_________ are the species present before the reaction.
Reactants
100
Balance the following equation: N2 + O2 → N2O5. What is the coefficient of N2O5?
2 (2 N2 + 5 O2 → 2 N2O5)
100
How many H atoms are present in 3 molecules of H2O?
6 H atoms
100
What is the molar mass of ammonium carbonate, (NH4)2CO3?
96.09 g/mol
100
A prospector panning for gold in a river collects 15.0 g of pure gold. How many Au atoms are in this quantity of gold?
4.58 x 10E22 Au atoms
200
A __________ tells us the materials needed and the products formed in a chemical reaction. It also represents the sentence in the language of chemistry. This communicates a chemical change using symbols and formulas to represent the elements and compounds involved in a chemical reaction.
Chemical equation
200
Magnesium chloride and sodium hydroxide react to form magnesium hydroxide and sodium chloride. What is the balanced chemical equation for this reaction?
MgCl2 + 2 NaOH → Mg(OH)2 + 2 NaCl
200
How many moles of H2O are present in 3.01 x 10E24 molecules of H2O?
5.00 moles of H2O
200
What is the mass of 9.2 x 10E-4 mol of Argon?
0.037 g Ar
200
Refer to the equation below:
C3H8 + 5 O2 → 3 CO2 + 4 H2O
How many CO2 molecules are produced when 0.75 moles of C3H8 is combusted?
1.4 x 10E24 CO2 molecules
300
_________ are numbers used to balance a chemical equation.
Coefficients
300
Copper (II) sulfate reacts with Zn metal to produce Cu metals and Zinc sulfate. What is the balanced chemical equation for this reaction?
CuSO4 + Zn → Cu + ZnSO4
300
How many Ag atoms are in 4.56 moles of Ag?
2.75 x 10E24 Ag atoms
300
What is the mass of 0.443 moles of hydrazine, N2H4?
14.2 g
300
What is the mass of 9.08 x 10E21 atoms of Cu?
0.958 g
400
This area of chemistry examines the quantities of substances consumed and produced in chemical reactions.
Stoichiometry
400
Hydrogen gas and chlorine gas react to form Hydrochloric Acid (HCl). What is the balanced chemical equation for this reaction?
H2 + Cl2 → 2 HCl
NOTE: Hydogen gas and chlorine gas are diatomic molecules.
400
How many moles of C are in 1 mole of glucose, C6H12O6?
6 moles of C
400
How many moles of sucrose, C12H22O11, are in a 25 g sample of sucrose?
0.073 mol
400
Refer to the unbalanced equation below:
Al + I2 → AlI3
What is the mole-to-mole factor (stoichiometric ratio) between I2 and AlI3? (Hint: Balance equation first)
A _______ is defined as the amount of a substance that contains 6.02 x 10E23 particles.
Mole
500
What is the coefficient of O2 after balancing the following equation:
C2H6 + O2 → H2O + CO2
7; (2 C2H6 + 7 O2 → 6 H2O + 4 CO2)
500
How many atoms of H are in 2.50 moles of ammonia, NH3?
4.52 x 10E24 H atoms
500
Our bodies synthesize protein from amino acids. One of these amino acids is glycine, which has the molecular formula C2H5O2N. How many moles of glycine are contained in 28.35 g of glycine?
0.378 mol glycine
500
How many moles of of Ca(OH)2 are required to react with 1.36 moles of H3PO4 according to the equation:
3 Ca(OH)2 + 2 H3PO4 → Ca3(PO4)2 + 6 H2O?