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3 years ago

A simple clear answer plz, Thanks.

Chemistry

1 answer:

Allushta [10]3 years ago

4 0

Answer:

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. Hope this helps!

Explanation:

um same as the answer...?

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Exactly 17.0 mL of a H2SO4 solution was required to neutralize 45.0 mL of 0.235 M NaOH. What was the concentration of the H2SO4

aleksandr82 [10.1K]

Answer:

Molarity for the sulfuric acid is 0.622 M

Explanation:

When we neutralize an acid with a base, molarity of both . both volume are the same. The formula is:

M acid . volume of acid = M base . volume of base

M acid = unknown

Volume of acid = 17 mL

Volume of base = 45 mL

M base = 0.235 M

Therefore, we replace: M acid . 17 mL = 0.235 M . 45 mL

M acid = (0.235 M . 45 mL) / 17 mL

M acid = 0.622 M

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3 years ago

At higher elevations, the boiling point of water decreases, due to the decrease in atmospheric pressure. As a result, what concl

White raven [17]

I believe the correct response is A. At higher elevations it would take less time to hard boil an egg, because there is less atmospheric pressure.

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3 years ago

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Aleksandr-060686 [28]

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3 years ago

An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of

nasty-shy [4]

Answer:

-3

General Formulas and Concepts:

Chemistry - Atomic Structure

Protons have a positive (+) charge
Neutrons have a neutral (0) charge
Electrons have a negative (-) charge

Explanation:

Step 1: Define

7 protons, 9 neutrons, 10 electrons.

+7, +0, -10

Step 2: FInd charge

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3 years ago

What is the mass percentage of iodine (I2) in a solution containing 4.0×10−2 mol I2 in 130 g of CCl4? Express your answer using

musickatia [10]

Answer:

A. 7.2%

B. 8.6 ppm

Explanation:

Part A

First let's calculate the mass of I₂, using the known value of moles and the molecular weight (253.8 g/mol)

4.0x10⁻² mol I₂ * 253.8 g/mol = 10.152 g I₂

Mass percentage is calculated using the mass of I₂ and the total mass (mass of I₂ + mass of CCl₄)

Total mass = 130 + 10.152 = 140.152 g

Mass percentage I₂ = 10.152 / 140.152 * 100 = 7.2%

Part B

The concentration of Sr⁺² in ppm is calculated using the formula

mg Sr⁺² / L water

We're given the mass of Sr⁺² in grams, so now we convert it into mg:

8.2x10⁻³g * $\frac{1000mg}{1g}$ = 8.2 mg

Now to convert kg of water into L, we use the density of seawater (1050 kg/m³):

Converting density: 1050 $\frac{kg}{m^{3}}$ * $\frac{1m^{3}}{1000L}$ = 1.05 kg/L

Volume of one kilogram of water = 1kgWater ÷ 1.05 kg/L = 0.95 L

Finally we calculate the concentration of Sr⁺²:

8.2 mg / 0.95 L = 8.6 ppm

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3 years ago