Question 4 Which item is a mixture? a copper b table salt c carbon d air Question 5
A sample of matter that contains only one kind of atom would be classified as _____. a a homogeneous mixture b an element c a heterogeneous mixture d a compound
Question 6
Which action will make a solid solute dissolve more slowly in a liquid solvent? a decreasing the solvent’s temperature b stirring the solution c crushing the solute into small pieces Question 7
A chemical change is required to separate the components of a _____. a heterogeneous mixture b compound c homogeneous mixture Question 8
Solutions and heterogeneous mixtures have _____. a parts that are chemically bonded to one another b parts that are physically mixed c individual parts that can be seen without a microscope
Question 9
Matter that is always composed of the same combination of atoms is a _____. a solution b substance c mixture Question 10
Adding more solute to a solution changes the _____. a polarity of the solute molecules b solubility of the solute c concentration of the solution
Question 11
Saturated is a term that is used to describe _____. a polarity b pH. c solubility d concentration Question 12
Evaporation, a physical change, could be used to separate the components of a(n) _____. a substance b mixture c element d compound
Question 13
Which phrase describes the parts of a solution but NOT the parts of a heterogeneous mixture? a evenly mixed b easily visible with the unaided eye c always a single type of atom d chemically bonded Question 14
Which item could be separated into its component parts only by using a chemical change? a granite b air c table salt d salt water
B: 60 min
C: 45 min
D: 15 min
The answer is B) 60 min.