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Brums [2.3K]
4 years ago
6

Select the correct answer.

Chemistry
1 answer:
Ivahew [28]4 years ago
7 0
H= energy of product minus energy of reactant

H is endothermic and positive when heat is absorbed

H is exothermic and negative when heat is released

You forgot to attach the diagram but I have an idea of what it might look like. So since the energy of reactant is at a lower level and energy of product is at a higher level, the reaction will be positive.

Answer: C. The difference of the energy of the reactants and the energy of the products.
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Magnetic field
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PLEASE HELP I REALLY CANT FAIL THIS. THIS DETERMINS IF I PASS MY GRADE. What are the most basic building blocks of all organisms
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Answer:

Cells are the basic building blocks of living things.

Explanation:

So the answer is cells because it  is composed of trillions of cells, all with their own specialised function. Cells are the basic structures of all living organisms.

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7 0
3 years ago
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What rate of reaction can be measured in the dark by determining the amount of oxygen gas consumed in a period of time?
Hatshy [7]

The rate of reaction that can be measured in the dark by determining the amount of oxygen gas consumed in a period of time is the rate of respiration.

Why?

Plants can undergo two types of reactions involving oxygen:

  1. <u>Photosynthesis: </u>In this type of reaction, plants use energy from light to synthesize glucose. The chemical reaction for photosynthesis is: 6H₂O + 6CO₂ → C₆H₁₂O₆ + 6O₂, and this reaction produces oxygen gas in the presence of light, that means that to measure the rate of photsynthesis, you'll need to measure the amount of oxgen gas <u>produced</u> in a period of time.
  2. <u>Respiration:</u> In this type of reaction, plants convert the energy stored in the chemical bonds of molecules such as glucose to obtain energy. The chemical reaction for respiration is: C₆H₁₂O + 6O₂ → 6H₂O + 6CO₂, since this reaction consumes oxygen gas in the dark, that means that to measure the rate of respiration, you'll need to measure the amount of oxygen gas <u>consumed</u> in a period of time.

Have a nice day!

7 0
4 years ago
Read 2 more answers
A balanced chemical reaction obeys the law of...
tia_tia [17]
Its c.  Not a 100% sure 
6 0
3 years ago
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3. Which of the following is the correct mathematical expression to use to
xxTIMURxx [149]

Answer:

The pH of a 0.10 Maqueous Ba(OH)2 solution at 25°C is 13.30

Explanation:

The balanced equation is Ba(OH)2(s)→Ba2++2OH−

This indicates that the concentration is 0.2 M

We will find H+ ion concentration

As we know that

[H+][OH−]=1.0×10−14M

Given -  

[OH−]=2.0×10−1M

Putting value of [OH-] in above equation we get -  

[H+]=5.0×10−14M

pH=−log10[H+]

pH=−log10[5.0×10−14] = 13.30.

8 0
3 years ago
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