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3 years ago

Water is a pure substance. Which of the following is true about water?

Chemistry

1 answer:

iogann1982 [59]3 years ago

8 0

Answer: A) a chemical change is required to seperate the elemnts present in it

Explanation:

Water is a compound, since it is the result of combining atoms: hydrogen $H$ and oxigen $O$ . In fact, the chemical formula of water is $H_{2}O$ .

On the other hand, chemically in a compound the atoms must be combined in a fixed ratio by mass. In the case of the water molecule, the ratio is 2:1 (For each oxigen atom there are two hydrogen atoms).

So, if we want to separate the atoms that make up the water molecule, it only will be possible by a chemical change and not by a physical one.

Hence the correct option is A.

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When an acid reacts with a base what compounds are formed?

vazorg [7]

It's usually water and a type of salt take the reaction between hydrochloric acid and sodium hydroxide HCl(aq)+NaOH(aq) yeilds NaCl(aq) and H2O(l)

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3 years ago

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How many grams of carbonic acid were produced by the 3.00 g sample of NaHCO

stellarik [79]

I think the given is 3 g sample of NaHCO3. then if it will be reacted with an acid, it will produce H2CO3.
so the reaction NaHCO3 + HCl --> NaCl + H2CO3

mas of H2CO3 = 3 g NaHCO3 ( 1 mol NaHCO3 / 84 g ) ( 1 mol H2CO3 / 1 mol NaHCO3) ( 62.03 g / 1 mol )
mass of H2CO3 = 2.22 g H2CO3

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3 years ago

Julio earns $300 a week working a summer job. The paycheck he deposits in the bank is for $250. Which of these accounts for the

azamat

Answer:

theirs a $50 tax with the income hes making

Explanation:

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2 years ago

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Is MgS ionic or covalent

Keith_Richards [23]

Answer:

Ionic

Explanation:

Mg has 2 electron in it's outermost orbit, by donating this two electron to Sulfur it get stable mg 2+ electronic configuration while sulfur has 6 electron in it's outermost shell ,so sulfur accept this 2 electron and complete it's octet and become s2–.

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3 years ago

Approximately how many particles are in 2 moles?

schepotkina [342]

Answer:

$1.2\times10^2^4$ particles in 2 moles.

Explanation:

The number of particles that are contained in one mole, the international unit of amount of substance: by definition, exactly 6.022×10²³, and it is dimensionless. It is named after the scientist Amedeo Avogadro.

It is also known as Avogadro's constant.

∴ Number of particles in one mole = $6.022\times10^2^3$

∴ Number of particles in 2 mole = 2 times Number of particles in one mole

∴ Number of particles in 2 mole= $2\times6.022\times10^2^3=12.044\times10^2^3\approx1.2\times10^2^4$

Hence there are $1.2\times10^2^4$ particles in 2 moles.

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3 years ago

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