Molecules, Building Blocks Of Life

2.

All molecules are made up of

Hydrogen
Atoms
Compounds
Other Molecules

Correct Answer

A. Atoms

Explanation

Molecules are composed of atoms. Atoms are the basic building blocks of matter and combine together to form molecules. Therefore, all molecules are made up of atoms.

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3.

A molecule has different properties from the elements from which is was made.

True
False

Correct Answer

A. True

Explanation

When elements combine to form a molecule, they undergo a chemical reaction which results in the formation of a new substance with different properties than the individual elements. This is because the arrangement and bonding of atoms in a molecule leads to the emergence of new chemical and physical properties. Therefore, it is true that a molecule has different properties from the elements from which it was made.

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4.

Which of these is a true statement?

Molecules are always moving
All molecules are the same mass
All molecules are the same size

Correct Answer

A. Molecules are always moving

Explanation

Molecules are always moving because they possess kinetic energy. This movement is due to the constant motion of the atoms within the molecule. Even at extremely low temperatures, molecules still exhibit some level of movement, although it may be reduced. Therefore, it can be concluded that molecules are always in motion.

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5.

Why do atoms bind together to form molecules?

To create a nucleus with a neutral charge
To fill their valence electron shell and become a more stable substance
To share an equal number of protons

Correct Answer

A. To fill their valence electron shell and become a more stable substance

Explanation

Atoms bind together to form molecules in order to fill their valence electron shell and become a more stable substance. The valence electron shell is the outermost shell of an atom, and when it is filled, the atom becomes more stable because it has achieved a full complement of electrons. By bonding with other atoms, atoms can share, gain, or lose electrons to achieve this stable electron configuration. This bonding allows atoms to form more complex structures and create a wide variety of substances with different properties.

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6.

When two or more atoms bond together they form a

Mixture
Molecule
Compound
Atom

Correct Answer

A. Molecule

Explanation

When two or more atoms bond together, they form a molecule. A molecule is a group of atoms that are held together by chemical bonds. In a molecule, the atoms can be of the same element or different elements. This bonding allows the atoms to share electrons and create a stable structure. Therefore, the correct answer is molecule.

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7.

What is the name of this molecule?

Hydroxide (OH)
Water (H2O)
Oxygen (O2)
Hydrogen (H2)
Both C and D

Correct Answer

A. Water (H2O)

Explanation

The correct answer is Water (H2O) because water is a molecule composed of two hydrogen atoms bonded to one oxygen atom. The molecular formula for water is H2O, indicating the presence of two hydrogen atoms and one oxygen atom in each molecule. Hydroxide (OH) is a polyatomic ion consisting of one oxygen atom and one hydrogen atom, but it is not the name of this specific molecule. Oxygen (O2) and hydrogen (H2) are both elements, not molecules, and do not accurately describe the composition of this molecule. "Both C and D" is an incorrect option as it combines two elements (carbon and hydrogen) that are not present in this molecule.

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8.

Molecules can be easily separated.

True
False

Correct Answer

A. False

Explanation

Molecules are chemically bonded making them very difficult to separate. Only highly trained scientists with special equipment can separate molecules.

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9.

Molecules are held together by what kind(s) of bonding?

Ionic Bonding
Covalent Bonding
Metallic Bonding
Both A and B
Both B and C

Correct Answer

A. Both A and B

Explanation

Molecules are held together by both ionic bonding and covalent bonding. Ionic bonding occurs when there is a transfer of electrons between atoms, resulting in the formation of ions that are attracted to each other. Covalent bonding occurs when atoms share electrons, creating a strong bond between them. Both types of bonding contribute to the stability and structure of molecules. Metallic bonding, on the other hand, is not involved in holding molecules together, but rather is responsible for the bonding within metals.

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10.

Molecules join together by

Sharing electrons
Distributing the atoms' mass evenly
Sharing protons
Sharing neutrons
Both C and D

Correct Answer

A. Sharing electrons

Explanation

Molecules join together by sharing electrons. This is because electrons are negatively charged particles that orbit around the nucleus of an atom. When atoms come close to each other, their outermost electrons can interact and be shared between the atoms, creating a chemical bond. This sharing of electrons allows atoms to achieve a more stable electron configuration, resulting in the formation of a molecule. Sharing protons or neutrons is not a common way for molecules to join together. Therefore, the correct answer is sharing electrons.

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Molecules, Building Blocks Of Life

Which of the following is an example of a substance that is composed of molecules?

Quiz Preview

All molecules are made up of

A molecule has different properties from the elements from which is was made.

Which of these is a true statement?

Why do atoms bind together to form molecules?

When two or more atoms bond together they form a

What is the name of this molecule?

Molecules can be easily separated.

Molecules are held together by what kind(s) of bonding?

Molecules join together by