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Naddika [18.5K]

3 years ago

11

30 Points!!!!!!!!!

1 answer:

Sonja [21]3 years ago

7 0

Negatively-charged ions are anions, formed from nonmetallic elements like OXYGEN and sulfur.

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What is the heat of reaction (AH) of the<br> following?<br> C(s) + O2 (g) --> CO2 (g)

zlopas [31]

Answer:

C co2 2co enthalpy

2 Answers. Ernest Z. The standard enthalpy of formation of carbon monoxide is -99 kJ/mol.

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4 years ago

When the temperature of a substance _____, the motion of the atoms that make up that substance _____.

Mkey [24]

Increase in temperature makes the atoms speed up, and decrease in temperature makes the atoms move slower.

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3 years ago

Carbon dioxide is commonly found as a solid (dry ice) or a gas (carbon dioxide gas). Jeff's teacher asked him to draw models to

Andrei [34K]

Answer: dry ice is a solid which makes it different from a gas

Explanation:

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3 years ago

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How can I calculate the mass percent of carbon, nitrogen and oxygen in caffeine, C8H10N4O2.

Ahat [919]

You must first calculate the total weight of 1 mole of the substance. You do this by finding the molar weights on the periodic table of each of the elements in the compound:

$8(12.01g)+10(1.008g)+4(14.007g)+2(15.999g)=96.08g+10.08g+56.028g+31.998g=194.186g$

So now we take the amount of each element that is given in the compound and divide it by the total mass of the compound:

Carbon: 96.08g

$\frac{96.08g}{194.186g}= 0.49478=49.48$

Carbon = 49.48%

Nitrogen: 56.028g

$\frac{56.028g}{194.186g}=0.28853=28.85$

Nitrogen = 28.85%

Oxygen: 31.998g

$\frac{31.998g}{194.186g} =0.16478=16.48$

Oxygen = 16.48%

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3 years ago

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Serggg [28]

Answer:

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Explanation:

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3 years ago