Chemistry chap. 2
compound
2 or more elements combined
mixture
2 or more states of matter (solid, gas, and liquid) mixed together
A solution is an example of a(n): A. homogeneous mixture B. heterogeneous mixture C. element D. Compound E. none of the above
A
An example of a compound is: A. Water. B. Beryllium C. Iron. D. air E. None of the above.
A
Ed plans to investigate whether aluminum, magnesium, and copper metals have the ability to react with oxygen when heated with a Bunsen burner. What type of change is he investigating and which piece of equipment should he make sure he knows the location of before starting the experiment? A. Chemical change; fire extinguisher B. Chemical change; first aid kit C. Physical change; fire extinguisher D. Physical change; first aid kit
A
Which of the following properties of sulfur are chemical properties? A. It reacts with hydrogen when heated. B. It is a yellow solid at room temperature. C. It is soluble in carbon disulfide. D. Its density is 2.97 g/cm3 E. It melts at 112°C.
A and C
physical change
A change in a substance that does not involve a change in the identity of the substance
A compound: A. can be physically separated into its elements B. has a variable composition C. has properties similar to those of its elements D. can be chemically separated into its elements
D
The student begins an experiment by collecting several measurements about a metal rod and performs some calculations. Which represents an intensive property of the metal? A. It has a mass of 22.43 g. B. It measures 10.4 cm. C. The volume is calculated to be 3.56 cm3 D. The density is calculated to be 6.30 g/cm3
D
Which of the following is an extensive physical property of a substance? A. density B. color C. odor D. mass E. melting point
D
Which of these is an extensive property of a water sample? A. colorless B. density = 1.00g/mL C. transparent D. volume
D
An indication that a chemical change has occurred is A. the formation of bubbles. B. formation of a precipitate. C. the dissolving of a solute D. Only A, B, and C are correct E. Only A and B are correct.
E
Law of Conservation of Mass
Matter is not created nor destroyed in any chemical or physical change
Element
a single item from the periodic table
chemical change
any change in which 1 or more substance are converted to different substances with different properties
heterogeneous mixture
are unevenly mixed and you can see the physical separation or the different pieces of parts to make up the mixture
Substances that cannot be broken down into other substances by ordinary chemical changes are classified as: a. phases b.element c. compounds d.solutions e. mixtures
b.
not a chemical change a. cooking an egg b. adding sugar to coffee c. burning a candle d. forming rust on steel knives
b.
Intensive properties ex.
color, density, odor, melting point, and hardness, etc.
extensive properties
depend on the amount of matter that is present
intensive properties
depends in the type of matter
the bird is red paper has the ability to burn ethanol has a boiling point of 78.37
physical pro. chemical pro. physical pro.
What are the 3 states of matter?
solid, liquid, gas
physical properties
the characteristics of a substance that can be observed or measured without changing the substance
homogeneous mixture
the same throughout
Extensive properties ex.
volume, mass, size, weight, and length
You have 25.0 mL of orange, liquid bromine. Which part of this statement refers to qualitative information? A. 25.0 mL B. orange, liquid
B
Which of the following is a chemical property of iron? A. Density = 7.874 g/mL B. Iron melts at 1808 K. C. Iron rusts in moist air. D. Iron is soft when pure.
C
chemical properties
Characteristic that cannot be observed without altering the substance
