Chemistry Midterm Practice
Problems:
1.
Place the steps of the scientific method in order from 1-6.
Data
Retest
Hypothesis
Experiment
Observation
Conclusion
2.
Krusty was told that a certain itching powder was the newest best thing on the market.
It even claims to cause 50% longer lasting itches. Interested in this
product, Krusty buys the itching powder and compares it to his usual product. One test subject (A) is sprinkled with the original
itching powder, and another test subject (B) was sprinkled with the Experimental itching powder. Subject A reported having
itches for 30 minutes. Subject B reported to have itches for 45 minutes.
a. Identify the control group, the independent variable, and the
dependent
variable.
Control:
Independent Variable:
Dependent Variable:
b. Explain whether the data supports the advertisements claims about its
product.
Examine the following atom:
201Hg
80
How many protons does this atom have?
_____________________
How many neutrons does this atom have?
______________________
How many electrons does this atom have?
_______________________
Metric Conversions:
1.
Aaron and Noah wanted to have a contest to see which of their paper airplanes could fly the longest distance. Aaron's
plane flew four meters. Noah's plane only flew seventy-nine centimeters. How much further did Aaron's plane fly?
2.
Alexis wanted to build a bookshelf for her room. She needed six boards that are each three meters long and forty-one
centimeters wide. What is the area of each board? (Area=length X width)
3.
During September the average temperature was 21.8 degrees Celsius. What
is the average temperature in Kelvin and in Fahrenheit?
5.
Will a tablecloth that is 155 cm long cover a table that is 1.6 m long? Explain
your answer.
6.
A dollar bill is 15.6 cm long. If 200 dollar bills were laid end to end, how many
meters long would the line be?
7.
The ceiling in Jan’s living room is 2.5 m high. She has a hanging lamp that
hangs down 41 cm. Her husband is exactly 2 m tall. Will he hit his head on the
hanging lamp? Why or why not?
Physical & Chemical Changes: Indicate below if the following
are physicial (P) or chemical (C) changes.
___________ Rusting iron
___________ Digesting a burger
___________ Moldy bread
___________ baking bread
___________ Pounding and shaping
horseshoes
___________ cutting a board
___________ Setting fire to
gasoline
___________ folding paper
___________ Putting acid on
paper
___________ painting a wall
___________ Folding up a jacket
___________ cutting the lawn
___________ Tearing up paper
___________ running a gas engine
___________ writing on a paper
___________ sewing a shirt
___________ Burning a candle
___________
melting wax
___________ Melting Ice
___________ Boiling Water
___________ Melting steel
___________ freezing water
Calculate the atomic mass of oxygen
using the following information:
|
Isotope |
Mass |
% Abundance |
|
Oxygen-16 |
16.00 amu |
99.76% |
|
Oxygen-17 |
17.03 amu |
0.037% |
|
Oxygen-18 |
18.34 amu |
0.204% |
Fill in the following table:
|
Isotopic Notation |
Element Name |
Atomic Mass |
Atomic Number |
# Protons |
#Electrons |
#Neutrons |
|
59 Co
27
|
|
|
|
|
|
|
|
19 F 2+
9 |
|
|
|
|
|
|
|
23 Na 1-
11
|
|
|
|
|
|
|
|
|
Neon |
|
|
|
|
|
|
|
|
|
15 |
|
|
|
Electron Configurations:
1) Write out the complete electron configuration
for:
a. chlorine
b. manganese
c. barium
2) Write out the short-hand (noble gas) electron configuration
for:
a. bromine
b. cobalt
c. radium
3) Identify the element corresponding to the following
configurations:
a. 1s22s22p4
b. 1s22s22p63s23p64s1
c. 1s22s22p63s23p64s23d7
4) Name the element(s) that have:
a. Electrons in a 4s orbital but not in 3d
b. Electrons in a partially-filled 4d level
c. Only unpaired electrons in a 6p orbital
