c1 hwk due 19/5/23

Question 1

describe the arrangement of particles in a solid

Answer 1

regular pattern, very close together and vibrate about a fixed position

Question 2

what is a chemical change

Answer 2

when a new product is formed

Question 3

define an atom

Answer 3

smallest unit of matter, containing protons, neutrons and electrons

Question 4

give three things that the particle model doesn’t account for

Answer 4

forces between particles; size of particles; space between particles

Question 5

name the three subatomic particles and their charges

Answer 5

proton : +1
neutron : 0
electron : -1

Question 6

define mass number

Answer 6

number of protons + number of neutrons in an atom

Question 7

define atomic number

Answer 7

number of protons in an atom

Question 8

define an ion

Answer 8

charged particle formed by the loss or gain of electrons

Question 9

define isotope

Answer 9

atoms with the same number of protons and a different number of neutrons

Question 10

what is the typical radius of an atom

Answer 10

1x10^-10