CHEM1100

Practice Test 1

Note: These questions are representative of the types you can expect on the test. The actual test will be longer, typically between 20-40 questions.
You will need to bring a SCANTRON and pencil to each class test.
Instructions: Select the best answer then click on "get answer" box.


Question 1. Which of the following is a physical change only?

a. Lard when heated changes into a liquid
b. Iron rusting
c. Sugar when heated turns brown
d. Milk turns sour
e. Battery cables corrode

Question 2. Which of the following is a chemical change?

a. Lard when heated changes into a liquid
b. water evaporating
c. mixing sugar and water
d. Milk turns sour
e. cutting a piece of copper wire

Question 3. Many home freezers maintain a temperature of 0 ^oF. Express this in ^oC.

a. -32 ^oC
b. -18 ^oC
c. 0 ^oC
d. 18 ^oC
e. 57.6 ^oC

Question 4. Iron has a density of 7.86 g/cm³. The volume of 55.85 g of iron is

a. 0.141 cm³
b. 7.11 cm³
c. 2.8 cm³
d. 439 cm³
e. 4.38 x 10²⁴ cm³

Question 5. An aluminum ion, Al³⁺, has

a. 13 protons and 13 electrons
b. 27 protons and 27 electrons
c. 16 protons and 13 electrons
d. 13 protons and 10 electrons
e. 10 protons and 13 electrons

Question 6. Which pair of elements would most likely form an ionic compound?

a. P and Br
b. F and Al
c. Zn and K
d. C and S
e. H and Br

Question 7. What is the formula for the simple ionic compound formed by calcium and selenium?

a. CaSe₃
b. Ca₂Se
c. CaSe₂
d. Ca₃Se
e. CaSe

Question 8. The correct name for Ba(OH)₂ is

a. barium hydrogen oxide
b. boron hydroxide
c. barium dihydroxide
d. beryllium hydroxide
e. barium hydroxide

Question 9. Identify the compound that has the incorrect formula

a. Ca₃(PO₄)₂ for calcium phosphate
b. NaNO₃ for sodium nitrate
c. K₂CO₃ for potassium carbonate
d. NH₄SO₄ for ammonium sulfate
e. KCl for potassium chloride

Question 10. The Crookes tube was used to discover

a. Protons
b. Electrons
c. Neutrons
d. The nucleus
e. Alpha particles