CHM 1040: Final Review

Chemical equations..

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

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

(A) Ca(HCO₃)₂
(B) NO
(C) K₂CO₃
(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) double replacement
(B) single-replacement
(C) decomposition
(D) combination

Spectator ions are..

(A) none of these are correct
(B) ions formed by an element from group IA
(C) a, b, & c are all correct
(D) 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
(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) a cation
(B) none of these
(C) all of these
(D) an anion
(E) oxidized

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

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

Compounds containing only 2 chemical elements are called

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

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

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

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) 1 mol = 6.022 x 10²³ amu
(D) Oxygen is a diatomic gas
(E) 6.022 x 10²³ atoms = 1 mol atoms

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

(A) C₂H₆O
(B) CH₂O
(C) C₂H₄O₂
(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 Whole Number Ratio
(B) Law of Conservation of Mass
(C) Law of Constant Mass Ratio
(D) Law of Constant Composition
(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) nano
(B) milli
(C) mega
(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) colloid
(B) gas
(C) liquid
(D) plasma
(E) solid