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Mixtures
Properties of Matter
Kinetic theory
Density
Mystery
100

Which material is a mixture?

  1. water
  2. air
  3. methane
  4. magnesium

2. air

100

Element A and element B chemically combine to form substance C. Substance C must be

  1. a solution
  2. a compound
  3. an element
  4. a mixture

2. a compound

100

As the temperature of a gas is increased, the average kinetic energy of its molecules

  1. decreases
  2. increases
  3. remains the same

2. increases

100

A cube has a volume of 8.0 cm³ and a mass of 21.6 grams. The density of the cube, in grams per cubic centimeter, is best expressed as

  1. 2.7
  2. 2.70
  3. 0.37
  4. 0.370

1. 2.7 

100

During a laboratory activity, a student combined two solutions. In the laboratory report, the student wrote “A yellow color appeared.” The statement represents the student’s recorded

  1. conclusion
  2. observation
  3. hypothesis
  4. inference

2. observation

200

Which is a characteristic of all mixtures?

  1. They are homogeneous.
  2. They are heterogeneous.
  3. Their composition is in a definite ratio.
  4. Their composition can be varied.

4. Their composition can be varied

200

A substance that is composed only of atoms having the same atomic number is classified as

  1. a compound
  2. an element
  3. a homogeneous mixture
  4. a heterogeneous mixture

2. an element

200

Which statement describes the particles of an ideal gas, based on the kinetic molecular theory?

  1. The motion of the gas particles is orderly and circular.
  2. The gas particles have no attractive forces between them.
  3. a homogeneous mixture
  4. a heterogeneous mixture

2. The gas particles have no attractive forces between them.

200

Calcium chloride is used to de-ice roads in the winter. It has a density of 2.50 g/cm3. What is the mass of 15.0 cm3 of CaCl2?

m=37.5 g

200

One similarity between all mixtures and compounds is that both

  1. are heterogeneous
  2. are homogeneous
  3. combine in a definite ratio
  4. consist of two or more substances

4. Consist of two or more substances

300

Which of these terms refers to matter that could be heterogeneous?

  1. element
  2. mixture
  3. compound
  4. solution

2. mixture

300

Which species represents a chemical compound?

  1. N2
  2. O2
  3. Na
  4. NaHCO

4. NaHCO

300

A sample of a gas is contained in a closed rigid cylinder. According to kinetic molecular theory, what occurs when the gas inside the cylinder is heated?

  1. The number of gas molecules increases.
  2. The number of collisions between gas molecules per unit time decreases.
  3. The average velocity of the gas molecules increases.
  4. The volume of the gas decreases.

3. The average velocity of the gas molecules increases.

300

What is the density of a wood board whose dimensions are 5.54 cm x 10.6 cm x 175 cm and whose mass is 28,600 g?

D=2.78 g/cm3

300

In an aqueous solution of potassium chloride, the solute is

  1. Cl
  2. K
  3. KCl
  4. H2O

3. KCl

400

Which statement is an identifying characteristic of a mixture?

  1. A mixture can consist of a single element.
  2. A mixture can be separated by physical means.
  3. A mixture must have a definite composition by weight.
  4. A mixture must be homogeneous.

2. A mixture can be separated by physical means.

400

Which statement describes a characteristic of all compounds?

  1. Compounds contain one element, only.
  2. Compounds contain two elements, only.
  3. Compounds can be decomposed by chemical means.
  4. Compounds can be decomposed by physical means.

3. Compounds can be decomposed by chemical means. 

400

An assumption of the kinetic theory of gases is that the particles of a gas have

  1. little attraction for each other and a significant volume
  2. little attraction for each other and an insignificant volume
  3. strong attraction for each other and a significant volume
  4. strong attraction for each other and an insignificant volume

2. little attraction for each other and an insignificant volume

400

The density of water is.....

1 g/mL

400

Which of the following is a chemical change? 

1. cutting paper

2. sanding wood

3. burning wood

4. melting 

3. burning wood

500

When sample X is passed through a filter paper, a white residue, Y, remains on the paper and a clear liquid, Z, passes through. When liquid Z is vaporized, another white residue remains. Sample X is best classified as

  1. an element
  2. a compound
  3. a heterogeneous mixture
  4. a homogeneous mixture

3. a heterogeneous mixture

500

The table below shows mass and volume data for four samples of substances at 298 K and 1 atmosphere.

Masses and Volumes of Four Samples

Sample.    Mass(g)      Volume(mL)

A                30.                 60.

B                40.                 50.

C                45                  90.

D                90.                120.

Which two samples could consist of the same substance?

  1. A and B
  2. A and C
  3. B and C
  4. C and D

  2. A and C

500

When the average kinetic energy of a gaseous system is increased, the average molecular velocity of the system

  1. increases and the molecular mass increases
  2. decreases and the molecular mass increases
  3. increases and the molecular mass remains the same
  4. decreases and the molecular mass remains the same

3. increases and the molecular mass remains the same

500

To determine the density of an irregularly shaped object, a student immersed the object in 21.2 milliliters of h20 in a graduated cylinder, causing the level of the h2o to rise to 27.8 milliliters. If the object had a mass of 22.4 grams, what was the density of the object?

  1. 27.8 g/mL
  2. 6.6 g/mL
  3. 3.0 g/mL
  4. 3.4 g/mL

4. 3.4

500

Which measurement contains a total of three significant figures?

  1. 0.01 g
  2. 0.010 g
  3. 0.0100 g
  4. 0.01000 g

3. 0.0100 g