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3 years ago

Select the correct formula for the polyatomic ion.

Chemistry

2 answers:

Helga [31]3 years ago

7 0

The poly atomic ion formula for ammonium would be NH4+

nignag [31]3 years ago

4 0

Answer:

B (NH4+)

For the next one (nitrate ion) it's A (NO3-)

For the last (chromate ion...) it's C (CrO4^2-)

Explanation:

For edge:)

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What mass of nacl is in 0.600 l of 0.250 m solution?

kipiarov [429]

Answer:

8.77 grams NaC

Explanation:

To find the mass of NaCl, you need to (1) use the molarity equation to find moles, then (2) calculate the molar mass of NaCl (via the periodic table), and then (3) convert moles NaCl to grams (via molar mass). The final answer should have 3 sig figs because the given values also have 3 sig figs.

(Step 1)

Molarity (M) = moles / volume (L)

0.250 M = moles / 0.600 L

(0.250 M) x (0.600 L) = moles

0.150 = moles

(Step 2)

Molar Mass (NaCl): 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl): 58.44 g/mol

(Step 3)

0.150 moles NaCl 58.44 g
--------------------------- x ------------------- = 8.77 grams NaCl
1 mole

4 0

1 year ago

How does global warming affect sea levels?

Effectus [21]

Answer:

Explanation:

The heated atmosphere cause glaciers and ice caps to melt causing the sea level to rise

3 0

2 years ago

Which of the following is used to represent each element?

Mumz [18]

Pretty sure it would be formula

5 0

3 years ago

Read 2 more answers

In the reversible reaction: 2NO2 (g) ⇌ N2O4 (g) the formation of dinitrogen tetroxide releases heat and the formation of nitroge

xenn [34]

Answer: Option (B) is the correct answer.

Explanation:

According to Le Chatelier's principle, any disturbance causes in an equilibrium reaction will shift the equilibrium in a direction that will oppose the change.

For example, $2NO_{2}(g) \rightleftharpoons N_{2}O_{4}(g)$

When we increase the temperature then the reaction will shift in a direction where there will be decrease in temperature.

This, means that the reaction will shift in the backward direction.

Thus, we can conclude that if the reaction is at equilibrium and the temperature increases, the equilibrium will shift so that there is more nitrogen dioxide.

7 0

3 years ago

Read 2 more answers

Which of the following is not true? a. The freezing point of sea water is lower than the freezing point of pure water. b. The bo

Anna007 [38]

Answer:

The false statement is b.

The boiling point of a water sample from the Salt Lake is lower than the boiling point of pure water

Explanation:

This excersise refers to colligative properties.

Boiling point refers to the property of boiling point elevation. In a solution of ions, as water sea or water from lakes, the boiling point will be higher than water pure.

It is logical to say that, because these sort of water have ions. Remember that colligative properties depends on the solute particles.

T° boiling solution - T° pure solvent = Kb . m . i

In the freezing point depression, we have the oppossite of boiling point elevation. Freezing point of solution is lower than pure solvent, according to this:

T° freezing pure solvent - T° freezing solution = Kc . m . i

We have to always consider the i, which means Van't Hoff factor, number of ions dissolved in solution. As the i is higher, the freezing point of solution will be lower, and the boiling point of solution will be higher.

They are true statement a and c.

In solution of., [NaCl] = 0.1M, as it is a higher concentration, the molality is also higher than a solution of [NaCl] = 0.05.

As water sample form Salt Lake has certain ions, it is logical to say that the boiling point of this water is higher than boiling point of pure water.

5 0

3 years ago