Biology Chapter Two Review

An inhibitor is a chemical compound that helps to speed up a reaction.

The tendency of energy to spread out

A(n) ___ compound is held together by opposite electrical charges..

Sand floating in seawater is an example of a solution.

The physical stuff that makes up the universe

Water has properties important to life that many other liquids lack.

Physical or chemical change? chopping wood

The smallest individual part of an element

Physical or chemical change? Gasoline powering a car's engine

Only living things are made of matter.

A substance that produces hydrogen ions in solution

Since animals can't make energy, they require ___ energy from food.

Physical or chemical change? A carton of milk turning sour

Because water molecules have regions of asymmetric charge, they are considered ___ molecules

A chemical equation shows the reactants and the products formed by that reaction.

Enzymes help a chemical reaction proceed by ___ the activation energy

The interaction between hydrogen atoms on adjacent molecules is known as hydrogen bonding.

Covalent compounds form when atoms ___ electrons.

Brownian motion is caused by the collisions between particles.

A pure substance made of only one kind of atom

The smallest part of a covalent compound

A substance that produces hydroxide ions in solution

The attraction of one water molecule for another is known as ___

Chemistry is the study of matter and the changes it experiences

Which of the following is not a reason why carbon is important for life?

A liquid mixture in which the solute is uniformly distributed

Carbohydrates, lipids, proteins, and nucleotides are all ___ compounds

When a peptide bonds forms between two amino acids, ___ is released.

Organic compounds all contain the element ___

Brownian motion causes matter to spread out, a process called

Physical or chemical change? Making a paper airplane

The main purpose of carbohydrates for living things is for ___

The smallest part of a covalent compound is a formula unit

Physical or chemical change? Melting ice in a glass

A pure substance made of 2 or more chemically combined elements