mock review

Question 1

photosynthesis chemical equation

Answer 1

6CO2 (g) + 6H2O (l) –> C6H12O6 (s) –> 6O2 (g)

Question 2

biofuels definition

Answer 2

biofuels are made by fixing carbon through photosynthesis in short periods of time

Question 3

fossil fuels definition

Answer 3

fossil fuels are made by the decomposition of animal and plant matter over millions of years

Question 4

properties of biofuels

Answer 4

• renewable
• carbon neutral

Question 5

properties of fossil fuels

Answer 5

• non renewable
• significant producers of greenhouse gases specifically CO2

Question 6

examples of biofuels

Answer 6

wood, ethanol, methanol

Question 7

examples of fossil fuels

Answer 7

coal, crude oil, natural gases (methane)

Question 8

advantages of biofuels

Answer 8

inexpensive and release less CO2 compared to fossil fuels

Question 9

advantages of fossil fuels

Answer 9

inexpensive, easy to transport and is convenient, supports industries such as manufacturing and agriculture

Question 10

disadvantages of biofuels

Answer 10

combustion still releases CO2 into atmosphere, uses land suitable for agriculture

Question 11

disadvantages of fossil fuels

Answer 11

oil leaks and coal mine explosions, burning of fossil fuels is damaging to human health and environment

Question 12

fossil fuels in order of increasing output of energy per unit mass

Answer 12

coal, crude oil, natural gas

Question 13

which fossil fuel has the greatest tendency to undergo incomplete combustion and why

Answer 13

coal because it contains impurities that react with oxygen

Question 14

fuel cells definition

Answer 14

fuel cells convert chemical energy directly into electrical energy using a continuous flow of reactants

Question 15

two types of fuel cells

Answer 15

methanol and hydrogen fuel cell

Question 16

periodic trend of electronegativity

Answer 16

decreases down a group increases across a period

Question 17

periodic trend of atomic radius

Answer 17

increases down a group decreases across a period

Question 17

periodic trend of electron affinity

Answer 17

decreases down a group increases across a period

Question 18

periodic trend of ionization energy

Answer 18

decreases down a group increases across a period

Question 19

definition of hybridization

Answer 19

merging of several atomic orbitals

Question 20

definition of pi bonds

Answer 20

covalent bonds formed from the parallel (side to side) overlap of two p orbitals

Question 20

definition of sigma bonds

Answer 20

covalent bonds formed by the overlap of orbitals along the bond axis (end to end)

Question 21

resonance structures

Answer 21

NO3-, CO3 2-. O3, C6H6