CHM 1040: Final Review

Chemical equations..

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

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

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

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

Spectator ions are..

(A) 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
(B) none of these are correct
(C) a, b, & c are all correct
(D) ions formed by an element from group IA
(E) the ions that do not undergo any change during a reaction

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

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

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

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

Compounds containing only 2 chemical elements are called

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

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

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

Choose the false statements.

(A) 6.022 x 10²³ hydrogen atoms weigh 1.008 g.
(B) 1 mol of carbon atoms weighs 12.0 g.
(C) 6.022 x 10²³ atoms = 1 mol atoms
(D) Oxygen is a diatomic gas
(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) CH₂O
(B) C₂H₄O₂
(C) C₂H₆O
(D) C₂HO₂
(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 Constant Mass Ratio
(C) Law of Conservation of Mass
(D) Law of Constant Whole Number Ratio
(E) none of the above

Which of the following is a molecular compound?

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

What metric prefix is used to designate 1/1000?

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

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

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