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3 years ago

with respect to composition, how is the compound made from hydrogen and oxygen different from mixtures of these two elements?

1 answer:

8 0

Each substance in the mixture keeps its own properties and can be easily separated from the mixture. In a mixture of hydrogen and oxygen, molecules of both the gases will exist independently.
The compound on the other hand has properties different from the elements it contains. In water as a compound of hydrogen and oxygen what you will have is molecules of H20.

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What is the hypothetical van't Hoff factor of magnesium nitrate, Mg(NO3)2?

vovangra [49]

Answer:

The hypothetical van't Hoff factor of magnesium nitrate, $Mg(NO_3)_2$ is 3 .

Explanation:

Lets calculate -

$Mg(NO_3)_2\rightarrow Mg^2^+ +2NO_3^-$

We know that ,

$i=\alpha n+(1-\alpha )$

Dissociation should be 100% for the hypothetical vant hoff factor , that is

$\alpha =1$ and $n=3$ for $Mg(NO_3)_2$

Therefore , putting the given values ,

$i=1\times3+(1-1 )$

$i=3+0$

$i=3$

Hence , the answer is 3.

4 0

3 years ago

Pleaseeee helpppp thank youu

Gemiola [76]

Answer:

<h3>Answer: well </h3>

b. a type of gas is evolved ( hydrogen gas )

5 0

2 years ago

Rory answered that absolute zero is 0°K. Is this answer correct? Explain why or why not.

Ierofanga [76]

Answer:

Yes, this answer is correct.

Explanation:

Absolute zero is -273.15 degrees celsius

T= Tc+273.15

T is the kelvin temperature

Tc is the temperature in degrees celsius

substitute;

T= -273.15 + 273.15

T=0 K

5 0

3 years ago

Discuss two physical and two chemical properties of Nitrogen

Zigmanuir [339]

Answer:

Nitrogen gas (chemical symbol N) is generally inert, nonmetallic, colorless, odorless and tasteless. Its atomic number is 7, and it has an atomic weight of 14.0067. Nitrogen has a density of 1.251 grams/liter at 0 C and a specific gravity of 0.96737, making it slightly lighter than air.

Explanation:

7 0

3 years ago

Molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. This is a statement of __________.A) the law of multiple

fgiga [73]

Answer:

The correct answer is B.

Explanation:

The molecule of water has 2 atoms of hydrogen and 1 atom of oxygen.

The ratio of masses are given as:

$2\times 1 g/mol: 1\times 16 g/mol= 1 : 8$

This illustrates the law of definite proportions which is also known as law of constant compositions .

The law states that 'the elements combining to form compound always combine in a fixed ratio by their mass.'

Whereas :

Law of multiple proportion states that when two elements combine with each other to form more than one compounds , the mass of one element with respect to the fixed mass of another element are in ratio of small whole numbers.

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

In a balanced chemical reaction ,total mass on the reactant side must be equal to the total mass on the product side.

Law of conservation of energy states that energy can neither be created nor be destroyed but it can only be transformed from one form to another form.

7 0

3 years ago