Question

Is this C?

Answer 1

good, c

Answer 2

C

Answer 3

C isn't balanced (notice how there's 4 atoms of O on the left and 2 on the right)

Answer 4

which equation has the same # of hydrogens + oxygens on each side?

Answer 5

A

Answer 6

not quite

keep in mind the subscript only applies to the atom to the left of it

so H2O means 2 hydrogens + 1 oxygen

so for A) there would be 2 hydrogens + 2 oxygens on the left side but only 1 oxygen on the right side

Answer 7

b then because 2 hydrogens on each side?

Answer 8

2H2 would be 4 hydrogen atoms since you have 2 molecules of hydrogen with 2 hydrogen atoms each

Answer 9

which eliminates everything except D

Answer 10

B

Answer 11

B would be reactants not products, any other ideas?

Answer 12

D then

Answer 13

Ugh I dont want to guess

Answer 14

stuck between d and c

Answer 15

"ingredients" would be something you put into the reaction, so C would describe the reactants

products are the things produced, so D

Answer 16

SO d =)

Answer 17

yes

Answer 18

B

Answer 19

a cold pack makes things colder, which means it's absorbing energy from the enviornment

what kind of reaction would this be?

Answer 20

A

Answer 21

good

Answer 22

C

Answer 23

good

Answer 24

A

Answer 25

try to compare these graphs to your problem to see which description fits better

Answer 26

C

Answer 27

well done

Answer 28

A

Answer 29

a car's engine gives off heat so that would be exothermic

which reaction requires you to put heat in?

Answer 30

heating pad

Answer 31

a heating pad also gives off heat, so that's also exothermic

any other ideas? which one requires more heat/energy to be put in than it gives off?

Answer 32

NO actually D

Answer 33

as a general rule burning something is almost always exothermic

so cooking an egg = C = your answer

Answer 34

Cause dont you have to build a fire in order to burn wood

Answer 35

ughhhh afkkafjajw

Answer 36

I dont want to guess, could you explain this to me

Answer 37

CO2 + H2O are the products of combustion so C

you just have to know this by memory

Answer 38

A

Answer 39

that's not necessarily true, for example one substance can be decomposed into to

it would be the # of atoms since those are re-arranged but not created/destroyed (B)