EDM Chem B Unit 1 Review

What is the solution to this problem expressed to the correct number of sig figs? 12.0 / 7.11

• 1.688

• 1.69

• 1.7

• 1.70

What is the solution to the problem expressed to the correct number of significant figures?

15.11 + (142 × 16.5) = ?

• 2,358.1

• 2,358

• 2,360

• 2,400

Match the following

• 0.0093

• Two Significant Figures

• 1.008

• Three Significant Figures

• 1.30

• One Significant Figure

• 1,000

• Four Significant Figures

Given:

SiO₂ + 4HF → SiF₄ + 2H₂O

Reorder the following to correctly find how many grams of HF are needed for 182 mol of SiO₂ to react completely.

• 4 mol HF

  2 mol SiO₂

• 242 g HF

• 182 mol SiO₂

• 20.0 g HF

  1 mol HF

The density of glycerin is 1.26 g/cm³. Which of the following conversion factors would you use to convert this to pounds/ft³?

1.26 g/cm³ x ​ ​ ​ (a)   x ​ ​ ​ (b)   = ​ (c)  

• 1 lb/454 g
• 28,317 cm3/ft3
• = 78.6 lb/ft3
• 454 g/1 lb
• 1 ft3/28,317 cm3
• = 0.0202 lb/ft3

14 milligrams of CaCO₃ can dissolve in 1 liter of water.

What is the proper setup to determine much water would be required to fully dissolve 11 grams of CaCO₃?

(1000 mg = 1 g)

11 g CaCO₃ x​ ​ (a)   ​ ​ ​ ​= ​ 790 L

• 1 Liter H2O/0.014 g CaCO3
• 0.014 g CaCO3/ 1 L H2O

What is the molar mass of Al2O3?

• 135.0

• 97.2

• 102.0

• 219.1

Jessica has 12.7 moles of a compound for an experiment. How many particles of the compound does she have? hint: 1 mole = 6.022 x 10²³

• 7.65 × 10²³

• 7.65 × 10²⁴

• 2.1 x 10^-23

• 2.1 x 10^-23

Which of the following is the empirical formula?

• C₂H₄

• C₃H₆

• C₄H₈

• CH₂

A compound has an empirical formula of C₂H₅. What is true about this empirical formula?

• It models the structure of the compound.

• It shows the ratio of elements in the compound.

• It gives the mass of each atom in the compound.

• It indicates the number of atoms in the compound.

• It describes only this one compound.