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sweet [91]
3 years ago
10

Kendra and Jordan gather firewood. The wood is cool to the touch, but the campfire they make warms their hands. Which statement

about this situation is true?
A. The chemical energy in the wood and the oxygen is less than the thermal and light energy released.
B. The chemical energy in the wood and the oxygen equals the thermal and light energy released.
C. The process of burning creates energy.
D. Energy is conserved in all chemical changes except burning.
Chemistry
1 answer:
Free_Kalibri [48]3 years ago
6 0

Answer:

D

Explanation:

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Each period in the periodic table corresponds to an energy sublevel or the principle energy level?
ELEN [110]
Each period in the periodic table corresponds to a principal energy level
6 0
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Elements with similar properties are located
Nataly [62]
Those elements with similar properties are in the same column.
4 0
3 years ago
Why cant chemical changes be reversed
kotykmax [81]

Answer:

Throughout the explanation section, the reason behind the given statement is described.

Explanation:

  • The chemicals thus produced were indeed opposite or separate from the reaction mixture, this same reaction wouldn’t change when it's more balanced than some of the reactants.
  • Another reason is that the development of advanced organisms, as well as chemical alterations, is irreversible throughout nature cant undo the chemical modifications.

4 0
3 years ago
A pure white crystalline compound was found to melt at 112.5-113.0oC when taken on a melting point apparatus, and on further hea
Sergeeva-Olga [200]

According to the question, the determined melting point of the compound is 112.5-113.0oC. When the solidified compound was retried, the melting point was found to be 133.6-154.5oC. This greater range higher than  112°C is caused by reusing samples leads to errors.

A pure sample is known by its sharp melting point. A pure sample does not melt over a large range. We can see this in the predetermined melting points of the pure sample(112.5-113.0oC).

However, reusing a sample introduces errors because the pure sample may become contaminated leading to a larger and higher range of melting point (133.6-154.5oC) which is far above  112°C.

Learn more: brainly.com/question/5325004

8 0
2 years ago
A chemist measures the amount of chlorine gas produced during an experiment. She finds that of chlorine gas is produced. Calcula
Trava [24]

Answer:

0.779 moles.

Explanation:

Mass of chlorine/number of moles = molar mass of chlorine.

Molar mass of chlorine = (35.5*2)

= 71 g/mol.

Mass = 55.3 g of chlorine.

Number of moles = 55.3/71

= 0.779 moles.

8 0
2 years ago
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