Biology ch 6 Chemistry of Life

Front

What is a pure substance that cannot be broken down into other substances by physical or chemical means?

Back

element

Front

If a neutral atom contains 18 protons, it also contains ______ electrons.

Back

18

Front

What forms when two atoms share 2 electrons?

Back

single covalent bond

Front

A ______________ increases the rate of a reaction by lowering the activation energy needed to start the reaction.

Back

catalyst

Front

A ______________ binds to an enzyme's active site.

Back

substrate

Front

The total number of atoms in a molecule of glucose, C6H12O6, is ____.

Back

24

Front

Find Carbon, Sodium, and Oxygen on your periodic chart. Which of these are most likely to form a ionic bond and why?

Back

* Sodium (Na) is most likely to form ionic bonds. It has one electron in its outer shell that it wants to give away.

Front

A molecule of water (H2O) has _____________covalent bonds.

Back

2

Front

Of these, which is an example of a chemical reaction?
ice melting, sugar dissolving in water, iron rusting, water evaporating

Back

Iron rusting

Front

Two substances are combined and heat is produced. Does this prove that a chemical reaction has occurred?

Back

Yes, energy is released