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kenny6666 [7]
3 years ago
12

Can you identify the 4th most abundant element in the universe?

Chemistry
1 answer:
Ksivusya [100]3 years ago
3 0
Carbon (after hydrogen, helium and oxygen).
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What happens to air pressure as altitude increases
gulaghasi [49]

Answer:

the air pressure decreases

explanation

as altitude increases air pressure decreases the surface of the Earth is bottom of the ocean of the are the layer on top increase pressure so that sea levels a body is under 14.7 pounds of pressure per square inch moving up in altitude decreases weight of the air that causes the pressure

4 0
3 years ago
A chemical test has determined the concentration of a solution of an unknown substance to be 2.41 M. a 100.0 mL volume of the so
Oksana_A [137]

Answer : The molar mass of unknown substance is, 39.7 g/mol

Explanation : Given,

Mass of unknown substance = 9.56 g

Volume of solution = 100.0 mL

Molarity = 2.41 M

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

\text{Molarity}=\frac{\text{Mass of unknown substance}\times 1000}{\text{Molar mass of unknown substance}\times \text{Volume of solution (in mL)}}

Now put all the given values in this formula, we get:

2.41M=\frac{9.56g\times 1000}{\text{Molar mass of unknown substance}\times 100.0mL}

\text{Molar mass of unknown substance}=39.7g/mol

Therefore, the molar mass of unknown substance is, 39.7 g/mol

5 0
3 years ago
Water will melt faster on a very cold soft drink can than it will on a cool soft drink is this physical or chemical change?
Margarita [4]
I believe its chemical change


hope this helps
7 0
4 years ago
Read 2 more answers
What is the relationship between chemical equilibrium and the rates of forward and reverse reaction?
Nataly_w [17]

Answer:

c

Explanation:

the rate of a forward process must be exactly balanced by the rate of the reverse process.

3 0
3 years ago
Read 2 more answers
Please help!!! due soon!
Veseljchak [2.6K]

Answer:

Always stays the same.

7 0
3 years ago
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