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2 years ago

What are the answers to all of these, I NEED HELP ASAP

Chemistry

1 answer:

Alina [70]2 years ago

4 0

Answer:

well you see here if you add 15+15 it equals 30

Explanation:

please put the question :)

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14. A cinder cone is the simplest type of volcano. a. True b. False

dusya [7]

Answer:

True

Explanation:

They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone, making them the simplest out there

7 0

3 years ago

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Which of the following variables has the least effect on the rate a substance dissolved in a container of water?

Lelechka [254]

I think it’s A. The force of the stirring

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2 years ago

What is the molarity of 555 L of a Ba(OH)2 solution if the pH is 10.20?

Kipish [7]

pH is a symbolic representation of:

$pH=-\log \lbrack H^+\rbrack$

and for water we now that:

$\lbrack H^+\rbrack\lbrack OH^-\rbrack=10^{-14}$

that means the text give us the information to calculate the concentration of protons and therefore the concentration of ions OH-:

$pH=10.2\rightarrow\lbrack H^+\rbrack=10^{-10.2}^{}$

therefore the concentration of OH- can be calculated:

$\lbrack OH^-\rbrack=\frac{10^{-14}}{10^{-10.2}}=10^{-3.8}=1.58\times10^{-4}\text{ M}$

but they are not asking about the concetration of OH- they ask about concentration of Ba(OH)2 and for that we need to know the disolution stechiometry

$Ba(OH)_2\rightarrow Ba^++2\times OH^-$

Whic mean the concentration of Ba(OH)2 is half the concentration of OH-:

$\lbrack Ba(OH)_2\rbrack=\frac{\lbrack OH^-\rbrack}{2}=7.92\times10^{-5}M$

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10 months ago

How does renewable energy differ from nonrenewable energy? 5-6 paragragh

levacccp [35]

Resources are categorized as renewable or non-renewable. A renewable resource may replenish at the rate it is being used, while a non-renewable resource has a limited supply.

Explanation:

Renewable Energy:

It is the energy that is obtained from natural resources like sun, wind, etc..
It is the cleanest form of energy.
15% of the world's total energy depends upon renewable energy.

Advantages of renewable energy:

Renewable energy is free to use and it is available in the abundant quantity.
They produce low carbon emissions and it does not affect the environment.

Dis-Advantages of renewable energy:

The initial step cost much like setting up the windmill and solar panels to obtain energy.
Solar energy needs backup during the winter season.

Non-Renewable Energy

A natural resource or source of energy existing finite quantity and not capable of being replenished.
They are not environmentally friendly and it leads to environmental issues.

Advantages of Non-Renewable Sources:

The Non-Renewable Sources is considered as cheap to use.
They produce a tremendous amount of energy

Disadvantages of Non-Renewable Sources:

Non-renewable sources release toxic gases in the air when burnt which are the major cause of global warming.

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3 years ago

In a nuclear power plant, where are fuel rods found and what function do they perform?

fredd [130]

The fuel rods contain the pellets of uranium dioxide which releases radioactive energy.

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2 years ago

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