HomeWork 3

Question 1

Law of conservation mass

Answer 1

Matter is neither created nor destroyed(mass of reactants = mass of product)

Question 2

Atomic Theory (1)

Answer 2

each element is made of tiny indestructible particles called atoms

Question 3

Atomic theory(2)

Answer 3

All atoms from the same element have the same mass and properties that distinguish them from atoms of other elements.

Question 4

Atomic Theory (3)

Answer 4

Atoms from one element differ properties from atoms of all other elements

Question 5

Atomic Theory(4)

Answer 5

Atoms combine in simple, whole_number ratios to from compounds

Question 6

Atomic Theory(5)

Answer 6

Atoms of one Element cannot change into atoms from another element. In chemical reactions, atoms change the way they are bond together with other atoms from a new substance

Question 7

Law Of Definit proportions

Answer 7

All samples of a given compound have the same proportions of the constituent elements.

Question 7

Subatomic Particles

Answer 7

Protons,Neutrons and electrons in atoms

Question 8

Isotopes

Answer 8

atoms with the same number of protons but different number of neutrons

Question 9

Atomic Mass Unit

Answer 9

Common unit: express Atomic masses

Question 10

Define Neutral Matter

Answer 10

(no charge) has the same number of protons as it has electrons

Question 11

Protons

Answer 11

Positively charged particles found within the nucleus

Question 12

Neutrons

Answer 12

Neutral particles within the nucleus

Question 13

Atomic number

Answer 13

the number of protons in an atoms nucleus. this defines the element

Question 14

Natural abundance

Answer 14

the percentage of each isotope found in a sample of a given element

Question 15

Mass Number

Answer 15

protons + neutrons

Question 16

Atomic Mass

Answer 16

The average mass of an element’s atom ( Different from mass number)

Question 17

Empirical formula

Answer 17

Given Simples ratio of elements(typically used for ionic compound)

Question 18

Molecular formula

Answer 18

Given exact number of each element. Typically used for molecular compounds.

Question 19

Structural formula

Answer 19

Molecular formula that shows how atoms are connected

Question 20

Isomers

Answer 20

Compounds with the same Chemical formula but different molecular structures