Chemical Reactions
Identify the reaction type: 2H2+O2→2H2O
Synthesis
What is the mole ratio between H2 and H2O in 2H2+O2→2H2O?
2 moles H2 : 2 moles H2O (1:1)
Which gas law relates pressure and volume at constant temperature?
Boyle’s Law
Is a solution with pH 3 acidic or basic?
Acidic
What is the law that states matter cannot be created or destroyed in a chemical reaction?
Law of Conservation of Mass
Is NaCl a reactant or product in the reaction: AgNO3+NaCl→AgCl+NaNO3?
Reactant
Calculate the molar mass of CaCO3
100 g/mol
If volume decreases and temperature stays constant, what happens to pressure?
Pressure increases
Which is stronger: acid with Ka=1×10−2 or acid with Ka=1×10−5?
Ka=1×10−2 is stronger
In the reaction N2+3H2→2NH3, what is the mole ratio of H2 to NH3?
3:2
Balance the reaction: C3H8+O2→CO2+H2O
C3H8+5O2→3CO2+4H2O
How many moles are in 88 g of CO2? (Molar mass CO2=44g/mol)
2 moles
Which gas law relates temperature and volume at constant pressure?
Charles’s Law
Which solution has a higher H3O+ concentration: pH 2 or pH 5?
pH 2 has higher H3O+
If the concentration of NO2 increases in the equilibrium N2O4⇌2NO2, which way will the equilibrium shift?
Equilibrium shifts left (toward N2O4)
Identify the reaction type: Zn+CuSO4→ZnSO4+Cu
Single replacement
How many grams of H2O are produced from 3 moles of O2 in the reaction 2H2+O2→2H2O? (Molar mass H2O=18.02g/mol)
108.12 g H2O
If temperature increases at constant volume, what happens to pressure?
Pressure increases
Which has a higher H3O+ concentration: acid with Ka=3×10−3 or acid with Ka=5×10−7?
Ka=3×10−3 has higher H3O+
Balance the reaction and identify the type: Mg+HCl→MgCl2+H2
Balanced: Mg+2HCl→MgCl2+H2, Single replacement
Balance and identify the reaction type for: CaCO3→CaO+CO2
CaCO3→CaO+CO2, Decomposition
Given 2Al+Fe2O3→Al2O3+2Fe, how many grams of iron (Fe) are produced when 54 g of Fe2O3 react? (Molar masses: Fe2O3=160g/mol, Fe=56g/mol)
37.8 g Fe
A sample of gas has a volume of 5.0 L at a pressure of 1.2 atm and temperature 300 K. How many moles of gas are in the sample? (Use R=0.0821 L*atm/mol*K)
0.244 moles of gas
If a base has pH 12, is its H3O+ concentration higher or lower than a base with pH 9?
Base with pH 12 has lower H3O+ concentration
Calculate molar mass of Al2(SO4)3.
342 g/mol