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3 years ago

How are sublimation and evaporation similar?

Chemistry

1 answer:

I am Lyosha [343]3 years ago

7 0

Answer:

Sublimation and evaporation are similar in that they are both phase changes where a substance changes to a gas...but that's where the similarity ends. Sublimation comes from a solid changing to a gas, and evaporation is liquid changing to a gas.

Explanation:

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What happened to the newt population over many generations

kondor19780726 [428]

Answer:

a sickness aka you know what toke them to a better place

5 0

4 years ago

Calculate the number of hydrogen atoms present in 40g of urea, (NH2)2CO

tekilochka [14]

Answer: There are $16.14 \times 10^{23}$ atoms of hydrogen are present in 40g of urea, $(NH_{2})_{2}CO$ .

Explanation:

Given: Mass of urea = 40 g

Number of moles is the mass of substance divided by its molar mass.

First, moles of urea (molar mass = 60 g/mol) are calculated as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{40 g}{60 g/mol}\\= 0.67 mol$

According to the mole concept, 1 mole of every substance contains $6.022 \times 10^{23}$ atoms.

So, the number of atoms present in 0.67 moles are as follows.

$0.67 mol \times 6.022 \times 10^{23} atoms/mol\\= 4.035 \times 10^{23} atoms$

In a molecule of urea there are 4 hydrogen atoms. Hence, number of hydrogen atoms present in 40 g of urea is as follows.

$4 \times 4.035 \times 10^{23} atoms\\= 16.14 \times 10^{23} atoms$

Thus, we can conclude that there are $16.14 \times 10^{23}$ atoms of hydrogen are present in 40g of urea, $(NH_{2})_{2}CO$ .

7 0

3 years ago

2.44 × 10–2 m by 1.4 × 10–3 m by 8.4 × 10–3 m

e-lub [12.9K]

<span>2.44 × 10–2 m by 1.4 × 10–3 m by 8.4 × 10–3 m
</span>

2.9 x 10-7 m3

7 0

3 years ago

Which of the following experiments would be considered unethical?

ale4655 [162]

Answer:

The answer is C)

Explanation:

Can you please answer my question

I have a horse profile of my white Araiban plz!

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3 years ago

Read 2 more answers

1. Fill in the best answer for each of the following: a) ________________________ is the capacity to do work or to supply heat.

user100 [1]

Answer:

A. Energy

B. Chemical potential

C. Endothermic reaction

D.The law of conservation of mass

E. Transfers of energy

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3 years ago