Where are people exposed to chemicals?O A. Mostly in public buildings
O B. Only in the home
C. Mostly outside
O D. Everywhere

Answers

Answer 1

Answer:

Answer:

I believe the correct answer is D.

Explanation:

You are breathing in dinitrogen and dioxygen. You exhale dinitrogen and carbon dioxide. And the atmosphere contains traces of other gases. You drink water. You have a wash with water, and soap. You eat carbohydrates and proteins. You ride to work on a vehicle powered by hydrocarbons, which spits out carbon dioxide exhaust fumes, and also some nitrogen oxides. And so your exposure to chemicals is pervasive, and unavoidable.

Answer 2

Answer:

Answer:

Explanation:

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Any reaction that absorbs 150 kcal of energy can be classified asa. activated.
b. exothermic.
c. oxidation.
d. endothermic

Answers

The answer should be (D) endothermic reaction.

Reason : - Reactions in which energy is absorbed are called endothermic reactions. In your provided question, 150 kcal energy is being absorbed, and thus, we can say that it is an endothermic reaction.

Which element has an atom in the ground state with a total of three valence electrons

Answers

1) Aluminum
2) Lithium
3) Phosphorus

Not all of the water falls as rain, snow,or sleet evaporates. What happens to the rest of the water?

Answers

Hi there! All of the water returns to the atmosphere, it's called evapotranspiration and condenses. And then the water falls back to the Earth's surface and starts the cycle all over again. If you don't know what I mean, it's the Water Cycle.

The compound NaOH(s) dissolves in water to yield(1) hydroxide ions as the only negative ions
(2) hydroxide ions as the only positive ions
(3) hydronium ions as the only negative ions
(4) hydronium ions as the only positive ions

Answers

Answer: Option (1) is the correct answer.

Explanation:

Sodium hydroxide is a strong base and when it is dissolved in water it completely dissociates into ions.

The chemical equation for this dissociation is as follows.

$NaOH(s) + H_(2)O(l) \rightarrow Na^(+)(aq) + OH^(-)(aq)$

Therefore, we can see that sodium ions are the only positive ions and hydroxide ions are the only negative ions formed upon dissociation of NaOH in water.

Thus, we can conclude that the compound NaOH(s) dissolves in water to yield hydroxide ions as the only negative ions.

A solution contains 35 grams of KNO3 dissolved in 100 grams of water at 40°C. How much more KNO3 would have to be added to make it a saturated solution?(1) 29 g (3) 12 g
(2) 24 g (4) 4 g

Answers

A saturated solution is a solution that can not dissolve any more solute in it. The amount of potassium nitrate that can be dissolved to make a saturated solution is 29 gm.

What is solubility?

The capability of the solute to get dissolved in the solvent to form a saturated solution is called solubility.

The solubility of potassium nitrate in 100 gm of water at 40 degrees celsius is 64 gm. Hence, 64 gm of potassium nitrate is required in 100 gm of water to form a saturated solution.

In the question, the amount of potassium nitrate in 100gm water is 35 gm so, the amount of the potassium nitrate required more will be,

$64 - 35 = 29 \;\rm gm$

Therefore, option (1) 29 gm of potassium nitrate should be added more.

Learn more about solubility here:

brainly.com/question/19419801

The solubility of at 40 C is around 64 g in 100 g water ot 0.64 g KNO3 in 100 g water.

Therefore 64 g KNO3 in 100 g water is required for satured solution.

According to the problem there are 35 grams of KNO3 dissolved in 100 grams water

So we need 64 g-35 g= 29 g more KNO3

Hence the correct answer is 1

Solubility:

When the maximum amount of solute is dissolve in the solvent is called solubility. On the basic of solubility the solution are following types:

Saturate solution:

A solution which contains the maximum amount of dissolved solute at the equilibrium is called saturated solution.

Un-saturate solution:

A solution which contains lesser amount of solute as compare to saturated solution. It will be able to dissolver more solute.

Super -Saturate solution:

A solution which contains the more dissolved amount of solute as compare to saturated solution.

Which of the following would most likely be the characteristics of a desert?O Freezing temperatures and location in higher latitudes
O High temperatures and location in high latitudes
O Moderate temperatures and location in mid to high latitudes
O Warmer temperatures and location around the equator