Chemistry of Life Vocab

Question 1

a substance that cannot be broken down into simpler substances

Answer 1

Element

Question 2

the smallest particle of an element with the properties of that element

Answer 2

Atom

Question 3

positively charged center of an atom composed of neutrons and protons

Answer 3

Nucleus

Question 4

atoms of the same element with different numbers of neutrons

Answer 4

Isotope

Question 5

two of more different elements linked chemically in definite proportions

Answer 5

Compound

Question 6

forms when atoms share electrons

Answer 6

Covalent bond

Question 7

group of atoms held together by covalent bonds

Answer 7

Molecule

Question 8

atom that gains or loses electrons and has an electrical charge

Answer 8

Ion

Question 9

forms when ions with opposite charges are attracted to each other

Answer 9

Ionic bond

Question 10

all the chemical reactions that occur within an organism

Answer 10

Metabolism

Question 11

combination of substances in which individual components retain their own properties

Answer 11

Mixture

Question 12

mixture in which one or more substances(solutes) are distributed evenly in another substance(solvent)

Answer 12

Solution

Question 13

a standard measure of the hydrogen ions in a solution

Answer 13

pH

Question 14

a compound that releases hydrogen ions(pH<7)

Answer 14

Acid

Question 15

a compound that releases hydroxide ions (pH>7)

Answer 15

Base

Question 16

reaction that releases energy

Answer 16

Exothermic reaction

Question 17

anything that has mass and occupies space

Answer 17

Matter

Question 18

particles with the same mass as protons but with no charge

Answer 18

Neutron

Question 19

reaction that uses/absorbs energy

Answer 19

Endothermic reaction

Question 20

particles with a relatively large mass and positive charge

Answer 20

Proton

Question 21

the number of protons in an element

Answer 21

Atomic number

Question 22

particle with a small mass and a negative charge

Answer 22

Electron

Question 23

the number of protons plus the number of neutrons

Answer 23

Mass number

Question 24

release ions other than hydrogen or hydroxide ions

Answer 24

Salt