Whole semester
Empirical/Molecular Formula
Limiting/Excess
Balancing Equations
The Mole
100

Complete the calculation to the proper number of significant figures

0.0240 x 109840

2640

100

What is the empirical formula?

The smallest whole number ratio (proportions) of elements in a compound.

100

What is the limiting reactant?

The limiting reactant is the reactant that is entirely consumed in a chemical reaction. Upon consumption, the reaction stops.


It limits the amount of product that is made. 

100

Balance the equation ___H2 + __O2 --> H2O

2H2 + O2 --> 2H2O

100

What is avogadro's number?

1 mole of an item = 6.02x1023 of that item

200

What type of reaction is this?

NaOH + HClO4 --> NaClO4 + H2O

Double replacement

200

What is the empirical formula of an element that is 15.8% carbon, 84.2% sulfur

CS2

200

2H2 + O2 --> 2H2O

What is the limiting reactant if 1 mol of H2 and 1 mol of O2 reacts?

Hydrogen is the limiting reactant 

200

Balance the equation Cu + O2 --> CuO

2Cu + O2 --> 2CuO

200
How many hydrogen atoms are in 2.5 moles of H2O?

1.5x1024 hydrogen atoms

300

Name the following chemicals:

NaClO2

N8O3

FeCl3

Sodium chlorite

Octanitrogen trioxide

Iron (III) chloride

300

What is the empirical formula of a compound that is 40% carbon, 6.7% hydrogen, 53.3% oxygen

CH2O

300

2H2 + O2 --> 2H2O

What is the limiting reactant if 101 g of H2 and 160 g of O2 reacts?


oxygen is the limiting reactant
300

Balance the equation 

NH3 + O2 -->  NO +  H2O

4 NH3 + 5 O2 --> 4 NO + 6 H2O

300

What is the molar mass of a 0.359 mole sample that weighs 15.8 g?

44.01 g/mol

400

PERIODIC TRENDS:

Within a family (up and down) such as the alkali metals, why does atomic radius increase as atomic number increases?

- SHIELDING (increased energy levels)

400

What is the molecular formula of a chemical with empirical formula C2H6 and molecular weight of 150.4 g/mol?

C10H30

400

2H2 + O2 --> 2H2O


What mass of water can be produced by 4.04 g of H2 and 24g of O2?

36.04 g of water can be produced

400

Balance the equation

C3H8 + O2 --> CO2 + H2O

C3H8 + 5O2 --> 3CO2 + 4H2O

400

What is the mass of 2.53 mol of Cu3(PO4)?

722.62 g

500

Why is there an increase in first ionization energy from Li to Ne?

- Radius decreases due to increased effective nuclear charge (ie, more protons attract the added electrons in the same energy level)

- decreased radius = greater attraction experienced by valence electrons  

- more energy to remove an electron = higher 1st ionization energy

500

What is the molecular formula of a chemical with the composition of 86.88% carbon and 13.12% hydrogen, with a molecular weight of 165.33 g/mol.

C12H21

500

Cl2 + 2NaBr --> 2NaCl + Br2

What is the limiting reactant if 35.45 g of chlorine gas reacts with 25.72 g of NaBr?

NaBr is the limiting reactant
500

Balance the equation


C6H5COOH + O2 --> CO2 + H2O

2C6H5COOH + 15O2 --> 14CO2 + 6H2O

500

How many hydrogen atoms are in a 28.3 g sample of H2SO4?

3.47x1023 hydrogen atoms