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zloy xaker [14]
3 years ago
10

22. Which one of the following processes has a negative value for AH°?

Chemistry
1 answer:
ss7ja [257]3 years ago
4 0

Answer:

C

Explanation:

A negative deltaH means that the reaction has to give up heat in order to happen. You have to treat deltaH as a reactant. So the question is do you need to add heat to the reactants to make the products. If you do, deltaH is plus.

Heat is required to make a solid go to a gas. deltaH is plus. A is not the answer.

A lot of heat is required for B (something like 400 Kj / mole. Like A, deltaH is plus and B is not the answer.

C: The liquid has to give up heat in order for the this reaction to take place. C is the answer.

D requires heat. It is not the answer.

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My answer was 10 and it’s telling me it’s wrong..what did i do wrong?
Keith_Richards [23]

Answer:

1.586x10^-9

Explanation:

To make a multiplication in scientific notation we need to multiply the coefficients and sum the exponents:

Coefficients: 2.600 * 6.1000 = 15.86

Exponents: -5 + (-5) = -10

The result is:

15.86x10^-10

As the scientific notation must be given with only 1 number in the left of the point:

<h3>1.586x10^-9</h3>

5 0
3 years ago
A cell in the leaf of a corn plant contains more chloroplasts than a cell in the stem of a corn plant. Based on this observation
Alik [6]

Answer:

This question lacks options, the options are:

A). synthesizes more sugar

B). has a higher chromosome count

C). produces fewer proteins

D). uses less carbon dioxide

The answer is A

Explanation:

The chloroplast is an organelle present in the cells of photosynthetic organisms. It is the site where photosynthesis, which is the production of food (sugars) from sunlight energy, occurs.

According to this question, a cell in the leaf of a corn plant contains more chloroplasts than a cell in the stem of the same corn plant. Based on this observation, it can be inferred that the LEAF CELLS WILL SYNTHESIZE MORE SUGARS THAN THE STEM CELL because the more the chloroplast, the higher the photosynthetic rate and subsequently the higher the amount of sugar produced.

8 0
3 years ago
An endothermic reaction occurs when water and ammonium nitrate are combined. Which of the following statements correctly
rosijanka [135]

Answer:

C.Energy is absorbed because the products have more chemical energy than the reactants.

Explanation:

7 0
2 years ago
It refers to a charged particle or atom.
Kay [80]
<h2><u>QUE</u><u>STION</u></h2>

It refers to a charged particle or atom.

<h2><u>CHOI</u><u>CES</u></h2>

<u>A.</u><u> </u><u>molecule</u>

B. bromine

C. potassium

D. sulfur

<h2><u>ANSWER</u></h2>

<h3><u>C</u><u>.</u><u> </u><u>pottasium</u></h3>
7 0
3 years ago
4) People experiencing renal failure (kidney disease) may be forced to use a dialysis machine, where blood is pumped into and ou
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You can make your treatment plans and wishes on what else is happening with your health. Use of machine to help you breathe that names a person you choose to make
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3 years ago
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