Question 1

Write the formula of lead(II)chloride.

Accepted Answer

The answer of Write the formula of lead(II)chloride....

Question 2

Almost all the mass of an atom is concentrated in the nucleus.

Accepted Answer

The nucleus contains protons and neutrons, which are much heavier than electrons and account for almost all of the mass of the atom.

Question 3

Write the formula for the acid formed from the nitrite anion, and then name the acid.

Accepted Answer

The answer of Write the formula for the acid formed...

Question 4

The number of neutrons in all atoms of an element is the same.

Accepted Answer

The number of neutrons in an atom of an element can vary, as it depends on the atomic mass of the specific isotope of the element. Isotopes have the same number of protons (which defines the element), but different numbers of neutrons, resulting in differences in atomic mass.

Question 5

The elements known as the halogens are useful as disinfectants.Name two halogens.

Accepted Answer

The answer of The elements known as the halogens are...

Question 6

Marie Curie suggested the name "radioactivity" to describe the spontaneous emission of particles and/or radiation.

Accepted Answer

Marie Curie is credited with coining the term "radioactivity" to describe the phenomenon she and her husband Pierre were studying.

Question 7

Write the formula of calcium carbonate.

Accepted Answer

The answer of Write the formula of calcium carbonate....

Question 8

Write the formula of ammonium chlorate.

Accepted Answer

The answer of Write the formula of ammonium chlorate....

Question 9

When a beam of alpha particles passes between two electrically charged plates, the beam is deflected toward the positive plate.

Accepted Answer

The answer of When a beam of alpha particles passes...

Question 10

Using a cathode ray tube, J.J.Thomson determined the magnitude of the electric charge on the electron.

Accepted Answer

J. J. Thomson determined the charge-to-mass ratio of the electron using a cathode ray tube, not the magnitude of the electric charge. The magnitude of the electric charge on the electron was later determined by Robert A. Millikan through the oil-drop experiment.

Question 11

Write the formula for the acid formed from the hydrogen sulfate anion, and then name the acid.

Accepted Answer

The answer of Write the formula for the acid formed...

Question 12

Name the following compound: KCl.

Accepted Answer

The answer of Name the following compound: KCl....

Question 13

Define allotrope.

Accepted Answer

The answer of Define allotrope....

Question 14

Name the following compound: Mg(NO₃)₂.

Accepted Answer

The answer of Name the following compound: Mg(NO₃)₂....

Question 15

The formula for isopropyl alcohol is sometimes written as (CH₃)₂CHOH to better indicate how the atoms are connected.How many hydrogen atoms would be contained in 3 dozen isopropyl alcohol molecules?

Accepted Answer

The answer of The formula for isopropyl alcohol is sometimes...

Question 16

Name the following compound: NaNO₂.

Accepted Answer

The answer of Name the following compound: NaNO₂....

Question 17

The atomic number is equal to the number of protons in the nucleus of each atom of an element.

Accepted Answer

This is a basic principle in chemistry. The atomic number is the unique identifier for each element and it is determined by the number of protons in the nucleus of an atom.

Question 18

What are isotopes?

Accepted Answer

The answer of What are isotopes?...

Question 19

Write the formula for the acid formed from the permanganate anion, and then name the acid.

Accepted Answer

The answer of Write the formula for the acid formed...

Question 20

The proton is about 1840 times heavier than the electron.

Accepted Answer

The mass of a proton is approximately 1.0073 atomic mass units (amu), while the mass of an electron is approximately 0.00055 amu. Therefore, the proton is approximately 1840 times heavier than the electron.

Quiz 2: Atoms, Molecules, and Ions

Write the formula of lead(II)chloride.

Almost all the mass of an atom is concentrated in the nucleus.

Write the formula for the acid formed from the nitrite anion, and then name the acid.

The number of neutrons in all atoms of an element is the same.

The elements known as the halogens are useful as disinfectants.Name two halogens.

Marie Curie suggested the name "radioactivity" to describe the spontaneous emission of particles and/or radiation.

Write the formula of calcium carbonate.

Write the formula of ammonium chlorate.

When a beam of alpha particles passes between two electrically charged plates, the beam is deflected toward the positive plate.

Using a cathode ray tube, J.J.Thomson determined the magnitude of the electric charge on the electron.

Write the formula for the acid formed from the hydrogen sulfate anion, and then name the acid.

Name the following compound: KCl.

Define allotrope.

Name the following compound: Mg(NO3)2.

The formula for isopropyl alcohol is sometimes written as (CH3)2CHOH to better indicate how the atoms are connected.How many hydrogen atoms would be contained in 3 dozen isopropyl alcohol molecules?

Name the following compound: NaNO2.

The atomic number is equal to the number of protons in the nucleus of each atom of an element.

What are isotopes?

Write the formula for the acid formed from the permanganate anion, and then name the acid.

The proton is about 1840 times heavier than the electron.

Name the following compound: Mg(NO₃)₂.

The formula for isopropyl alcohol is sometimes written as (CH₃)₂CHOH to better indicate how the atoms are connected.How many hydrogen atoms would be contained in 3 dozen isopropyl alcohol molecules?

Name the following compound: NaNO₂.