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andrew11 [14]
3 years ago
5

Every time materials undergo physical or chemical changes..

Chemistry
1 answer:
vovangra [49]3 years ago
7 0
The answer is D 




Hope it helps

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I would say it should be Einstein's famous equation of e=mc^2 which means energy =mass x the speed of light squared. With this equation Einstein showed that energy comes from a mass travelling at the speed of light squared which is a fundamental equation to explain physical phenomena.
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Carbordum is silicon carbide SiC a very hard material used as an abrasive on sand paper and in other applications. it is prepare
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Answer:

4.5 kilograms of silicon dioxide is required to produce 3.00 kg of SiC.

Explanation:

The balanced equation for the reaction between silicon dioxide and carbon at high temperature is given as:

SiO_2+3C\rightarrow SiC+2CO

1 mole silicon dioxide reacts with 3 moles of carbon to give 1 moles of silicon carbide and 2 moles of carbon monoxide.

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Moles of SiC = \frac{3000.00 g}{40 g/mol}= 75 mol

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mass of 75 moles of silicon dioxde:

75 mol\times 60 g/mol=4500 g=4.5 kg

4.5 kilograms of silicon dioxide is required to produce 3.00 kg of SiC.

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If the volume of a gas is 958 mL at 75.0 C, at what temperature would the volume of the gas decrease to 822 mL
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