Chemistry Midterm
combustion, corrosion, decomposition, change of color, production of gas, change in energy, etc
chemical changes
result in the formation of new substances
chemical changes
not uniform in composition
heterogenous mixture
What state of matter has a definite volume and takes the shape of its container?
liquid
amount of matter an object contains
mass
physical blend of two or more components
mixture
part of a sample having uniform composition and properties
phase
changes of state, temperature, volume, dimensions, boiling, evaporation, condensation, melting, freezing, *dissolving, etc.
physical changes
these are changes in the matter caused by a particular action that does not change the composition of a substance
physical changes
can be observed and measured without changing a substance into another substance.
physical properties
a substance formed in a chemical reaction
product
gaseous state of substance that is a liquid or solid at room temperature
vapor
substance that cannot be changed into simpler substances by chemical means
element
Which of the following does NOT involve a physical change? a. mixing b. melting c. grinding d. decomposing
a
all of the following are physical properties of a substance in the liquid state EXCEPT... a. indefinite volume b. definite mass c. not easily compressed d. indefinite shape
a
Which of the following cannot be classified as a substance? a. table salt b. air c. nitrogen d. gold
b
Which of the following is NOT an example of matter? a. air b. heat c. smoke d. water vapor
b
Which of the following items is NOT a compound? a. baking soda b. salad dressing c. sucrose d. table salt
b
Which state of matter takes both the shape and the volume of its container? a. solid b. liquid c. gas d. both b and c
b
A chemical change occurs when a piece of wood... a. is split b. is painted c. decays d. is cut
c
Which of the following materials is a substance? a. air b. gasoline c. stainless steel d. silver
c
Which state of matter is characterized by having a definite shape and a definite volume? a. gas b. liquid c. solid d. all of the above
c
an example of extensive property is... a. temperature b. pressure c. mass d. hardness
c
can only be observed when a substance is changed into another substance (reaction). It is the capacity of a substance to undergo a specific reaction
chemical properties
process in which substances are changed into different substances
chemical reaction
composed of two or more substances chemically combined in a fixed proportion
compound
why does a golf ball have more mass than a tennis ball?
contains more matter
Which of the following is a chemical property? a. color b. hardness c. freezing point d. ability to react with Oxygen
d
Which of the following is a heterogeneous mixture? a. air b. salt water c. steel d. soil
d
all of the following are physical properties of matter EXCEPT... a. mass b. color c. melting point d. ability to rust
d
a process in which a liquid is boiled to produce a vapor that is condensed again into a liquid
distillation
