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Over [174]
2 years ago
14

The primary goal of water-softening ion exchange systems is _____(1 point)

Chemistry
1 answer:
Anettt [7]2 years ago
5 0

Answer:

The primary goal of water-softening ion exchange systems is _____(1 point)

removing magnesium and calcium from water. ***

removing sodium from water.

introducing magnesium and calcium into water.

introducing sodium into water.

How does a reverse osmosis water purification system operate? (1 point)

Untreated water is subjected to high pressure, causing it to move through a highly permeable membrane, which captures contaminants.

Untreated water is subjected to high pressure, causing it to move through a semi-permeable membrane, which captures contaminants. ***

Untreated water is subjected to low pressure, causing it to move through a highly permeable membrane, which captures contaminants.

Untreated water is subjected to low pressure, causing it to move through a semi-permeable membrane, which captures contaminants.

A city council is debating between two potential water purification systems: reverse osmosis and ion exchange. Cost is the primary criteria for the choice. Which decision is the most likely result of this debate?(1 point)

More research is needed because reverse osmosis systems require specialized maintenance, while ion exchange requires regular replacement of components. ***

A reverse osmosis system would likely be chosen because it does not require specialized maintenance or regular replacement of components.

More research is needed because ion exchange systems require specialized maintenance, while reverse osmosis requires regular replacement of components.hdhdhd

An ion exchange system would likely be chosen because it does not require specialized maintenance or regular replacement of components.

A city council is debating different alternatives for purifying water from a local reservoir. The council is considering ion exchange and reverse osmosis. Bacterial contamination of the water supply is the primary concern, and the council has decided that dealing with this is the main criteria for their choice. Which decision is the most likely outcome of this debate?(1 point)

They are likely to choose reverse osmosis because it is specifically designed to kill bacteria.

They are likely to choose ion exchange because it is specifically designed to kill bacteria.

They are likely to choose reverse osmosis because it addresses a wider range of problems, including bacteria. ***

They are likely to choose ion exchange because it addresses a wider range of problems, including bacteria.

Which of the following is a constraint of a chlorine bleach shock to remove contaminants from drinking water?(1 point)

This treatment only removes large solids.

This treatment only removes microscopic contaminants.

This treatment does not remove bacteria.

This treatment removes bacteria, but not other pollutants. ***

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A sample of a pure substance with a density of 3 g/mL is separated into two pieces. One piece has a mass of 50 g and the other p
pshichka [43]

Answer:

8.3ml

Explanation:

to get volume u have to divide 25g over the density, i rounded to the nearest tenth, if you don't want to then write out the full number with all the decimals

4 0
3 years ago
Which of the following describes what happens to the atom that was displaced in the reactant compound during a single replacemen
Marysya12 [62]

Answer: It becomes the uncombined element in the product.

Explanation:

The reaction between Zn and HCl is a single displacement reaction according to equation below

Zn + 2HCl —> ZnCl2 + H2

Zn displaces H2 from acid and in the product, hydrogen became the uncombined element.

3 0
3 years ago
Read 2 more answers
You have a particle of length 68 nm. What is this in meters? ( need help asap)
Bess [88]

Answer:

B

Explanation:

4 0
2 years ago
Draw a correct Lewis structure for XeI2 (Xe in middle, surrounded by I's ) that puts a 0 formal charge on all atoms. How many lo
Alona [7]

1) The Lewis structure will be:

Xe

|

I--I

In this structure, the xenon atom is surrounded by two iodine atoms, which are bonded to it through single bonds. Each iodine atom has one lone pair of electrons, for a total of 2 lone pairs on the central atom (xenon).

2) The molar mass of the gaseous compound is 0.416 g/mol.

To draw a correct Lewis structure for XeI2, we need to first count the number of valence electrons in the molecule. Xenon is a noble gas and has 8 valence electrons, while iodine has 7 valence electrons for a total of 23 valence electrons. To satisfy the octet rule and put a 0 formal charge on all atoms, we can use the following Lewis structure:

Xe

|

I--I

To find the molar mass of the gaseous compound, we can use the ideal gas law:

M = dRT/P

Where M is the molar mass, d is the density, R is the ideal gas constant, T is the temperature, and P is the pressure.

Given that the density of the gas is 0.3876 grams/142 mL = 0.002736 grams/mL, the temperature is 150 + 273 = 423 K, the pressure is 775 torr = 775/760 atm = 1.0132 atm, and the ideal gas constant is 0.08206 L·atm/mol·K.

We can calculate the molar mass as follows:

M = (0.002736 g/mL) * (0.08206 L·atm/mol·K / (1.0132 atm)) * (423 K)

M = 0.416 g/mol

Learn more about molar mass, here brainly.com/question/12127540

#SPJ4

3 0
1 year ago
The amount of fat recommended for somone with a daily diet of 2000 Calories is 65 g. What percent of the calories in this diet w
Doss [256]

Answer:

29.575%

Explanation:

Data provided:

Calories taken in daily diet = 2000

Recommended amount of fat = 65 grams

Average number of calories for fat = 9.1 calories / g

Thus,

Number of calories in the diet with average number of calories for fat

= Recommended amount of fat × Average number of calories for fat

= 65 × 9.1

= 591.5 calories

Therefore,

the percentage of calories in his diet supplied = ( 591.5 / 2000 ) × 100

= 29.575%

6 0
3 years ago
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