Chem Quizzes

1 - What are the coefficients for the reactants and the products when the equation for the reaction:
Ca(OH)2 (aq) + HNO3 (aq) → Ca(NO3)2 (s) + H2O (ℓ) is balanced?
1, 4, 2, 4
1, 2, 1, 2
1, 1, 1, 2
None of the above

2 - The mass in grams of two moles of iron atoms is:
26.00 g
55.847 g
111.69 g
27.923 g

3 - The formula mass of nitric acid is given by:
31.50 g/mol
17.03 g/mol
63.01 g/mol
126.02 g/mol

4 - Sodium oxide has the formula:
Na2O
Na2O2
NaO2
Na4O2

5 - The correct name for (NH4)2SO4 is:
Ammonium bisulfate
Ammonium hydrogen sulfate
Ammonium sulfate
Ammonium (I) sulfate

6 - If the density of a substance is 4.070 g/mL, what is the volume (expressed in scientific notation with appropriate number of significant figures) in milliliters of a piece of this substance with a mass of 7.73 g?
31.46 mL
1.90 × 100 mL
0.526 mL
1.26 × 102 mL

7 - After performing a calculation, Maria's calculator displayed the result as 15.25927. If the answer can have only four significant figures and must be expressed using scientific notation, it should be reported as:
15.26
15.26 × 100
1.526 × 10
152.6 × 10-1

8 - A quantity of 5.44 mg of a substance can be expressed in scientific notation as:
5.44 × 10-3 g
5.4 × 100 g
(544/100) mg
0.54 × 10 mg

9 - Pure tin is classified as:
An ion
An element
A compound
A molecule

10 - Element with an atomic number of 14 is a:
Metal
Non-metal
Metalloid
None of the above

11 - Anions are formed by the:
Gain of electrons
Loss of electrons
Loss of neutrons
Gain of protons

12 - An object had a mass of 14.23 g when weighed on a balance. The uncertain digit in the measurement is:
1
4
2
3

13 - The smallest volume is represented by:
1.0 L
20.0 mL
4.0 × 10-2 L
1.0 × 104 cm3

14 - In the Periodic Table, the inert gases are in the same
Sector
Period
Group
None of the above

15 - The final answer for the calculation, (4.15 × 10-5) × (1.1 × 105)