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3 years ago

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Assessment timer and count Assessment items Item 3 What condition would most likely cause a decrease in the salinity of ocean wa

ter? freezing of glaciers extremely hot weather high rates of evaporation a river flowing into the sea

1 answer:

Goryan [66]3 years ago

3 0

Answer:

it's a river flowing into the sea

Explanation:

i had it on a quiz for k12 on god it's the good one have a good day

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2. In Experiment SOL, you investigated the solubility of oxalic acid. Sodium oxalate, Na2C2O¬4, is the sodium salt of this acid.

AnnZ [28]

Answer:

Sodium oxalate is a basic salt. In water it can be dissolved and dissociated.

The oxalic acid in water has two dissociations.

Explanation:

Na2C2O4 ---> 2Na+ + C2O4-2

Sodium oxalate is the conjugate base of a weak acid. In water this salt, dissociates completely giving rise to the sodium and oxalate ions. As Na+ comes from a strong base, in water it does not produce hydrolysis while oxalate does react in water, because it takes a proton from it and it generates a basic hydrolysis releasing OH-.

C2O4-2 + H2O ⇄ HC2O4- + OH-

In water the salt is basic. The pH of an aqueous solution of this salt is basic, since OH- is generated.

The HC2O4- has a second hydrolisis, it takes another proton from water to form oxalic acid.

HC2O4- + H2O ⇄ H2C2O4 + OH-

The oxalic acid acts as a weak acid, it can release 2 protons to water, to make oxalate (its conjugate base).

H2C2O4 + H2O ⇄ H3O+ + HC2O4-

HC2O4- + H2O ⇄ H3O+ C2O4-2

The HC2O4- acts as an ampholyte since it accepts and delivers protons simultaneously.

6 0

3 years ago

Consider separate 1.0-L samples of He(g) and UF6(g), both at 1.00 atm and containing the same number of moles. What ratio of tem

diamong [38]

V = \sqrt{x} 3 * R * T / MW

V = RMS velocity

R = 8.3145 J/K*mole

T = Temperature K

MW = Molecular weigh in Kg

3 0

3 years ago

What is the molarity of a solution containing 55.8 g of mgcl2 dissolved in 1.00 l of solution?

MakcuM [25]

The answer is 0.59 M.

Molar mass (Mr) of MgCl₂ is the sum of the molar masses of its elements.
So, from the periodic table:
Mr(Mg) = 24.3 g/l
Mr(Cl) = 35.45 g/l
Mr(MgCl₂) = Mr(Mg) + 2Mr(Cl) = 24.3 + 2 · 35.45 = 24.3 + 70.9 = 95.2 g/l

So, 1 mol has 95.2 g/l.

Our solution contains 55.8g in 1 l of solution, which is 55.8 g/l

Now, we need to make a proportion:
1 mole has 95.2 g/l, how much moles will have 55.8 g/l:
1 M : 95.2 g/l = x : 55.8 g/l
x = 1 M · 55.8 g/l ÷ 95.2 g/l ≈ 0.59 M

7 0

2 years ago

Read 2 more answers

What number is equal to the amount of protons<br> and neutrons on the periodic table?

DENIUS [597]

Answer:

The mass number

Explanation:

The mass number of an atom is its total number of protons and neutrons.

I hope this helps a bit.

7 0

3 years ago

What is the formula for dinitrogen pentoxide?<br> A)NO5<br> B)N5O2<br> C)N2O5<br> D)N2O7

Juliette [100K]

Answer:

nick gur

Explanation:

5 0

2 years ago

Read 2 more answers