Density And Law Of Conservation Of Mass
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.
Graduated cylinder, meter stick
- B.
Beaker, stop watch
- C.
Graduated cylinder, triple beam balance
- 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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