1. What is density? Density is defined as its mass per unit volume.
2. What are the densities of the following substances given the following masses and volumes?
2-4: Precipitation Reactions
NaOH (OH )
NaCl (Cl )
a cloudy pink
Protons, Neutrons, Electrons
2-10: Counting Protons, Neutrons, and Electrons
Record the mass of the sample. Mass = 7.9026 g Sc
1. Calculate the moles of Sc contained in the sample.
0.17579 moles Sc
2. Calculate the atoms of Sc contained in the sample.
2-6: Counting Atoms
Mass = 33.1230
1. Calculate the moles of Pb contained in the sample.
0.16 moles Pb
2. Calculate the atoms of Pb contained in the sample.
9.64 x 1022atoms Pb
3. Repeat steps 2-5 for uranium. Record the mass, the moles, and the atom
Single Replacement Reaction Stoichiometry and Percent Yield
1. Write the balanced equation for the reaction of aluminum with copper(II) sulfate
solution.2Al(s) + 3CuSO4(aq) -> Al2(SO4)3(aq) + 3Cu(s)
2. What is the mo
What are the two main types of error? What effect can they have on results?
Systematic and random error.
Systematic error causes measurements to be inaccurate by a certain value in a particular
direction, broken down into to absolute
Periodicity and the Periodic Table
1. Give an example of a type of real-world item that is organized or sorted in a
A pyramid it is stacked from smallest to largest.
2. How can items in the previous qu
Investigating Chemical Reactions
Balance each of the following equations, and classify each of the reactions by type.
Type of Reaction
The Fundamentals of Calorimetry
1. What is calorimetry? What is a calorimeter?
Calorimetry is measuring the change in energy of a chemical reaction.
Calorimeters are apparatus used to measure the change in energy .
2-3: Strong and Weak Electrolytes
6. Electrolytes are compounds that conduct electricity in aqueous solutions. Which compounds in your
table are electrolytes?
1. Most elements exist as components of compounds rather than in a free state. Explain why. This is
because atoms are more stable if their outer shell is full
2. Use colored pencils to lightly shade each element in
Title:_Chem 1411- 41400- Observations of a Chemical Change LAB
Objective: [Hint: Be sure to read the Exploration from labpaq, to write about the Objective]
1. If the yeast could be completely removed from the experimental apparatus and dried, what
should its mass be? Why?
2. In the
Balancing Chemical Equations
1. Define atom, element, molecule, and compound. Atoms are the smallest matter and
are made from particles called protons. An element is a substance that is made entirely from
one type o
QUIZ 7-THERMODYANMICS & THERMOCHEMISTRY
1) At what velocity (m/s) must a 20.0 g object be moving in order to possess a kinetic energy of
B) 100 102
D) 1.00 103
2) Objects can possess energy as _.
(a) endothermic energy
QUIZ 4 STOICHIOMETRY
1) In the following list, only _ is not an example of matter.
D) elemental phosphorus
E) table salt
2) What is the physical state in which matter has no specific shape but does have a specifi
Biology 1406 Lab
Biology 1406 Hybrid
_A_ 1. The sister chromatids are moving _A_ 9. The chromosomes are moving
toward the poles of the cell.
_P_ 2. The nu
2-1: Names and Formulas of Ionic Compounds
2-5: Counting Atoms
51.0616 g Au
1. Calculate the moles of Au contained in the sample.
0.26 moles Au
2. Calculate the atoms of Au contained in the sample.
1.57 x 10 23 atoms Au
2-6: Counting Atoms
Mass = 33.1230
1. Calculate the moles of Pb co
2-2: Writing Balanced Precipitation Reactions
What color is the precipitate? Write a correct balanced net ionic equation for the reaction.
Ag2CO3 Silver Carbonate
What color is the precipitate? Write a correct balanced net ionic equation for t
2-9: Counting Molecules
Which of the compounds contains the most total number of atoms? NH4Cl
Data and Results Table
Moles of compound
1.1945 g C12H22O11
2-8: Counting Molecules
Record the mass of the sample. Mass =
0.9774 g NaCl
Calculate the moles of NaCl contained in the sample.
Calculate the number of atoms for each element in NaCl.
Calculate the moles of each element in NaCl.
0.017 moles NaCl
2-14: Converting Concentrations to Different Units
7.0795 g NaHCO3
0.08431 moles NaHCO3
7. If the density of the solution is 1.047 g/mL, calculate the molality of the solution in units of mol/kg.
2-13: Creating a Solution of Known Molarity
1. Determine the liters of solution in the cylinder and record the data in the data table.
2. Determine the moles of NaHCO3 in the sample and record the data in the data table.
Biologically a molecule shape is determined by position of atoms, and shape/structure affects
Which of the following represents one of the emergent properties of water that lend itself to making life on Earth
COVERS3/4 OF THE PLANET