Dimensional Analysis
Atoms and Subatomic Particles
Average Atomic Mass
Ionic Compounds
Molecular Compounds
100

How many seconds are there in 2.50 years? Remember sig figs! 

63,072,000 s --> 6.31 x 107

100

What are the subatomic particles that make up an atom? 

protons, electrons, and neutrons

100

In simple words, what is atomic mass?

Weighted average of the atomic masses of the naturally occurring isotopes of that element

100

Write the name of the compound:

FeCl₃

Iron (III) chloride

100

Write the chemical name for both:

NH3 and CH4

Ammonia and Methane

200

To reach the top of a tree, you have to climb 5.8  meters.  How many hands is that?   

(1 inch = 2.54 cm) (1 hand = 4 inches)(1 m =100cm)

57 hands

200

Who is the scientist that first suggested the existence of atoms? Additionally, he suggested that atoms are indivisible and indestructable

Democritus

200

What is the mathematical setup for solving average atomic mass? 

[(isotope amu × abundance in decimal form)] + [(isotope amu × abundance in decimal form)] + ... 

200

Write the chemical formula for:

Calcium hydroxide

Ca(OH)2

200

Write the chemical name:

Cl₂O₇

Dichlorine heptoxide 
300

The pressure reading from a barometer is 649 mmHg. Express this reading in kilopascals, kPa. (Use 760 mmHg = 1.013 x 105 Pa). Remember sig figs!

86.5 kPa

300

What does the number next to isotopes signify (For example, what does the 14 in Carbon-14 represent)?

Mass number

300

Magnesium has three naturally occurring isotopes:

  • 78.99% have a mass of 23.985 amu
  • 10.00% have a mass of 24.986 amu
  • 11.01% have a mass of 25.983 amu

Calculate the average atomic mass of magnesium to two decimal places. Show your work and units!

[(23.985)(0.7899)] + [(24.986)(0.1000)] + [(25.983)(0.1101)]

24.31 amu

300

Write the chemical formula:

Aluminum carbonate

Al2(CO3)3

300

Write the formula:

Xenon tetrafluoride

XeF₄

400

A car is traveling at 65.0 miles per hour. How fast is the car traveling in meters per second (m/s)? Remember sig figs!!

1 mile = 1.609 km

29.0 m/s

400

An atom has 17 protons, 20 neutrons, and 16 electrons.

a. What element is it?

b. What is its mass number?

c. What is its charge?

d. Write the complete element notation.

e. Is this an isotope? 

a. Cl

b. 37

c. +1

d. ³⁷₁₇Cl⁺

e. Yes

400

Silver has two naturally occurring isotopes:

  • 51.839% have a mass of 106.905 amu
  • 48.161% have a mass of 108.904 amu

Calculate the average atomic mass of silver to two decimal places. Show your work and units!

[(106.905)(0.51839)] + [(108.904)(0.48161)]

107.87 amu

400

Write the chemical name:

Pb(SO4)2


Lead (IV) sulfate

400

Write the chemical name:

C8H10

Octacarbon decahydride

500

A laboratory container holds 2.75 gallons of liquid. How many milliliters (mL) does it contain? Remember sig figs!!

1 gal = 4 qt

1 qt =2 pt

1 pt = 2 cups

1 cup=8 fl oz

1 fl oz = 29.57 mL

5.20 x 103 mL

500

An atom has 26 protons, 30 neutrons, and 23 electrons.


a. What element is it?

b. What is its mass number?

c. What is its charge?

d. Write the complete element notation

e. Is this an isotope?

a. Iron 

b. 56

c. +3 

d. ⁵⁶₂₆ Fe ³⁺

e. Yes 

500

Element X has four naturally occurring isotopes:

  • 40.00% have a mass of 49.946 amu
  • 25.00% have a mass of 50.944 amu
  • 20.00% have a mass of 51.941 amu
  • 15.00% have a mass of 52.941 amu

Calculate the average atomic mass of Element X to two decimal places. Show your work and units! 

[(49.946)(0.4000)] + [(50.944)(0.2500)] + [(51.941)(0.2000)] + [(52.941)(0.1500)]

50.94 amu 

500
Write the formula:

Ammonium carbonate

(NH₄)₂CO₃

500

Write the formula:

Tetranitrogen nonaoxide

N₄O₉

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