V 2.0 2023 Semester 1 Chem Final (12/20/2023)

Akwankyerɛ

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

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2

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

Add another magnesium atom.

Transfer an electron from the magnesium atom to the fluorine atom.

Transfer an electron from the fluorine atom to the magnesium atom.

Add another fluorine atom.

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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

RbN₃

Rb₂N₃

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2

How many protons and neutrons does iron-56 have?

26 protons and 30 neutrons

26 protons and 26 neutrons

26 protons and 56 neutrons

30 protons and 56 neutrons

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2

A and B are isotopes of different elements.

The two atoms have the same mass.

A and B are isotopes of the same element.

Only atom B is an isotope.

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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?

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

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

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

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

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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 atomic radius from element to element moving down and across the periodic table as indicated by the arrows?

Down = increases, Across = decreases

Down = decreases, Across = increases

Down = increases, Across = increases

Down = decreases, Across = decreases

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2

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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 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 a covalent bond.

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

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

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2

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

Magnesium

Nitrogen

Bromine

Oxygen

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6

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2

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

Oxygen, Sulfur, Selenium group

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

Fluorine, Chlorine, Bromine group

Nitrogen, Phosphorus, Arsenic group

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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)

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

As the electrons absorb energy, they release light.

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

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

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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

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1

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2

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2

What type of bond will these elements form?

Ionic

Covalent

Metallic

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2

What type of bond will these elements form?

Ionic

Metallic

Covalent

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2

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

As - Arsenic

F - Fluorine

N - Nitrogen

Br - Bromine

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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 increases as the number of protons increases.

The force of attraction increases as the distance increases

The force of attraction decreases as the number of protons increases

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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.

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1

Choose the correct name for this molecule: CCl₄

carbon chloride

carbon tetrachloride

tetracarbon chloride

monochlorocarbon

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1

Which of the following would be the best formula for nickel (III) bromide?

Ni₂Br₆

Ni₃Br

Ni₃Br₃

NiBr₃

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2

Which is the correct formula for "disulfer difluoride"?

S₂F

₂SF₂

SF₂

S₂F₂

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1

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

0

2

4

8

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2

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

number of protons

number of neutrons

number of valence electrons

number of electrons

V 2.0 2023 Semester 1 Chem Final (12/20/2023)

A user is constructing an ionic bond between magnesium and fluorine 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 atomic radius 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 beryllium (Be) 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 potassium 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 nickel (III) bromide?

Which is the correct formula for "disulfer difluoride"?

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 magnesium and fluorine 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 atomic radius 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 beryllium (Be) 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 potassium 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 nickel (III) bromide?

Which is the correct formula for "disulfer difluoride"?

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 atomic radius 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 atomic radius from element to element moving down and across the periodic table as indicated by the arrows?

Choose the correct name for this molecule: CCl₄