BJU Biology Chapter 2 Test (5th Ed.)

Decaying vegetation is an example of a physical change.

Proteins are organic polymers consisting of chains of

Which reaction would be best helped by a catalyst?

A base forms hydrogen ions in a solution.

What is the tendency of energy to spread out?

Organic compounds all contain the element

Unsaturated fats contain only single bonds.

In an exothermic reaction, the products have _____________ than the reactants.

Temperature is a measurement of

The outermost electrons in an atom are called valence electrons.

A chemical equation shows both the reactions and the products.

Which reaction has reactants with the lowest energy content?

The main purpose of carbohydrates for living things is for

Which of the following is true about enzymes?

Which reaction releases the most energy?

The molecule that fits the active site of an enzyme is known as an activator.

Lipids include

Covalent compounds form when atoms ____________ electrons.

What are the main kinds of organic molecules found in living things?

Does this graph show and endothermic or exothermic reaction?

What is a substance that produces hydrogen ions in solution?

All organic compounds contain carbon.

Which reaction diagram show the least activation energy?

What is a pure substance made of only one type of atom?

Bonds between atoms store chemical energy.

Which reaction(s) is (are) exothermic?

Endothermic reactions yield products with more energy that that contained in the reactants.

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

What is the smallest part of a covalent compound?

Nucleic acids contain instructions that cells use to build proteins.

The physical stuff that makes up everything in the universe is known as

Which of the following is not a part of a molecule

Chemistry is the study of matter and the changes it experiences.

Is gasoline powering a car's engine a physical or chemical change?

A substance that decreases the activity of an enzyme is a(n)

Seawater is a solution of water, mineral, and gases. What are the solutes in the solution?

A pure substance made of only one kind of atom is a(n)

The attraction of one water molecule for another is known as

Which reaction diagram shows the most activation energy?

Temperature is the measure of the average speed at which particles move.

Dissolving is the process by which one substance breaks another substance into smaller pieces.

Is running a tree branch through a wood chipper a physical or chemical change?

Photosynthesis is an example of a physical change (plants use sunlight and CO₂ to make glucose)

What is a substance that produces hydroxide ions in solution?

Which reaction(s) is (are) endothermic?

What element(s) is (are) found in every carbohydrate?

The most significant element for living things is oxygen.

Which of the following is not a smaller part of an atom?

What is the smallest individual part of an element?

Brownian motion is motion cause by the collisions between particles.

Is ice melting on a pond a physical or chemical change?

Which of the following is not a molecule?

What is a pure substance made of two or more chemically combined elements?

In a solution, the substance that does the dissolving is called the solute.

Catalysts increase the amount of activation energy necessary for a reaction.

Is a carton of milk turning sour a physical or chemical change?

Sodium and chlorine chemically combine to form sodium chloride. What is (are) the reactant(s)?

An atom is classified by the number of protons in its nucleus.

Electrons are the basic building blocks of matter.

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

Nucleotides hook together to form both

When a peptide bond forms between two amino acids, __________ is released.

Glucose and sucrose are examples of lipids.

Ionic bonds are formed when atoms

Is crumpling a piece of paper a physical or chemical change?

Which reaction releases the least energy?

Proteins are polymers made of amino acids connected by peptide bonds.

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

Water reacts with many substances because it is a non polar molecule.

An ion is