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podryga [215]
2 years ago
11

Which of the following characteristics do all of the outer planets have in common? A. They lack moons. B. They are small and den

se. C. They have liquid cores. D. They are mostly made up of hydrogen and helium.
Chemistry
2 answers:
Bogdan [553]2 years ago
8 0
I think the correct answer from the choices listed above is option D. Outer planets are mostly made up of gases and are huge in size. These gases are hydrogen and helium. <span>These outer planets are Saturn, Jupiter, Uranus, and Neptune. Hope this answers the question.</span>
Vlad [161]2 years ago
6 0

Answer:

The answer is D. They are mostly made up of hydrogen and helium.

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HELP PLEASE I HAVE A TEST TODAY AND I DON'T UNDERSTAND ANY OF THIS...
myrzilka [38]

Answer:

About 67 grams or 67.39 grams

Explanation:

First you would have to remember a few things:

 enthalpy to melt ice is called enthalpy of fusion.  this value is 6.02kJ/mol

  of ice  

 it takes 4.18 joules to raise 1 gram of liquid water 1 degree C

 water boils at 100 degrees C and water melts above 0 degrees C

 1 kilojoules is 1000 joules

  water's enthalpy of vaporization (steam) is 40.68 kJ/mol

  a mole of water is 18.02 grams

  we also have to assume the ice is at 0 degrees C

Step 1

Now start with your ice.  The enthalpy of fusion for ice is calculated with this formula:

q = n x ΔH    q= energy, n = moles of water, ΔH=enthalpy of fusion

Calculate how many moles of ice you have:

150g x (1 mol / 18.02 g) = 8.32 moles

Put that into the equation:

q = 8.32 mol x 6.02 = 50.09 kJ of energy to melt 150g of ice

Step 2

To raise 1 gram of water to the boiling point, it would take 4.18 joules times 100 (degrees C)  or 418 joules.

So if it takes 418 joules for just 1 gram of water, it would take 150 times that amount to raise 150g to 100 degrees C.  418 x 150 = 62,700 joules or 62.7 kilojoules.

So far you have already used 50.09 kJ to melt the ice and another 62.7 kJ to bring the water to boiling.  That's a total of 112.79 kJ.

Step 3

The final step is to see how much energy is left to vaporize the water.

Subtract the energy you used so far from what you were told you have.

265 kJ - 112.79 kJ = 152.21 kJ

Again q = mol x ΔH (vaporization)

You know you only have 152.21 kJ left so find out how many moles that will vaporize.

152.21 kJ = mol x 40.68  or   mol = 152.21 / 40.68  = 3.74 moles

This tells you that you have vaporized 3.74 moles with the energy you have left.

Convert that back to grams.

3.74 mol   x  ( 18.02 g / 1 mol ) = 67.39 grams

5 0
2 years ago
A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The carbon di
Phoenix [80]

Physical and chemical changes are reversible and nonreversible changes. The release of carbon dioxide gas indicates a chemical change.

<h3>What is a chemical change?</h3>

A chemical change is a change in which a new substance is produced when the reactants react in the reaction mixture. The chemical produced cannot be reversed back to the reactants and hence, it is nonreversible.

The release of carbon dioxide is a chemical change as limestone and hydrochloric acid react with each other chemically and as a result, a new substance was formed.

Therefore, the production of carbon dioxide indicates a chemical change.

Learn more about chemical change here:

brainly.com/question/23693316

#SPJ4

5 0
1 year ago
Substance A and substance B combine to form substance C. Three illustrations of 3-D atomic structures of substances: substance A
ANEK [815]

Answer:

To answer this question we need the illustration

Explanation:

You have left the question incomplete since we do not have the illustration making this impossible to answer

8 0
2 years ago
Read 2 more answers
Which group of coefficients balances the following chemical equation? 2KCIO3 → _KCI + _O2 a 1, 3 b 2,2 C 2,3 d 2.1 e 1, 1​
Mars2501 [29]

Answer:

2KClO3 = 2KCl + 3O2

I hope it's helps you

7 0
3 years ago
A sample from one of Earth's oceans has a salinity of 34. What is the concentration of dissolved salts in this sample of seawate
11Alexandr11 [23.1K]

Answer:

Concentration of dissolved salts = 34,038.76 ppm

Explanation:

Given:

Salinity of ocean water = 34

Find:

Concentration of dissolved salts

Computation:

Salinity of ocean water = 34 g/l

1g/l = 1001.14 ppm

Concentration of dissolved salts = 1001.14 ppm x 34

Concentration of dissolved salts = 34,038.76 ppm

3 0
3 years ago
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