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Ronch [10]
4 years ago
14

The elephant toothpaste demonstration was a great example of the use of potassium iodide as "catalyst". Why did Dr. Hartings use

potassium iodide in this demonstration?
To slow down the reaction

To speed up the reaction

To preserve the oxygen in the soap bubbles

To give color to the foam



Ammonia is one of the most produced chemical compounds in the world today. Which of the following is the main real-world use for ammonia? *

2 points

To maintain the level of of nitrogen in the air (78%)

To produce household cleaners

To produce nitric acid

To produce fertilizer for crops
Chemistry
1 answer:
erica [24]4 years ago
3 0

Answer: the correct answer is B

Explanation: Why it is the correct answer is my teacher told me so im helping you

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Astatine-210 has a half-life of 8.08 days. What fraction of a sample of astatine-210 is left unchanged after 16.16 days?
Flauer [41]

Answer:

0

Explanation:

Given parameters:

Half-life  = 8.08days

Unknown:

What fraction is left unchanged after 16.16days = ?

Solution:

The half - life of a substance is the time taken for the half of a radioactive material to decay to half.

 

  Day 0           Day 8.08         Day 16.16

   100%                 50%                 0%        Parent

    0%                     50%                100%     Daughter

After 16.16 days, non of the original sample will remain unchanged.

6 0
3 years ago
An obese man was discovered in his air-conditioned hotel room sitting in a chair in front of the television. The air conditioner
Leno4ka [110]

Answer:

It has been approximately 6 hours after death.

Explanation:

This is because between 2-6 hours after death, the body starts becoming stiff from top to bottom, then spreading to the limbs. Since there is only rigor in his upper body, that would mean that with normal temperature and body conditions, it would be 4 or 5 hours after death. But since he is obese and in cold temperature, there is slower progression of rigor, leading to the maximum time in the first rigor mortis phase, 6 hours.

8 0
3 years ago
A neutral atom has 1 valence electron and its atomic mass is 39. How many
uranmaximum [27]

Answer: I think probaly wrong so probaly dont

listen to me

Explanation:

5 0
3 years ago
Join my Kahoo t<br> Pin-04454287<br><br> join if u like anime
aniked [119]

Answer:

okayy

Explanation:

5 0
3 years ago
The activation energy for a reaction is the energy difference between what two components of a reaction?
lora16 [44]

Answer:

Activation Energy is the Energy that Must be Overcome/reached by Reactants for Products to be formed.

I'd go with the 2nd Option.

4 0
3 years ago
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