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love history [14]
3 years ago
10

Which of the changes are physical changes

Chemistry
1 answer:
Orlov [11]3 years ago
3 0

Answer:

boiling, melting, freezing, and shredding.

Explanation:

Some examples.

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What mass of HBO2 is produced from the<br> combustion of 139.5 g of B2H6?<br> Answer in units of g.
aliina [53]

Answer:

m_{HBO_2}=441.8gHBO_2

Explanation:

Hello there!

In this case, since the combustion of B2H6 is:

B_2H_6+3O_2\rightarrow 2HBO_2+2H_2O

Thus, since there is 1:2 mole ratio between the reactant and product, the produced grams of the latter is:

m_{HBO_2}=139.5gB_2H_6*\frac{1molB_2H_6}{27.67gB_2H_6} *\frac{2molHBO_2}{1molB_2H_6} *\frac{43.82gHBO_2}{1molHBO_2}

m_{HBO_2}=441.8gHBO_2

Best regards!

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Haha i’m trying to do the same one i’ll make sure if i find out how too to get back to you!
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Gametes combine in sexual reproduction that creates a fertilized egg that will turn into a ____________.
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