Which of the following are pure substances?
a. solutions
b.compounds
c.homogeneous mixtures
d.colloids
compounds
100
Which of the following is a mixture?
a. carbon dioxide
b. silicon
c.silicon dioxide
d.sand
What is sand?
100
Which of following has the highest viscosity?
corn syrup
milk
water
OJ
What is corn syrup?
100
What separating method can be used when particle size isn't possible?
filtration
distillation
straining
screening
What is distillation?
100
Which of the following is NOT a clue that a chemical change has occurred?
change in color
production of a gas
formation of a precipitate
change in shape
What is change in shape?
200
Which of the following is not a pure substances?
a. milk
b.oxygen
c.water
d.carbon dioxide
milk
200
Which of the following is a characteristic of a mixture?
a.has varying properties
b.has a fixed composition
c.contains only pure substances
d.both a and b
What is has varying properties?
200
A substance has a melting point of 0 and a boiling point of 100 (all in celsius) what is it most likely?
What is water
200
When a physical change in a sample occurs, which of the following does not change?
shape
temperature
volume
composition
What is composition?
200
Which of the following is a chemical change?
ice melting
ice being carved
water boiling
water breaking down into hydrogen and oxygen
What is water breaking down into hydrogen and oxygen?
300
A substance that is made up of only one kind of atom is an
What is element?
300
A mixture that appears to contain only one substance is a
a.compound
b.element
c.heterogenous
d.homogenous
What is homogeneous?
300
A material that is malleable and conducts electricity is most likely?
wood
ice
metal
motor oil
What is metal?
300
Which of the following is a physical change?
saw a piece of wood in half
burn a piece of wood
rust forming on metal
a copper roof change color
What is saw a piece of wood in half?
300
Which of the following is a clue of a chemical change?
iron changes color when heated
gas bubbles form in water boiling
balls of wax form in ears
a gas forms when vinegar and baking soda mix
What is a gas forms when vinegar and baking soda mix?
400
If an unknown substance CANNOT be broken down into simpler substances, it is
a. compound
b. element
c.both a and b
d. neither a or b
What is both a and b.
400
Soy milk is an example of what?
solution
pure substance
colloid
suspension
What is suspension?
400
What physical properties of leather makes it a good material for shoelaces?
high density and low conductivity
durable and flexible
low viscosity and flexibility
hardness and durability
What is durable and flexible?
400
Flammability is a material's ability to burn in the presence of?
hydrogen
nitrogen
helium
oxygen
What is oxygen?
400
One that deals with the external - size, color, odor
What is an extensive property?
500
Water is a compound because it..
a. can be broken down into simpler substances
b.always has 2 hydrogen atoms and 1 oxygen atom
c. is made up of water atoms joined together
d. both a and b
What is both a and b.
500
Which of the following is malleable?
glass
pottery
ice
gold
What is gold?
500
Filtration can be used to separate mixtures based on..?
boiling points
densities
melting points
particle size
What is particle size?
500
A substance that has high reactivity?
a. easily combines chemically with other substances
b. burns in the presence of oxygen
c. displaces dissolved oxygen
d. has a high boiling point
What is easily combines chemically with other substances?
500
A property that deals with the internal - like density