if burning wood causes the energy of the surroundings to increase by 12,000J what is the change in energy of the wood

Answers

Answer 1

Answer: Due to the law of conservation of energy we know that the energy that heated the surrounding had to have come from the reaction which means that the wood (with oxygen since this is combustion) lost 12000J. The change in energy for the wood is negative. I hope this helps. Let me know if anything is unclear.

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When a substance dissolves, it undergoes a chemical change.a. Trueb. False
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The combustion of 1 mole of CO according to the reaction CO(g) + ½O2(g) → CO2(g) + 67.6 kcal gives off how much heat?-67.6 kcal
-1,514 kcal
-33.3 kcal
-135.2 kcal
-none of the above

Answers

Combustion usually occurs when a hydrocarbon reacts with oxygen to produce carbon dioxide and water. Combustion reactions are almost always exothermic CO(g) + ½O2(g) → CO2(g) + 67.6 kcal
base from the reaction, the stoichiometric ratio is 1 mole CO produce 67.6 kcal so the anwer is - 67.6 kcal because is it exothermic

I got 67.6 kcal not -67.6

What proof did you see in the experiment that a chemical reaction took place?

Answers

Answer:

Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change

Please help me with this question number 22

Answers

If I remember correctly 1 Cal (capital C) is equal to 1000 cal (lower case c) where Cal is used in nutrition since 1 cal is actually relatively small. If I am write about that, the answer should be 138Cal (nutritional calories) equals 138000cal. Therefore I think the answer is 138000cal.

I hope this helps. Let me know in the comments if anything is unclear.

In which equation does the term "heat" represent heat of fusion?(1) NaCl(s) + heat -->NaCl(l)
(2) NaOH(aq) + HCl(aq) -->NaCl(aq) + H2O(l) + heat
(3) H2O(l) + heat --> H2O(g)
(4) H2O(l) + HCl(g) -->H3O+(aq) + Cl-(aq) + heat

Answers

The equation where the term heat represents the heat of fusion is NaCl(s) + heat -->NaCl(l).

The heat of fusion is the heat required to break the intermolecular interactions in a solid as it is converted to the liquid. Hence, the process of fusion is the process of converting a solid into a liquid.

Examining the equations shown in the options closely, we will discover that in the equation; NaCl(s) + heat -->NaCl(l), heat is supplied to sodium chloride solid and it is converted to liquid. The heat involved in this process is the heat of fusion.

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Answer:

The answer is 1

Explanation:

Which sentence contains a common allusion?O A. The meeting became extremely tense.
OB. The meeting turned into Waterloo.
O C. The meeting was held in Chicago.
OD. The meeting proceeded despite obstacles.

Answers

The sentence that is a common allusion is:

B. The meeting turned into Waterloo.

All the other choices are not considered as an allusion

What is an allusion?

It is an inferred or roundabout reference to an individual, occasion, or thing or to a piece of another text. Most references rely upon the comprehension that there is a gathering of data that is shared by the essayist and the peruser consequently. the peruser will get the author's referent.

The example of common allusion from the instances given are:

The meeting turned into Waterloo.

Find more information about Allusion here:

brainly.com/question/2427003

Answer:

Explanation:

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced what type of formations?a. the ionosphere
b. the ozone layer
c. banded iron formations
d. stromatolites

Answers

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations.

Answer;

Banded iron formations

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations.

Explanation;

Cyanobacteria are thought to have introduced oxygen into the early atmosphere. This was important because oxygen played a key role in the evolution of eukaryotic organisms creating an ozone layer to shield life from UV rays.
Banded iron layers were formed in sea water as the result of oxygen released by the photosynthetic cyanobacteria. As the photosynthetic organisms released oxygen, the available iron in the Earth's oceans precipitated out as iron oxides.

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