Unit 9 Exam Review (Powerpoint) Flashcards
In a combustion reaction, the reactants are _____:
oxygen and a hydrocarbon
Which set of symbols and explanations is correct?:
•A: (s) – solid; precipitate
•B: (l) – liquid
•C: (aq) – dissolved in water
•D: All of the aboveD: All of the above
In a double-replacement reaction, the reactants are ____:
2 compounds
A skeleton equation does NOT show ____:
coefficients
Chemical equations must be balanced to satisfy _____:
Conservation of Mass
In a balanced chemical equation, each side of the equation has the same number of ______:
atoms
What type of reaction is: 2C3H7OH + 9O2 –––> 6CO2 + 8H2O ?:
Combustion Reaction
Chemical equations describe ____:
chemical reactions
The first step in most stoichiometry problems is to _______:
convert to moles
In a chemical reaction, the mass of the products _________:
equals the mass of the reactants
In the following reaction: 2CO (g) + O2 (g) –––> 2CO2 (G), what is the ratio of moles of oxygen used to moles of CO2 produced?:
1:2
Which of the following is NOT true about limiting and excess reagents?:
•A: the reactant that has the smallest given mass is the limiting reagent
•B: some of the excess reagent is left over after the reaction is complete
A: the reactant that has the smallest given mass is the limiting reagent
Which of the following is the correct interpretation of the equation … 2S (s) + 3O2(g) –––> 2SO3 (g) ?:
•A: 2 atoms + 3 molecules O2 –––> 2 molecules SO3
•B: 2 g S + 3 g O2 –––> 2 g SO3
•C: 2 moles S + 3 moles O2 –––> 2 moles SO3
•D: Both A and C are correct
D: both A and C are correct
What is conserved in this reaction ... 2S (s) + 3O2 (g) –––> 2SO3 (g) ?:
•A: atoms
•B: mass
•C: moles
•D: liters
•E: both A and B are correctE: both A and B are correct
When two substances react to form products, the reactant which is used up is called the ______:
Limiting reactant
