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2 years ago

I NEED HELP PLEASE WITH THESE QUESTIONS :

Chemistry

2 answers:

Vesna [10]2 years ago

8 0

Answer:

They are all thermal energy.

Explanation:

They all use heat.

Luda [366]2 years ago

7 0

Answer:

1. Lighting a match uses chemical energy.

2. The evaporation of water is created from thermal energy.

3. Cooking an egg uses thermal energy to cook.

2. The condensation of water from vapor in the air uses thermal energy.

Explanation:

1. Lighting a match uses chemical energy which is then converted into thermal energy.

2. Evaporating water can be cause by hot items like the Sun which plays the most important role in our water cycle by evaporating water.

3. Cooking an egg uses thermal energy because it take the heat away from the object used to cook with it.

4. The condensation of water from vapor in the air is from cool surfaces.

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Butane is used as a fuel in disposable lighters. Write the Lewis structure for each isomer of butane.

AVprozaik [17]

Answer:

Lewis structure for isomers of butane has been given below.

Explanation:

Butane is a saturated alkane with molecular formula $C_{4}H_{10}$ . Due to different positing of methyl groups, positional isomerism exists in butane.

Butane has two positional isomers with same molecular formula. One is n-butane and another one is isobutane. Lewis structures of these two isomers have been given below.

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2 years ago

What type of bond hold bleaching powder atoms together?

belka [17]

Chemical bond I think?

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3 years ago

An atom has the following electron configuration . 1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2 How many valence electrons does this atom

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2 years ago

Although the element hydrogen is a non-metal, it is located on the left side

Leya [2.2K]

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4 0

2 years ago

A) Faça o balanceamento da reação da hidroquinona com peróxido de hidrogênio. ( C6H4(OH)2(aq) + H2O2(aq) --> C6H4O2(aq) + H2O

Vadim26 [7]

The reaction is (a reação é)

(C6H4(OH)2(aq) + H2O2(aq) --> C6H4O2(aq) + H2O(L) ........(i)

The other reaction given are (A outra reação dada é)

C6H4(OH)2(aq) ---> C6H4(OH)2(aq) + H2(g) .......(ii) ΔH = 177 kJ

2H2O2(aq) ----> 2H2O(l) + O2(g) ..................................(iii) ΔH = -189.3

2H2(g) + O2(g) ----> 2H2O (l) .....................................(iv) ΔH =-572 kJ

We can obtain equation (i) from equation (ii), (iii) and (iv) as

[Podemos obter a equação (i) da equação (ii), (iii) e (iv) como]

equation (i) = equation (ii) + 0.5 X equation (iii) + 0.5 X equation (iv)

[equação (i) = equação (ii) + 0.5 X equação (iii) + 0.5 X equação (iv)]

So ΔH1 = ΔH(ii) + 0.5 X ΔH(iii) + 0.5 X ΔH(iv)

= 177 + 0.5 X (-189.3) + 0.5 X(-572) = -203.65 kJ

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2 years ago