18.1 quiz

Question 1

how can you express the rate of a chemical reaction?

Answer 1

it’s how fast reactants turn into products over time

Question 2

list the four factors that can influence the rate of a chemical reaction

Answer 2

temperature, concentration, particle size, catalysts

Question 3

a thin, 0.2 mol sheet of zinc is completely converted to zinc oxide in one month. how would you express the rate of conversion of the zinc?

Answer 3

0.2/30 days = 0.007 mol/day

Question 4

does every collision between reacting particles lead to products? why or why not?

Answer 4

no because the particles might not have enough energy or be aligned correctly to react

Question 5

food stored in a fridge can stay fresh for long periods. why does the same food stored at room temperature quickly spoil?

Answer 5

bacteria and mold grow faster at warmer temps, the cold slows them down

Question 6

make a venn diagram with two circles. label one matter and the other energy. choose a location in the diagram for each factor that can influence the rate of a reaction (temp, concentration, particle size, catalyst) and explain your choices

Answer 6

1. temperature
   ◦ location: energy circle
   ◦ why: more heat = particles move faster = faster reactions
2. concentration
   ◦ location: matter circle
   ◦ why: higher concentration = more particles = higher chance of collision = faster reactions
3. particle size
   ◦ location: matter circle
   ◦ why: smaller pieces = more surface area = more collision = faster reactions
4. catalyst
   ◦ location: overlap
   ◦ why: it lowers activation energy, making it easier for reactions to occur, and it interacts with the reactants

Question 7

what’s an inhibitor?

Answer 7

it gets in the way of a reaction, making it slower or stopping it (opposite of catalyst)

Question 8

Eu

Answer 8

Europium

Question 9

Gd

Answer 9

Gadolinium

Question 10

Tb

Answer 10

Terbium

Question 11

Dy

Answer 11

Dysprosium