1.)​CaCO3→CO2​+CaO

Question

A scientist heats 30 grams of calcium carbonate (CaCO3) in the chemical reaction shown. What is the total mass of the products?(1 point)
A.)10 grams
B.)15 grams
C.)60 grams <<<<
D.)30 grams

2.)Fe+O2→Fe2O3​
What happens to atoms of Fe and O2 during the reaction?(1 point)
A.)They are lost.
B.)They are rearranged.<<<<
C.)They maintain their properties.
D.)They gain mass.

3.)What is most likely to occur during a chemical reaction?(1 point)
A.)New atoms are created.
B.)Mass is conserved.<<<<
C.)The original substance maintains its properties.
D.)Molecules of the original substance are lost.

{4.}NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown. Which statement about the reaction is correct?(1 point)
A.)Atoms of Na are destroyed during the reaction.
B.)Some atoms gain mass after the reaction.
C.)There are more H atoms after the reaction.
D.)The atoms of the reactants are regrouped during the reaction.<<<<

{5.}2H2+O2→2H2O
There are four atoms of hydrogen (H) before the reaction. How many atoms of hydrogen are present after the reaction?
(1 point)
A.)8
B.)2
C.)5
D.)4<<<<

Answer 1

1. Nope. You start with 30 g CaCO3. You can't get more total products than you started with.
2. OK
3. OK. But why didn't you use this in answering 1.
4. OK
5. OK

Answer 2

I thought you had to add more since he only heated up 30

Answer 3

and thank you

Answer 4

Add more what?
CaCO3 ==> CaO + CO2
We can calculate grams CaO and grams CO2 produced from 30 g CaCO3, which I will do, but that isn't needed if you remember that the Law of Conservation of Mass says that matter is not created nor destroyed. So if you start with 20 grams CaCO3 you must end up with a total of 30 grams on the other side. mass CO2 + mass CaO = 30 g. But we can prove that's correct by calculating the mass of each and adding them together.
mols CaO = grams/molar mass = 30/100 = 0.3 mols CaCO3
We get 0.3 mol CO2 and 0.3 mol CaO.
grams CO2 = mols x molar mass = 0.3 x 44 = 13.2 g
grams CaO = mols x molar mass = 0.3 x 56 = 16.8 g
g CaO + g CO2 = 16.8 + 13.2 = 30.0
Voila!

Answer 5

oops. I made a typo. If you start with 30 grams CaCO3 you must end up with 30 grams of products. Now I see your reasoning. You're thinking that 30 grams CaCO3 will give you 30 g CO2 and 30 g CaO to make a total of 60 grams but it doesn't work that way. You can see from my calculations how much CO2 and how much CaO are produced. The bottom line is the Law of Conservation of mass. Sorry about the typo. My eye sight isn't that good.

Answer 6

As I can see here your saying that it is 'C, A, D, B, D' based on some new rearrangements.

Answer 7

anonymous is right but 1 is 30 grams not 60

Answer 8

the last question is 4 not 2 but i’m not very smort and anonymous are right otherwise

Answer 9

The answers to the Chemical Reactions quiz are:
1. 30 grams
2. They are rearranged
3. Mass is conserved
4. The Atoms of the reactants are regrouped during the reaction
5. 4
Hope I could help:)

Answer 10

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Answer 11

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Answer 12

@Trustme is right
Thank you

Answer 13

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Answer 14

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Answer 15

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Answer 16

STOP CHEATING

Answer 17

Karen chill,all we are doing is
1.checking
or
2.borrowing answers

KAREN!!!

Answer 18

1. 30 grams
2. They are rearranged
3. Mass is conserved
4. The Atoms of the reactants are regrouped during the reaction
5. 4
If you every need me always say #Lost also spread love not hate!
LoL karen does needs to chill

Answer 19

Dr.Bob shut up dude

Answer 20

that girl and i don't cheat, if you don't cheat then why are you here and how do you know about this website. Also we are here because our answer need checked or we need to borrow one if we got some wrong so before accusing us of cheating make sure you have all the facts. Your welcome ;)

Answer 21

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Answer 22

Anonymous is right I got a 100%😁😁✔️✔️✔️✔️ Thank you

Answer 23

anonymous is correct except 1 is 30grams

Answer 24

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Answer 25

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Answer 26

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Answer 27

its
c
b
a
a
a

Answer 28

number 1 was rong i was 30

Answer 29

Anonymous your rong on 1 it is 30

Answer 30

Thank you!

Answer 31

Thanks DrBob 100%, ganna get more later]

Answer 32

um yes thank u but number one is wrong the answer is 30 not 60

Answer 33

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Answer 34

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Answer 35

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Answer 36

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Answer 37

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Answer 38

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Answer 39

I don't cheat if u don't cheat why you here😎

Answer 40

cheating? Me? neverrrrr besties. But just because- @lost and @trust or correct 😏

Answer 41

The lack of trust I have now ✋🏽😭

Answer 42

somewhat helpful!

Answer 43

Here are the correct answers 1 is c 2 is c not a 3 is c not d 4 is also c not b 5 is a

Answer 44

1.30 grams
2.they are rearranged
3.mass is conserved
4.The atoms of the reactants are regrouped during the reaction.
5.4
don't listen to Anonymous, I did and I got a 3/5 on my test.

Answer 45

Answers:
D
B
D
C
A

Answer 46

Cheating is cool 😎😎😎

Answer 47

@trustme is right!

Answer 48

Thank you so much, @trustme, you are 100% correct 😀

Answer 49

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Anonymous
Nov 3, 2021

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Answer 50

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100% Thanks ;)

@I don't cheat

"StOp cHeaTiNG"

Bro how did you end up here?!?!
Plus some just check so get your facts checked. :P
Some people are smarter than you so deal with it.
#NO MORE BLASPHEMETH!!!!!

Answer 51

Ty!! I came to check my answers, and I could've gotten 2/5 if it weren't for @Trust Me:)

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Answer 52

i have an apple

Answer 53

I have a pen

Answer 54

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Answer 55

Chemical changes affect the chemical structure of a substance.

Answer 56

wasd

Answer 57

Trust me is 100% correct.
make sure to read the answers carefully.
I just took the quiz and got 5/5.

Answer 58

cheaters!

Answer 59

istg bro this is too much for me brain

Answer 60

yoinks people dont like being told to stop cheating when its going affect your life even if it doesn't right now and dont get me started on that some of us are using it to check our awnsers you dont ya just cheat have fun working at McDonald's

Answer 61

@anyomous hah and you think your smart?

Answer 62

hiii,trust me is correct and who ever called us cheaters i have a question since you posted your comment recently, why were you on this site unless you were cheating too??

Answer 63

..........................

Answer 64

...............

Answer 65

cheaters

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Answer 66

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Answer 67

i got one worng

Answer 68

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Answer 69

@anny;oa

... well even if people are cheating why are you complaining about it? it's not your business it's their choices, and I doubt anyone would end up working at McDonalds, some people just can't understand the subject so quit being a rude loser.

Answer 70

thxxxx ssss mmmmmm and it is 30 not 60

Answer 71

thanks trust me!!

Answer 72

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Answer 73

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Answer 74

1. 30 grams
2. Mass is conserved
3. The atoms of the reactants are regrouped during the reaction
4. 4
5. 2H2O2_--> 2H2O+O2