2 years ago

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?

Karo-lina-s [1.5K]

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!

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3 years ago

Which is a diatomic molecule? A)He B)O2 C) NaCl 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

ElenaW [278]

Answer is option C...

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3 years ago

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