Ask question

Ask question

All categories

3 years ago

15

Which of the following is not considered an aspect of environmental health?

1 answer:

notka56 [123]3 years ago

6 0

The one that isn't considered an aspect of environmental health such as smog<span />

You might be interested in

Given the balanced equation representing a reaction:

julia-pushkina [17]

2 and 3 are not possible because energy cannot be created nor destroyed. In order to break bonds, energy must be absorbed, so 1 is your answer!

6 0

3 years ago

Read 2 more answers

Which of the following is an example of chemical energy being used?

AURORKA [14]

Answer:

(A) Battery in a flashlight

Explanation:

Because the chemicals in the battery are being converted to light and heat energy from the bulb!

8 0

3 years ago

Read 2 more answers

A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 3.5 × 10-4 M in calcium ion and 2.33

natka813 [3]

This is an incomplete question, here is a complete question.

A solution containing CaCl₂ is mixed with a solution of Li₂C₂O₄ to form a solution that is 3.5 × 10⁻⁴ M in calcium ion and 2.33 × 10⁻⁴ M in oxalate ion. What will happen once these solutions are mixed? Ksp (CaC₂O₄) = 2.3 × 10⁻⁹

A. Nothing will happen since both calcium chloride and lithium oxalate are soluble compounds.

B. Nothing will happen Ksp > Q for all possible precipitants.

C. A precipitate will form as calcium oxalate is not soluble to any extent.

D. A precipitate will form since Q > Ksp for calcium oxalate.

Answer : The correct option is, (D) A precipitate will form since Q > Ksp for calcium oxalate.

Explanation :

Concentration of $Ca^{2+}$ = $3.5\times 10^{-4}M$

Concentration of $C_2O_4^{2-}$ = $2.33\times 10^{-4}M$

The equilibrium chemical reaction will be:

$CaC_2O_4\rightleftharpoons Ca^{2+}+C_2O_4^{2-}$

The solubility constant expression for this reaction is:

$K_{sp}=[Ca^{2+}][C_2O_4^{2-}]=2.3\times 10^{-9}$

Now we have to calculate the ionic product for calcium oxalate.

$Q_{sp}=[Ca^{2+}][C_2O_4^{2-}]$

$Q_{sp}=(3.5\times 10^{-4})\times (2.33\times 10^{-4)$

$Q_{sp}=8.2\times 10^{-8}$

From this we conclude that, $Q_{sp}>K_{sp}$ that means a white solid precipitate of calcium oxalate will be formed when the solutions are mixed.

Hence, the correct option is, (D)

4 0

3 years ago

What pressure would have to be applied to a 27.2-mL

torisob [31]

Answer:

27.2atm

Explanation:

Data obtained from the question include:

V1 (initial volume) = 27.2mL

P1 (initial Pressure) = 1atm

V2 (final volume) = 1mL

P2 (final pressure) =?

Since the temperature is constant, the gas is obeying Boyle's law.

Mathematically, Boyle's law is expressed as:

P1V1 = P2V2

1 x 27.2 = P2 x 1

P2 = 27.2atm

The final pressure is 27.2atm.

Therefore, the pressure needed to compress the gas is 27.2atm

7 0

3 years ago

What is the valence number of lithium ?

Svetach [21]

Lithium has one valence electron.

4 0

3 years ago

Read 2 more answers