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TEA [102]
3 years ago
11

What is the correct noble gas configuration for Ba?

Chemistry
1 answer:
kvasek [131]3 years ago
8 0
I think the answer is [Xe] 6s2
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The primary goal of water-softening ion exchange systems is _____(1 point)
Anettt [7]

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. ***

5 0
2 years ago
1. How many moles of LiBr are present in 100 mL of 1.25M LIBr solution?
Svet_ta [14]

Answer:

https://www.webassign.net/question_assets/wertzcams3/appendix.pdf

7 0
3 years ago
What is an ephemeral stream? A)one that flows only after rainfall B) one that flows only in flat lands C) one that is formed onl
kupik [55]

Answer: Option (a) is the correct answer.

Explanation:

The stream that flows during or after the rainfall is called an ephemeral stream. This stream occurs in areas where there is less rainfall or deficiency of moisture.

The stream that flows only in flat lands is called as river.

Mechanical weathering results in the breaking of rocks causes ice wedging.

Chemical weathering results in the change in molecular structure of rocks and soil.

Thus, it can be concluded that option (a) is the correct answer.


5 0
3 years ago
Choose all the answers that apply. What do all cells do? reproduce contain hereditary information have a nucleus break down food
Travka [436]

Answer:

contain hereditary information

break down food into energy

Explanation:

Hereditary information is contained in genes and genes are found inside the cell. This implies that the cell contains hereditary information of organisms. This hereditary information is passed on during cell division from parent to daughter cells.

Metabolism occurs in the cells. The cells use oxygen to break down food materials to produce energy.

5 0
3 years ago
A 1.0-L buffer solution is 0.10 M in HF and 0.050 M in NaF. Which action destroys the buffer? (a) adding 0.050 mol of HCl (b) ad
Volgvan

Answer:

(a) adding 0.050 mol of HCl

Explanation:

A buffer is defined as the mixture of a weak acid and its conjugate base -or vice versa-.

In the buffer:

1.0L × (0.10 mol / L) = 0.10 moles of HF -<em>Weak acid-</em>

1.0L × (0.050 mol / L) = 0.050 moles of NaF -<em>Conjugate base-</em>

-The weak acid reacts with bases as NaOH and the conjugate base reacts with acids as HCl-

Thus:

<em>(a) adding 0.050 mol of HCl:</em> The addition of 0.050moles of HCl produce the reaction of 0.050 moles of NaF producing HF. That means after the reaction, all NaF is consumed and you will have in solution just the weak acid <em>destroying the buffer</em>.

(b) adding 0.050 mol of NaOH: The NaOH reacts with HF producing more NaF. Would be consumed just 0.050 moles of HF -remaining 0.050 moles of HF-. Thus, the buffer <em>wouldn't be destroyed</em>.

(c) adding 0.050 mol of NaF: The addition of conjugate base <em>doesn't destroy the buffer</em>

3 0
3 years ago
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