2023 Semester 1 Chem Final

Instrukcije

You may use your notes/work papers to complete the final. NO PHONES OR INTERNET.

Obavezno

2

A user is constructing an ionic bond between beryllium and chlorine and has reached the stage below. What should the user do next? [Take time to study the picture before you answer]

Transfer an electron from the chlorine atom to the beryllium atom.

Transfer an electron from the beryllium atom to the chlorine atom.

Add another beryllium atom.

Add another chlorine atom.

Obavezno

2

Lithium nitride has the chemical formula Li₃N. Rubidium is in the same chemical family as lithium. What is the formula of rubidium nitride?

Rb₃N

RbN

Rb₂N₃

RbN₃

Obavezno

2

How many protons and neutrons does iron-56 have?

26 protons and 30 neutrons

30 protons and 56 neutrons

26 protons and 56 neutrons

26 protons and 26 neutrons

Obavezno

2

Only atom B is an isotope.

A and B are isotopes of different elements.

The two atoms have the same mass.

A and B are isotopes of the same element.

Obavezno

2

The diagram of an atom above shows two regions, the nucleus (1) and the area surrounding the nucleus (2). How are the protons, neutrons, and electrons that make up an atom distributed?

Electrons and neutrons in region 1, protons orbiting in region 2

Protons in region 1, neutrons and electrons orbiting in region 2

Protons and electrons in region 1, neutrons orbiting in region 2

Protons and neutrons in region 1, electrons orbiting in region 2

Obavezno

2

The diagram shows a simplified version of the periodic table along with two arrows indicating down and across (left to right).
What trend is there in ionization energy from element to element moving down and across the periodic table as indicated by the arrows?

Down = increases, Across = increases

Down = decreases, Across = increases

Down = decreases, Across = decreases

Down = increases, Across = decreases

Obavezno

2

Obavezno

2

The diagram above represents the formation of lithium oxide from its elements. Which of the following statements provides the best explanation of the chemical reaction?

Two atoms of lithium each donate one electron to oxygen, forming two positively charged lithium ions and one negatively charged oxygen ion that are attracted to one another, forming a covalent bond.

Two atoms of lithium and one atom of oxygen share electrons, forming an ionic bond.

Two atoms of lithium each donate one electron to oxygen, forming two positively charged lithium ions and one negatively charged oxygen ion that are attracted to one another, forming an ionic bond.

Two atoms of lithium and one atom of oxygen share electrons, forming a covalent bond.

Obavezno

2

Which element is most likely to chemically combine with calcium (Ca) in a 1:1 ratio?

Bromine

Magnesium

Sulfur

Nitrogen

Obavezno

6

Obavezno

2

A portion of the periodic table is shown below. Which column of elements would be most likely to chemically combine with sodium in a 1:1 ratio?

None of these groups would combine with sodium in a 1:1 ratio

Nitrogen, Phosphorus, Arsenic group

Fluorine, Chlorine, Bromine group

Oxygen, Sulfur, Selenium group

Obavezno

2

Select the best statement to describe the phenomenon of light emission from an excited hydrogen atom. (There may be more than one correct statement, but choose the "fullest" correct statement)

As the electrons absorb energy, they release light.

When electrons absorb energy, they release light of varying wavelengths, depending upon which energy shell they are going to.

When the electrons return to ground state, they release light of varying wavelengths, depending upon which energy shell they are returning from.

When electrons release light from an excited hydrogen atom, it can be of any wavelength, even more than the four shown in the model.

Obavezno

2

Based on the Lewis dot structures above, which two elements are expected to be located in the same group on the periodic table?

A and R

A and Z

R and X

X and Z

Obavezno

1

Obavezno

2

Obavezno

2

What type of bond will these elements form?

Ionic

Metallic

Covalent

Obavezno

2

What type of bond will these elements form?

Metallic

Covalent

Ionic

Obavezno

2

Of the elements shown in the portion of the periodic table, which element is the most electronegative (has the highest electronegativity)?

F - Fluorine

N - Nitrogen

As - Arsenic

Br - Bromine

Obavezno

2

The image shows Force of Attraction values for four scenarios. Select the best description of the trend shown.

The force of attraction increases as the number of protons decreases

The force of attraction decreases as the number of protons increases

The force of attraction increases as the number of protons increases.

The force of attraction increases as the distance increases

Obavezno

2

Which statement best describes the relationship between distance and force of attraction.

As the distance between the oppositely charged particles increases, the force of attraction increases.

As the distance between the oppositely charged particles increases, the force of attraction decreases.

As the number of positive particles increases, the force of attraction decreases.

The shorter the distance between oppositely charged particles, the weaker the force of attraction is.

Obavezno

1

Choose the correct name for this molecule: CCl₄

carbon tetrachloride

tetracarbon chloride

monochlorocarbon

carbon chloride

Obavezno

1

Which of the following would be the best formula for lead (IV) oxide?

