MIDTERM EXAM REVIEW SHEET, CHEMISTRY IA
Name: ___________________________________________________ Date: _______________________________ Block: ________________
1.
Define:

Element –

Compound –

Hypothesis –

Atomic Number –

Mass Number –

Isotopes –

Ions (what is the difference between a cation and an anion?) –

Valence Elections –

Planetary Model –

Accuracy –

Precision –
2.
What does it mean to be organic? What element do you need to be considered “organic”?
3.
What is the scientific method? What are the 5 steps we discussed?
4.
What is the difference between a law and theory?
5.
What is the difference between a chemical change and a physical change? Provide two examples of each.
6.
What is the Law of Conservation of Mass? How can this be used to predict quantities of products that should be formed in a
chemical reaction?
7.
What is a reactant and what is a product in a chemical reaction?
8.
What are the differences between solids, liquids, and gases? Describe the molecular motion, average kinetic energy, volume, size,
and shape of these three phases. Draw a picture of a solid, liquid, and gas and their relation to one another on the molecular scale.
9.
What is the SI system? Why is it so much easier to use than the American System (especially in science)?
10. Why does America still use the English System?
11. What are the SI BASE UNITS for the following:
a.
Mass: ____________ b.
Volume: ____________
c.
Length: ____________
MIDTERM EXAM REVIEW SHEET, CHEMISTRY IA
12. Compare and contrast homogeneous and heterogeneous mixtures. Give 3 examples of each.
13. Math and Calculations:
a.
b.
Scientific Notation
i. 898,990,000
ii. 5.5323x104
iii. 842,399
iv. 3.43x10-2
iv. 0.0000345
vi. 9.9x10-6
vii. 0.00000009884
viii. 3.2345x107
SigFigs and calculations
i. How many SigFigs are in the following:
A. 0.0090990
D. 1.0950009
B. 123.33
E. 0.098012
C. 9.91452x1023
F. 738.000
ii. Round each of the previous values to 3 SigFigs:
A.
D.
B.
E.
C.
F.
iii. Perform the following calculations expressing your answers in the correct number of SigFigs:
A. 7.87 x 8.8 =
C. 100.9 – 0.293 =
B. 5.55 + 18.8 =
D. 9008.9 / 55.0 =
14. What is accuracy? What is precision? Which is more important? Can you be both accurate and precise? (You may want to draw
pictures to supplement your understandings).
a.
If the actual value is 9.70g and you measure three trials: 9.24g, 9.21g, and 9.22g. is your data accurate, precise or both?
b.
Actual is 5.22mL and you measure 5.21mL, 4.90mL, and 5.88mL. Accurate, precise, or both?
15. Read the following measurements:
Length: _________________
Mass: _________________
Volume: ________ & ________
16. What is Density? What is the relationship between mass, volume, and density?
a.
Calculate the density of a sample with a mass of 15.7g and a volume of 12.2mL
b.
What volume will 10.09 grams of aluminum take up? (you will need to use your books to find the density)
17. Who was John Dalton? What did he propose about the atom? What did his work show?
18. What was Rutherford’s Gold Foil Experiment? What did this tell about the atom (what was his conclusions?)
MIDTERM EXAM REVIEW SHEET, CHEMISTRY IA
19. Who proposed the following models: (be able to draw them and explain each fully) – what does each state???
a.
The Solid Sphere Model –
b.
The Planetary Model –
c.
The Quantum Mechanic Model –
20. What is atomic number? What does it represent in an atom?
21. What is the mass number? How do you calculate a mass? What does this number tell you?
22. Why are mass numbers not nice whole numbers (why are they decimal values?)
23. How many valence electrons does each of the groups on the Periodic Table have?
24. What are the charges of each of these groups? Why? Explain how they obtain these charges and how they relate to the number of
valence electrons.
25. Where are the alkali metals, alkaline earth metals, halogens, and noble gases located?
26. What is the difference between qualitative and quantitative data? Prove two examples of each
27. What are the 5 branches of chemistry? What does each study / do?
28. What separation techniques would you use to separate the following:
a.
Sand and Iron
b. Sand and Salt
c. Salt and Water
d.
Sand and Water
29. Conversions:
a.
How many inches are in 8.89 meters?
b.
How many pounds are in 455 decigrams?
c.
How many centigrams are in 4.333 kilograms?
d.
How many mL are in 24 fl.oz?
30. Complete the following table of protons, electrons, and neutrons
Name
Symbol
Atomic #
Mass #
O-2
63
Iron
Bromine
# of e-
# of N
8
Cu
Phosphorus
# of P
27
65
P-3
7
35
7
45