2 years ago

What is the neutral subatomic particle that is a part of the nucleus?

Chemistry

1 answer:

lisabon 2012 [21]2 years ago

8 0

Answer

A neutron

Explanation:

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The number of protons and neutrons combined in an atom of a particular element

Kobotan [32]

The number of protons and neutrons combined in an atom is called the mass number.

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2 years ago

What is the viscosity and flammability of refinery gas?

Liono4ka [1.6K]

Hydrocarbons

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2 years ago

Which of there is an indication that a chemical reaction has occurred?

Komok [63]

Answer is (b) , because a chemical change happened

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2 years ago

A monoprotic weak acid when dissolved in water is 0.66% dissociated and produces a solution with a pH of 3.04. Calculate the Ka

raketka [301]

Answer:

Ka = 6.02x10⁻⁶

Explanation:

The equilibrium that takes place is:

HA ⇄ H⁺ + A⁻

Ka = [H⁺][A⁻]/[HA]

We calculate [H⁺] from the pH:

pH = -log[H⁺]

[H⁺] = $10^{-pH}$

[H⁺] = 9.12x10⁻⁴ M

Keep in mind that [H⁺]=[A⁻].

As for [HA], we know the acid is 0.66% dissociated, in other words:

[HA] * 0.66/100 = [H⁺]

We calculate [HA]:

[HA] = 0.138 M

Finally we calculate the Ka:

Ka = $\frac{[9.12x10^{-4}]*[9.12x10^{-4}]}{[0.138]}$ = 6.02x10⁻⁶

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2 years ago

Identify the main purpose of the Periodic Table. *

saw5 [17]

The periodic table is one of the most important tools in the history of chemistry. It describes the atomic properties of every known chemical element in a concise format, including the atomic number, atomic mass and relationships between the elements. Elements with similar chemical properties are arranged in columns in the periodic table.

The table thus is a quick reference as to what elements may behave the same chemically or which may have similar weights or atomic structures.

Hope this answer helps you

4 0

2 years ago