Biology 2 Test

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

• mass

• elements

• matter

• energy

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

• nucleus

• ion

• proton

• electron

An ion is

• an atom with more protons than electrons

• an atom with more electrons than protons

• either A or B

• neither A or B

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

• element

• ion

• neutron

• chemical

Temperature is a measurement of

• the amount of matter in an object

• how much energy an object has

• the amount of energy stored in chemicals

• the speed of moving particles

In an exothermic reaction, the products have ______ than the reactants

• more energy

• less energy

• the same amount of energy

• none of these

Which of the following is true about enzymes

• they are catalysts

• they are large molecules

• they lower the activation energy of a reaction

• all of these

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

• substrate

• catalyst

• inhibitor

• reducer

Organic compounds all contain the element

• hydrogen

• nitrogen

• carbon

• oxygen

Chemistry is the study of matter and the changes it experiences

• true

• false