Question 1

Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. Many tried repeatedly to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never succeeded.

Accepted Answer

The answer of Alchemists were medieval scholars and philosophers who...

Question 2

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-links ions of opposite charge

Accepted Answer

Ionic bonds are formed by the attraction of ions with opposite charges.

Question 3

Explain why atoms such as helium (atomic number 2), neon (atomic number 10), and argon (atomic number 18) do not react with other atoms.

Accepted Answer

The answer of Explain why atoms such as helium (atomic...

Question 4

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-forms between atoms with little to no difference in electronegativity

Accepted Answer

Covalent bonds form between atoms that have similar electronegativities and share electrons.

Question 5

What is the difference between strong and weak acids?

Accepted Answer

The answer of What is the difference between strong and...

Question 6

How can radioisotopes be used as tracers to study biological processes?

Accepted Answer

The answer of How can radioisotopes be used as tracers...

Question 7

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-ions retain their respective charges

Accepted Answer

Ionic bonds involve the complete transfer of electrons from one atom to another, resulting in the formation of ions that retain their respective charges.

Question 8

What makes water an excellent solvent?

Accepted Answer

The answer of What makes water an excellent solvent?...

Question 9

​Imagine that you are pouring some table salt (NaCl) into a glass of water and stirring it until the salt has dissolved. Given this scenario, match the following terms with the best description.​
-the salt

Accepted Answer

The salt is the solute, as it is being dissolved in the solvent (water) to create a solution.

Question 10

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-stabilizes the characteristic structures of biological molecules such as DNA and proteins

Accepted Answer

Hydrogen bonds stabilize the characteristic structures of biological molecules such as DNA (e.g. base pairing) and proteins (e.g. secondary, tertiary, and quaternary structures). Ionic and covalent bonds also play important roles in biological molecules but do not specifically stabilize their structures.

Question 11

Refer to chemical equation shown here to explain why carbon dioxide dissolved in water acts as a buffer.
H2O + CO2 ←→ H2CO3 ←→ H+ + HCO3

Accepted Answer

The answer of Refer to chemical equation shown here to...

Question 12

A water molecule is polar but has no charge. What makes water molecules polar and how does this polarity contribute to hydrogen bonding?

Accepted Answer

The answer of A water molecule is polar but has...

Question 13

​We all know the saying "It's not the heat, it's the humidity." Why is the cooling effect of sweat ineffective on humid days?

Accepted Answer

The answer of ​We all know the saying "It's not...

Question 14

Polonium is a rare element with 33 radioisotopes. The most common one, ²¹⁰Po, has 82 protons and 128 neutrons. When ²¹⁰Po decays, it emits an alpha particle, which is a helium nucleus (two protons and two neutrons). ²¹⁰Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of ²¹⁰Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of ²¹⁰Po change into after it emits an alpha particle?

Accepted Answer

The answer of Polonium is a rare element with 33...

Question 15

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-attraction between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond

Accepted Answer

A hydrogen bond is an attraction between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond. Ionic bonds occur between ions with opposite charges, while covalent bonds involve the sharing of electrons between atoms.

Question 16

What causes ocean acidification? What are some effects of ocean acidification?

Accepted Answer

The answer of What causes ocean acidification? What are some...

Question 17

Draw a shell model of an uncharged nitrogen atom (atomic number 7).

Accepted Answer

The answer of Draw a shell model of an uncharged...

Question 18

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-sharing of electrons between two atoms

Accepted Answer

Covalent bonds involve the sharing of electrons between two atoms. Ionic bonds involve the transfer of electrons between two atoms, while hydrogen bonds involve an attraction between a partially positive hydrogen atom and a partially negative atom.

Question 19

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-single, double, or triple bonds can exist between two atoms

Accepted Answer

Single, double, or triple bonds can only exist in covalent bonds. Ionic bonds involve the transfer of electrons, while hydrogen bonds involve the attraction between a partially positive hydrogen atom and a partially negative atom in a different molecule.

Quiz 2: Lifes Chemical Basis

Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. Many tried repeatedly to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never succeeded.

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -links ions of opposite charge

Explain why atoms such as helium (atomic number 2), neon (atomic number 10), and argon (atomic number 18) do not react with other atoms.

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -forms between atoms with little to no difference in electronegativity

What is the difference between strong and weak acids?

How can radioisotopes be used as tracers to study biological processes?

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -ions retain their respective charges

What makes water an excellent solvent?

Imagine that you are pouring some table salt (NaCl) into a glass of water and stirring it until the salt has dissolved. Given this scenario, match the following terms with the best description. -the salt

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -stabilizes the characteristic structures of biological molecules such as DNA and proteins

Refer to chemical equation shown here to explain why carbon dioxide dissolved in water acts as a buffer. H2O + CO2 ←→ H2CO3 ←→ H+ + HCO3

A water molecule is polar but has no charge. What makes water molecules polar and how does this polarity contribute to hydrogen bonding?

We all know the saying "It's not the heat, it's the humidity." Why is the cooling effect of sweat ineffective on humid days?

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -attraction between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond

What causes ocean acidification? What are some effects of ocean acidification?

Draw a shell model of an uncharged nitrogen atom (atomic number 7).

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -sharing of electrons between two atoms

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -single, double, or triple bonds can exist between two atoms

Quiz 2: Lifes Chemical Basis

Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. Many tried repeatedly to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never succeeded.

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -links ions of opposite charge

Explain why atoms such as helium (atomic number 2), neon (atomic number 10), and argon (atomic number 18) do not react with other atoms.

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -forms between atoms with little to no difference in electronegativity

What is the difference between strong and weak acids?

How can radioisotopes be used as tracers to study biological processes?

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -ions retain their respective charges

What makes water an excellent solvent?

​Imagine that you are pouring some table salt (NaCl) into a glass of water and stirring it until the salt has dissolved. Given this scenario, match the following terms with the best description.​ -the salt

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -stabilizes the characteristic structures of biological molecules such as DNA and proteins

Refer to chemical equation shown here to explain why carbon dioxide dissolved in water acts as a buffer. H2O + CO2 ←→ H2CO3 ←→ H+ + HCO3

A water molecule is polar but has no charge. What makes water molecules polar and how does this polarity contribute to hydrogen bonding?

​We all know the saying "It's not the heat, it's the humidity." Why is the cooling effect of sweat ineffective on humid days?

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -attraction between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond

What causes ocean acidification? What are some effects of ocean acidification?

Draw a shell model of an uncharged nitrogen atom (atomic number 7).

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -sharing of electrons between two atoms

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -single, double, or triple bonds can exist between two atoms

Imagine that you are pouring some table salt (NaCl) into a glass of water and stirring it until the salt has dissolved. Given this scenario, match the following terms with the best description. -the salt

We all know the saying "It's not the heat, it's the humidity." Why is the cooling effect of sweat ineffective on humid days?