Final

Question 1

which of the following groups contain three elements with stable electron configuration?

Answer 1

helium exon neon

Question 2

Typically atoms gain or lose electrons to acheive

Answer 2

a stable electron configuration

Question 3

Ionization energies tend to

Answer 3

increase from left to right across a period

Question 4

the formation of an ionic bond invovles the

Answer 4

transfer of eloectrons

Question 5

when 2 atoms of the same nonmetal ewact, they often from a

Answer 5

diatonmic metal

Question 6

an elemet that loses 1 valence electron would have a ____ chargre

Answer 6

1+

Question 7

in an electron dot diagram the dots represent

Answer 7

the valence electrons

Question 8

In electron dot diagram, the element’s symbol represents

Answer 8

the nucleus and the inner energy levels

Question 9

what type of elements will form an ionic bond?

Answer 9

metals with nonmetals

Question 10

what type of elements will form a covalent bond

Answer 10

nonmetals with nonmetals

Question 11

what substance would be an example of a polar molecule?

Answer 11

water

Question 12

To clean an oil-base paint out of a brush, a person could use

Answer 12

acetone

Question 13

The water H20 is polar because it contains 2 poalr single bonds and

Answer 13

its molecule has a bent shape

Question 14

Every compound has to have an overall___ charge

Answer 14

neutral

Question 15

the formation of a covalent bond invovles the

Answer 15

sharing of electrons

Question 16

T/F a reactant is formed as a result of a chemical reaction

Answer 16

f

Question 17

T/F the rusting of iron is an example of a chemical reaction

Answer 17

t

Question 18

T/F if energy is given off as a result of a reaction, the total mass of the reactants will not be equal the total mass of the products

Answer 18

f

Question 19

T/F subscripts may be chanfed in irderf to balance a chemical equations

Answer 19

f

Question 20

T/F in a single-replacement reaction, an uncombined element replaces an element that is part of a compound

Answer 20

t

Question 21

T/F in a synthesis reaction, two compounds react to form two compounds

Answer 21

f

Question 22

T/F noth exothefrmic and endothermic reactions require activation energy

Answer 22

t

Question 23

T/F Catalysts are unchaged after being invovled in a chemical reaction

Answer 23

t

Question 24

T/F a synthesis reaction is the opposite of a decomposition reaction

Answer 24

t

Question 25

One mole is a counting unit equal to 6.02 x 10(23rd power)

Answer 25

t

Question 26

WHen a chemical reaction oocur, there is always a change in

Answer 26

both energy and properties of the reacting substance

Question 27

when a chemical reaction occurs

Answer 27

new substances are formed

Question 28

when two substances combine chemically, the properties of the properties of the products are

Answer 28

different from the properties of the reactants `

Question 29

what doesn’t occur as a result of a chemcial reaction

Answer 29

new atoms may form

Question 30

what information does a chemical equation giver about a chemical reaction

Answer 30

both the kinds and numbers of atoms invoved in the reaction

Question 31

The law of converstion of mass states that

Answer 31

in a chemical reaction, the total mass of the reactants must be equal to the total mass of the oroducts

Question 32

A log is burning in a fireplace. If the amount of oxygen reaching the log is decreaae, what will happen

Answer 32

the reaction rate decreases

Question 33

In an exothermic reaction

Answer 33

energy is released

Question 34

When a chemical reaction occurs

Answer 34

an energy change always occurs

Question 35

enzymes increase the rate oc chemical reactions in the body by

Answer 35

acting as catalysts

Question 36

comubstion or burning

Answer 36

is always am exothermic reaction

Question 37

As a result of an endotherimuc reaction

Answer 37

The products have more energy than the reactants

Question 38

while preforming a chemical reacton, a student touches the side of their container holding the reacts and notices that it feels warm. the reaction must be

Answer 38

exothermic

Question 39

in generl, increasing the concentration of reactants causes the reaction to occur

Answer 39

faster

Question 40

Breaking a soid reactant into smaller pieces results in

Answer 40

an increase in the reaction rate

Question 41

An increase in temperature generally increases reaction rate because high-temperature molecules

Answer 41

are likely to collide more frequently

Question 42

A catalyst is a

Answer 42

substance that lowers the activation engery needed for a reaction