Question 1

What is the name of the metalloid in period four that is in the same family as nitrogen?

Accepted Answer

Arsenic is the metalloid in period four that is in the same family as nitrogen, which is the pnictogens or group 15 of the periodic table.

Question 2

You create a superheavy atom with an atomic number of 120.To which category does it belong?

Accepted Answer

Elements with an atomic number of 120 would belong to the alkaline earth metals group, which is the second group in the periodic table. This group includes elements like beryllium, magnesium, calcium, etc., characterized by having two electrons in their outermost shell.

Question 3

Which of the following compounds contains the most nitrogen atoms per formula?

Accepted Answer

C₈H₁₂N₄O₃ contains 4 nitrogen atoms, which is the highest among the given compounds.

Question 4

Rubidium has two naturally occurring isotopes, ⁸⁵Rb (84.912 amu) and ⁸⁷Rb (86.909 amu).Rubidium-85 is the more abundant isotope (72.17%).Calculate the average atomic mass of Rb.

Accepted Answer

The average atomic mass of Rb can be calculated using the formula: (abundance of isotope 1 * mass of isotope 1) + (abundance of isotope 2 * mass of isotope 2). For Rb, this calculation is (0.7217 * 84.912) + (0.2783 * 86.909) = 61.303 + 24.178 = 85.481 amu, which rounds to 85.47 amu.

Question 5

What is the formula unit mass of chromium(III) oxide (Cr₂O₃)?

Accepted Answer

The formula unit mass of chromium(III) oxide (Cr2O3) is calculated by adding the atomic masses of 2 chromium atoms (each with an atomic mass of approximately 52 amu) and 3 oxygen atoms (each with an atomic mass of approximately 16 amu). This gives a total of (2*52) + (3*16) = 104 + 48 = 152 amu.

Question 6

Which has the highest formula unit mass?

Accepted Answer

The answer of Which has the highest formula unit mass?
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Question 7

You synthesize a superheavy atom that fits into the periodic table below radium.If it were to form an ion, what ionic charge would you predict?

Accepted Answer

The element is below radium, which is in group 2. Therefore, the new element is likely to be in group 1 and form a +1 ion.

Question 8

What ion would you predict element 118 would form?

Accepted Answer

Element 118, known as Oganesson (Og), is a noble gas and is expected to be largely unreactive, making it unlikely to form ions under normal conditions.

Question 9

How many CaCl₂ formula units are in 125 amu of calcium chloride?

Accepted Answer

The answer of How many CaCl₂ formula units are in...

Question 10

You create a superheavy atom with an atomic number of 120.What is probably true about that element?

Accepted Answer

Elements with high atomic numbers, such as 120, are typically metals due to their position in the periodic table, which follows the trend of increasing metallic character as one moves to the left and down the table.

Question 11

What is the formula unit mass of ammonium carbonate (NH₄)₂CO₃?

Accepted Answer

The formula unit mass of ammonium carbonate (NH₄)₂CO₃ is 96.09 amu. This is because the atomic mass of nitrogen is 14.01 amu, the atomic mass of hydrogen is 1.01 amu, the atomic mass of carbon is 12.01 amu, and the atomic mass of oxygen is 16.00 amu. Therefore, the formula unit mass of ammonium carbonate is (2 x 14.01 amu) + (8 x 1.01 amu) + (1 x 12.01 amu) + (3 x 16.00 amu) = 96.09 amu.

Question 12

Gallium has two naturally occurring isotopes with the following masses and natural abundances.Calculate the average atomic mass of Ga.

Accepted Answer

The answer of Gallium has two naturally occurring isotopes with...

Question 13

Identify the element based on the following values for its five isotopes: 179.947 amu (0.12%), 181.948 amu (26.50%), 182.950 amu (14.31%), 183.951 amu (30.64%), and 185.954 amu (28.43%).

Accepted Answer

The element is Tungsten (W). The average atomic mass can be calculated using the given isotopic masses and their natural abundances, which closely matches the atomic mass of Tungsten (~183.84 amu).

Question 14

Identify the element based on the following values for its three isotopes: 38.9637 amu (93.08%), 39.9640 amu (0.012%), and 40.9618 amu (6.91%).

Accepted Answer

The element is potassium (K). The average atomic mass can be calculated using the given isotopic masses and their natural abundances, which closely matches the atomic mass of potassium (~39.1 amu).

Question 15

Which has the highest molecular mass?

Accepted Answer

The answer of Which has the highest molecular mass?
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Question 16

One isotope makes up 97% of all calcium atoms.Which one?

Accepted Answer

The isotope that makes up 97% of all calcium atoms is Calcium-40, which is represented as $^{40}_{20}\text{Ca}$. This corresponds to choice A, where the superscript (140) and subscript (20) indicate the mass number and atomic number, respectively, in the provided notation.

Question 17

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the heavier isotope is the more abundant one.

Accepted Answer

The atomic mass of boron is closer to 11, indicating that the heavier isotope, ¹¹B, is more abundant.

