3 years ago

Hey! need help with chem, multiple choice questions.

Chemistry

1 answer:

ladessa [460]3 years ago

7 0

1. 6 carbon atoms and triple bonding between carbons 2 and 3
2. i think it’s 3 but i may be wrong

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How many moles of ethyl alcohol, C2H6O, are in a 16.0 g sample

Anon25 [30]

Moles = mass/molar mass, so n(C2H6O)= 16.0 / (12+12+(1x6)+16)
=0.348 (to correct sig figs)

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The colision of two plates causes the fomation of _____<br> mountain

Zanzabum

The collision of two plates causes the formation of fold mountains.

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A scientist has two substances that she is testing in her lab: a pink

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Answer:

Weaker attraction between its molecules than the green substance. It's molecules now move away from each other.

Explanation:

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Which best identifies the function of fruits?

Naddik [55]

I think it’s A but I’m not sure. Sorry if I’m wrong

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A new grill has a mass of 30.0 kg. you put 1.5 kg of charcoal in the grill. you burn all the charcoal and the grill has a mass o

atroni [7]

The reaction for burning of charcoal or complete combustion is as follows:

$C(s)+O_{2}(g)\rightarrow CO_{2}(g)$

From the above balanced reaction, 1 mole of carbon releases 1 mole of $CO_{2}$ gas.

Converting mass of charcoal into moles as follows:

$n=\frac{m}{M}$

Molar mass of pure carbon is 12 g/mol thus,

$n=\frac{1.5\times 10^{3} g}{12 g/mol}=125mol$

The same moles of $CO_{2}$ is released. Converting these moles into mass as follows:

m=n×M

Molar mass of $CO_{2}$ is 44 g/mol thus,

$m=125mol\times 44 g/mol=5.5\times 10^{3}g$

Converting mass into kg,

$1g=10^{-3}kg$

Thus, total mass of gas released is 5.5 kg.

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3 years ago