Vocab for Unit 2

Question 1

chemistry

Answer 1

the study of the properties of matter and the changes it undergoes

Question 2

caustic

Answer 2

an agent that burns or destroys living tissue

Question 3

homogenous

Answer 3

a Mixture in which particles are uniformly scattered,

Question 4

heterogenous

Answer 4

a mixture in which the particles are not uniformly scattered

Question 5

element symbols

Answer 5

one or more letters used to represent the name of the substance

Question 6

atomic number

Answer 6

the number of the protons in the nucleus of an atom

Question 7

chemical formula

Answer 7

a formula that shows the number and types of atoms in a molecule

Question 8

chemical reaction

Answer 8

a process in which a substance is changes into one or more new substances

Question 9

endothermic

Answer 9

a chemical reaction in which heat energy is taken from the surrounding

Question 10

inhibitors

Answer 10

substances that slow down or prevent chemical reactions

Question 11

combustion

Answer 11

a highly exothermic combination of a substance with oxygen

requires heat, oxygen, and fuel

Question 12

physical change

Answer 12

a change in form but not in chemical composition no new substances are formed

Question 13

chemical change

Answer 13

a change in which one or more new substances are formed

Question 14

electrolysis

Answer 14

the process of decomposing a chemical compound by passing electric current through it

Question 15

Daltons atomic theory

Answer 15

states that all matter is made up of small particles called atoms, elements cannot be created, destroys, to divided into smaller particles. Compound are created when atoms of different elements join. Atoms of same atoms are identical in mass and size and atoms with one element are differences in mass and Size of the other element.

Question 16

Chemical family

Answer 16

a group of related elements that have similar properties

Question 17

ionic compounds

Answer 17

formed when atoms transfer electrons to or from other atoms

Question 18

binary compounds

Answer 18

compounds made of two elements

Question 19

reactants

Answer 19

the substances that go into a chemical reaction

Question 20

reaction rate

Answer 20

a measure of how fast a reaction occurs

Question 21

corrosion

Answer 21

the process where metals or stone are chemically broken down

Question 22

element

Answer 22

a pure substance made up of one type of particle, cannot be broken down

Question 23

compound

Answer 23

pure substances that are made up of two or more elements chemically combined together

Question 24

electrons

Answer 24

are atomic particles that orbit around the nucleus of an atoms they are usually nucleus charged

Question 25

atomic nucleus

Answer 25

the number of protons in the nucleus of an atom

Question 26

atomic mass

Answer 26

the average mass of an atom of an element

Question 27

molecular compound

Answer 27

formed when atoms share electrons

Question 28

diatomic molecules

Answer 28

molecules made up of two atoms of the same element

Question 29

products

Answer 29

the substances produced by a chemical reaction

Question 30

catalyst

Answer 30

a substance that speeds up a chemical reaction without being used up in a reaction

Question 31

rust

Answer 31

iron oxide a product of the chemical reaction of iron and oxygen and moisture

Question 32

protons

Answer 32

they are positive electric charged atoms usually inside the nucleus

Question 33

neutrons

Answer 33

uncharged particles in the atomic nucleus

Question 34

molecule

Answer 34

smallest independent unit of a pure substance generally a cluster of atoms joined together

Question 35

conductivity

Answer 35

the ability for a substance to carry an electrical current

Question 36

exothermic

Answer 36

a chemical reaction in which heat energy is released to the surroundings

Question 37

enzyme

Answer 37

a special protein molecule that regulates chemical reactions in living organisms

Question 38

galvanization

Answer 38

the process of protecting metals by coating them with a thin layer of zinc.