Question 1

What is the mass of one atom of the element hydrogen?

Accepted Answer

The mass of one atom of hydrogen is approximately 1.7 × 10-24 g, which is the mass of one atomic mass unit (amu). Choice A (2.0 g) and choice B (1.0 g) are far too large for the mass of one atom of hydrogen. Choice C (3.4 × 10-24 g) is close, but still not precise enough compared to the accepted value.

Question 2

How many electrons are in the ion,CO₃^2-?

Accepted Answer

The answer of How many electrons are in the ion,CO₃^2-? ...

Question 3

Which of the species below has 28 protons and 26 electrons?

Accepted Answer

The atomic number or number of protons in an element is unique to that element. 
The atomic number of iron (Fe) is 26, therefore it cannot have 28 protons. 
The atomic number of nickel (Ni) is 28, so it can have 28 protons. 
Furthermore, the species given in option B is the only one that contains nickel (Ni) as an element.

Question 4

How many moles and how many atoms of zinc are in a sample weighing 34.9 g?

Accepted Answer

The answer of How many moles and how many atoms...

Question 5

What is the identity of element Q if the ion Q²⁺ contains 10 electrons?

Accepted Answer

The answer of What is the identity of element Q...

Question 6

How many electrons are in the ion,Zn²⁺?

Accepted Answer

The neutral zinc atom has 30 electrons. When it loses 2 electrons to form Zn²⁺, it has 28 electrons.

Question 7

The element antimony has an atomic weight of 121.757 amu and only two naturally-occurring isotopes.One isotope has an abundance of 57.3% and an isotopic mass of 120.904 amu.Based on these data,what is the mass of the other isotope?

Accepted Answer

The answer of The element antimony has an atomic weight...

Question 8

Three atoms have the following properties.  The elements Y and Z are best described as

Accepted Answer

Y has 18 protons and Z has 20 protons, indicating that they are two different elements. The fact that they have different numbers of electrons (Y has 10 and Z has 18) suggests that they are not isotopes of the same element. They also do not have a net positive or negative charge, so they are not cations or anions.

Question 9

The smallest sample of carbon atoms that can be observed with the naked eye has a mass of approximately 2 × 10^-8 g.Given that 1 g = 6.02 × 10²³ amu,and that carbon has an atomic weight of 12.01 amu,determine the number of carbon atoms present in the sample.

Accepted Answer

First, convert the mass of the sample from grams to amu: 2 × 10^-8 g * (6.02 × 10^23 amu/g) = 1.204 × 10^16 amu. Then, divide by the atomic weight of carbon (12.01 amu) to find the number of atoms: 1.204 × 10^16 amu / 12.01 amu/atom ≈ 1 × 10^15 atoms.

Question 10

Three atoms have the following properties.  The elements X and Y are best described as

Accepted Answer

The answer of Three atoms have the following properties. ...

Question 11

Three atoms have the following properties.  Which of the following statements is true?

Accepted Answer

The answer of Three atoms have the following properties. ...

Question 12

Butyric acid has the structural formula given below.  What is the molecular or chemical formula for butyric acid?

Accepted Answer

The molecular formula for butyric acid is C4H8O2, which corresponds to choice C. The other choices do not have the correct number or types of atoms to match the molecular formula of butyric acid.

Question 13

How many electrons are in the ion,P^3-?

Accepted Answer

The answer of How many electrons are in the ion,P^3-? ...

Question 14

What is the identity of the element with 6 protons,7 neutrons,and 6 electrons?

Accepted Answer

The element with 6 protons is carbon (C). The number of neutrons and electrons does not change the identity of the element, only its isotope and charge state, respectively.

Question 15

An element has two naturally occurring isotopes.One has an abundance of 37.4% and an isotopic mass of 184.953 amu,and the other has an abundance of 62.6% and a mass of 186.956 amu.What is the atomic weight of the element?

Accepted Answer

The answer of An element has two naturally occurring isotopes.One...

Question 16

What type of bonding is found in the compound PCl₅?

Accepted Answer

PCl₅ contains nonmetals (P, Cl, and B) which typically form covalent bonds where electrons are shared between atoms. Additionally, there are no ions present which rules out ionic bonding, and hydrogen bonding typically occurs between hydrogen and highly electronegative elements such as oxygen, nitrogen, or fluorine which are not present in this compound. Lastly, there are no metals involved which rules out metallic bonding. Therefore, the best choice is covalent bonding (A).

Question 17

How many protons (p),neutrons (n),and electrons (e)are in one atom of  Mg?

Accepted Answer

The answer of How many protons (p),neutrons (n),and electrons (e)are...

Question 18

The atoms of a particular element all have the same number of protons as neutrons.Which of the following must be true?

Accepted Answer

The mass number is the sum of protons and neutrons in an atom's nucleus. If an element's atoms have the same number of protons and neutrons, then the mass number (protons + neutrons) would indeed be twice the atomic number (number of protons). Choices A and B are not necessarily true because the atomic weight of an element can be a decimal due to the presence of isotopes, and the atomic weight is an average that may not match the mass number of any specific atom.

