Question 1

Which of the following is an organic compound?

Accepted Answer

An organic compound is any compound containing carbon atoms bonded to other atoms. Methane contains a carbon atom bonded to four hydrogen atoms, making it an organic compound. Water, ammonia, and carbon dioxide do not contain carbon atoms bonded to other atoms and are therefore not organic compounds.

Question 2

Individual water molecules orient toward each other because of the ________ bonds that form between them.

Accepted Answer

Hydrogen bonds form between the positively charged hydrogen atoms of one water molecule and the negatively charged oxygen atoms of neighboring water molecules, causing them to orient toward each other.

Question 3

When calcium (Ca++) and chloride (Cl⁻) interact with one another they bond using ________ bonds.

Accepted Answer

Calcium (Ca++) and chloride (Cl⁻) have opposite charges and therefore bond using ionic bonds. Ionic bonds involve the transfer of electrons from one atom to another resulting in the formation of a positively charged ion and negatively charged ion that attract each other to form a stable compound.

Question 4

Which of the following distinguishes ionic bonds from covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in oppositely charged ions that are then held together by electrostatic attraction. Covalent bonds involve the sharing of electrons between atoms to achieve a stable electron configuration. Therefore, ionic bonds hold together oppositely charged atoms, whereas covalent bonds hold together atoms that share electrons. A, B, and D are all incorrect statements about the differences between ionic and covalent bonds.

Question 5

A group of astronauts returning from outer space studied samples taken from their lunar landing. They found that one of their samples was coated with organic compounds. Which of the following statements must be correct about their samples?

Accepted Answer

Organic compounds are compounds that contain carbon atoms, so the fact that the sample had organic compounds means that it must contain carbon atoms. The other choices are not necessarily true based on the given information.

Question 6

The central element found in organic molecules is

Accepted Answer

The central element found in organic molecules is carbon. Organic molecules are molecules that contain carbon and hydrogen, and often other elements such as nitrogen, oxygen, sulfur, and phosphorus. Carbon is unique in its ability to form covalent bonds with many other elements, allowing for the complex and diverse structures found in organic molecules.

Question 7

O₂, also termed atmospheric oxygen, is considered to be a molecule but not a compound. Why not?

Accepted Answer

The answer of O₂, also termed atmospheric oxygen, is considered...

Question 8

Chemists often represent the structure of atoms using p, n, and e to indicate the number of protons, neutrons, and electrons. Which atom would have an atomic weight of 30?

Accepted Answer

The answer of Chemists often represent the structure of atoms...

Question 9

Carbon, hydrogen, and nitrogen are all examples of

Accepted Answer

Carbon, hydrogen, and nitrogen are all elements.

Question 10

The chemical reaction that represents photosynthesis is 6 H₂O + 6 CO₂ à C₆H₁₂O₆ + 6 O₂. What are the reactants?

Accepted Answer

The reactants in the chemical reaction for photosynthesis are listed as 6 H2O (water) and 6 CO2 (carbon dioxide), which combine to form C6H12O6 (glucose) and 6 O2 (oxygen). Therefore, the correct choice is A, which lists H2O and CO2 as the reactants.

Question 11

If iodide ions (I⁻) were dissolved in water, they would be attracted to

Accepted Answer

The answer of If iodide ions (I⁻) were dissolved in...

Question 12

Which of the following is correct about hydrogen bonds?

Accepted Answer

Hydrogen bonds form due to partial positive and partial negative charges on atoms, typically between hydrogen and either oxygen, nitrogen or fluorine. Individually, hydrogen bonds are relatively weak compared to covalent bonds.

Question 13

The subatomic particles that possess a single negative charge and surround the nucleus are the

Accepted Answer

Electrons are negatively charged subatomic particles that surround the positively charged nucleus in an atom. Isotopes refer to atoms with varying numbers of neutrons, while protons are positively charged particles within the nucleus and neutrons are neutral particles within the nucleus.

Question 14

Which of the following is a monomer that can be commonly made from components in Earth's atmosphere?

Accepted Answer

The answer of Which of the following is a monomer...

Question 15

Which of the following is likely to participate in ionic bonding?

Accepted Answer

Li+ is a cation with a low electronegativity that easily loses an electron to form a stable octet configuration. This makes it more likely to participate in ionic bonding. H₂O, He, and C6H12O6 are either neutral or have high electronegativities which make them unlikely to form ionic bonds.

Question 16

In the chemical reaction that forms hydrogen peroxide (H₂O₂), hydrogen and oxygen share electrons creating ________ bonds between the two atoms.

Accepted Answer

Hydrogen and oxygen share electrons in a covalent bond, which is the type of bond formed in the formation of hydrogen peroxide. Peptide bonds involve the sharing of electrons between a carboxyl group and an amino group in proteins, hydrogen bonds involve the attraction between a partially positive hydrogen atom and a partially negative atom in a different molecule, and ionic bonds involve the transfer of electrons from one atom to another to form charged ions.

Question 17

Nitrogen has seven protons, seven neutrons, and seven electrons. What is the atomic mass of nitrogen?

Accepted Answer

The atomic mass is the sum of protons and neutrons in the nucleus. Nitrogen has 7 protons and 7 neutrons, so the atomic mass is 14.

Question 18

Based on the water molecule pictured below, which of the labeled areas possesses a partial negative charge?

Accepted Answer

The answer of Based on the water molecule pictured below,...

Question 19

Which of the following types of bonds hold hydrogen and oxygen atoms together within an individual water molecule?

Accepted Answer

The type of bond that holds hydrogen and oxygen atoms together within an individual water molecule is a polar covalent bond. This is because oxygen is more electronegative than hydrogen, resulting in uneven sharing of electrons and partial charges on each atom. This polar covalent bond is responsible for the unique properties of water, such as its ability to form hydrogen bonds with other water molecules.

Question 20

How many atoms are present in a single molecule of C₈H₁₀N₄O₂?

Accepted Answer

The answer of How many atoms are present in a...

Quiz 2: Chemistry of Life