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SCIENCE Practice TEST Chapter 2
Relax! Take a deep breath! Count backwards from 10! Now take your quiz!
1.
Which process occurs when a gas changes to a liquid? a) condensation b) evaporation c) freezing d) melting
2.
Which process occurs when a liquid changes to a gas? a.
condensation b.
evaporation c.
freezing d.
melting
3.
Which of the following describes what happens during a chemical reaction between two compounds? a) Some atoms are lost during the reaction b) Atoms in the reactants rearrange to form particles with different properties.

c) A solid dissolves in a liquid d) New atoms form during the reaction.
4.
What is the temperature at which a liquid turns into a solid? a) Boiling temperature b) Freezing temperature c) Sublimation temperature d) Evaporation temperature
5.
Which of the following might be evidence of a chemical reaction? a) Formation of magnetism b) Formation of gas c) Formation of gravity d) Formation of new elements
6.
Which of the following can only be separated by a chemical process? a) Matter b) Mixture c) Solution d) Compound
True or False:
7.
False When a chemical change occurs, matter keeps the same chemical properties.
8.
True When matter changes state, it is a physical change.
9.
True Forces between particles in a solid keep them from moving to a new place.

10.
False Gases always have the same shape and volume.
11.
True Chemical properties can be used to remove lead from a solution of lead and other materials.
12.
False Strong acids will turn universal indicator paper purple.
13.
True Lemon juice and vinegar are acids.
14.
True In flame tests, different substances cause a flame to have different colors.
Fill in the blanks
15.
A sentence that describes a chemical reaction using symbols is called a(n) Chemical equation (Chemical equation, Replacement reaction).
16.
A solution is a uniform mixture of two substances (solution, base).
17.
Define the following: a) Boiling Point: The temperature at which a liquid turns to gas. b) Melting Point: The temperature at which a solid turns to liquid
18.
Give two examples of a physical change:
Answers may vary.
Origami, cutting paper, mixing lemonade , etc.
19.
How might a scientist do an experiment to tell whether a substance is a base or an acid?
The scientist could use universal indicator paper or a cabbage juice indicator test to tell whether a substance is an acid or a base. If the substance makes the paper turn red, the substance is an acid. If the paper turns purple, the substance is a base.
20.
What does the Law of Conservation of Mass say?
Matter is not created or destroyed in a chemical reaction. Total mass of the reactants is equal to the total mass of the products.

21.
How can you distinguish between a chemical and physical property?
Physical Properties can be seen or measured without changing a material. Chemical properties indicate how a substance forms or changes into new substances.
22.
Compare the motion and spacing of particles as materials cools form a gas to a liquid and then to a solid phase. Do particles ever stop moving?
Particles slow down as a material cools from a gas to a liquid and then to a solid phase. They will also come closer together. But the particles never stop moving.
23.
How are chemical changes and chemical reactions related?
Chemical changes occur as a result of chemical reactions. Chemical reactions cause chemical change.
24.
During a combination reaction, two hydrogen atoms combine with two oxygen atoms. How many hydrogen and oxygen atoms will be present in the product. Explain your answer.
The product will have two hydrogen atoms and two oxygen atoms in the products also. No atoms are created or destroyed during a chemical reaction. Therefore, we will have the same number of atoms in the products as we did in the reactants.
25.
You bring some hot chocolate powder to school to stir into your hot milk at lunchtime. One friend says that the powder is solid. Another friend says that the powder is a liquid because it flows and takes the shape of the bag you brought it in. Which friend is correct?
Explain your answer.
Even though the powder takes the shape of the bag, it is a solid. The powder is in fact, very tiny pieces of solid. So the first friend is correct.

26.
You take a cold can of juice from the refrigerator on a hot, humid day. Predict whether condensation will occur on the outside of the can. Explain what will happen to the particles.
Condensation will occur on the outside of the can. The water vapor in the air will cool down and sticks together when they come in contact wilh the cold can. This water is the condensation that we will see on the can.
27.
Draw a picture of what particles look like in a solid, in a liquid, and a gas.
28.
What kind of chemical reaction is represented by the chemical equation below? How can you tell?
A g
AgNO
3
+ NaCl -> AgCl + Na NO
3
This is a replacement reaction. It is in fact a double replacement reaction. The silver (Ag) and Sodium (Na) have
N switched places. They have replaced reach other. We could also look at it as the chlorine (Cl) and nitric oxide (NO
O switched places.
3
) have

29.
Identify the products and the reactants in the equation below:
HCl+ NaOH -> NaCl + H
2
O
2
2
2