CHEMISTRY

Question 1

MATTER

Answer 1

anything that has mass and occupied space.

Question 2

ATOMS

Answer 2

atoms make up matter. atoms are small particles you can’t see

Question 3

MOLECULES

Answer 3

molecules are 2 or more atoms combined

Question 4

solid

Answer 4

the particles are super close together and uniform

Question 5

homogenous mixtures/solution

Answer 5

one phase. can’t see the individual parts. (ex. apple juice).

Question 6

heterogeneous mixtures/mechanical mixtures

Answer 6

at less 2 phases. can see individual parts. (ex. vegetable soup or pizza).

Question 7

alloys

Answer 7

mixtures of metals

Question 8

combustion

Answer 8

combustion is a chemical reaction in which a fuel “burns” or reacts to oxygen

Question 9

corrosion

Answer 9

corrosion is the breakdown of metals resulting from reactions with chemicals from the environment.

Question 10

beneficial corrosion

Answer 10

metal reacting with O2 in the air to produce a tough outer oxide.

Question 11

rust

Answer 11

corrosion of iron speeds up when in the presence of water and oxygen or electrolytes like salt.

Question 12

gases in the atmosphere

Answer 12

78% nitrogen, 21% oxygen, 1% other

Question 13

metalloids

Answer 13

have properties of both metals and non-metals

Question 14

electrons

Answer 14

negative change (the # of protons is equal to # of electrons)

Question 15

protons

Answer 15

positive charge (the # of protons is equal to # of electrons)

Question 16

neutrons

Answer 16

neutral charge

Question 17

atomic number

Answer 17

the number of protons in an atom’s nucleus

Question 18

atomic mass

Answer 18

the number of protons and neutrons in the nucleus

Question 19

chemical formula

Answer 19

a notation that shows the type and number of atoms in a pure substance. ex. (N2 has 2 nitrogen or H2O has 2 hydrogen and 1 oxygen.)

Question 20

molecular element

Answer 20

an element that has 2 of the same element (ex. N2, O2, H2, Cl2)

Question 21

molecular compounds

Answer 21

molecular compounds consist of 2 or more elements. they form when non-metals react with non-metals

Question 22

ionic compounds

Answer 22

they form when non-metals react with metal atoms. the compounds are made of charged particles called ions.

Question 23

ions

Answer 23

ions form when an atom loses or gains one or more electrons without changing its number of protons.

Question 24

cation

Answer 24

a positively charged ion. This happens when an atom loses its electrons but keeps the amount of protons.

Question 25

anion

Answer 25

anion is a negatively charged ion. this happens when atoms gain negatively charged electrons.