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<<<<
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:)
Karen chill,all we are doing is
1.checking
or
2.borrowing answers
KAREN!!!
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
trust me is correct make sure to read the answer they might be wrong
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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 ;)
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anonymous is right but 1 is 30 grams not 60
cheating? Me? neverrrrr besties. But just because- @lost and @trust or correct 😏
As I can see here your saying that it is 'C, A, D, B, D' based on some new rearrangements.
I don't cheat if u don't cheat why you here😎
The lack of trust I have now ✋🏽😭
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.
@Trust Me is correct <333
the last question is 4 not 2 but i’m not very smort and anonymous are right otherwise
Trust me is correct thanks man/ woman
Cheating is cool 😎😎😎
@Trust Me:) I'm checking answers now...
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!!!!!
anonymous is correct except 1 is 30grams
trust me is correct!! thank youuu <33
trust me is right thank you !
Anonymous your rong on 1 it is 30
Thank you!
Thanks DrBob 100%, ganna get more later]
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Thank you so much, @trustme, you are 100% correct 😀
@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.
number 1 was rong i was 30
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Trust me is 100% correct.
make sure to read the answers carefully.
I just took the quiz and got 5/5.
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??
istg bro this is too much for me brain
cheaters
this is a joke
RADAAAAAAAAAAAR wuz ere
thxxxx ssss mmmmmm and it is 30 not 60
thanks trust me!!
um yes thank u but number one is wrong the answer is 30 not 60
somewhat helpful!
Answers:
D
B
D
C
A
Chemical changes affect the chemical structure of a substance.
wasd
@anyomous hah and you think your smart?
..........................
...............
@Trust Me is Right 100%
i got one worng
Thank you “trust me” I appreciate it!
look if you dont cheat then why are you on question llc then if you dont cheat why you here and if you think about if we are not cheating we are just checking our answer to make sure we dont fail so thanks all
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
and thank you
Dr.Bob shut up dude
Anonymous is right I got a 100%😁😁✔️✔️✔️✔️ Thank you
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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
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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90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on nine comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love u
Anonymous
Nov 3, 2021
Naaaaaaaaaaaaaaaaaaaa Bro
I thought you had to add more since he only heated up 30
cheaters!
its
c
b
a
a
a
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.
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!
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