Unit 8 Flashcards
Which of the following statements is NOT true about what happens in all chemical reactions?
a. The starting substances are called reactants.
b. New atoms are formed as products.
c. The bonds of the reactants are broken and new bonds of the products are formed.
d. The ways in which atoms are joined together are changed.
B.
In every balanced chemical equation, each side of the equation has the same number of ____.
a. atoms of each element
b. moles
c. coefficients
d. molecules
A.
In a chemical equation, (aq) after one of the substances means that it is which of these?
a. released as gas
b. produced from nothing
c. dissolved in water
d. a solid formed from two ionic substances
C.
Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
P + O2 -> P2O5
What do subscripts represent?
Subscripts represent the relative number of each type of atom in a molecule or formula unit.
The _______ system is used for naming compounds.
The International Union of Pure and Applied Chemistry (IUPAC) system is used for naming compounds.
Conservation of matter is represented in _______
Conservation of matter is represented in balanced chemical equation
A coefficient is a quantity that precedes a ____ or _____ formula in a chemical equation and indicates the ______.
A coefficient is a quantity that precedes a reactant or product formula in a chemical equation and indicates the relative number of particles involved in the reaction.
6 major types of chemical equation
- Synthesis
- Decomposition
- Single Displacement
- Double Displacement
- Neutralization
- Combustion
Synthesis
(A + B AB)
Decomposition
(BC B+C)
Single Displacement
(A+BC B+AC)
Double Displacement
(AC+BD AD+BC)
Neutralization
(HX+MOH H2O + MX)
Combustion
CxHy + O2 CO2 + H2O)
Chemical reactions are ______ (heat _____) and _____ reactions (heat _____).
Chemical reactions are exothermic reactions (heat producing) and endothermic reactions (heat absorbing).
Identify what reaction: 2 C2H2 + 5 O2 –> 4 CO2 + 2 H2O
Combustion
Identify what reaction: C3H8 + 5 O2 –> 3 CO2 + 4 H2O
Combustion
Identify what reaction: 3 AgNO3 + K3PO4 –> Ag3PO4 + 3 KNO3
Double Displacement
Identify what reaction: 2 C6H14 + 19 O2 –> 12 CO2 + 14 H2O
Combustion
The equation 2C3H7OH and 9O2 -> 6CO2 + 8H20 is an example of which type of reaction?
Combustion
What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?
2NaBr + I2
The name of the salt formed by the neutralization of hydrochloric acid and sodium hydroxide is —
Sodium chloride
Which of the following best represents the reaction between hydrochloric acid and sodium hydroxide?
NaOH + HCl –> NaCl + H2O
