All categories

2 years ago

3

Chemistry

1 answer:

Ugo [173]2 years ago

8 0

Answer:

Explanation:

Compounds are substances that are formed by the chemical combination of two or more elements in fixed proportions, while mixtures are substances that are formed by physically mixing two or more substances.

You might be interested in

Which characteristic of O₂ is correct?

barxatty [35]

Answer:

One mole of O₂ weighs 32 g

Explanation:

5 0

1 year ago

What is the oxidation state of Fe(s)

ad-work [718]

The oxidation state is zero for Fe (s)

8 0

3 years ago

How could you demonstrate boiling point?

EleoNora [17]

A light layer of vacuum grease is applied to the rim of the belljar. Water at room temperature is placed inside and the vacuum pump is then used to evacuate the vessel. When the air pressure is reduced to the vapour pressure of water at room temperature the water will begin to boil.

5 0

2 years ago

Calculate the molarity when 135 g of KCl is dissolved to make a 2.50 L solution. Round to two significant digits.

inysia [295]

Explanation:

$\textrm{Molarity of a solution}=\frac{\textrm{Number of moles of solvent}}{\textrm{Volume of solution in Liters}}$

We are given a $2.50L$ solution which contains $135g$ of $KCl$ .

To calculate number of moles of $KCl$ present, we need to find it's molar mass from charts. Molar Mass of $KCl$ is known to be $74.55\frac{g}{Mol}$ .

Number of moles of $KCl$ present = $\frac{\textrm{Given weight}}{\textrm{Molar Mass}}\textrm{ = }\frac{135g}{74.55\frac{g}{Mol}}\textrm{ = }1.81087mol$

Molarity = $\frac{1.81087mol}{2.50L}=0.7243\frac{mol}{L}$

∴ Molarity of given $KCl$ solution = $0.72\frac{mol}{L}$

7 0

2 years ago

Ice, liquid, and water vapor are the three states of water

UNO [17]

This is true. Solid, Liquid, and Gas.

Hope that helps!!

7 0

2 years ago