Final Flashcards

1
Q

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

A

helium exon neon

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2
Q

Typically atoms gain or lose electrons to acheive

A

a stable electron configuration

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3
Q

Ionization energies tend to

A

increase from left to right across a period

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4
Q

the formation of an ionic bond invovles the

A

transfer of eloectrons

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5
Q

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

A

diatonmic metal

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6
Q

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

A

1+

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7
Q

in an electron dot diagram the dots represent

A

the valence electrons

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8
Q

In electron dot diagram, the element’s symbol represents

A

the nucleus and the inner energy levels

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9
Q

what type of elements will form an ionic bond?

A

metals with nonmetals

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10
Q

what type of elements will form a covalent bond

A

nonmetals with nonmetals

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11
Q

what substance would be an example of a polar molecule?

A

water

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12
Q

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

A

acetone

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13
Q

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

A

its molecule has a bent shape

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14
Q

Every compound has to have an overall___ charge

A

neutral

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15
Q

the formation of a covalent bond invovles the

A

sharing of electrons

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16
Q

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

A

f

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17
Q

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

18
Q

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

19
Q

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

20
Q

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

21
Q

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

22
Q

T/F noth exothefrmic and endothermic reactions require activation energy

23
Q

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

24
Q

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

25
One mole is a counting unit equal to 6.02 x 10(23rd power)
t
26
WHen a chemical reaction oocur, there is always a change in
both energy and properties of the reacting substance
27
when a chemical reaction occurs
new substances are formed
28
when two substances combine chemically, the properties of the properties of the products are
different from the properties of the reactants `
29
what doesn't occur as a result of a chemcial reaction
new atoms may form
30
what information does a chemical equation giver about a chemical reaction
both the kinds and numbers of atoms invoved in the reaction
31
The law of converstion of mass states that
in a chemical reaction, the total mass of the reactants must be equal to the total mass of the oroducts
32
A log is burning in a fireplace. If the amount of oxygen reaching the log is decreaae, what will happen
the reaction rate decreases
33
In an exothermic reaction
energy is released
34
When a chemical reaction occurs
an energy change always occurs
35
enzymes increase the rate oc chemical reactions in the body by
acting as catalysts
36
comubstion or burning
is always am exothermic reaction
37
As a result of an endotherimuc reaction
The products have more energy than the reactants
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
exothermic
39
in generl, increasing the concentration of reactants causes the reaction to occur
faster
40
Breaking a soid reactant into smaller pieces results in
an increase in the reaction rate
41
An increase in temperature generally increases reaction rate because high-temperature molecules
are likely to collide more frequently
42
A catalyst is a
substance that lowers the activation engery needed for a reaction