Ch. 4 The Structre Of The Atom

Question 1

True or false ?

Ancient philosophers regularly performed controlled experiments

Answer 1

False

Question 2

True or false ?

Philosophers formulated explanations about the nature of matter based on their own experiences

Answer 2

True

Question 3

True or false ?

Both Democritus and Delton suggested that matter is made up of Atoms

Answer 3

True

Question 4

True or false ?

Dalton’s atomic theory stated that Adam separate combine or rearrange in chemical reaction

Answer 4

True

Question 5

True or false ?

Daltons atomic theory stated that matter is mostly empty space

Answer 5

False

Question 6

True or false ?

Dalton was correct in thinking that atoms could not be divided into smaller particles

Answer 6

False

Question 7

True or false ?

Dalton’s atomic theory stated that atoms of different elements combine in simple whole number ratios to form compounds

Answer 7

True

Question 8

True or false ?

Dalton thought that all Atoms of a specific element have the same mass

Answer 8

True

Question 9

True or false ?

Democritus proposed that Atoms are held together by chemical bonds but no one believed him

Answer 9

False

Question 10

True or false ?

Daltons atomic theory was based on careful measurements and extensive research

Answer 10

True

Question 11

True or false ?

There are no instruments powerful enough to magnify atoms so that they can be seen

Answer 11

False

Question 12

True or false ?

The Smallest particle of an element that retains the properties of that element is called an atom

Answer 12

True

Question 13

Thomson

Answer 13

Determined the mass to charge ratio of an electron

Question 14

Millikan

Answer 14

Calculated the mass of an electron

Question 15

Rutherford

Answer 15

Proposed the nuclear atomic model

Question 16

True or false ?

The number of neutrons in and Adam is referred to as its atomic number

Answer 16

False

Question 17

True or false ?

The periodic table is arranged by increasing atomic number

Answer 17

True

Question 18

True or false ?

Atomic number is equal to the number of electrons in an atom

Answer 18

True

Question 19

True or false ?

The number of protons in and Atom identifies it as an atom of a particular element

Answer 19

True

Question 20

True or false ?

Most atoms have either a positive or negative charge

Answer 20

False

Question 21

The mass of an electron is

Answer 21

• smaller than the mass of a proton
• smaller than the mass of a neutron
• a tiny fraction of the mass of an atom

Question 22

One atomic mass unit is

Answer 22

1/12 the mass of a carbon - 12 atom

Question 23

The atomic mass of an atom is usually not a whole number because it accounts for

Answer 23

Both the relative abundance and the mass of each of the atoms isotopes

Question 24

Nuclear reaction

Answer 24

A reaction that involves a change in an atoms nucleus

Question 25

Beta radiation

Answer 25

Fast moving electrons

Question 26

Radiation

Answer 26

The Rays and particles that are emitted by a radioactive material

Question 27

Radioactive decay

Answer 27

The process in which an unstable nucleus loses energy spontaneously

Question 28

Beta particles bend which way ?

Answer 28

They bend toward (+) plate

Question 29

Why don’t gamma rays bend ?

Answer 29

They have no charge