Chose the correct answer

The subatomic particle that is involved in chemical bonding is the

• proton
• electron
• neutron
• isotope

Which property of water BEST explains how salt is able to dissolve easily in water?

• Water is a polar molecule.
• Water is a nonpolar molecule.
• Water is a compound of hydrogen and oxygen.
• Water has a high surface tension.

How does a compound compare to the elements that make up the compound?

• The properties of a compound depend on the size of the molecule, and not the component elements.
• The properties of a compound are generally similar to the properties of the elements that make it up.
• The properties of a compound are usually very different from the properties of the elements that make it up.
• The properties of a compound depend on the identity of the component elements, and not the chemical bonds they form.

Water moves up the stem of a plant and up a tissue. What chemical property explains this experiment?

• A. Water is a buffer, and works to maintain a pH near 7.
• B. Water molecule carries a charge, and is attracted to the molecules in the plant or tissue.
• C . Water rises through vessels in the stem by capillary action.
• B and C are correct

In the formation of NaCl, Na loses an electron and Cl gains an electron. Which statement is true:

• Na becomes positively charged and Cl becomes negatively charged.
• Cl becomes positively charged and Na becomes negatively charged.
• both atoms will have the same positive charge.
• both atoms will be neutral.

In N2 each nitrogen atom shares 3 electrons with the other atom.

• ionic bond
• single covalent
• double covalent
• triple covalent

The atomic number is the number of

• protons
• electrons
• protons and neutrons
• neutrons

The subatomic particle that has no charge is the

• proton
• electron
• neutron

List two reasons of why water is essential to life?

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What is the function of a buffer in living organisms?

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