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WorksheetsChemistry Test 1
Total questions: 25
Worksheet time: 35mins
Name
Class
Date
1.
Which of the following statements about chemical changes is correct?
a)
Chemical changes can be easily reversed.
b)
Chemical changes only occur in gases.
c)
Chemical changes do not affect the mass of substances.
d)
Chemical changes result in the formation of new substances.
2.
Which of the following best describes a physical change?
a)
The mass of the substance increases.
b)
A new substance is formed.
c)
The chemical identity of a substance changes.
d)
The form of a substance changes, but its identity remains the same.
3.
What happens to the identity of a substance during a physical change?
a)
It is altered temporarily.
b)
It becomes unrecognizable.
c)
It remains the same.
d)
It changes completely.
4.
Which of the following statements accurately describes a physical change?
a)
The chemical identity of the substance changes.
b)
The substance undergoes a change in form, but its identity remains the same.
c)
A new substance is created during the process.
d)
The mass of the substance decreases.
5.
What does the law of conservation of matter state?
a)
Matter cannot be created or destroyed.
b)
Matter can be created or destroyed.
c)
Matter is always conserved in chemical reactions only.
d)
Matter can change forms but not identity.
6.
Which of the following is an example of a chemical change?
a)
Density
b)
Boiling point
c)
Burning wood
d)
Melting point
7.
Which of the following statements is true regarding chemical properties?
a)
They require a chemical reaction to be determined.
b)
They can be observed without changing the substance.
c)
They are not useful in identifying substances.
d)
They are the same as physical properties.
8.
What distinguishes an extensive property from an intensive property?
a)
Intensive properties depend on the amount of substance present.
b)
Extensive properties depend on the amount of substance present.
c)
Intensive properties are always measurable.
d)
Extensive properties depend on the type of substance.
9.
Which of the following is true about heterogeneous mixtures?
a)
They have a uniform composition throughout.
b)
They can be separated into their components easily.
c)
They are always made of two or more elements.
d)
They do not retain the identities of their components.
10.
Which of the following mixtures is an example of a homogeneous mixture?
a)
A salad
b)
Sand and salt
c)
Oil and water
d)
Sugar water
11.
Which of the following best describes a homogeneous mixture?
a)
It has distinct layers.
b)
It has a uniform composition throughout.
c)
It can be easily separated by physical means.
d)
It contains multiple phases.
12.
What role do models play in scientific understanding?
a)
Models represent theories that cannot be tested.
b)
Models are always accurate representations of reality.
c)
Models are only used for physical objects.
d)
Models help visualize and explain complex concepts.
13.
Which of the following is a characteristic of a pure substance?
a)
It is always a solid.
b)
It can vary in properties.
c)
It has a fixed composition.
d)
It can be a mixture of different compounds.
14.
How does a pure substance differ from a mixture?
a)
A pure substance is always heterogeneous.
b)
A pure substance is made up of multiple elements.
c)
A pure substance is made up of a single element or compound.
d)
A pure substance can be separated into its components.
15.
What does the atomic number of an atom represent?
a)
The total number of particles in the nucleus.
b)
The mass of the atom.
c)
The number of protons in an atom's nucleus.
d)
The number of neutrons in an atom's nucleus.
16.
What is an element of the alkali metals in the periodic table and a characteristic of the group?
4 lines
17.
What is an element of the alkaline earth metals in the periodic table and a characteristic of the group?
4 lines
18.
What is an element of the transition metals in the periodic table and a characteristic of the group?
4 lines
19.
What is an element of the post-transition metals in the periodic table and a characteristic of the group?
4 lines
20.
What is an element of the metalloids in the periodic table and a characteristic of the group?
4 lines
21.
What is an element of the reactive non-metals in the periodic table and a characteristic of the group?
4 lines
22.
What is an element of the noble gases in the periodic table and a characteristic of the group?
4 lines
23.
Flammability of a substance is a (a)
Choose from the below words
Chemical Property
Physical Property
Solution
24.
Select the images where it shows a physical change.
A
B
C
D
E
F
25.
Bonus: Draw an atom.
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