Chem Equations
An abbreviation indicating that a substance is dissolved in water during a chemical reaction
What is (aq)?
BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq)
What is a double replacement/displacement reaction, more specifically a precipitation reaction?
The molar mass of Ca3(PO4)2
What is 310.174 g/mol?
Catalysts speed up chemical reactions by decreasing this
What is activation energy?
If calcium carbonate has a solubility in water of 15 mg/L, then this is the type of solution that forms when 30 µg of calcium carbonate is added to 0.5 kL of water
What is an unsaturated solution?
The substances on the right side of a chemical equation
What are products?
C3H8 + 5O2 → 3CO2 + 4H2O
What is a combustion reaction?
This conversion factor is used for EVERY stoichiometry problem
What is mole ratio?
The substance acting as a catalyst in the following reaction: 2KClO3 + MnO2 → 2KCl + 3O2 + MnO2
What is MnO2 ?
The percent concentration of a solution made of 8.5 g NaCl and 122.3 g H2O
(8.5g)/(8.5g+122.3g)= 6.5%
The balanced chemical equation for: CaCl2 + Na3PO4 → Ca3(PO4)2 + NaCl (unbalanced)
3CaCl2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCl
When H2CO3 chemically reacts to form carbon dioxide and water
What is a decomposition reaction?
The mass of sodium sulfide needed to react completely with 60.00 g of silver iodide in the following chemical reaction: 2AgI + Na2S → Ag2S + 2NaI
(60.00g AgI )/ 1* (1 mol AgI) / (234.772 g AgI) * (1 mol Na_2S)/ (2 mol AgI) * (78.046 g Na_2S) / (1 mol Na_2S) = 9.973 g Na2S
Enthalpy of a reaction when the surroundings get colder
What is +ΔH (positive enthalpy)?
This many molecules of sucrose are in 0.75 L of a 0.50 M aqueous sucrose solution
(0.75L)/1*(0.50mol)/(1L)*(6.022*10^23mol ecu l es)/(1mol)= 2.3×1023 molecules
The number of hydrogen atoms indicated on each side of this balanced equation:
6H2O + 2P4 + 3Ba(OH)2 → 2PH3 + 3Ba(H2PO2)2
What is 18?
When aluminum and diatomic oxygen react to form aluminum oxide
What is a synthesis reaction?
The moles of carbon dioxide produced if 3.7 mol diatomic oxygen completely reacted in the following chemical reaction: C3H8 + 5O2 → 3CO2 + 4H2O
(3.7molO_2)/(1)*(3molCO_2)/(5molO_2)=2.2molCO_2
The enthalpy of this reaction: C3H8 + 5O2 → 3CO2 + 4H2O
What is -ΔH (negative enthalpy)?
The molarity of a 560 mL solution containing 35.0 g HCl
(35.0g)/(560mL)*(10^3mL)/(1L)*(1mol)/(36.461g)=1.7 M
The molar ratio of the reactants in the following chemical equation: 8CO + 17H2 → C8H18 + 8H2O
What is 8 mol CO : 17 mol H2 ?
When silver and dihydrogen sulfide react to form silver sulfide and diatomic hydrogen
What is a single replacement/displacement reaction?
If 180.0 g of ethanol (C₂H₅OH) undergoes complete combustion, and the enthalpy change for the combustion of ethanol is ΔH = –1367 kJ/mol, then THIS is the enthalpy change for this reaction in Joules
(180.0 g) / 1 * (1 mol) / (46.069 g) * (-1367 kJ) / (1 mol) * (1000 J) / (1 kJ)=-5,341,000 J
The mass of glucose in 550 mL of a 0.30 molar aqueous glucose solution
(550mL)/1*(1L)/(10^3mL)*(0.30mol)/(1L)*(180.156g)/(1mol)= 29.72574 = 3.0x101g