CHEMISTRY HIGH SCHOOL

A lack of sewage structures in overcrowded cities may lead to __________.a. a higher carrying capacity
b. larger urban heat islands
c. poor public health
d. a greater support capacity

Answers

Answer 1
Answer:

A lack of sewage structures in overcrowded cities may lead to poor public health. Therefore, the correct option is C.

A sewage system, also known as a wastewater management system, is a system of pipes, pumping stations, and other accessories used to transport sewage from points of origin to points of treatment and disposal.

Combination sewers are systems that transport sewage from both domestic and storm sources. Due of the significant amounts of storm water that must be transported during wet weather conditions, combined sewers usually are made up of big pipes or tunnels. Public health may suffer in densely populated cities with inadequate sewage systems.

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Answer 2
Answer: A lack of swage structures in overcrowded cities will lead to poor public health, the less structures to hold the mass of peoples sewage will have bacteria in the air causing bacterial infections.   

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A 55.0 g piece of iron at 505 ° C is put into 735 grams of water at 15.0 ° C. What is the final temperature of the water and the iron?

Answers

Answer:

It would be 95.3

Explanation:

A saturated solution of NaNO3 is prepared at 60.°C using 100. grams of water. As this solution is cooled to 10.°C, NaNO3 precipitates (settles)out of the solution. The resulting solution is saturated. Approximately how many grams of NaNO3 settled out of the original solution?
(1) 46 g (3) 85 g
(2) 61 g (4) 126 g

Answers

The answer is 46 g


The explanation :


According to the attached curve of the relation between the temperature and the grams in solutions:


-we can see from the curve that the grams of NaNO3 at 60°C = 126 g


-and the grams of NaNO3 at 10°C = 80 g


-so, To get the grams of NaNO3 settled out of the original solution, we will subtract the grams of NaNO3 at 10°C - the grams of NaNO3 at 60°C


126 g - 80 g = 46 g


∴ the correct answer is 46 g
The answer is (1) 46g. This is related to the solubility curve of the NaNO3. The solubility of NaNO3 under 60 ℃ is 126 g. And the solubility under 10 ℃ is 80 g. So the NaNO3 precipitates is 126-80=46 g.

Q. 8 Normally, the pH of the human body is fixed in a very narrow range between 7.35 and 7.45. Apatient with an acidotic blood pH of 7.3 may be treated with an alkali such as sodium bicarbonate.
Why would this treatment raise the pH of the blood? Can you please explain it?

Answers

correct answer is( respiratory alkalosis) is a primary decrease in  pco2 with or without compensatory decrease  in h2o3 

Final answer:

When a person has acidosis, their blood is too acidic. Sodium bicarbonate, an alkali, can help by producing hydroxide ions that neutralize excess hydrogen ions, which are responsible for the acidity. This action decreases the acidity of the blood, thereby raising its pH.

Explanation:

The human body's pH level is crucial to maintaining good health. When a person has acidosis, the blood is too acidic, and the pH is often less than the normal range of 7.35 to 7.45. Sodium bicarbonate, a type of alkali, can help treat this condition.

Alkalis such as sodium bicarbonate are basic compounds. When they dissolve in water, they produce hydroxide ions (OH-). These ions can neutralize the excess hydrogen ions (H+) in our body, which are responsible for creating an acidic environment. As a result of this neutralization, the amount of H+ in the body decreases, thus leading to an increase in blood pH, making it less acidic (more alkaline).

So, to put it in simpler terms, the sodium bicarbonate raises the blood's pH by reducing the amount of acid in it - making the blood less acidic and more alkaline.

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Which statement explains why the bonds between nonmetals tend to be covalent? The bonds are found to be nondirectional. They have large differences in electronegativity. They have small differences in electronegativity. They have ions that produce an electrostatic pull.

Answers

Correct Answer: They have small differences in electronegativity (statement 3)
Reason: 
The nature of chemical bond between atoms is primarily driven by the electronegativity  difference between constituent atoms. If electronegativity difference between constituent atoms is significantly higher, ionic bond formation is preferred. On other hand, low difference in electronegativity values, favours formation of covalent bond. 

Mercury has a specific gravity of 13.6. how many milliliters of mercury have a mass of 0.35 kg

Answers

The formula for specific gravity is:

Specific gravity = (\rho _(substance))/(\rho _(water))

where \rho _(substance) is the density of the substance and \rho _(water) is the density of water.

The density of water, \rho _(water) = 1 g/mL

Substituting the values in above formula we get,

13.6 = (\rho _(substance))/(1)

\rho _(substance) = 13.6 g/mL

The formula of density is:

density = (mass)/(volume)

The density of mercury is 13.6 g/mL

The mass of mercury is 0.35 kg = 0.35 kg * 1000 (g)/(kg) = 350 g

Substituting the values in density formula:

13.6 g/mL = (350 g)/(volume)

volume = (350 g)/(13.6 g/mL) = 25.73 mL

The amount, in milliliters, of mercury that will have a mass of 0.35 kg would be 25.74 mL.

If the specific gravity of mercury is 13.6, the density can be obtained such that:

Density of mercury = specific gravity of mercury/density of water

The density of water is 1 g/mL. Thus:

Density of mercury = 13.6/1

                              = 13.6 g/mL

Also; density = mass/volume

       volume = mass/density

                    = 350/13.6

                       = 25.74 mL

Thus, the number of milliliters of mercury that will have a mass of 0.35 kg would be 25.74.

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What law determines that chemical equations must be balanced? What does this law say?

Answers

This is seen in the first law of Thermodynamics stating that matter and energy cannot be destroyed nor created.
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