Midterm Review

Misc. 1

100

Unit used for measuring volume of a liquid

mL or L

200

Definition of matter

has mass & takes up space

300

Symbol for Mg when it has lost 2 electrons

Mg⁺²

400

Number of significant figures in 0.005086020

7 sig figs

500

Difference between physical and chemical changes

AND give an example of each

Chemical - one or more substances are altered into NEW substances

Physical - substance is still essentially the same substance (i.e. a phase change)

Atomic Structure

100

Charge of proton, neutron & electron

proton - positive

neutron - no charge/neutral

electron - negative 

200

Number of protons in chlorine

17

300

Number of electrons in Al⁺³ 

10 electrons

400

Number of neutrons in copper when the mass number is 64 

35

500

Atomic number, # of protons, # of neutrons, # of electrons  for phosphorus

Mass number is 31

atomic number - 15

protons - 15

neutrons - 16

electrons - 15

Mole Conversions

100

Conversion factor used to go from moles to grams

1 mole = molar mass

200

Convert 25 grams of H₂O to moles of H₂O

1.39 moles H₂O

300

Convert 2 moles of C₂H₄ to molecules 

1.204 X 10²³

400

Convert 0.25 moles of nitrogen to grams

7.005 grams

500

Convert 85g of Ca₃(PO₄)₂ to moles 

0.274 moles 

Misc. 2

100

Zn is an example of a _________ while ZnCl₂ is an example of a ____________

element, compound

200

Density of a 30mL of a liquid that has a mass of 10 grams. Include units in your answer.

0.333 g/mL

300

List the state symbols for each state of matter in a chemical equation

(s), (l), (g), (aq)

400

Calculate the percent composition of oxygen in Ca(OH)₂

 43.24% Oxygen

500

A compound contains 87.4% nitrogen and 12.6% hydrogen. If the molecular mass of the compound is 32.05 g/mol, what is the molecular formula?

N₂H₄

Types of Reactions

100

Name the type of reaction 

H₂ + KCl  --> K  + HCl

Single Displacement 

200

Predict the products & balance the equation

Mg + N₂  -->

3Mg + N₂  --> Mg₃N₂

300

Name two indications that a chemical reaction has occurred

- evolution of energy as heat/light

- production of a gas

- formation of a precipitate

- color change

400

Name the type of rxn, predict the products & balance the equation

AlCl₃ + Br₂ -->

Single Displacement

2AlCl₃ + 3Br₂ --> 2AlBr₃ + 3Cl₂

500

Name the type of rxn, predict the products & balance the equation

BaSO₄ +  Mg(NO₃)₂

Double Displacement

BaSO₄ +  Mg(NO₃)₂ --> Ba(NO₃)₂ +  MgSO₄