Classifying Matter
All matter can be classified as what 2 categories?
Pure Substances and Mixtures
Physical properties can be observed or measured without changing the _______ of the substance.
composition
True/False: When you observe a chemical property, it will result in the formation of 1 or more new substances.
True
True/False: A chemical change can be reversed by a physical change.
False
True/False: Compounds have the same/similar properties as the elements they are made of.
False
What are the 2 categories of pure substances?
Elements and Compounds
Which physical properties refers to a substance's ability to transfer heat/electricity?
conductivity
Flammability is the ability to burn in the presence of ______.
oxygen
When a substance experiences a phase change, such as melting or boiling, it is undergoing a _______ change.
physical
Density = mass / volume
A mixture can be classified as a solution, suspension, or colloid based on the....
A)number of particles it contains
B)size of its largest particles
C)color of its particles
D)size of the smallest particles
B)size of its largest particles
Name two examples of substances with high viscosity.
lava
honey
syrup
How likely a substance is to chemically combine with other substances.
Reactivity
Name 3 clues we can look for to identify if a chemical change has taken place
change in color
production of a gas
formation of a precipitate
production of heat/light
change in odor
A solid that forms from the combination of liquids is called a ________.
precipitate
Give me an example of a heterogeneous mixture and a homogeneous mixture.
label which is which
Answers will vary
What does it mean if a substance is malleable?
it can be struck/hammered without shattering
Give an example of a reversible and non-reversible physical change
label which is which
Answers will vary
What is a suspension?
Then, give me an example of one.
Liquid mixture whose particles are too large to fully dissolve. Separate into layers over time.
Ex: Muddy
How are compounds different than mixtures?
compounds are 2 or more elements that are chemically combined in fixed proportions.
mixtures are 2 or more substances that are physically combined and proportions can vary.
How can distillation be used to separate a mixture.
By using differences in boiling point
Explain what caused the Statue of Liberty to change in color over time.
Then, tell me was this a physical change or a chemical change?
Copper reacted with oxygen (oxidized)
this was a chemical change
How can density be used to determine if an object will float or sink?
If the objects density is greater than the liquid it will sink. If the objects density is less than the liquid it will float.