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4 years ago

explain why ventilation is very important if there is a risk of exposure to radon gas in your home or school

Chemistry

1 answer:

Phantasy [73]4 years ago

5 0

Radon is a colorless, odorless, radioactive gas. It is also a leading cause of lung cancer. Ventilation is essential.

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Which of the following is a heterogeneous mixture?

masya89 [10]

The answer would be c a jar of mixed nuts.

8 0

3 years ago

Read 2 more answers

Name the following ionic compounds: (a) K2Cr2O7, (b) Li2C2O4, (c) CuNO3.

Elis [28]

Answer :

(a) The name of $K_2Cr_2O_7$ is, potassium dichromate.

(b) The name of $Li_2C_2O_4$ is, lithium oxalate.

(c) The name of $CuNO_3$ is, copper nitrate.

Explanation:

Ionic compound : It is a type of compound that is made up of the ions of the two different elements in which one element is a metal and another element is a non-metal.

(a) $K_2Cr_2O_7$

The given compound $K_2Cr_2O_7$ is an ionic compound. It is made up of two different ions which are potassium ion $(K^+)$ and dichromate ion $(Cr_2O_7^{2-})$ .

So, the name of $K_2Cr_2O_7$ is, potassium dichromate.

(b) $Li_2C_2O_4$

The given compound $Li_2C_2O_4$ is an ionic compound. It is made up of two different ions which are lithium ion $(Li^+)$ and oxalate ion $(C_2O_4^{2-})$ .

So, the name of $Li_2C_2O_4$ is, lithium oxalate.

(c) $CuNO_3$

The given compound $CuNO_3$ is an ionic compound. It is made up of two different ions which are copper ion $(Cu^+)$ and nitrate ion $(NO_3^{-})$ .

So, the name of $CuNO_3$ is, copper nitrate.

4 0

3 years ago

Which of the following is true about homogeous mixtures

sergey [27]

Was there supposed to be a picture?

4 0

3 years ago

How many moles of water would you have if you had 3x10^24 molecules of

goldfiish [28.3K]

I am going to be honest i’m good at chemistry but i need the point cause i need help on my history work

5 0

3 years ago

The molal boiling point elevation constant Kb = 1.97 C .Kg.Mol-1 for a certain substance X. When 31.98 g of urea are dissolved i

Ipatiy [6.2K]

Answer:

Boiling point of pure liquid is 135.4°C

Explanation:

The boiling point elevation (Colligative property of solutions) follows the formula:

ΔT = Kb×m×i

ΔT is equal to increase in boiling point (Boililng point solution - boiling point pure liquid), Kb is boiling point elevation constant of the liquid, m is molality of solution and i is Van't Hoff factor.

Molality of solution (Moles urea / Kg X):

Moles urea: 31.98g * (1mol / 60.06g) = 0.53247 moles

-60.06g/mol = Molar mass urea-

In 650g = 0.650kg:

0.53247 moles urea / 0.650kg = 0.8192m

Van't Hoff factor of urea is 1

Replacing in the equation:

ΔT = Kb×m×i

ΔT = 1.97°CKgMol⁻¹×0.8192m×1

ΔT = 1.6

As the solution boils at 137°C:

ΔT = Boililng point solution - boiling point pure liquid

ΔT = 1.6°C = 137.0°C - boiling point pure liquid

Boiling point of pure liquid is 135.4°C

8 0

4 years ago