Vocab
Exothermic reactions feel...
And why?
Hot, because they release energy!
Na + Cl2 --> NaCl
2, 1, 2
S8 + O2 --> 8S2
Combustion (or synthesis)
What is an ionic bond
A bond between a metal and nonmetal
All acids do what when reacting with water
release hydrogen ions
This is the kind of energy contained in chemical bonds
Chemical energy
H2O --> H2 + O2
2, 2, 1
Zn + HCl --> ZnCl2 + H2
Single displacement
What is a covalent bond?
A bond between two nonmetals
Most bases contain which ion?
hydroxide
This law of conservation is the reason we balance chemical equations
What is the law of conservation of matter
CH4 + O2 --> CO2 + H2O
1, 2, 1, 2
NaNO3 + FeSO4 --> Na2SO4 + Fe(NO3)2
double displacement
A force of attraction between atoms or ions
7
And Why?
Cold...because they absorb energy
CuCl2 + Al --> AlCl3 + Cu
3, 2, 2, 3
During digestion your body uses oxygen (O2) to react with food and enzymes to create water and carbon dioxide
combustion
What happens to the motion of a gas as it is cooled?
It slows down
Is a pH of 3 acidic or basic?
acidic
This is the energy required to begin a reaction
Activation evergy
Pb(NO3)2 + K2CrO4 --> PbCrO4 + KNO3
1, 1, 1, 2
NaOH + HCl --> H2O + NaCl
Neutralization
When going directly from a gas to solid this is called
deposition
How many times more basic is pH 5 than pH 2
105 = 100,000
102 = 100
1000 times more basic