Obj Worksheet
1. Define chemistry and describe its 5 major divisions.
Study of the composition of substances and the changes they undergo
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Organic – study of matter that is made up of carbon
Inorganic – study of matter that is not made up of carbon
Analytical –study of the composition matter
Physical – study of theories and experiments that describe the behavior of matter
Biochemistry – the study chemistry and how it relates to living organisms
2. Explain the relationship among the terms hypothesis, experiment, theory, and law in the scientific
method
a. They all are steps used in science to solve problems each builds on the one before.
3. Distinguish between matter and a substance.
a. Matter is anything that has volume and mass – A substance is a particular type of
matter that has a uniform and definite composition.
4. Name and characterize the three states of matter
a. Solid – definite shape and volume – high IMF low KE
b. Liquid – shape of container definite volume – IMF weaker KE greater than solids
c. Gas – matter that flows – takes shape and volume of container – no IMF high KE
5. Identify physical changes of matter.
a. Breaking, cutting, melting, freezing, boiling, grinding, condensing – substance changes
without changing its composition
6. Classify a sample of matter as a substance or a mixture, as homogeneous or heterogeneous
a. Hand cream mixture Homogeneous
b. Apple
mixture Heterogeneous
c. Copper
Substance
d. Ink
e. flower
f. glue
homogeneous
heterogeneous
homogeneous
7. Explain the difference between an element and a compound
a. An element is the simplest form of matter that cannot be broken down by ordinary
chemical means – Compound is made up of elements that can be broken down
chemically into the elements that make them up.
8. Fill in the blanks
Aluminum
Nitrogen
Copper
Al
N
Cu
O
C
S
oxygen
carbon
sulfur
9. Compare physical and chemical changes in matter
a. In a physical change the substance changes its shape, size, or form – it does not
change its composition. In a chemical change the composition of the substance
changes – still have the same elements but they are combined to form new
substances
10. State the Law of Conservation Mass
a. In a Physical or chemical change mass is neither created nor destroyed it is
conserved.