Asked by Anonymous

1.)​CaCO3→CO2​+CaO
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<<<<
Answered by DrBob222
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
Answered by Anonymous
I thought you had to add more since he only heated up 30

Answered by Anonymous
and thank you
Answered by DrBob222
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!
Answered by DrBob222
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.
Answered by im not very smort
As I can see here your saying that it is 'C, A, D, B, D' based on some new rearrangements.
Answered by Anonymous
anonymous is right but 1 is 30 grams not 60
Answered by ahhhh
the last question is 4 not 2 but i’m not very smort and anonymous are right otherwise
Answered by Trust Me:)
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:)
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STOP CHEATING
Answered by willy wonka
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1.checking
or
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KAREN!!!
Answered by Lost
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!
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its
c
b
a
a
a
Answered by gracie
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Answered by gracie
Anonymous your rong on 1 it is 30
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Thank you!
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um yes thank u but number one is wrong the answer is 30 not 60
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Answered by no me!
somewhat helpful!
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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
Answered by he he
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.
Answered by Im right ✅
Answers:
D
B
D
C
A
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Anonymous
Nov 3, 2021

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Answered by Anonymous
@Trust Me:) I'm checking answers now...





100% Thanks ;)

@I don't cheat

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Answered by Laundry room
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Answered by soultaker
Chemical changes affect the chemical structure of a substance.
Answered by wasd
wasd
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make sure to read the answers carefully.
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Answered by Anonymous
cheaters!
Answered by kkay
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Answered by Turtleface xbox
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Answered by a person who exists
@anny;oa

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Answered by ADALETA P HAUGHT
thxxxx ssss mmmmmm and it is 30 not 60
Answer
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Answered by who again
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Answered by https://discord.gg/SH4yvVEQcX
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Answered by LuckeyElf1980
1. 30 grams
2. Mass is conserved
3. The atoms of the reactants are regrouped during the reaction
4. 4
5. 2H2O2_--> 2H2O+O2
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