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likoan [24]
3 years ago
12

When an ice cube melts what happens to the matter that once made up the cube

Chemistry
1 answer:
Vinil7 [7]3 years ago
3 0
Water is whats left so then that evaporates
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Which 4 elements make up the bulk of living matter?
Hitman42 [59]
"<span>Let's start with the basics:  you have probably heard that your body is 90% (or 85% or 95%) water.  In actual fact, water is (probably--unless you are obese) the majority of your body weight--but nowhere near 90%.  The best estimate I have seen is 57% (Body water).  So that puts hydrogen and oxygen in the top four.
 
As I mentioned, extremely obese people can be less than 50% water.  Fat (triglycerides) is composed of carbon, hydrogen, and oxygen.  The majority of the mass of a triglyceride is carbon--chemically it is closely related to biodiesel.  So that puts carbon in the top four.
 
Finally, amino acids which make up proteins (which make up muscle) require nitrogen.  That makes the top four.:  Oxygen, Carbon, Hydrogen, and Nitrogen.
 
But wait!  What about bones?  Aren't they calcium and phosphorous?  Bones are really heavy. 
 
It turns out that calcium and phosphorous are indeed the next two most abundant (by mass) elements in the body, but where nitrogen is about 3% of your body mass, calcium and phosphorous are 1.5% and 1.2% respectively. 
 
You can find the full breakdown of the elemental composition of your body here: <span>Abundance of the chemical elements"

</span></span>
4 0
3 years ago
14) How many molecules are there in 9.34 kg of water?
madreJ [45]

Answer:

Water has 18 grams per mole so 9 grams is 0.5 moles of water. There are 6.022* 10^23 molecules in a mole. Each water molecule contains one oxygen and two hydrogens.

8 0
3 years ago
How many moles of sulfuric acid (H2SO4) are needed to react completely with 6.8 moles of lithium hydroxide (LiOH)? (4 points) 2L
Keith_Richards [23]

Answer:

3.4 mol H2SO4

Explanation:

Took the test

3 0
3 years ago
Carbons from acetyl CoA are transferred to the citric acid cycle. Which is the first round of the citric acid cycle that could p
Zielflug [23.3K]

Answer:

In the third step of the citric acid cycle, the oxidation of isocitrate takes place and one molecule of carbon dioxide is released.

Explanation:

In the first step of citric acid cycle, acetylCoA combines with a four-carbon molecule, oxaloacetate, forming a six-carbon molecule, citrate.

In the second step, the citrate in the presence of enzyme anicotase is converted into isocitrate.

<u>In the third step, the oxidation of isocitrate takes place and one molecule of carbon dioxide is released leaving behind one five-carbon molecule called as α-ketoglutarate. During this step, NAD⁺ is reduced to form NADH. </u>

<u>This is first round of the citric acid cycle that could possibly release a carbon atom originating from this acetyl CoA.</u>

On series of reaction, another carbon dioxide molecule also being relased and oxaloacetate is regenerated again.

7 0
3 years ago
Aluminum metal reacts with aqueous cobalt(II) nitrate to form aqueous aluminum nitrate and cobalt metal. What is the stoichiomet
Lelu [443]

Answer:

the stoichiometric coefficient for cobalt is 3

Explanation:

the unbalanced reaction would be

Co(NO₃)₂+ Al → Al(NO₃)₃ + Co

One way to solve is to build a system of linear equations for each element (or group as NO₃) , knowing that the number of atoms of each element is conserved.

For smaller reactions a quick way to solve it can be:

- First the Co as product and as reactant needs to have the same stoichiometric coefficient

- Then the Al as product and as reactant needs to have the same stoichiometric coefficient

- After that we look at the nitrates . There are 2 as reactants and 3 as products . Since the common multiple is 6 then multiply the reactant by 3 and the product by 2.

Finally the balanced equation will be

3 Co(NO₃)₂+ 2 Al → 2 Al(NO₃)₃ + 3 Co

then the stoichiometric coefficient for cobalt is 3

7 0
3 years ago
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