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3 years ago

An ion has a charge of 2- and 18 electrons.

Chemistry

1 answer:

dmitriy555 [2]3 years ago

6 0

Answer:

The answer to your question is:

Explanation:

Data

Ion charge of 2- and 18 electrons

Process

a) From which atom does this ion form?

If an Ion has a negative charge, it means that it has more electrons than the neutral atom. So, it the ion has 18 electrons, it means the neutral atom has 16 electrons.

In the periodic table we find that the atom with 16 electrons is Sulfur.

B) How do you know?

I have explained it.

An ion with a negative charge means that it gained the number of negative charges compare with the neutral atom.

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5 0

2 years ago

A mixture of CrBr3 and inert material is analyzed to determine the Cr content. First the mixture is dissolved in water. Then all

Masteriza [31]

Answer:

Mass% Cr = 85.5%

Explanation:

Given:

Mass of CrBr3 sample = 0.8409 g

Mass of the AgBr precipitate = 1.0638 g

To determine:

The mass percent of Cr in the sample

Calculation:

The reaction of CrBr3 with silver nitrate results in the precipitation of the bromide ion as silver chloride (AgBr) and Cr as soluble Cr(NO3)2

CrBr3(aq) + 3AgNO3(aq)→ 3AgBr(s) + Cr(NO3)3(aq)

Molecular weight of AgBr =187.77 g/mol

Moles of AgBr precipitated is:

$Moles(AgBr)=\frac{Mass(AgBr)}{Mol.wt(AgBr)}=\frac{0.8409g}{187.77g/mol}=0.004478moles$

Since 1 mole of AgBr contains 1 mole of Cl, therefore:

# moles of Cl = 0.004478 moles

At wt of Cl = 35.45 g/mol

$Mass(Chloride)=moles*at.wt = .004478moles*34.45g/mol=0.1543$

$Mass%(chloride)=\frac{mass(chloride)}{mass(sample)}*100=\frac{0.1543}{1.0638}*100 = 14.50%$

Mass%(Cr) = 100 - 14.50=85.5%

5 0

3 years ago

PLEASE HELP ASAP

bulgar [2K]

Answer: b should be the answer just took this test

Explanation:

3 0

2 years ago

What is the conjugate acid of clo3 −? 1. hclo3 2. clo3 − does not contain oh−, so it is not a base and thus cannot have a conjug

Dahasolnce [82]

Answer is: 1. HClO₃; (chloric acid).
Balance chemical reaction (dissociation):
ClO₃⁻(aq) + H₂O(l) ⇄ HClO₃(aq) + OH⁻(aq).
According to Bronsted-Lowry theory acid are donor of protons and bases are acceptors of protons (the hydrogen cation or H⁺).
The chlorate anion (ClO₃⁻) is Bronsted base and it can accept proton and become conjugate acid HClO₃..

3 0

3 years ago

A balloon has a pressure of 3.1 atm at a volume of 155 ml. if the temperature is held constant, what is the volume (ml) if the p

GarryVolchara [31]

Answer:

45.8 mL

Explanation:

If all variables are held constant, the new volume can be found using the Boyle's Law equation. The equation looks like this:

P₁V₁ = P₂V₂

In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the new volume by plugging the given values into the equation and simplifying.

P₁ = 3.1 atm P₂ = 10.5 atm

V₁ = 155 mL V₂ = ? mL

P₁V₁ = P₂V₂ <----- Boyle's Law equation

(3.1 atm)(155 mL) = (10.5 atm)V₂ <----- Insert values

480.5 = (10.5 atm)V₂ <----- Multiply 3.1 and 155

45.8 = V₂ <----- Divide both sides by 10.5

4 0

2 years ago