t8

Question 1

chemical reactions can occur at ___________ speeds

Answer 1

different

Question 2

rate of reactants can be measured by how __ one of the reactants is _____ or how _____one of the products is ________

Answer 2

how fast one of the reactants is disappearing or how quickly one of the products is appearing

Question 3

rates can be changed by ________ / changing the __________ / changing the_________,______ or presence if catalyst or inhibitors

Answer 3

stirring,
changing the temperature
changing the surface area or concentration of the reactants

Question 4

catalysts __________ reactions

Answer 4

speed up

Question 5

catalysts themself, ___________ in a reaction

Answer 5

do not change

Question 6

biological catalysts are called

Answer 6

enzymes

Question 7

corrosion is the ______ of metals or rocks in the presence of _____ and _______

Answer 7

oxidation

air and water

Question 8

one common type of corrosion is _____

Answer 8

rusting

Question 9

combustion is highly (gives off heat)____________

Answer 9

exothermic

Question 10

combustion products include: (3+ what always produced

Answer 10

carbon dioxide
water
oxygen
energy is always produced

Question 11

_____dust is the dust produced from the harvesting, drying. handling, storage or processing of barley, wheat, oats, maize etc

Answer 11

grain dust

Question 12

___________ dust means a large surface area of grain is avaliable for composition

Answer 12

fine dust