Between points 1 and 2, water is a _____. a. gas b. solid c. plasma d. liquid

Introduced sewage in water systems _______. a. decreases levels of phosphorus and nitrogen b. increases oxygen levels c. increas

enyata [817]

Option C: Introducing sewage in water systems increases the concentration of solids.

Sewage is one of the most concerning sources of water pollution. Sewage, in simple terms, is the wastewater that contains compostable materials from the kitchen, industries, bathrooms, etc.

When untreated sewage is introduced into the water bodies, the microorganisms in it take up the oxygen from water for their aerobic respiration. As a result, the resident organisms of the water body have to struggle to survive due to the lack of oxygen in the water.

Sewage also contributes to the eutrophication of water bodies. Eutrophication is the process by which the nutritional elements, like phosphates and nitrates, in a water body, are enhanced causing the microorganisms to feast over them.

Sewage has some solid particles that can't be dissolved or decomposed. This then leads to the concentration of solids at the base of the water body. This further leads to the growth of various organisms using dissolved oxygen and leads to the deterioration of water quality.

To know more about sewage water, refer to the following link:

brainly.com/question/10022625

#SPJ4

8 0

2 years ago

Ionic compounds are formed from ionic bonds, whereby an electron is transferred from the metal cation to the nonmetal anion. Ion

Karolina [17]

Answer:

NaI

Explanation:

In I₂, HI and IBr, both atoms are nonmetals and they form covalent bonds in which electrons are shared.

In NaI, Na is a metal and I a nonmetal, so they form an ionic bond, where Na loses an electron to form Na⁺ and I gains an electron to form I⁻. Anions and cations are attracted to each other through electrostatic forces.

Since ionic bonds are stronger than covalent bonds, more energy is required to break them in the melting process, thus having higher melting points.

All in all, NaI is the one with the highest melting point.

7 0

4 years ago

5. A gas has a pressure of 310 kPa at 237 degrees C. What will its pressure be at 23 degrees C?)

slavikrds [6]

Answer:

The pressure of the gas at 23 C is 179.92 kPa.

Explanation:

Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.

Gay-Lussac's law can be expressed mathematically as follows:

$\frac{P}{T} =k$

Studying two states, one initial 1 and the other final 2, it is satisfied:

$\frac{P1}{T1} =\frac{P2}{T2}$

In this case:

P1= 310 kPa
T1= 237 C= 510 K (being 0 C= 273 K)
P2= ?
T2= 23 C= 296 K

Replacing:

$\frac{310 kPa}{510 K} =\frac{P2}{296 K}$

Solving:

$P2=296 K*\frac{310 kPa}{510 K}$

P2= 179.92 kPa

The pressure of the gas at 23 C is 179.92 kPa.

5 0

3 years ago

What is the concentration of a solution of HBr if 0.40 L is neutralized by 0.20 L of 0.50M solution of LiOH?

marysya [2.9K]

Since the mole ratio is 1 to 1 for this reaction, you can just use M1V1 = M2V2 to solve, given that 1 refers to HBr and 2 refers to LiOH.

M1 = ?
V1 = 0.40 L
M2 = 0.50 M
V2 = 0.20 L

M1(0.40) = (0.50)(0.20)

Solve for M1 —> M1 = (0.50)(0.20)/0.40 = 0.25 M HBr

4 0

3 years ago

If 588 grams of FeS2 is allowed to react with 352 grams of O2 according to the following equation, how many grams of Fe2O3 are p

Rainbow [258]

Answer: The mass of iron (III) oxide produced is 782.5 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)