CHM 1040: Final Review

Chemical equations..

(A) describe chemical reactions
(B) give directions for naming chemical compounds
(C) describe only biological changes
(D) show how to write chemical equations

The complete combustion of which of the following substances produces carbon dioxide and water?

(A) C₄H₁₀
(B) K₂CO₃
(C) Ca(HCO₃)₂
(D) NO

Which of the following is evidence for a chemical reaction?

(A) a gas is detected
(B) a precipitate is formed
(C) a color change is observed
(D) light is produced
(E) all of the above

Classify the following reaction:
(NH₄)₂Cr₂O₇-> NH₃ + H₂O + Cr₂O₃

(A) double replacement
(B) decomposition
(C) combination
(D) single-replacement

Spectator ions are..

(A) the ions that do not undergo any change during a reaction
(B) the ions that will be represented on the left side of an equation as hydrated ions, while on the right side of the equation, will be represented as part of the compound that formed a precipitate
(C) none of these are correct
(D) a, b, & c are all correct
(E) ions formed by an element from group IA

In a chemical reaction an atom of sulfur gains 2 electrons to become

(A) all of these
(B) a cation
(C) none of these
(D) oxidized
(E) an anion

Which of the following is NOT correct regarding the reactants of a chemical reaction?

(A) They are written on the left side
(B) The mass of the products is usually a little than the mass of the reactants.
(C) They are the substances that interact with one another.
(D) A plus sign (+) is used to separate one from another

Compounds containing only 2 chemical elements are called

(A) mixtures
(B) binary compounds
(C) heterogeneous substances
(D) none of these
(E) ternary compounds

Because atoms are so ______, the standard units of mass are not useful in measurements.

(A) unstable
(B) varied
(C) scattered
(D) small
(E) electrically charged

Choose the false statements.

(A) 1 mol of carbon atoms weighs 12.0 g.
(B) 6.022 x 10²³ atoms = 1 mol atoms
(C) Oxygen is a diatomic gas
(D) 6.022 x 10²³ hydrogen atoms weigh 1.008 g.
(E) 1 mol = 6.022 x 10²³ amu

The empirical formula for acetic acid is CH2O. Its molar mass is 60g/mol. The molecular formula is

(A) C₂HO₂
(B) C₂H₆O
(C) C₂H₄O₂
(D) CH₂O
(E) none of the above

The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law?

(A) Law of Constant Composition
(B) Law of Conservation of Mass
(C) Law of Constant Whole Number Ratio
(D) Law of Constant Mass Ratio
(E) none of the above

Which of the following is a molecular compound?

(A) potassium hydroxide
(B) calcium
(C) barium sulfide
(D) nitrogen monoxide
(E) none of the above

What metric prefix is used to designate 1/1000?

(A) nano
(B) mega
(C) milli
(D) kilo
(E) micro

Cesium melts at 302 K and boils at 944 K. Whatr is the physical state of cesium at 25 degree celsius?

(A) solid
(B) plasma
(C) gas
(D) colloid
(E) liquid