CHEM 108 Exam 1 – Study Guide, Practice Questions & Chemistry Exam Review
Which of the following is a homogeneous mixture?
(A) Titanium (B) Salad (C) Carbon Dioxide (D) Copper (E) Salt Water - correct answer ✔✔(E) Salt
Water
Which of the following is a pure substance?
(A) Ice Cream (B) Milk (C) Carbon Monoxide (D) Wood - correct answer ✔✔(C) Carbon Monixide
Which of the following represents the smallest length?
(A) 100m (B) 100km (C) 100mm (D) 100nm (E) 100μm - correct answer ✔✔(D) 100nm
What is a chemical process?
(A) Melting of lead (B) Dissolving sugar in water (C) Tarnishing of silver (D) Crushing of stone -
correct answer ✔✔(C) Tarnishing of silver
Which one is not a pure substance?
(A) Water (B) Oxygen (C) Air (D) Chlorine - correct answer ✔✔(C) Air
Which of the following is a chemical change?
, (A) Dissolving sugar in coffee (B) Melting Ice (C) Tearing Paper (D) Burning Wood (E) Mixing
Sugar and Salt - correct answer ✔✔(D) Burning Wood
Passing an electric current through a certain substance produces oxygen and sulfur. This
substance cannot be a(n)
(A) Compound (B) Mixture (C) Element (D) Pure Substance - correct answer ✔✔(C) Element
What is the symbol for the element potassium?
(A) K (B) Po (C) P (D) Kr - correct answer ✔✔(A) K
The elements calcium and fluorine combine to form the mineral fluorspar. The symbols for
those elements are
(A) K and F (B) Ca and F (C) Ca and Fl (D) Na and F - correct answer ✔✔(B) Ca and F
The law of constant composition applies to
(A) Heterogeneous mixtures (B) Compounds (C) Homogeneous mixtures (D) Solids (E) Solutions
- correct answer ✔✔(B) Compounds
How many significant figures should there be in the answer to the following problem? (29.2-
20.0)(1.79x105)/1.39
(A) 1 (B) 2 (C) 3 (D) 4 - correct answer ✔✔(B) 2
Round the number 0.07535 to two significant figures.
Which of the following is a homogeneous mixture?
(A) Titanium (B) Salad (C) Carbon Dioxide (D) Copper (E) Salt Water - correct answer ✔✔(E) Salt
Water
Which of the following is a pure substance?
(A) Ice Cream (B) Milk (C) Carbon Monoxide (D) Wood - correct answer ✔✔(C) Carbon Monixide
Which of the following represents the smallest length?
(A) 100m (B) 100km (C) 100mm (D) 100nm (E) 100μm - correct answer ✔✔(D) 100nm
What is a chemical process?
(A) Melting of lead (B) Dissolving sugar in water (C) Tarnishing of silver (D) Crushing of stone -
correct answer ✔✔(C) Tarnishing of silver
Which one is not a pure substance?
(A) Water (B) Oxygen (C) Air (D) Chlorine - correct answer ✔✔(C) Air
Which of the following is a chemical change?
, (A) Dissolving sugar in coffee (B) Melting Ice (C) Tearing Paper (D) Burning Wood (E) Mixing
Sugar and Salt - correct answer ✔✔(D) Burning Wood
Passing an electric current through a certain substance produces oxygen and sulfur. This
substance cannot be a(n)
(A) Compound (B) Mixture (C) Element (D) Pure Substance - correct answer ✔✔(C) Element
What is the symbol for the element potassium?
(A) K (B) Po (C) P (D) Kr - correct answer ✔✔(A) K
The elements calcium and fluorine combine to form the mineral fluorspar. The symbols for
those elements are
(A) K and F (B) Ca and F (C) Ca and Fl (D) Na and F - correct answer ✔✔(B) Ca and F
The law of constant composition applies to
(A) Heterogeneous mixtures (B) Compounds (C) Homogeneous mixtures (D) Solids (E) Solutions
- correct answer ✔✔(B) Compounds
How many significant figures should there be in the answer to the following problem? (29.2-
20.0)(1.79x105)/1.39
(A) 1 (B) 2 (C) 3 (D) 4 - correct answer ✔✔(B) 2
Round the number 0.07535 to two significant figures.