Question 19

Steel is galvanized by giving it a surface coating of zinc.Galvanized steel is an example of

Accepted Answer

Galvanized steel is considered a mixture because it consists of steel (an alloy of iron and other elements) coated with zinc. The zinc and steel remain distinct substances that are combined physically rather than chemically, which is characteristic of mixtures.

Question 20

Identify the chemical symbol of element Q in  Q.

Accepted Answer

The chemical symbol of element Q is indicated by the second letter in the code, which is "e". If we look at the periodic table, the only element with the symbol that starts with "e" is selenium (Se). Therefore, the correct answer is D.

Quiz 2: Atoms, molecules, and Ions

What is the mass of one atom of the element hydrogen?

How many electrons are in the ion,CO₃^2-?

Which of the species below has 28 protons and 26 electrons?

How many moles and how many atoms of zinc are in a sample weighing 34.9 g?

What is the identity of element Q if the ion Q²⁺ contains 10 electrons?

How many electrons are in the ion,Zn²⁺?

The element antimony has an atomic weight of 121.757 amu and only two naturally-occurring isotopes.One isotope has an abundance of 57.3% and an isotopic mass of 120.904 amu.Based on these data,what is the mass of the other isotope?

Three atoms have the following properties. The elements Y and Z are best described as

The smallest sample of carbon atoms that can be observed with the naked eye has a mass of approximately 2 × 10^-8 g.Given that 1 g = 6.02 × 10²³ amu,and that carbon has an atomic weight of 12.01 amu,determine the number of carbon atoms present in the sample.

Three atoms have the following properties. The elements X and Y are best described as

Three atoms have the following properties. Which of the following statements is true?

Butyric acid has the structural formula given below. What is the molecular or chemical formula for butyric acid?

How many electrons are in the ion,P^3-?

What is the identity of the element with 6 protons,7 neutrons,and 6 electrons?

An element has two naturally occurring isotopes.One has an abundance of 37.4% and an isotopic mass of 184.953 amu,and the other has an abundance of 62.6% and a mass of 186.956 amu.What is the atomic weight of the element?

What type of bonding is found in the compound PCl₅?

How many protons (p) ,neutrons (n) ,and electrons (e) are in one atom of Mg?

The atoms of a particular element all have the same number of protons as neutrons.Which of the following must be true?

Steel is galvanized by giving it a surface coating of zinc.Galvanized steel is an example of

Identify the chemical symbol of element Q in Q.

Quiz 2: Atoms, molecules, and Ions

What is the mass of one atom of the element hydrogen?

How many electrons are in the ion,CO32-?

Which of the species below has 28 protons and 26 electrons?

How many moles and how many atoms of zinc are in a sample weighing 34.9 g?

What is the identity of element Q if the ion Q2+ contains 10 electrons?

How many electrons are in the ion,Zn2+?

The element antimony has an atomic weight of 121.757 amu and only two naturally-occurring isotopes.One isotope has an abundance of 57.3% and an isotopic mass of 120.904 amu.Based on these data,what is the mass of the other isotope?

Three atoms have the following properties. The elements Y and Z are best described as

The smallest sample of carbon atoms that can be observed with the naked eye has a mass of approximately 2 × 10-8 g.Given that 1 g = 6.02 × 1023 amu,and that carbon has an atomic weight of 12.01 amu,determine the number of carbon atoms present in the sample.

Three atoms have the following properties. The elements X and Y are best described as

Three atoms have the following properties. Which of the following statements is true?

Butyric acid has the structural formula given below. What is the molecular or chemical formula for butyric acid?

How many electrons are in the ion,P3-?

What is the identity of the element with 6 protons,7 neutrons,and 6 electrons?

An element has two naturally occurring isotopes.One has an abundance of 37.4% and an isotopic mass of 184.953 amu,and the other has an abundance of 62.6% and a mass of 186.956 amu.What is the atomic weight of the element?

What type of bonding is found in the compound PCl5?

How many protons (p) ,neutrons (n) ,and electrons (e) are in one atom of Mg?

The atoms of a particular element all have the same number of protons as neutrons.Which of the following must be true?

Steel is galvanized by giving it a surface coating of zinc.Galvanized steel is an example of

Identify the chemical symbol of element Q in Q.

How many electrons are in the ion,CO₃^2-?

What is the identity of element Q if the ion Q²⁺ contains 10 electrons?

How many electrons are in the ion,Zn²⁺?

The smallest sample of carbon atoms that can be observed with the naked eye has a mass of approximately 2 × 10^-8 g.Given that 1 g = 6.02 × 10²³ amu,and that carbon has an atomic weight of 12.01 amu,determine the number of carbon atoms present in the sample.

How many electrons are in the ion,P^3-?

What type of bonding is found in the compound PCl₅?