Elements vs. Compounds
Mixtures
Density
Properties of Matter
Physical / Chemical Changes
100
A substance that cannot be broken down into simpler substances by chemical means is called a(n) __________.
Please provide an example.
Element
Fe (Iron)
100
True or False:
Elements/Compounds = Pure Substances while mixtures are not
True
100
Define the term density, and provide the mathematical formula associated with this concept.
How much mass is in a volume of a substance
D= m/v
100
Fill in the Matter flow chart below:
a. Matter
b. Pure Substance
c. Mixture
d. Elements
e. Compounds
f. Heterogenous mixture
g. Homogenous mixture
100
Define the term physical change and provide an example.
A physical change affects one or more physical properties of a substance without changing the identity of the substance.
200
A substance made up of atoms of two or more different elements joined by a chemical bond is called a(n) __________.
Please provide an example.
Compound
H2O, CO2, HCL
200
Combination of substances that are not chemically combined is called a _________.
Please provide an example (can be homogeneous or heterogeneous)
Mixture
Heterogenous: Beach sand
Homogenous: Vinegar
200
If 17.4 cm3 of a steel container has a mass of 8.29 g, what is the density of the steel container?
0.48 g/cm3
200
Characteristics that can be observed without changing the identity, are what type of properties? Physical or chemical?
Provide at least 4 examples.
Physical Properties
Shape, color, texture, melting point, boiling point, density
200
Define the term chemical change and provide an example.
A chemical change happens when one or more substances are changed into entirely new substances that have different properties.
300
__________ are represented by chemical formulas.
Compounds
300
Define the term homogenous mixture and provide at least 2 examples.
The components are evenly distributed. The mixture is the same throughout.
EX: Vinegar, aluminum foil, ethanol (rubbing alcohol)
300
A piece of titanium metal has a mass of 67.5 g and a volume of 15 cm3. What is the density of the titanium?
4.5 g/cm3
300
How a substance changes into a new substance by combining with other elements or breaking apart into new substances, is an example of what type of property? Physical or chemical?
Provide at least 2 examples.
Chemical Properties
Flammability
Reactivity
300
True or false:
Physical Changes change the identity of a substance.
False
Physical Changes do NOT change the identity of a substance
Ex. A gold nugget, molten gold, and gold rings are all made of gold atoms though they look physically different
400
How many atoms of Nitrogen are in the chemical formula below:
2 Nitrogen Atoms present in this chemical formula
400
Define the term heterogenous mixture and provide at least 2 examples.
The components are NOT evenly distributed.
EX: Soil, beach sand, bite of salad, bite of pepperoni pizza
400
A sample of a substance that has a mass of 85 g has a volume of 110 cm3. What is the density of the substance?
0.77 g/cm3
400
The capacity of a substance to combine with another substance, is what type of chemical property?
Please provide an example.
Reactivity
When Iron reacts with Oxygen is creates rust
400
True or false, chemical changes can be undone by physical changes.
False
Chemical changes can NOT be undone by physical changes
Ex. You can’t unbake a piece of bread and get the ingredients
500
The smallest unit of a substance that behaves like the substance is a(n)
a. Element c. atom.
b. molecule. d. Compound.
b. molecule
Atoms can combine to make molecules and act as a unit
Molecules- The smallest unit of a substance
500
Explain how mixtures are separated and broken down.
Mixtures can be separated by physical changes, but compounds must be broken down by chemical changes.
Mixtures can be physically separated- Ex. using a centrifuge to separate blood samples.
500
The density of a piece of brass is 8.4 g/cm3. If the mass of the brass is 510 g, find the volume of the brass.
V = M/D
V= 510 g / 8.4 g/cm3
V= 60.71 cm3
500
Provide both a physical property of wood, and a chemical property of wood.
Physical: Brown/tan, has a grainy texture, can be a little sharp, has splinters
Chemical: Is flammable - *When burned, the wood now has new properties and is a new substance.
500
What type of change will form a brand new substance with all new properties? Please provide an example.
Chemical changes form new substances.
Ex. Baking Bread
Chemical Changes can be detected by change in odor or change in color.
Ex. When you burn food you smell the gases given off by a chemical change