What's the Matter?

1. A glass of pure water is classified as: (This is tricky!)

a) a heterogeneous solution
b) a homogeneous solution
c) an element
d) a compound
e) an ionic solution

2. Mixtures are divided into two classes. What are they?

a) Compounds and elements
b) Ionic and covalent
c) Heterogeneous and homogeneous
d) Solution and suspension
e) Colloid and solution

3. Another name for a homogeneous mixture is:

a) a solution
b) a suspension
c) a substance
d) a compound
e) a colloid

4. _____ is not a homogeneous mixture

a) Steel
b) Ice water
c) Vinegar
d) Tap water
e) Salt water

5. An example of an element is:

a) earth
b) water
c) salt
d) silicon
e) sugar

The United States of Matter

1. Which of the following best describes a solid?

a) My particles are packed tightly together. I keep my shape.
b) My particles are loosely packed. I take the shape of my container.
c) My particles have lots of room. I try to spread out in every direction.
d) My particles are packed tightly, but I do not keep my shape.
e) None of the Above

2. Which of the following best describes a liquid?

a) My particles are packed tightly together. I keep my shape.
b) My particles are loosely packed. I take the shape of my container.
c) My particles have lots of room. I try to spread out in every direction.
d) My particles are packed tightly, but I do not keep my shape.
e) None of the Above

3. Which one of these best describes a gas?

a) My particles are packed tightly together. I keep my shape.
b) My particles are loosely packed. I take the shape of my container.
c) My particles have lots of room. I try to spread out in every direction.
d) My particles are packed tightly, but I do not keep my shape.
e) None of the Above
4. Viscosity is defined as:

a) the level of a liquid's stickiness
b) a solid's ability to hold temperature
c) a solid's change in friction as heated
d) a fluid's resistance to flow
e) none of the Above

5. Plasma is made up of:

a) free electrons and ions of an element
b) free electrons and protons
c) super charged neon atoms
d) fast moving negatively charge nuclei of atoms
e) none of the Above

Phase Changes

1. Evaporation ____ occur in a closed container.

a) can
b) can never
c) can only
d) must
e) none of the above

2. The physical change of state known as freezing involves which transformation?

a) Solid to liquid
b) Liquid to gas
c) Gas to solid
d) Gas to liquid
e) Liquid to solid

3. The physical change of state known as melting involves which transformation?

a) Solid to liquid
b) Liquid to gas
c) Gas to solid
d) Gas to liquid
e) Liquid to solid

4. The physical change of state known as sublimation involves which transformation?

a) Solid to liquid
b) Solid to gas
c) Gas to solid
d) Gas to liquid
e) Liquid to solid

5. The physical change of state known as condensation involves which transformation?

a) Solid to liquid
b) Solid to gas
c) Gas to solid
d) Gas to liquid
e) Liquid to solid

Solutions

What's the Matter?

1. A glass of pure water is classified as: (This is tricky!)
d) a compound
Pure water is a collection of solely H₂O molecules therefore pure water is classified as a compound. Tap water or salt water are H₂O molecules and other dissolved ions so these types of water would be considered homogeneous solutions.

2. Mixtures are divided into two classes. What are they?
c) heterogeneous and homogeneousA mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components and you can separate them again. The two types of mixtures are heterogeneous and homogeneous.

3. Another name for a homogeneous mixture is:
a) a solution
A solution is a liquid mixture of two more components, which can also be called a homogeneous mixture.

4. _____ is not a homogeneous mixture
b) Ice water
A homogeneous mixture is a sample of matter consisting of a single phase. All of the above examples are homogeneous except ice water, which is a heterogeneous mixture because it has both a solid and liquid phase present.

5. An example of an element is:
d) silicon
An element is a pure substance that cannot be decomposed. Silicon is one of the 117 elements found on the periodic table.

The United States of Matter

1. Which of the following best describes a solid?
a) My particles are packed tightly together. I keep my shape.
Solids have a definite shape and a definite volume. The particles are tightly packed together sometimes in a rigid crystal lattice.

2. Which of the following best describes a liquid?
b) My particles are loosely packed. I take the shape of my container.
Liquids have a definite volume but do not have a definite shape. The particles in a liquid are close but not as close together as in a solid.

3. Which one of these best describes a gas?
c) My particles have lots of room. I try to spread out in every direction.
Gases do not have a definite volume and do not have a definite shape. They spread out in any direction and take the shape of the container in which they are held, such as a balloon!

4. Viscosity is defined as:
d) A fluid's resistance to flow
By definition viscosity is a fluid's resistance to flow. It is a description of the internal friction created by the flowing particles of the liquid.

5. Plasma is made up of:
a) Free electrons and ions of an element
The particles of plasma are free electrons and ions of an element. Plasma is made up of groups of positively charged particles (the ions of the element) and negatively charged particles (the free electrons).

Phase Changes

1. Evaporation ____ occur in a closed container.
a) can
Evaporation can occur in both an open and closed container. When liquid evaporates in a closed container, gas molecules collect above the liquid as vapor. Evaporation continues until the rate of evaporation of molecules equals the rate of condensation of molecules.

2. The physical change of state known as freezing involves which transformation?
e) liquid to solid
Freezing is the process of converting a liquid into a solid.

3. The physical change of state known as melting involves which transformation?
a) solid to liquid
Melting is the process of converting a solid into a liquid.

4. The physical change of state known as sublimation involves which transformation?
b) solid to gas
Sublimation is the process of converting a solid into a gas.

5. The physical change of state known as condensation involves which transformation?
d) gas to liquid
Condensation is the process of converting a gas into a liquid.