Question 18

Active metals often react with oxygen in air to form a protective surface film that prevents further reaction.Which one of the following formulas for a metal-oxygen combination is NOT correct?

Accepted Answer

MgO₂ is not a correct formula for a metal-oxygen combination. The correct formula for magnesium oxide is MgO.

Question 19

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the lighter isotope is the more abundant one.

Accepted Answer

The answer of For each of the elements below, there...

Question 20

What is the molecular mass of sulfuric acid (H₂SO₄)?

Accepted Answer

Sulfuric acid (H2SO4) has a molecular mass calculated by adding the atomic masses of its constituent atoms: 2(1.01) for hydrogen + 32.07 for sulfur + 4(16.00) for oxygen, totaling approximately 98.1 amu.

Quiz 2: Atoms, Ions, and Molecules the Building Blocks of Matter

What is the name of the metalloid in period four that is in the same family as nitrogen?

You create a superheavy atom with an atomic number of 120.To which category does it belong?

Which of the following compounds contains the most nitrogen atoms per formula?

Rubidium has two naturally occurring isotopes, ⁸⁵Rb (84.912 amu) and ⁸⁷Rb (86.909 amu) .Rubidium-85 is the more abundant isotope (72.17%) .Calculate the average atomic mass of Rb.

What is the formula unit mass of chromium(III) oxide (Cr₂O₃) ?

Which has the highest formula unit mass?

You synthesize a superheavy atom that fits into the periodic table below radium.If it were to form an ion, what ionic charge would you predict?

What ion would you predict element 118 would form?

How many CaCl₂ formula units are in 125 amu of calcium chloride?

You create a superheavy atom with an atomic number of 120.What is probably true about that element?

What is the formula unit mass of ammonium carbonate (NH₄) ₂CO₃?

Gallium has two naturally occurring isotopes with the following masses and natural abundances.Calculate the average atomic mass of Ga.

Identify the element based on the following values for its five isotopes: 179.947 amu (0.12%) , 181.948 amu (26.50%) , 182.950 amu (14.31%) , 183.951 amu (30.64%) , and 185.954 amu (28.43%) .

Identify the element based on the following values for its three isotopes: 38.9637 amu (93.08%) , 39.9640 amu (0.012%) , and 40.9618 amu (6.91%) .

Which has the highest molecular mass?

One isotope makes up 97% of all calcium atoms.Which one?

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the heavier isotope is the more abundant one.

Active metals often react with oxygen in air to form a protective surface film that prevents further reaction.Which one of the following formulas for a metal-oxygen combination is NOT correct?

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the lighter isotope is the more abundant one.

What is the molecular mass of sulfuric acid (H₂SO₄) ?

Quiz 2: Atoms, Ions, and Molecules the Building Blocks of Matter

What is the name of the metalloid in period four that is in the same family as nitrogen?

You create a superheavy atom with an atomic number of 120.To which category does it belong?

Which of the following compounds contains the most nitrogen atoms per formula?

Rubidium has two naturally occurring isotopes, 85Rb (84.912 amu) and 87Rb (86.909 amu) .Rubidium-85 is the more abundant isotope (72.17%) .Calculate the average atomic mass of Rb.

What is the formula unit mass of chromium(III) oxide (Cr2O3) ?

Which has the highest formula unit mass?

You synthesize a superheavy atom that fits into the periodic table below radium.If it were to form an ion, what ionic charge would you predict?

What ion would you predict element 118 would form?

How many CaCl2 formula units are in 125 amu of calcium chloride?

You create a superheavy atom with an atomic number of 120.What is probably true about that element?

What is the formula unit mass of ammonium carbonate (NH4) 2CO3?

Gallium has two naturally occurring isotopes with the following masses and natural abundances.Calculate the average atomic mass of Ga.

Identify the element based on the following values for its five isotopes: 179.947 amu (0.12%) , 181.948 amu (26.50%) , 182.950 amu (14.31%) , 183.951 amu (30.64%) , and 185.954 amu (28.43%) .

Identify the element based on the following values for its three isotopes: 38.9637 amu (93.08%) , 39.9640 amu (0.012%) , and 40.9618 amu (6.91%) .

Which has the highest molecular mass?

One isotope makes up 97% of all calcium atoms.Which one?

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the heavier isotope is the more abundant one.

Active metals often react with oxygen in air to form a protective surface film that prevents further reaction.Which one of the following formulas for a metal-oxygen combination is NOT correct?

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the lighter isotope is the more abundant one.

What is the molecular mass of sulfuric acid (H2SO4) ?

Rubidium has two naturally occurring isotopes, ⁸⁵Rb (84.912 amu) and ⁸⁷Rb (86.909 amu) .Rubidium-85 is the more abundant isotope (72.17%) .Calculate the average atomic mass of Rb.

What is the formula unit mass of chromium(III) oxide (Cr₂O₃) ?

How many CaCl₂ formula units are in 125 amu of calcium chloride?

What is the formula unit mass of ammonium carbonate (NH₄) ₂CO₃?

What is the molecular mass of sulfuric acid (H₂SO₄) ?