Describing Matter Question Preview (ID: 36220)
Describing Physical And Chemical Changes, Physical And Chemical Properties And Chemical Reactions.
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Melting ice is an example of a(n)
a) physical change
b) chemical change
c) ionic bond
d) release of covalent molecules
You calculate the density of pure water to be 1 g/ml. You have just found
a) a chemical property of water
b) the number of valence electrons in water
c) the kinetic energy of the molecules of water
d) a physical property of water
You put a beaker of ice on a hot plate and turn it on high. For 5 minutes the temperature of the ice remains the same. Why ?
a) The hot plate is not working properly.
b) The thermometer is broken.
c) The energy going into the beaker is being used to increase the speed of the molecules if water,
d) The energy going into the beaker is being used to separate the molecules of water.
When you add energy to a substance, what two things can occur to the molecules of the substance?
a) They can either slow down or move closer together.
b) They can either speed up or move farther apart.
c) They can either break apart or form new compounds.
d) They can either increase in number or change phase.
In the chemical equation Na + Cl - NaCl, what is (are) the reactant(s)?
a) Na
b) Cl
c) NaCl
d) Both Na and Cl
In the chemical equation Na + Cl - NaCl, what is (are) the product(s)?
a) Na
b) Cl
c) NaCl
d) Both Na and Cl
Matter is anything that has
a) mass and volume
b) mass and weight
c) energy
d) None of these are correct
The study of matter and how matter changes is called
a) Biology
b) Physics
c) Chemistry
d) Geology
Which below is a chemical property?
a) Wood can burn.
b) Paper is white.
c) The freezing temperature of water is 0 degrees Celsius.
d) Ice is a solid.
Which below is a physical property.
a) Iron can rust.
b) Wood can rot.
c) The boiling point of water is 100 degrees Celsius.
d) Baking soda will react with vinegar.
When you combine two substances chemically and create a new substance, you have created a(n)
a) mixture
b) element
c) solution
d) compound
What is the difference between a compound and a mixture.
a) A compound can only be separated chemically while a mixture can be separated physically.
b) A mixture is physically combined while a compound is chemically combined.
c) In a compound, the substances have to be in a set ratio, while in a mixture they do not.
d) All of these.
A mixture in which you can see the individual particles is a(n)
a) heterogeneous mixture
b) homogeneous mixture
c) solution
d) compound
Salt is made of sodium, an explosive solid, and chlorine a poisonus gas. Why can we eat salt?
a) Because our bodies can change the substances.
b) Because the properties of a compound are different from the properties of the substances which they are made of.
c) Because the sodium can cancel out the effects of the chlorine.
d) Because they are a mixture, and mixtures can't hurt you.
Is the chemical equation on the board balanced?
a) No, there are 2 hydrogen atoms on the reactants side and 4 on the product side.
b) No, there are 2 oxygen atoms on the reactant side and only 1 on the product side.
c) No, there are 2 hydrogen atoms on the product side and only 1 on the product side.
d) Yes, it is balanced.
In the chemical equation Na + Cl - NaCl, if I have 10 grams of Na and 20 grams of Cl, how much NaCl should I have?
a) 15 grams
b) 10 grams
c) 30 grams
d) None, they will cancel each other out.
A single kind of matter that always has a specific makeup and a specific set of properties.
a) homogeneous mixture
b) heterogeneous mixture
c) pure substance
d) solution
A pure substance made of two or more elements chemically combined in a set ratio.
a) element
b) compound
c) mixture
d) solution
A characteristic of a substance which can be observed without changing it into another substance.
a) chemical property
b) physical property
c) solution
d) relative property
A characteristic of a pure substance that describes its ability to change into different substances.
a) chemical property
b) physical property
c) solution
d) relative property
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