Water
13. Which statement is true for mixtures?
a)
Substances in mixtures retain their
properties.
b)
Substances in mixtures can be
separated by physical methods.
c)
Substances in mixtures are chemically
combined.
d)
Mixtures always have a fixed
composition.
14. How do the properties of elements change when they form a compound?
a)
They remain the same as in the
original elements.
c) They disappear completely.
b)
They change and acquire new
properties.
d) They always become less stable.
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23.01.2025, 10:56
Elements, compounds, mixtures. | Blooket
15. Which of the following is a characteristic property of a compound?
Its components are physically
combined.
b)
Its components can be separated by
filtration.
c) It always has a fixed composition.
d)
Its components can be seen with the
naked eye.
a)
16. Why is a mixture easier to separate than a compound?
a) Mixtures involve chemical bonding.
c)
Components of mixtures are physically
combined and retain their properties.
b) Mixtures have a fixed composition.
d) Compounds cannot be separated.
17. What is an element?
a)
A substance that consists of only one
type of atom.
b)
A substance that contains two or more
different atoms bonded together.
c)
A combination of substances that can
be separated physically.
d)
A compound that contains a metal and
a non-metal.
b)
A chemical combination of two or
more elements.
18. What is a mixture?
a)
A substance that cannot be separated
physically.
c) A substance with a fixed composition.
A physical combination of two or more
d) substances that retain their individual
properties.
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