TEST 1

Question 1

atomic mass unit

Answer 1

mass of atoms

Question 2

atomic number

Answer 2

protons and neutrons

Question 3

exact number

Answer 3

counted

Question 4

inexact number

Answer 4

any quantity obtained by not counting

Question 5

accuracy

Answer 5

closest to the true answer

Question 6

precision

Answer 6

replicate measurements

Question 7

substance

Answer 7

form of matter that has a specific chemical composition and distinct, observable properties.

Question 8

mixture

Answer 8

combination of two or more substances

Question 9

homogenous mixture

Answer 9

composition of the mixture is uniform throughout

Question 10

heterogeneous

Answer 10

composition is not uniform

Question 11

physical process

Answer 11

separating mixtures without changing the identity of any substance

Question 12

extensive property

Answer 12

amount of matter: mass and volume

Question 13

intensive property

Answer 13

does not depend on the amount go matter: density and melting point

Question 14

molecule

Answer 14

matter made of atoms

Question 15

pure substance

Answer 15

a single kind of matter that cannot be separated into other kinds of matter by any physical means.

Question 16

isotopes

Answer 16

same number of protons but different number of neutrons

Question 17

alkali metals

Answer 17

3, 11, 19, 37, 55, 87

Question 18

diatomic element

Answer 18

two atoms

Question 19

molar mass v atomic mass

Answer 19

molar mass is the average of many elements of the compound; atomic mass is the mass of the atom

Question 20

explain the concept of a mole and how it is sometimes useful for describing the number of individual units in a sample

Answer 20

the mole unit allows us to express amounts of atoms and molecules in visible amounts that we can understand

Question 21

electrostatic relationship

Answer 21

EF is directly related to the product of the charges and inversely related to the square of the separation distance.

Question 22

relative potential energies and stabilities

Answer 22

the lower potential energy the more stable it is

Question 23

explain why the interaction of two particles will have potential energy values that are positive negative and zero

Answer 23

the charges of the particles determines the value. if there are two positive the value will be positive, if the charges are opposite then it will be negative and when two particles are very far a[art there is zero.

Question 24

diatomic elements

Answer 24

hydrogen, nitrogen, chlorine, oxygen, fluorine, bromine, iodine

Question 25

atoms to moles

Answer 25

divide be avogrados

Question 26

atoms to mass

Answer 26

multiply by the amu then divide by avogrado

Question 27

is atomic number super or su- script?

Answer 27

subscript

Question 28

is mass number super or sub- script

Answer 28

superscript

Question 29

condensation

Answer 29

gas to liquid

Question 30

the wave with the greatest frequency has the _____ wavelength

Answer 30

shortest

Question 31

electromagnetic spectrum , long to short wavelength

Answer 31

radio, microwave, infrared, visile, ultraviolet, x-ray , gamma

Question 32

sublimation

Answer 32

solid to gas

Question 33

celcisu to kelvin

Answer 33

+273