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BjU physical science chapter 19 Daniel and Zach section-B Flashcards | StudBud
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BjU physical science chapter 19 Daniel and Zach section-B
what does exothermic mean
a chemical reaction may have occurred if:
BjU physical science chapter 19 Daniel and Zach section-B
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Answers
1
a chemical reaction may have occurred if:
A solid separates from a liquid mixture of chemicals
it explodes
2
what does exothermic mean
producing thermal energy
removing thermal energy
crossing out thermal energy
3
sometimes solid products from reactions settle out of solutions as
false
precipitates
true
liquids
4
chemical changes in matter can be described by equations because of
the law of wasting of matter
true
the law of the conservation of matter
math
5
why are coefficients put in equations
to balance the equations
to be annoying
to make it more complicated
to unbalance the equations
6
What does a chemical equation do
tells what chemicals are present before and after the change
it adds chemicals and their nucleons
tells how many electrons there are
7
what do word equations use
works
the number of uranium atoms multiplied by the electrons
at least two numbers
words
8
substances reacting to form new substances cause
physical changes
chemical changes
problems
theoretical changes
9
what kind of reaction does a precipitate come from
lithium ion reaction
evaporation reaction
precipitation reaction
10
what side of the arrow are the products on
false
left
orange
right
11
if energy is produced, what may have occurred?
true
overreactions
underreactions
chemical reactions
12
in chemical reactions, atoms
are rearranged
destroyed
eliminated
are beleaguered
13
special symbols are included in chemical equations to show
their physical state
R12l/3rf+3a
true
their chemical state
14
chemical equations describe
the color orange
yes
the chemical
what happens in a chemical reaction
15
what is octane rating
the amount of electrons
false
the resistance of gasoline against early ignition
the flamability
16
electrolysis is associated with what kind of reaction
lithium ion validation reaction
composition reaction
decomposition reaction
17
synthesis is associated with what type of reaction
decopmposition
composition
18
what is not included in writing balanced equations
9f-3/2em13-4o
check to see if the equation is balanced
write the word equation
write the formula equation
19
endothermic reactions...
explode
create thermal energyf
absorb thermal energy
20
Chemical changes are caused by:
false
true
substances reacting to form old substances
substances reacting to form new substances
21
chemicals are rearranged into different substances in
hunter's face
alphabetical order
physical reactions
chemical reactions
22
what side of the arrow are the reactants on
left
false
rite
right
23
A chemical reaction may have occurred if:
it changes colors. this is usually permanent
It produces gas without evaporation
energy is produced
it changes temperature
24
formula equations use
words
element symbols
false
true
25
where are coefficients found in equations
below the formulas
in front of the formulas
behind the formulas
on top of the formulas
