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chemistry phc 01.3 & 02.all Flashcards | StudBud
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chemistry phc 01.3 & 02.all
chemistry phc 01.3 & 02.all
32 terms
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scientific method, states of matter, elements/compounds/mixtures, reaction basics
Flashcards
32 cards
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Questions
32
Answers
1
What is the symbol for mercury?
Cu
Hg
Mo
Er
2
A container of chlorine gas is opened in a laboratory. The chlorine will
form a puddle on the floor
remain, frozen, in the container
cure the diseases of those who breathe it
spread throughout the room
3
If ammonia is a compound of nitrogen and hydrogen,
it can have any % N and any % H
it can travel at the speed of light
it can be separated into N & H
it is an element on the periodic table
4
A ______ changes shape when moved to another container but stays the same volume.
mixture
solid
liquid
compound
5
In a bottle of salad dressing there are two layers. The dressing is
heterogeneous
homogeneous
a compound
an element
6
Which of the following is a chemical change?
chewing gum being stretched thin
dew forming on the grass
an ice cube cracking
sodium and chlorine forming salt
7
Color and density are _____ properties, whereas mass and volume are _____ properties.
chemical, physical
extensive, intensive
intensive, extensive
phyiscal, chemical
8
Which of the following is a chemical property of gasoline?
It doesn't mix with water
It is flammable
It easily vaporizes
It is a liquid
9
Johnny feeds two groups of rats two different kinds of food and measures their weight later.
Rat weight is the manipulated variable.
Food type is the dependent variable.
Rat weight is the responding variable.
Food type is the constant variable.
10
Although it is the most common state of matter in the universe, _____ is rare on Earth.
solid
plasma
liquid
gas
11
Which of the following changes the composition of a material?
condensation
a chemical reaction
a phase change
fusion
12
Pentane and butane can be separated by ______ because they have different boiling points.
combustion
filtration
distillation
nuclear fusion
13
Brass, a mixture of Cu & Zn,
has the chemical formula "CuZn"
is a compound
must be 29% Cu & 50% Zn
can be 10% Zn & 90% Cu
14
Which of the following can NOT be separated into two different substances?
bronze
platinum
salt
water
15
acid + base --> salt + water. 60 g of acid react with ____ to make 20 g salt and 70 g water.
30 g base
10 g salt
30 g salt
10 g base
16
Manipulated variable =
responding variable
independent variable
dependent variable
resultant variable
17
What is designed to kill a hypothesis but might help it become a theory instead?
filtration
gravitational lensing
experiment
distillation
18
What did alchemists do, centuries ago?
create tons of matter out of empty space
prove that matter makes space bend
turn lead into gold
invent various lab equipment items
19
A scientific experiment should
be designed to prove that you are right
be conducted in secrecy and should remain a secret
have as many manipulated variables as possible
have one manipulated variable
20
What do theories and laws have in common?
Both are supported by experiments
Both are explanations of why things happen
Neither has been tested by experiments
Both are 100% true forever, beyond any doubt
21
A bunch of gold atoms are stuck together in a lump, vibrating but not wandering. The lump is
a liquid
a solid
a gas
a plasma
22
The chemicals that something is made of =
composition
mass
volatility
volume
23
The purpose of an experiment is
to prove that you are correct
to show that something is just a theory
to turn a theory into a law
to test a hypothesis
24
Saline solution, a mixture of salt and water,
is a pure substance
can have any % NaCl
is an element on the periodic table
must have a salt:water ratio of 1:1
25
A chemist might collaborate with
the speed of light
a physicist
a compound
a beaker
26
Ricky stops smoking, adopts a vegan diet, and starts exercising to see if his weight will drop.
His hypothesis will become a theory
He has too many manipulated variables
He needs more manipulated variables
His theory will become a hypothesis
27
Which of the following is a physical change?
photosynthesis
ice melting
hydrogen burning
iron rusting
28
The ancient ________ spoke Latin and their capitol was in what is now _______.
Romans, Italy
Egyptians, South Africa
Aztecs, France
Germans, Korea
29
Which of the following is a compound?
C
Mo
He
KBr
30
"Ferrum" is the ______ word for "iron".
Chinese
Japanese
Aztec
Latin
31
Menudo is
a mixture
a compound
an element
a pure substance
32
What is the Latin word for "tin"?
stannum
aurum
ferrum
kalium
