Chemistry 4.0

Question 1

What is an enzyme?

Answer 1

A chemical reaction that is in a living thing.

Question 2

define the law of conversation of mass?

Answer 2

state of matter that can’t be destroyed or created in a chemical reaction

Question 3

what is a closed system

Answer 3

where materials are not allowed to enter or leave

Question 4

what is an open system

Answer 4

when materials are allowed to leave and enter

Question 5

define chemical reaction

Answer 5

takes place when 2 or more substances combine to form new substances

Question 6

define exothermic reaction

Answer 6

chemical reaction that releases heat energy

Question 7

define endothermic reaction

Answer 7

chemical reaction that absorbs heat energy

Question 8

how is combustion and corrosion similar

Answer 8

they both react with O2

Question 9

how are comb & corr different

Answer 9

comb- chemical reaction that gives off energy

corr- chemical change in the metal

Question 10

define cellular respiration

Answer 10

chemical reaction that takes place in cells in your body

Question 11

give an example of respiration

Answer 11

food + oxygen - carbon dioxide + water + energy that can be used by living things

Question 12

nitrate formula

Answer 12

NO3-

Question 13

what does a catalyst do

Answer 13

speed up reactions