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Charra [1.4K]
2 years ago
8

I don't know if this is a chemistry question but I need help its a science question from what I know!

Chemistry
1 answer:
Alex17521 [72]2 years ago
6 0

Answer:

The 3 rd answer

Explanation:

Atomic number is the number of protons in the nucleus of that element...

Mass number is the the sum of protons and neutrons in the nucleus of the atom..

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I NEED HELP PLEASE, THANKS! :)
marin [14]

Answer:

\large \boxed{1.447 \times 10^{23}\text{ molecules Cu(OH)}_{2 }}

Explanation:

1. Calculate the moles of copper(II) hydroxide

\text{Moles of Cu(OH)}_{2} = \text{23.45 g Cu(OH)}_{2} \times \dfrac{\text{1 mol Cu(OH)}_{2}}{\text{97.562 g Cu(OH)}_{2}} = \\\\\text{0.240 36 mol Cu(OH)}_{2}

2. Calculate the molecules of copper(II) hydroxide

\text{No. of molecules} = \text{0.240 36 mol Cu(OH)}_{2} \times \dfrac{6.022 \times 10^{23}\text{ molecules Cu(OH)}_{2}}{\text{1 mol Cu(OH)}_{2}}\\\\= 1.447 \times 10^{23}\text{ molecules Cu(OH)}_{2}\\\text{The sample contains $\large \boxed{\mathbf{1.447 \times 10^{23}}\textbf{ molecules Cu(OH)}_{\mathbf{2}}}$}

6 0
3 years ago
Two charged particles repel each other with a force of F.
mihalych1998 [28]

Answer:

it would increase to twice what it was

3 0
3 years ago
The K w for water at 0 ∘ C is 0.12 × 10 − 14 . Calculate the pH of a neutral aqueous solution at 0 ∘ C.
dusya [7]

Answer:

pH = 7.46

Explanation:

2H₂O  ⇄  H₃O⁺  .  OH⁻          Kw = [H₃O⁺] . [OH⁻]

[H₃O⁺] = [OH⁻]

√0.12×10⁻¹⁴ = [H₃O⁺] → 3.46×10⁻⁸  M

- log  [H₃O⁺] = pH

- log 3.46×10⁻⁸ = pH → 7.46

6 0
3 years ago
What does the subscript tell you?
OverLord2011 [107]
B. The number of atoms of each element in a formula
8 0
2 years ago
Every spring has an equilibrium position. Which statements describe a spring at its equilibrium position? Check all that apply.
rjkz [21]

The statements describe a spring at its equilibrium position is the elastic potential energy is zero, the displacement of the spring is at a maximum and the net force acting on the spring is zero.

<h3>What is the equilibrium position?</h3>

A body is in equilibrium when the sum of all forces acting on it equals zero. According to Newton's First Law, when resulting from the laws that act on a body that remains in a state of restriction or in motion in its motion, it remains uniformly null.

In this case the only statements that match the definition of equilibrium position are:

  • The elastic potential energy is zero.
  • The displacement of the spring is at a maximum.
  • The net force acting on the spring is zero.

See more about equilibrium position at brainly.com/question/10374921

#SPJ1

8 0
2 years ago
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