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2 years ago

What gives an atom mass?

Chemistry

1 answer:

klemol [59]2 years ago

6 0

B. Proton and neutrons in nucleus. Electron is not located at nucleus.

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Help me what the landform

mariarad [96]

A.) Delta . Delta is a landform that forms from Deposition.

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3 years ago

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What is the pH of a 0.300 M NH₃ solution that has Kb = 1.8 × 10⁻⁵ ? The equation for the dissociation of NH₃ is: NH₃ (aq) + H₂O

nalin [4]

Answer:

11.4

Explanation:

Step 1: Given data

Concentration of the base (Cb): 0.300 M

Basic dissociation constant (Kb): 1.8 × 10⁻⁵

Step 2: Write the dissociation equation

NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)

Step 3: Calculate the concentration of OH⁻

We will use the following expression.

$[OH^{-} ]=\sqrt{Kb \times Cb } = \sqrt{1.8 \times 10^{-5} \times 0.300 } = 2.3 \times 10^{-3} M$

Step 4: Calculate the pOH

We will use the following expression.

$pOH =-log[OH^{-} ]= -log(2.3 \times 10^{-3} M) = 2.6$

Step 5: Calculate the pH

We will use the following expression.

$pH+pOH=14\\pH = 14-pOH = 14-2.6 = 11.4$

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3 years ago

9. Elements that are characterized by the filling of p orbitals are classified as

Bogdan [553]

Answer:

p block elements

Explanation:

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3 years ago

PO3−4 what's the formula name?

masha68 [24]

Answer:

Phosphate ion

Explanation:

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3 years ago

What is force? Why?

larisa [96]

In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.

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3 years ago