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3 years ago

Carbon is a synthetic element and is not normally found in nature. True or False

Chemistry

1 answer:

Inessa05 [86]3 years ago

6 0

False. Carbon is definitely one of the 92 naturally occurring elements within the periodic table.

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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

Which substance can not be broken down by a chemical change?

frosja888 [35]

(4) Zirconium
This element is often used in the chemical production field, and as implants due to its high chemical resistance and stability.

8 0

2 years ago

Formula for the compound that contains Mg2+ and O2-

jeka94

Answer:

MgO.

Explanation:

charges of both satisfy one another (balanced) -- producing a compound MgO.

7 0

2 years ago

Which of the following are likely to form a covalent bond?

Alex17521 [72]

C) hydrogen and oxygen atoms

5 0

2 years ago

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An aqueous solution of sodium

DochEvi [55]

Answer:

2.5×10^-7mol/dm^3

Explanation:

Firstly convert the cm^3 to dm^3

200×1000=200000dm^3

Calculate the g/dm^3

2/200000=0.00001g/dm^3

To calculate mol/dm^3

Mol/dm^3=mass given\molar mass

=0.00001/40

=2.5×10^-7mol/dm^3

8 0

2 years ago

Read 2 more answers