1 Semester Chemistry Review!

Unit 0-1: Algebra, States of Matter, Mixtures

100

True or False: A chemical change does not involve the rearrangement of the atoms involved in the reaction.

False

200

Trail mix is an example of a (homogenous or heterogenous) mixture

heterogenous

300

Isolate x in the following equation:

2x -6 = 10

x = 8

400

What type of variable is directly manipulated by the scientist during an experiment to help verify or disprove their hypothesis?

Independent Variable

500

Isolate for X in the following equation:

V/M = Z/X

X = MZ/V

Unit 2: Elements, Atoms, and Ions

100

How many protons does Nitrogen have?

7

200

What is the rule that states that atoms will gain or lose electrons in order to gain a full valence shell?

Octet rule

300

Why are noble gases inert (non-reactive)?

Because they already have a full valence shell and therefore don't need to react with other atoms to gain or lose electrons.

400

How are the mass number and the molar mass different?

The mass number is the total number of protons and neutrons in an isotope of an element, the molar mass is an average mass of all isotopes of one element.

500

An isotope of Carbon has 5 neutrons in its nucleus. What is the mass number of that isotope?

11 (5 neutrons + 6 protons)

Unit 4-5: Measurement, Average Mass, Moles

100

Write the following number in scientific notation:

120

1.2x10²

200

What is the molar mass of Strontium?

87.62 g/mol

300

Write the following number in standard notation:

5.0048 x 10^-5

.000050048

400

Find the molar mass of the following compound: C₂H₂O₂

(12.011x2) + (1.008x2) + (16x2) = 58.038 g/mol

500

What is the proper setup to convert 56.2 kg to lbs using dimensional analysis? (1lb = .45 kg)

56.2kg * (1lb/.45kg)

Unit 6: Balancing, Types of Chemical Reactions

100

What does (s) mean in a chemical reaction?

The chemical species is in solid form

200

In a balanced chemical reaction, what is the difference between the coefficients and the subscripts?

The coefficients tell you the number of moles of each type of molecule, the subscripts tell you the number of atoms

300

What is the general form of a decomposition reaction?

AB --> A + B

400

What is an indicator that a combustion reaction has occurred?

O₂ is used as a reactant and CO₂ and H₂O are created as products

500

What are the coefficients needed to balance the following chemical equation?: __Fe + __O₂ --> __Fe₂O₃

4 3 2

Unit 7: Electrons in Reactions, Molecular/Net Ionic

100

Lithium (loses or gains) __ electrons to get a full duet of 2 electrons

Lithium loses 1 electron to gain a full duet of 2 electrons

200

Split the following molecule into ions:

NaCl

Na⁺ + Cl^-

300

What is the difference between a complete ionic equation and a net ionic equation?

A complete ionic equation shows all species dissolved into ions while a net ionic equation does not include spectator ions, only ions that comprise of a solid, liquid, or gas.

400

Why does oxygen become an ion with a -2 charge?

Because oxygen requires 2 electrons to earn a full valence shell. When it gains 2 electrons, it also gains and overall charge of -2.

500

Split the following molecule into ions (CO₃ has a charge of -2):

B₂(CO₃)₃ 

2B⁺³ + 3CO₃^-2