Pb₂O

Pb₂O₄

PbO₂

PbO

Obavezno

2

Which is the correct formula for "dinitrogen tetroxide"?

N₂O₄

N₄O₂

₂N₄O

NO₄

Obavezno

1

How many valence electrons are in the atom shown in the image above?

4

8

0

2

Obavezno

2

What does the number of dots in a Lewis Dot structure indicate about the atom?

number of electrons

number of valence electrons

number of neutrons

number of protons

2023 Semester 1 Chem Final

A user is constructing an ionic bond between beryllium and chlorine and has reached the stage below. What should the user do next? [Take time to study the picture before you answer]

Lithium nitride has the chemical formula Li3N. Rubidium is in the same chemical family as lithium. What is the formula of rubidium nitride?

How many protons and neutrons does iron-56 have?

The diagram of an atom above shows two regions, the nucleus (1) and the area surrounding the nucleus (2). How are the protons, neutrons, and electrons that make up an atom distributed?

The diagram shows a simplified version of the periodic table along with two arrows indicating down and across (left to right).What trend is there in ionization energy from element to element moving down and across the periodic table as indicated by the arrows?

The diagram above represents the formation of lithium oxide from its elements. Which of the following statements provides the best explanation of the chemical reaction?

Which element is most likely to chemically combine with calcium (Ca) in a 1:1 ratio?

A portion of the periodic table is shown below. Which column of elements would be most likely to chemically combine with sodium in a 1:1 ratio?

Select the best statement to describe the phenomenon of light emission from an excited hydrogen atom. (There may be more than one correct statement, but choose the "fullest" correct statement)

Based on the Lewis dot structures above, which two elements are expected to be located in the same group on the periodic table?

What type of bond will these elements form?

What type of bond will these elements form?

Of the elements shown in the portion of the periodic table, which element is the most electronegative (has the highest electronegativity)?

The image shows Force of Attraction values for four scenarios. Select the best description of the trend shown.

Which statement best describes the relationship between distance and force of attraction.

Choose the correct name for this molecule: CCl4

Which of the following would be the best formula for lead (IV) oxide?

Which is the correct formula for "dinitrogen tetroxide"?

How many valence electrons are in the atom shown in the image above?

What does the number of dots in a Lewis Dot structure indicate about the atom?

A user is constructing an ionic bond between beryllium and chlorine and has reached the stage below. What should the user do next? [Take time to study the picture before you answer]

Lithium nitride has the chemical formula Li3N. Rubidium is in the same chemical family as lithium. What is the formula of rubidium nitride?

How many protons and neutrons does iron-56 have?

The diagram of an atom above shows two regions, the nucleus (1) and the area surrounding the nucleus (2). How are the protons, neutrons, and electrons that make up an atom distributed?

The diagram shows a simplified version of the periodic table along with two arrows indicating down and across (left to right).What trend is there in ionization energy from element to element moving down and across the periodic table as indicated by the arrows?

The diagram above represents the formation of lithium oxide from its elements. Which of the following statements provides the best explanation of the chemical reaction?

Which element is most likely to chemically combine with calcium (Ca) in a 1:1 ratio?

A portion of the periodic table is shown below. Which column of elements would be most likely to chemically combine with sodium in a 1:1 ratio?

Select the best statement to describe the phenomenon of light emission from an excited hydrogen atom. (There may be more than one correct statement, but choose the "fullest" correct statement)

Based on the Lewis dot structures above, which two elements are expected to be located in the same group on the periodic table?

What type of bond will these elements form?

What type of bond will these elements form?

Of the elements shown in the portion of the periodic table, which element is the most electronegative (has the highest electronegativity)?

The image shows Force of Attraction values for four scenarios. Select the best description of the trend shown.

Which statement best describes the relationship between distance and force of attraction.

Choose the correct name for this molecule: CCl4

Which of the following would be the best formula for lead (IV) oxide?

Which is the correct formula for "dinitrogen tetroxide"?

How many valence electrons are in the atom shown in the image above?

What does the number of dots in a Lewis Dot structure indicate about the atom?

Lithium nitride has the chemical formula Li₃N. Rubidium is in the same chemical family as lithium. What is the formula of rubidium nitride?

The diagram shows a simplified version of the periodic table along with two arrows indicating down and across (left to right).
What trend is there in ionization energy from element to element moving down and across the periodic table as indicated by the arrows?

Choose the correct name for this molecule: CCl₄

Lithium nitride has the chemical formula Li₃N. Rubidium is in the same chemical family as lithium. What is the formula of rubidium nitride?

The diagram shows a simplified version of the periodic table along with two arrows indicating down and across (left to right).
What trend is there in ionization energy from element to element moving down and across the periodic table as indicated by the arrows?

Choose the correct name for this molecule: CCl₄