Review Questions

Grade Nine Academic Science Chemistry Unit Test Review
Name: _____________________________
Scientific method: Observe phenomenon, define problem, make & test hypothesis, draw a conclusion, repeat
Laboratory Equipment and Safety: 23 common lab items; Safety symbols and practices
Properties of Matter: Definition of matter, states of matter, physical properties
Mass, volume, density: Definitions and how to measure; Density formula and calculations
Physical changes: Condensation and vaporization, freezing and melting, sublimation
Chemical changes: 5 clues that a chemical change has occurred
The particle theory: The parts of the theory
Classification of matter: Pure substances (elements, compounds), mixtures (solutions, mechanical mixtures)
Chemical symbols: First letter capitalized, second letter (if present) is lower case
Chemical formulas: Groups of symbols and numbers; Structural formulas; Single and double bonds
Parts of the atom: Electrons surround nucleus (protons and neutrons); number of protons and electrons are given
by atomic number, number of neutrons = mass number – atomic number
Standard atomic notation: Mass number in top corner, atomic number in bottom corner (73Li)
Bohr Rutherford diagrams: Number of protons and neutrons in nucleus; Electron filling order of 2, 8, 8, etc.
Ions: Atoms that have gained or lost electrons; More electrons = negative ion, fewer electrons = positive ion
Isotopes: Atoms of an element with different numbers of neutrons (explains why atomic masses have decimals)
Periodic table: Groups: alkali metals, metalloids, halogens, noble gases.
Review Questions
These questions should act as a guide to help you study. However, it is not possible to condense 20 days onto one page. To get
the full picture you must use all of your notes. Also, being able to answer these questions using your notes does not guarantee
success. You won’t have your notes during the test. To be prepared you should be able to answer these questions from memory.
Look at your lab equipment handout. List 8 items that you have used in experiments in this class.
Cover your answers to the safety symbols. See how many you can recall.
What physical properties could be used to describe i) vegetable oil, ii) aluminum
Calculate the mass of a substance if its density is 2100 kg/m3 and its volume is 7.5 m3.
An empty beaker weighs 110 g. i) Filled to the 100 mL mark with liquid A, the new mass is 190 g.
What is the density of the liquid? ii) Liquid B has a density of 2.3 g/mL. What volume of liquid B
would be needed to equal the mass of 100 mL of liquid A? Are either of these liquids water? Explain.
6. Give 3 examples of physical changes. Give the terms used to describe changes of state.
7. There are a several clues that indicate that a chemical change is occurring. List these clues (use 3
words or less for each). For each clue give an example of a chemical change.
8. What’s the simplest unit of i) elements ii) compounds?
9. Identify each as a compound or element: Rb, RbCl, H2SO4, KF
10. What are the three subatomic particles? For each give mass, charge and location in the atom.
11. Draw the Bohr-Rutherford diagram for phosphorus. How would its stable ion be different?
12. Which groups did we identify on the periodic table? Describe the location, on the periodic table, of
each group. List one element from each group and indicate how it is useful in everyday life.