Honors Chemistry
• 1) Explain how you can take the mass of a
substance, such as salt on the electronic
balance without pouring the salt directly on
the balance. (Be specific in your answer).
• 1) You complete a lab on the boiling point of water. You
do 3 trials and get the boiling point to be 99.80⁰C,
99.90⁰C, and 100.00⁰C. The actual boiling point of water
is 100.00⁰C. Is your data accurate, precise, both, or
neither?
• 2) Seeing Madison shoot 10 shots is an example of
which type of measurement.
• An experiment is being completed to determine which
type of light bulb will burn the longest.
• 3) Determine the independent variable in the experiment.
• 4) Give an example of an inference.
• 1) Compare and contrast between scientific
theory and scientific law.
• 2) Harley and Halle do an experiment to
determine the melting point of a substance. They
do the lab and get results of 2.00, 2.10, 2.25,
2.30, 2.36, and 5.00 degrees Celsius. The actual
melting point of the substance is 0.00 degrees
Celsius. Are their results precise, accurate, both,
or neither?
• Which brand of razor works the best?
• Research is completed to see which brand of razor
gives the closest shave. Three groups are chosen.
Each group has the same number of men, same
race of men, same type of facial hair, uses the
same type of shaving cream, and uses the same
method of shaving. One group of men do not
shave.
• 1) Determine what the dependent variable in the
research is.
• 2) What is the independent variable?
• 3) Name the control for the research.
• 1) How many days do you have to prepare
for the end of the world if NASA makes an
announcement that an Asteroid is going to
hit the Earth in 7,500.00 minutes?
• 1) A high school basketball court is
2560.00 cm from baseline to baseline.
How many times would you need to run
down the court to travel a total of 2.00
miles during practice?
• 1) Determine the temperature (in
Fahrenheit) in this room if you are told it
is 293.00 K.
• 2) The freezing point of Mercury is
-38.83 ºC. During an experiment, Michael
and Jonah find the freezing point of the
element to be -40.00 ºC. What is the
percent error of their experiment?
• 1) We are going to place 21 boxes from the
floor to the ceiling. Each box measures to
be 145.14 mm. What is the height in feet
of the room from the floor to the ceiling?
• 1)
• 1) The height of a basketball is 260.35
mm. We build a new rack to put the
basketballs in that is 3.40 feet high. How
many basketballs can fit in one rack?
• Using the Handout covering Scientific
Notation and Scientific Figures, complete the
following.
• 1) Complete Numbers 1, 2, 3, 7, 8
• 2) Determine the answers for 4 and 9 (Do
the math)
• 1) How many mm are in 3.57x10-5 km?
• 2) During an experiment, we find the mass
of a piece of copper to be 156.1 grams and
the volume of copper to be 17.5.
Determine the density of copper. (Density=
mass/volume).
• Make sure you put the answer with the
correct number of significant figures.
• 1) Determine the mass of an object that
has a volume of 250 mL and a density of
19.31 g/mL.
• Just multiply the numbers.
• Make sure you put the answer with the correct
number of significant figures.
• 2) Describe an atom in your own words.
• 1) How do you determine the identity of
an element?
• 2) Determine the volume of a substance
given the density of the substance is 8.92
and the mass is 2.3x103 g.
• To find volume: mass/density
• Make sure you put the answer with the correct
number of significant figures.
• 1) Which subatomic particle has a mass of
0 and is found outside the nucleus?
• 2) Why can’t the number of protons of an
element ever change?
• 3) What is one of the findings that Dalton
stated in his Atomic Theory that is still
proven correct today?
• 1) An element of Magnesium loses 1 electron and it has
a mass number of 25 and 13 neutrons. Determine the
charge of Magnesium.
• 2) What changes in an atom of an element to make it
become charged?
• 3) If an element has a mass number of 39, 20 protons,
and a charge of 2.
• How many neutrons does the element have?
• Determine the electrons the element has?
• Name the element.
• 4) Which subatomic particle has a mass of 1 and a
charge of 0?
• 1) If a neutral atom gains 3 neutrons and loses 3
electrons, is the atom neutral, positive, or negative?
• 2) An atom of Carbon has 6 protons, 7 neutrons, and 4
electrons.
• What is the mass number of Carbon?
• Determine the charge on Carbon.
• If it has a charge, what is this charged particle called?
• 3) The following 2 atoms represent ____________________.
• N-14
• N-15
• 4) Which of the following changes in the isotopes of an
element?
• (Mass Number, Atomic Number, Neutrons, Protons)
• 1) List at many relevant, distinct facts
as you can about the following isotope
of Phosphorus.
30
15
-3
P
• 1) Determine the
charge of the atom if
one of the electrons
were removed. What
is the name of the
element?
• 2) An unknown
element has two
isotopes with atomic
masses and percent
abundances of 6.00
(7.50%) and 7.00
(92.50%). What is the
name of the element?
Element
Cesium
Atomic
Number
Mass
Number
Electrons
Neutrons
134
Thorium
Selenium
Protons
+1
90
79
Charge
36
143
• 2) An unknown element has a mass
number of 8, a charge of positive 1, 2
electrons, and 5 neutrons. What is the
name of the element?
• 3) K-38 represents a/an
________________.
• 4) Explain why the atomic number of an
element is important.
• 1)