CHEM109 Exam 1 Review

Chapter 1

100

What is 997 500 rounded to 3 sig figs?

998000

200

What volume of silver metal will mass 2500.0 g. The density of silver is 10.5 g/cm3

238 cm^3

300

A rectangular block of copper metal mass is 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper?

8.9 g/cm³

400

How many days are in 340 minutes?

0.24 days

500

What is (7.0 × 10⁴) ÷ (8.80 × 10⁴)?

8.0 × 10^-1

Chapter 2

100

The chemical formula for Hydrobromic acid

HBr

200

Mass number for an isotope with 18 protons and 23 neutrons

41

300

The name of the chemical with the formula H₃PO₄

Phosphoric acid

400

What is the isotope notation for gallium-78?

⁷⁸

₃₁Ga

500

Copper exists as a mixture of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu. Calculate the atomic mass (am) of copper.

63.55 amu

Chapter 3

100

How many moles of Na2CO3 are there in 53.0 grams of Na2CO3? (answer in the correct number of sig figs)  

0.500

200

What is the mass in grams of 2.45 moles of Ca atoms?

98.2

300

Determine the empirical formula of a compound which is 15.8% carbon and 84.2% sulfur by mass.

CS₂

400

Given the following balanced chemical equation:

2Al(s) + 3Br₂(l) → 2AlBr₃(s)

Calculate the theoretical yield of Aluminum bromide if 6.0g of Aluminum was reacted with bromine. 

59.3 g AlBr₃

500

How many grams of NH₃ are needed when 2.6 grams of Cr(NO₃)₃ react according to this synthesis reaction:

Cr(NO₃)₃ +   NH₃ -->  Cr(NH₃)₆(NO₃)₃

_{Hint: You need to balance the equation first!}

1.12 g NH₃

Mixed Bag

100

The chemical formula for Iron(III) bromide

FeBr3

200

Balance the following equation

___ AgNO3 (aq) + ___ Na2SO4 (aq) → ___ Ag2SO4 (s) + ___ NaNO3 (aq)

2 AgNO3 (aq) +  Na2SO4 (aq) →  Ag2SO4 (s) + 2 NaNO3 (aq)

300

The written name for the chemical with the formula NH4+

Ammonium

400

What atomic model did Rutherford's gold foil experiment point to?

Nuclear atom

500

A compound consists of 72.2% magnesium and 27.8% nitrogen by mass. What is the empirical formula?

Mg₃N₂

Vocab

100

Compounds consisting of a metal and a nonmetal

Ionic compound

200

a substance that has the same chemical and physical properties through and cannot be separated by a physical process

Pure substance

300

Type of mixture which contains two different compounds that are not fully mixed together 

Heterogenous

400

Substance that is completely consumed in a chemical reaction and determines the amount of product formed by a reaction

Limiting reagent

500

Is the following an example of a anion or a cation? 

Br^-

Anion