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Ainat [17]
2 years ago
9

A physical change is ...

Chemistry
1 answer:
AnnZ [28]2 years ago
5 0

Answer:

the answer is c I just took the test

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Hydrogen is an elemental gas why​
d1i1m1o1n [39]

Answer:

hydrogen is a colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas 

Explanation:

Hydrogen is part of the Noble gas family

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3 years ago
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Which energy source has been developed and improved by chemists?
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I’d have to say C. battery.
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2 years ago
Please help me understand how to...
KonstantinChe [14]

Answer:

m_{Cr_2O_3}^{actual}=62.4gCr_2O_3

Explanation:

Hello!

In this case, according to the reaction:

4Cr+3O_2\rightarrow 2Cr_2O_3

We can see there is a 4:2 mole ratio between chromium and chromium (III) oxide, this, for the given 56.2 g of chromium, the theoretical yield of the oxide product is computed down below:

m_{Cr_2O_3}^{theoretical}=56.2gCr*\frac{1molCr}{52.0gCr}*\frac{2molCr_2O_3}{4molCr} *\frac{151.99gCr_2O_3}{1molCr_2O_3}  =82.13gCr_2O_3

Now, considering the 76.0-% yield for this reaction, the actual yield turns out:

m_{Cr_2O_3}^{actual}=82.13gCr_2O_3*\frac{76.0gCr_2O_3}{100gCr_2O_3} \\\\m_{Cr_2O_3}^{actual}=62.4gCr_2O_3

Best regards!

3 0
3 years ago
Which is a diatomic molecule?<br><br> A)He<br><br> B)O2<br><br> C) NaCl<br><br> D)CuF2
katrin2010 [14]

Answer:

B. O2

Explanation:

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Both the physical and chemical properites of a substance can change when a substance undergoes a chemical reaction. When a log i
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Answer is option C...
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