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3 years ago

When heat is removed from a substance, explain how molecules are affected

Chemistry

2 answers:

trasher [3.6K]3 years ago

7 0

I agree the molecules in a substance where the heat is removed will move slower.

sweet [91]3 years ago

4 0

Molecules are cooler so they bocme more dense.. move very slow, have less kinetic energy and are not in random motion.

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What happens in a reduction half-reaction?

Marta_Voda [28]

The answer is elements gain electrons. Oxidation reduction is elements lose electrons. And oxygen is added/lost can be a type of oxidation/reduction reaction.

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3 years ago

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What charge (positive, negative, neutral) does the complete atom<br> have?

Nitella [24]

Answer:

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2 years ago

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How many molecules of co2,h2o,c3h8, and o2 will be present if the reaction goes to completion?

Nadya [2.5K]

Let initially there are 10 molecules of O2 and 3 molecules of C3H8 present

The reaction will be

C3H8(g) + 5O2(g) ----> 3CO2(g) + 4H2O

so here oxygen molecules are limiting as for 3 molecules of C3H8 we need 15 molecules of O2

now the given 10 molecules of O2 will react with only 2 molecules of C3H8 and they will form six molecules of CO2 and 8 molecules of H2O

Hence answer is

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molecules of O2 left = 0

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3 years ago

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Three common ores of iron are FeO, Fe2O3, and Fe3O4. Iron ores are often reduced to elemental iron by heating in the presence of

brilliants [131]

Answer:

Answers are explained below

Explanation:

(a)

Oxidation number of iron :

FeO = +2

Fe2O3= +3

Fe3O4 = +2 and +3 since Fe3O4 is the mixture of FeO and Fe2O3.

(b) FeO + CO ----> Fe (s) + CO2

(c) In a pure iron metallic bond is exist between the particles of Fe. But in the form of ore metals forms ionic bond with the non-metals.

Hence the properties vary.

Yes carbon steel has greater strength than that of pure iron but retains the property of iron because no chemical reaction occurs between carbon and iron.

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So when the percentage of carbon increases its atoms also occupying more and more free places.

And increasing the brittleness. So the iron becomes less ductile.

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3 years ago

If the density of an ideal gas at stp if found to be 0.0902 g/l, what is its molar mass?

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P=0.0902 g/l
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M=vp

M=22.4 l/mol * 0.0902 g/l=2.020 g/mol

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