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3 years ago

Why is cold air cold?

Chemistry

1 answer:

Sholpan [36]3 years ago

4 0

Explanation:

Energy makes molecules in the air move faster and expand, decreasing density. The opposite is true for cold air. Molecules are closer together, and absorb less energy.

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Increasing the temperature gives particles more

vagabundo [1.1K]

Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly

7 0

3 years ago

Read 2 more answers

1. what is hard water.

Y_Kistochka [10]

Answer:

Oh man, the questions are much

Explanation:

1. Hard water is water what has high mineral content. (I can't go into details )

2. River, reservoir, Lake, groundwater, rain

3. H2O

4. POW is the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from water.

5. Reduces amount of chlorine, soil residue, and organic and inorganic substances. Helps in improving the taste. Smell and visual appearance of water.

6. Boiling, filtration, distillation, and chlorination

7. Dust, dirt, harmful chemicals, biological contaminants, radiological contaminants

8. It is the contamination of water bodies, usually as a result of human activities, in such a manner that negatively affects it legitimate uses.

9. Colorless, turbidity, taste And odor.

10. Hardness of water is caused by compounds of calcium and magnesium, and by a variety of other metals.

6 0

3 years ago

Starting with 0.657 g of lead(II) nitrate, a student collects 0.925 g of precipitate. If the calculated mass of precipitate is 0

tatuchka [14]

Answer:

101.2%

Explanation:

Given:

Theoretical yield of the precipitate = 0.914 g

Actual yield of the precipitate = 0.925 g

Now, the percent yield is given as a ratio of actual yield by theoretical yield expressed as a percentage.

Framing in equation form, we have:

$\%\ yield=\frac{Actual\ yield}{Theoretical\ yield}\times 100$

Now, plug in 0.925 g for actual yield, 0.914 g for theoretical yield and solve for % yield. This gives,

$\%\ yield=\frac{0.925\ g}{0.914\ g}\times 100\\\\\%\ yield=1.012\times 100\\\\\%\ yield=101.2\%$

Therefore, the percent yield is 101.2%.

5 0

4 years ago

How many moles of C2H5OH are needed to generate 106.7 g of H2O?

uysha [10]

1.97moles

106.7/(1.01x2+16)/3x1 = 1.97

4 0

3 years ago

A topographical map of a section of Charleston, SC is shown. What feature is located at the dot marked with an X? A) the center

Effectus [21]

It seems that you have missed the given image to answer this question. But anyway, I found it and got the answer. Based on the topographical map of a section of Charleston, SC, the feature that is <span>located at the dot marked with an X is the high point of a hill. The answer would be option D.</span>

6 0

3 years ago