# Density And Law Of Conservation Of Mass

9 Questions | Attempts: 787
Share  Settings  TAKS Objective 4 TEKs 74, 8A, 8C

• 1.
What are the units for density?
• A.

G/m

• B.

M/mL

• C.

G/cm3

• D.

Cm3/mL

• 2.
What pieces of equipment are used to calculate the density of a liquid?
• A.

• B.

Beaker, stop watch

• C.

• D.

Beaker, triple beam balance

• 3.
What is the density at 20˚C of 12.0 milliliters of a liquid that has a mass of 4.05 grams?
• A.

0.33 g/mL

• B.

2.96 g/mL

• C.

16.1 g/mL

• D.

48.6 g/mL

• 4.
If all the reactants in a chemical reaction are completely used, which of the following statements accurately describes the relationship between the reactants and the products?
• A.

The products must have different physical state than the reactants.

• B.

The total mass of the reactants must equal the total mass of the products.

• C.

The reactants must contain more complex molecules than the products do.

• D.

The density of the reactants must equal the density of the products.

• 5.
As the viscosity of a liquid increases, the liquid —
• A.

Conducts electricity

• B.

Pours more slowly

• C.

Evaporates more quickly

• D.

Forms a precipitate

• 6.
Which process best demonstrates a chemical change in distilled water?
• A.

Freezing water.

• B.

Separating water into its elements.

• C.

Calculating density.

• D.

Dissolving sugar in water.

• 7.
When a 1-kilogram log was burned, 0.05 kilogram of ash was produced. The mass of the ash is less than the mass of the log because —
• A.

Wind carried away some matter before it burned

• B.

Some matter was converted to gases that were released

• C.

Combustion changed some matter into energy

• D.

Some matter was decomposed by organisms in the soil

• 8.
Use the following reaction to answer the question: K + H2O → KOH + H2What is the coefficient for H2O when the above equation is balanced?
• A.

1

• B.

2

• C.

3

• D.

4

• 9.
When CaCO3 is heated, it forms CaO and CO2. Which of these statements best describes the mass of the products if 100 g of CaCO3 is heated?
• A.

The difference in the products’ masses is equal to the mass of the CaCO3.

• B.

The sum of the products’ masses is less than the mass of the CaCO3.

• C.

The mass of each product is equal to the mass of the CaCO3.

• D.

The sum of the products’ masses equals the mass of the CaCO3.

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