CHEMISTRY HIGH SCHOOL

What is true about an ocean current that is moving toward the equatorA. Warm
B. Fast
C. Cold
D. Slow

Answers

Answer 1
Answer: Ocean current that is moving toward the equator is cold. The windblown surface currents distribute heat all over the globe through moving the water which is warm away from the equator and the cool water will replace which is from the north and south poles. An example of this is the Gulf Stream which moves warm water towards the Great Britain and Europe.

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The muscles in your body make up about percent of your body weight.

Answers

The muscles in our body make up for 38% - 54% in males and 28% - 39% in females.

Answer:

The answer is 40-50 percent I did it and it was correct.

Explanation:

I would not mind Brainliest pls.

The distance from Earth to the Sun is 1.0 _____.

Answers

The distance from Earth to the Sun is 1.0 Astronomical Unit. The actual distance of the Sun is not fixed, as it varies with the position of the Sun. It has got an elliptical orbit and this is the reason for the change of distance between the Earth and the Sun. I hope this answer helps you. 

A molecule of butane and a molecule of 2-butene both have the same total number of(1) carbon atoms (3) single bonds
(2) hydrogen atoms (4) double bonds

Answers

The correct answer is option 1. Butane and 2-butene have the same total number of carbon atoms. They both have four carbon atoms. They differ in there structure since the latter has double bonds on it. As a result of the different structure, they also have different properties.

Which compound has the highest percent composition by mass of strontium?

Answers

Assuming all the compounds of interest are given. We proceed on the theoretical way of answering this question. Assume 1 gram of each compound. Multiply it by the reciprocal of the molar mass of the compound. Then multiply it by the molar ratio of the Strontium to the compound. Then, multiply it by the molar mass of strontium. Finally divide this answer by 1 gram and multiply by 100. 

9Ammonia is manufactured from nitrogen and hydrogen by the Haber process.
N2(g) + 3H2(g)2NH3(g)
What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen?
A
5.9%
B
17.6%
с
35.3%
D
50.0%

Answers

Answer:

B

17.6%

Explanation:

1. Percentage yield = (Actual yield/theoretical yield) x 100

2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.

3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.

4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.

5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams

6. So percentage yield is (60,000/340,000) x 100 = 17.6

Expressed in proper scientific notation, the number is 0.00213 a 0.213 x 10² b. 2.13 x 10⁻² c. 2.13 x 10⁻³ d. 213 x10⁰

Answers

The proper scientific notation is 2.13 x 10⁻³.
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