Phys sci test 3 quizes XD Flashcards Preview

Physical Science 105 Sem 1 > Phys sci test 3 quizes XD > Flashcards

Flashcards in Phys sci test 3 quizes XD Deck (47):
1

As the temperature of an object decreases, the average speed of its molecules

decreases

2

Absolute zero describes

0 K

3

Your body judges temperature

very poorly, sensing onlly heat flow

4

Which temperature scale measures the absolute temperature of an object?

kelvin

5

Which of the following is NOT a principle of Caloric Theory?

Caloric causes atoms to vibrate

6

As a liquid at its boiling point goes through a phase change to a vapor, heat is absorbed and the temperature

stays the same

7

Doubling the temperature corresponds to doubling the internal energy in the ____________ temperature scale.

Kelvin

8

Anywhere there is a temperature difference, you can expect

energy flow from the hot object to the cold object.

9

In which of the following are the positions of the molecules fixed?

solids

10

Which of the following is most easily compressed?

gases

11

The transfer of energy by collisions between molecules is called

conduction

12

Convection may occur in

liquids and gases

13

Which objects emit radiant energy?

all objects

14

The temperature of an object that is a net absorber of radiation will

increase

15

Which law says that energy becomes less useable (some is wasted)?

second law of thermodynamics

16

Which law says that energy is conserved?

first law of thermodynamics

17

The amount of heat needed to increase the temperature of 1 gram of a substance by 1 degree Celsius is known as

specific heat.

18

what are the three mechanisms for heat flow?

radiation, convection, conduction

19

Liquid water MUST be at its boiling point before any of its molecules can go into the gas phase.

FALSE

20

The originator of the idea that matter is made up of atoms is

Democritus

21

The atomic number of an element is the number of _____________ in the nucleus.

protons

22

Isotopes of an element have DIFFERENT numbers of

neutrons

23

When a pure gaseous element is heated it will produce a _______ spectrum of light

line spectrum

24

The classical model of atoms was not able to explain

the stability of atoms

25

Louis de Broglie originated the idea that electrons might behave as

both particles and waves

26

According to the Bohr model of the atom, light is emitted or absorbed

when electrons change orbits

27

The Bohr model of the atom works

only for hydrogen

28

The quantum mechanics model predicts

the positions of electrons using probability distributions

29

J. J. Thompson discovered the subatomic particle called the

electron

30

The inner shell of an atom can contain no more than

2 electrons

31

The outermost shell of an atom containing any electrons can hold no more than ________ electrons.

8 electrons

32

The vertical columns in the periodic table are called

groups

33

The chemical properties of an atom are determined by

the outer shell electrons

34

Each vertical column of the periodic table includes elements with chemical characteristics that are, in general,

similar

35

An oxygen atom, O, is in group VI and would like to gain ____ electrons in a chemical reaction.

2

36

In a positive ion the number of protons is ____________ the number of electrons.

greater than

37

In a chemical reaction the element sodium, Na, in group I will gain or lose an electron

lose an electron

38

Ionic bonds are formed when

electrons are transferred between atoms

39

A negative ion is formed when an atom

gains an electron

40

Ionic bonds form between

a metal atom and a nonmetal atom

41

Covalent bonds are formed when

atoms share pairs of electrons.

42

Atoms react so that they end up with _____ electrons in their outer shell.

8

43

An alkali metal atom

has one electron in its outer shell

44

The outer electrons of atoms that are involved in chemical bonding are referred to as ________ electrons.

valence

45

An atom is the

smallest unit of an element that can exist alone.

46

first law of thermodynamics

energy(heat)-work=change in internal energy

47

Second law of thermodynamics

heat flows from object of higher temperature to lower temperature