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3 years ago

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

Chemistry

1 answer:

Nastasia [14]3 years ago

8 0

Answer:

A chemical change is required to separate the elements present in it.

Explanation:

The only true statement from the choices given is that water as a pure substance requires a chemical change to separate the elements present in it.

Water is a molecule consist of two atoms of hydrogen and one atom of oxygen.

The atoms are covalently bonded together.
A chemical process, the electrolysis of water is often used to separate the atoms of a water.
Physical changes cannot be used to separate the atoms of water.
Water is a compound which consists of two elements.

Therefore, we see that only the first choice satisfies this problem.

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How many formula units make up 36.0 g of magnesium chloride (MgCl2)?

zalisa [80]

Answer: There are $2.29\times 10^{23}$ formula units

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{36.0g}{95g/mol}=0.38moles$

1 mole of $MgCl_2$ contains = $6.023\times 10^{23}$ formula units

Thus 0.38 moles of $MgCl_2$ contains = $\frac{6.023\times 10^{23}}{1}\times 0.38=2.29\times 10^{23}$ formula units

Thus there are $2.29\times 10^{23}$ formula units

6 0

3 years ago

One of a frogs biggest defense is a. Eyesight b. Camoflauge c. Ability to swim

Serhud [2]

Answer:

Your answer has to be B. Camouflage

Explanation:

3 0

2 years ago

A Solute is the part of the mixture that is<br> A. dissolved<br> B.used to dissolve a substance

8_murik_8 [283]

It is the thing being dissolved!!

5 0

3 years ago

The reaction below can be catalyzed by bromine (Br2). if you carried out such a reaction, which compound would you expect to fin

Vika [28.1K]

The answer is Br₂ since catalysts are regenerated at the end of a reaction.

3 0

3 years ago

Diamonds are measured in carats, and 1 carat=0.200g. The density of diamond is 3.51g/cm^3. What is the volume of a 5.0-carat dia

const2013 [10]

Convert the amount of substance in carat to grams.
(5.0 carat) x (0.200 g / 1 carat) = 1 g
The volume of the substance is obtained by dividing the mass by the density,
v = m / d
v = 1 g / (3.51 g/cm³) = 0.2849 cm³
Therefore, the volume of a 5.0 carat diamond is approximately 0.285 cm³.

7 0

3 years ago