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I am Lyosha [343]
2 years ago
7

Which of the following is an example of a chemical reaction?

Chemistry
1 answer:
FrozenT [24]2 years ago
6 0
All of the above are chemical reactions.
If that is a choice 
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Explain why the Earth is constantly undergoing change? *
ElenaW [278]

Real quick, I will tell you why i think it does from a scientific point of veiw, but I dont know for sure.

The reason that the Earth goes through so much change on a regular basis is because of Gravity. What Gravity is doing is pulling objects to the Earth that it can reach (Which you probably knew) and so when it does this, it is pulling at the earths surface as well, causing constant change.

I hope this helps you!

4 0
3 years ago
Read 2 more answers
How many atoms are in 4.5 moles of Cu
sergeinik [125]

Answer:

4,5*6,02*10^23

Explanation:

The moles seem always complex topic but not in fact,

Consider that

1 mole of apple is 1 * 6,02*10^23

Same as 1 dozen of apple is 1 * 12

7 0
3 years ago
The temperature at which the vapor pressure of a liquid is equal to normal atmospheric pressure is the _______. A. boiling point
timurjin [86]

Answer:

A. boiling point

Explanation:

The correct answer is;

A. boiling point

The boiling point of a liquid is the temperature at which the vapour pressure is equal to the atmospheric pressure.

B. melting point

This option is wrong because the melting point is the temperature at which a solid undergoes a phase change to a liquid.

C. freezing point

This option is wrong because the freezing point is the temperature at which a liquid undergoes a phase change to a solid.

8 0
3 years ago
What is the density of 2 mol of (He) at STP? (Show work and explain, please!!!)​
Svetradugi [14.3K]

Answer:

d = 1.8 × 10⁻⁴ kg/L

Explanation:

Given data:

Moles of helium = 2 mol

Temperature and pressure = standard

Density = ?

Solution:

PV = nRT

V = nRT/ P

V = 2 mol × 0.0821 atm. L/ mol. K × 273 K / 1 atm

V = 44.8 L

Mass of helium:

Mass = number of moles  × molar mass

Mass = 2 mol × 4 g/mol

Mass = 8 g

Mass = 0.008 kg

Density;

Density = mass/ volume

d = 0.008 kg/ 44.8 L

d = 1.8 × 10⁻⁴ kg/L

7 0
3 years ago
Twenty is the _________________ of potassium.
AlexFokin [52]
Your answer would be D because 20 is the number of neutrons in postassium!
4 0
2 years ago
Read 2 more answers
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