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3 years ago

OMG please help I hate this.

Chemistry

2 answers:

Iteru [2.4K]3 years ago

8 0

I think the correct answer is D

aev [14]3 years ago

8 0

Answer:

A, D

Explanation:

Water evaporates into gas which requires an increased amount of energy.

Not B because: Dry ice and ice undergo sublimation, which is different from evaporation.

Not C because: As a result of the water boiling, the energy in the environment sees an *increase*, rather than a decrease.

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The thin outer layer of Earth, called the crust, contains only 0.50 percent of Earth's total mass and yet is the source of almos

Rzqust [24]

Answer:

The mass of silicon in kilograms in Earth's crust is $7.2729\times 10^{21} kg$ .

Explanation:

Mass of Earth = $5.9\times 10^{21} tons$

(1 ton= 2000 lb)

(1 lb =453.6 g)

1 ton = 2000 × 453.6 g =907,200 g

Mass of Earth = $5.9\times 10^{21}\times 907,200 g=5.3524\times 10^{27} g$

Percentage of earth crust = 0.50%

Mass of earth crust = M

$0.50\%=\frac{M}{5.3524\times 10^{27}}\times 100$

$M=2.6762\times 10^{25} g$

Percentage of the silicon in Earth's crust = 27.2 %

Mass of silicon in in Earth's crust = m

$Si\%=\frac{m}{M}\times 100$

$27.2\%=\frac{m}{2.6762\times 10^{25} g}\times 100$

$m = 7.2792\times 10^{24} g=7.2729\times 10^{21} kg$

1000 g = 1 kg

The mass of silicon in kilograms in Earth's crust is $7.2729\times 10^{21} kg$ .

7 0

3 years ago

Which two letters has the most kinetic energy?<br>W<br>X<br>Y<br>Z

hichkok12 [17]

Answer:

x and y

Explanation:

3 0

3 years ago

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D‑Glucose and L‑glucose are

tensa zangetsu [6.8K]

Answer:

<h3>A. Epimers </h3>

Explanation:

3 0

3 years ago

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Science, please help and thank you!!

lapo4ka [179]

Swings hope this helps

8 0

3 years ago

If 56 grams of notrogen are used up by the reaction, how many grams of amonia will be produced? 1N2+3H2--> 2NH3

djverab [1.8K]

1 mole of N2 produces 2 moles of NH3
OR...
14 x 2 grams of N2 produces 2(14 +3) grams of NH3
1 gram of N2 produces 34/28 grams of NH3
therefore, 56 grams produce (34/28 )x 56 =68 grams of NH3

the answer thus would be 68 grams of NH3

5 0

3 years ago

OMG please help I hate this.​

OMG please help I hate this.