CHEMISTRY HIGH SCHOOL

A 0.100 M solution of K2SO4 would contain the same total ion concentration as which of the following solutions?0.0800 M Na2CO3 0.100 M NaCl 0.0750 M Na3PO4 0.0500 M NaOH

Answers

Answer 1

Answer:

Answer:

The third chice: 0.0750 M Na₂SO₄

Explanation:

Assume 100% ionization:

1) 0.100 M solution K₂SO₄

K₂SO4 (aq) → 2K⁺ (aq) + SO₄²⁻ (aq)

Mole ratios: 1 mol K₂SO4 : 2 mol K⁺ + 1 mol SO₄²⁻ (aq) : 3 mol ions. This is 1 : 3

At constant volume, the mole ratios are equal to the concentration ratios (M).

1 M K₂SO₄: 3 M ions = 0.100 M K₂SO₄ / x ⇒ x = 0.300 M ions

This means, that you have to find which of the choices is a solution that contains the same 0.300 M ion concentration.

2) 0.0800 M Na₂CO₃

Na₂CO₃ (aq) → 2 Na⁺ + CO₃⁻

1 M Na₂CO₃ / 3 M ions = 0.0800M / x ⇒ x = 0.0267 M ions

This is not equal to 0.300 M, so this solution would not contain the same total concentration as a 0.100 M solution of K₂SO₄, and is not the right answer.

3) 0.100 M NaCl

NaCl → Na⁺ + Cl⁻

1 M NaCl / 2 M ions = 0.100 M NaCl / x ⇒ x = 0.200 M ions

This is not equal to 0.300 M ion, so not a correct option.

4) 0.0750 M Na₃PO₄

Na₃PO₄ → 3Na⁺ + PO₄³⁻

1 M Na₃PO₄ / 4 M ions = 0.0750 M Na₃PO₄ / x ⇒ x = 0.300 M ions

Hence, this ion concentration is equal to the ion concentration of a 0.100 M solution of K₂SO₄, and is the correct choice.

5) 0.0500 M NaOH

NaOH → Na⁺ + OH⁻

1 M NaOH / 2 mol ions = 0.0500 M NaOH / x ⇒ x = 0.100 M ions

Not equal to 0.300 M, so wrong choice.

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Give the number of valence electrons for each of the following: Ba, Al, P, Se, Br, K

Answers

Ba: 2
Al: 3
P: 5
Se: 6
Br: 7
K: 1

Hope this helps!

What is a chemical substance that cannot be broken down into another chemical substance?A. Element

B. Molecule

C. Matter

D. Compound

Answers

Molecule is a chemical substance that cannot be broken down into another chemical substance.

Answer:

The correct answer is A. An element.

Explanation:

An element is a chemical substance that cannot be broken down into another chemical substance.

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A.
+2

B.
-1

C.
+1

D.
-2

Answers

D. 2- youre adding two negative charges to a neutral element

The electrical charge of the oxygen ion is -2.

What is the IUPAC name for the compound ZnO?(1) zinc oxide (2) zinc oxalate(3) zinc peroxide (4) zinc hydroxide

Answers

The correct answer is option 1. THe IUPAC name for the compound ZnO is zinc oxide. It is an inorganic compound that is a white powder, insoluble in water and widely used as an additive in many materials and products. Most common application is as a skin cream.

Write an equation that shows the formation of a selenide ion from a neutral selenium atom

Answers

Answer:

Se + 2e- => Se-2

Explanation:

Ions are electrically charged particles, formed due to the gain or loss of electrons by an atom.

There are two types of ions cations and anions. An element that loses their electrons and forms positive ions are cations while metals and element that gains one or more electrons and forms negative ions are anions.

Selenium is an atom with atomic number 34 and represented as Se. The electronic configuration of Se is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. Selenium will gain 2 more electrons to complete it p orbital and form an ion Se-2.

The equation is as below:

Se + 2e- => Se-2

PLEASE HELP CHEM BABES I HAVE BEEN CRYING FOR A WHILE NOW 1. Calculate the mass of nitrogen dioxide (NO2) present in a 0.831 L container if the pressure is 100 kPa at a temperature of 27 oC. R = 8.31 kPa x L / mol x K. (K = oC + 273).

2. A 33.2 L tank contains 280 g of compressed helium. If the pressure inside the tank is 700.0 kPa, what is the temperature of the compressed gas? You must convert the mass of helium into moles using the molar mass of He. The conversion factor will be 1 mol / molar mass of helium. R = 8.31 kPa x L / mol x K

Answers

Answer: See below

Explanation:

1. To calculate the mass, you know you can convert by using molar mass. Since mass is in grams, we can use molar mass to convert moles to grams. This calls for the Ideal Gas Law.

Ideal Gas Law: PV=nRT

We manipulate the equation so that we are solving for moles, then convert moles to grams.

n=PV/RT

P= 100 kPa

V= 0.831 L

R= 8.31 kPa*L/mol*K

T= 27°C+273= 300 K

Now that we have our values listed, we can plug in to find moles.

$n=((100kPa)(0.831L))/((8.31kPa*l/molK)(300K))$