Chem

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1

Which of the following statements about gases is false?

a. gases are highly compressible

b. all gases are colorless and odorless at room temperature

c. distances between molecules of gas are very large compared to bond distances

B. all gases are colorless and odorless at room temperature

2

One significant difference between gases and liquids is that______

a. a gas may consist of both elements and compounds

b. gases are always mixtures

c. a gas assumes the volume of its containter

d. a gas is made up of molecules

c. a gas assumes the volume of its container

3

Molecular compounds of low molecular weight tend to be gases at room temperature which of the following is most likely not a gas at room temperature

LiCL

4

An ideal gas equation calculations, expressing pressure in pascals, necessitates the use of gas constant R equal to

8.314 J mol -1K-1

5

The first person to investigate the relationship between pressure of a gas and its volume was

Robert Boyle

6

The force of gas particles against the walls of a container are called

pressure

7

Which stated about atmospheric pressure is false?

a. air actually has weight

b. atmospheric pressure prevents water in lakes, rivers, oceans from boiling away

c. with an increase in altitude, atmospheric pressure increasses as well

C- with an increase in altitude, atmospheric pressure increases as well

8

of the following, _____________is a correct statement of boyles law

C- PV=constant

9

Isothermal means

at constant temperature

10

Which of the following is a valid state of Avogadros law?

v=constant x n

11

Standard temperature and pressure (STP) in the context of gases, refers to

273.15K and 1 atm

12

The kinetic-molecular theory predicts that pressure rises as the temperature of a gas increases because

both the gas molecules collide more frequently with the wall and gas molecules collide more energetically with the wall

13

an ideal gas differs from a real gas in that the molecules of an ideal gas

have no attraction for one another

14

what unit of temperature is used in gas law calculations

kelvin

15

all atoms of a given element have the same

atomic number

16

atoms containing radioactive nuclei are called

radioisotopes

17

what happens to the mass number and the atomic number of an element when it undergoes beta decay?

the mass number does not change and the atomic number increases by 1

18

which is a correct representation of a beta particle

...

19

which is a correct representation of an alpha particl

...

20

which is a correct representation of a positron

...

21

which of the following processes results in an increase in the atomic number

beta emission

22

of the following processes which one changes the atomic number

all of the proccesses change atomic number

23

which type of radioactive decay results in no change in mass number and atomic number for starting nucleus

gamma

24

atoms with the same atomic number and different mass numbers are

are isotopes

25

at approximately what number of protons or neutrons does the 1:1 ration of protons to neutrons start to produce unstable nuclei

20

26

which of the nuclides is most likely to be radioactive

...

27

which of the following can be done to shorten the half life of the radioactive decay of uranium 238

none of the above

28

what type of reaction is known as a thermonuclear reaction?

fusion

29

which of the following forms of radiation can penetrate to the deepest into body tissues

gamma

30

What drives the turbine in a nuclear power plant?

steam

31

Which of the following types of radiation has the highest energy?

y-rays

32

in the sun, nuclei of hydrogen combine to form a larger nucleus and release a great amount of energy. the process is knowsn as

fusion