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GaryK [48]
3 years ago
9

How can endothermic and exothermic reactions help others (society)

Chemistry
1 answer:
AnnZ [28]3 years ago
4 0
Here try this presentation, it should help :) 

https://prezi.com/6ofdo3fadl9a/exothermic-and-endothermic-reactions-in-everyday-life/
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Simplify - Factor a
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Answer:

Option 1

Explanation:

Option number 1 is the most compact one which indicates it is a solid

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2 years ago
What happens chemically when quick lime is added to water?
sineoko [7]

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CaO + H20 => Ca(OH)2

Explanation:

quick lime ia a oxyde and when it reacts with water it gives hydroxide

5 0
2 years ago
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What is the approximate percent by mass of potassium in KHCO3?
lozanna [386]

Answer:

The mass percent of potassium is 39%

Option C is correct

Explanation:

Step 1: Data given

Atomic mass of K = 39.10 g/mol

Atomic mass of H = 1.01 g/mol

Atomic mass of C = 12.01 g/mol

Atomic mass of O = 16.0 g/mol

Step 2: Calculate molar mass of KHCO3

Molar mass KHCO3 = 39.10 + 12.01 + 1.01 + 3*16.0

Molar mass KHCO3 = 100.12 g/mol

Step 3: Calculate mass percent of potassium (K)

%K = (atomic mass of K / molar mass of KHCO3) * 100%

%K = (39.10 / 100.12) * 100%

%K = 39.05 %

The mass percent of potassium is 39%

Option C is correct

8 0
3 years ago
Write a hypothesis statement about the relationship between the number of mushrooms and the concentration of heavy metals in the
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Answer:

Write a hypothesis statement about the relationship between the number of mushrooms and the concentration of heavy metals in the soil ...


8 0
2 years ago
You are carrying out an experiment in the lab to study the glycolysis pathway. To do this, a liver extract (which is capable of
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[See the image attached].

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When C1 is labeled in glucose, it ends up in the carboxyl group of pyruvate.

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