Which is the smallest unit of ionic compound.a) Atom
b) ion
c) Free radical
d) None

Answers

Answer 1

Answer:

Answer:

Explanation:

None of the following options are ionic compounds

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What is the definition of half-life

Answers

Answer:

the time taken for the radioactivity of a specified isotope to fall to half its original value.

Explanation:

Select all that apply. Consider this system: CH3COOH(aq) H+(aq) + CH3COO- Ka = 1.8 x 10-5
What will happen to the equilibrium as OH- ions are added?

A) H+ will combine with OH- to form water.
B) [CH3COOH] will increase.
C) The acid will dissociate to supply more H+.
D) The reaction will move to the right.
E) The reaction will move to the left.

Answers

Consider this system: CH3COOH(aq) H+(aq) + CH3COO- Ka = 1.8 x 10-5
The equilibrium as OH- ions are added;

A) H+ will combine with OH- to form water.

C) The acid will dissociate to supply more H+.
D) The reaction will move to the right.

Answer : The correct options are, (A), (C) and (D)

Explanation :

Le-Chatelier's principle : It states that if any change in the variables of the reaction, then the equilibrium will shift in that direction where the effect will be minimum.

The balanced equilibrium reaction will be,

$CH_3COOH(aq)\rightleftharpoons H^+(aq)+CH_3COO^-$

As the concentration of $H^+$ are decreased, the equilibrium will shift in a direction where concentration of $H^+$ is increasing and thus the dissociation of acid will increase to supply more of $H^$ ions. During this process the reaction will move to the right direction.

In the given equilibrium reaction when the $OH^-$ are added then the $H^+$ ion will combine with $OH^-$ ion to form water.

Hence, the correct options are, (A), (C) and (D)

The most easily polluted groundwater reservoirs are ______ aquifers?

Answers

Water-table aquifers.

The most easily polluted groundwater reservoirs are water-table aquifers.

Infiltration is the process by which rainwater becomes groundwater. In the water cycle, which involves primarily; evaporation, condensation and precipitation. Henceforth, after precipitation comes infiltration in the land areas leaving the rainwater aggregated in a single location which accumulates over time. Then this process is followed by runoff and subsurface flow by which water flows through other bodies of water, either in river, sea or ocean, even lake. Other rainwaters that has segregated and wasn’t able to transport itself stays in the process of infiltration, thus groundwater.

Which of the following is true about limiting and excess reagents?

Links are reported

Answers

Answer:

the first one

Explanation:

I take this subject

As an atom becomes an ion, its mass number(1) decreases(2) increases(3) remains the same

Answers

As an atom becomes an ion, its mass number $\boxed{\left( 3 \right){\text{ remains the same}}}$

Further explanation:

The smallest unit of an element is called an atom. It is also known as the building block of matter. An atom is generally represented as $_{\text{Z}}^{\text{A}}{\text{X}}$ , where X is the symbol of the element, A is its atomic mass or mass number and Z is its atomic number.

The number of protons present in the atomic nucleus is termed as the atomic number (Z) whereas the total number of nucleons present in the nucleus of an atom is called mass number or atomic mass (A).

When electrons are either gained or lost from the neutral atom, it results in the formation of ions. Cations are the positively charged ions that are formed due to the removal of electrons from the neutral atom. Anions are the negatively charged ions that result from the addition of electrons to the neutral atom.

Since the formation of either type of ion requires gain or loss of electrons but mass number is the total number of protons and neutrons present in the atomic nucleus, the mass number remains the same when ions are formed from their respective ions. Therefore option (3) is the correct answer.

Consider an example of a sodium atom whose atomic number is 11 so it has an electronic configuration of $1{s^2}2{s^2}2{p^6}3{s^1}$ . It loses one electron to form its monovalent ion, ${\text{N}}{{\text{a}}^ + }$ which has the configuration of $1{s^2}2{s^2}2{p^6}$ . The number of electrons in Na is 11 while that in ${\text{N}}{{\text{a}}^ + }$ is 10. But both the species have same number of protons and neutrons in them. So the mass number remains unchanged if an atom forms its ions.

Learn more:

1. Component of John Dalton’s atomic theory: brainly.com/question/2357175

2. Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: atom, matter, atomic nucleus, proton, electron, neutron, cations, anions, Na, 11, Na+, electronic configuration.

Becoming an ion involves gaining or losing electrons
Electrons have a relative mass of 0
So adding or removing them doesn't change the mass of the atom
So the answer is (3) remains the same

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