chemistry midterm

Question 1

what does sold look like

Answer 1

compact

Question 2

what does a liquid look like

Answer 2

loos but still close to other

Question 3

what does gas look like

Answer 3

moving and everywhere

Question 4

a mixture is always with

Answer 4

homo and hetero

Question 5

a pure substance is always with

Answer 5

compound and element

Question 6

Democritus

Answer 6

greek philosopher who thought atoms were invisible and indestructible

Question 7

john dalton

Answer 7

created the basis for the modern atomic theory

Question 8

j.j Thomason

Answer 8

cathode ray experiment discovered electrons in plum pudding mode

Question 9

Ernest Rutherford

Answer 9

gold foil experiment discovered of the nucleus and protons

Question 10

Niels bohr

Answer 10

discovered the electrons are held within energy levels around the nucleus

Question 11

Erwin Schrodinger

Answer 11

equation for the probability of an electron being found along a single axis

Question 12

whats an isotope

Answer 12

Atoms with the same number of protons but different numbers of neutrons

Question 13

whats an ion

Answer 13

Atoms with a charge

Question 14

alpha decay

Answer 14

4
He
2

Question 15

beat decay

Answer 15

0
e
-1

Question 16

gamma decay

Answer 16

0
y
0

Question 17

fusion

Answer 17

Two light atoms are combined to form a heavier atom

Question 18

fission

Answer 18

A heavy atom is split into two lighter atoms

Question 19

how can we use nuclear chemistry in cancer treatment

Answer 19

by utilizing radioactive isotopes, called radionuclides, to deliver targeted radiation directly to tumor cells, effectively damaging their DNA and causing them to die,