37 terms

Chemistry Exam

Which of the following is NOT and example of matter?
(d) smoke
(c) heat
(d) water vapor
An example of an extensive property of matter is _______.
ability to rust
All of the following are physical properties of matter EXCEPT _______.
(a) mass
(b) melting point
(c) color
(d) ability to rust
all of the above
Which of the following are considered physical properties of a substance?
(a) color and odor
(b) malleability and hardness
(c) melting and boiling points
(d) all of the above
A substance that forms a vapor is generally in what physical state at room temperature
Which of the following CANNOT be classified as a substance?
(a) table salt
(b) nitrogen
(c) air
(d) gold
rotting of food
Which of the following is a physical change?
(a) corrosion
(b) evaporation
(d) rotting of food
Which of the following is a herogeneous mixture?
(a) air
(b) steel
(c) salt water
(d) soil
a heterogeneous mixture
Which of the following CANNOT be considered a single phase?
(a) a pure solid
(b) a homogenous mixture
(c) a pure liquid
(d) a heterogenous mixture
they are known as solutions
Which of the following is true about homogeneous mixtures?
(a) they are known as solutions
(b) they consist of two or more phases
(c) they have compositions that never vary
(d) they are always liquid
oil and vinegar
Which of the following is a heterogeneous mixture?
(a) vinegar in water
(b) oil and vinegar
(c )milk
(d) air
salt water
Which of the following is a homogeneous mixture?
(a) salt water
(b) sand water
(c) beef stew
(d) soil
Seperating a solid from a liquid by evaporating the liquid is called _______.
stainless steel
An example of a homogeneous mixture is ________.
(a) water
(b) noodle soup
(c) stainless steel
(d) oxygen
salad dressing
Which of the following items is NOT a compound?
(a) baking soda
(b) sucrose
(c) salad dressing
(d) table salt
they are substances
Which of the following is true about compounds?
(a) They can be physically sperated into their component elements
(b) They have compositions that vary
(c) They are substances
(d)They have properties similar to those of their component elements
A substance that can be seperated into two or more substances only by a chemical change is a(n) _____________.
Which of the following materials is a substance?
(a) air
(b) stainless steel
(c) gasoline
(d) silver
a compound can only be seperated into is components by chemical means
What is one difference between a mixture and a compound?
mixtrures can be seperated physically, while compounds cannot
What distinguishes a substance from a mixture?
The first figure in a properly written chemical symbol always is ______.
What is used for chemical symbols today?
The chemical symbol for iron is _____.
Which of the following represents a compound?
(a) H
(b) H2O
(c) H-3
(d) O-16
elements and compounds
What chemical symbols and formulas represent, respectively?
What substance has a chemical symbol that is derived from a Latin name?
ability to react with oxygen
Which of the following is a chemical property?
(a) color
(b) freezing point
(c) hardness
(d) ability to react with oxygen
In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxcide and water, what was the reactant in this experiment?
All of the following changes to a metal are physical changes EXCEPT:
(a) bending
(b) rusting
(c) melting
(d) polishing
Which of the followind does NOT involve a physical change?
(a) mixing
(b) grinding
(c) melting
(d) decomposing
A chemical change occurs when a piece of wood is _______.
its ability to docompose in hydrogen and oxygen
Which one of the following is a chemical property of water at 4 degrees C?
(a) its color
(b) its temperature
(c) its shape
(d) its ability to decompose in hydrogen
check the composition of the sample before and after the change
What must be done to be certain that a chemical change has taken place?
the food darkens
Which of the following indicates that a chemical chang has happend during cooking?
(a) the food darkens
(b) the water boils
(c) butter is melted
(d) energy is transferred from the stove to the pan
fracture formation
Which of the following does NOT indicate that a chemical change may have taken place?
(a) fracture formation
(b) precipitate formation
(c) gas production
(d) energy transfer
matter is neither destroyed nor created
What happens to matter during a chemical reaction?
stays the same
When an iron nail is ground into powder, its mass ______.