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Science 9
Unit 2 Review
Write the difference between:
• heterogeneous mixture and a homogeneous mixture
• a physical change and a chemical change
• an element and a compound
Fill in the blanks
• If a substance has the ability to burn in oxygen, it has the property of ________.
• A homogeneous mixture can also be called a ______________.
• A heterogeneous mixture can also be called a _________________
• A substance that cannot be broken down into simpler substances is an _________.
• The physical property of matter know as mass per unit volume is called __________
WHMIS
• What does the acronym WHMIS stand for?
• Why was the WHMIS system developed?
Chemical Changes
• List three examples of chemical changes
• List three examples of physical changes.
Laws
• What is the law of conservation of mass?
• What is the law of definite composition?
Define the following
• atom
• proton
• neutron
• electron
• valence electron
• nucleus (atom)s
Draw and Label the Model of a Sodium Atom
Corrosive Chemicals
• Name three examples of highly corrosive chemicals.
• Name three highly reactive metals.
Periodic Table
• State the element symbol, atomic number, and atomic mass of the following:
• lithium
• beryllium
• phosphorous
• sulfur
Fill in the blanks
• The _________ table is a collection of elements.
• Vertical columns in this table are called __________.
• Horizontal rows in the table are called __________.
Periodic Table
• Which groups are divided by the “staircase” on the periodic table?
Periodic Table
• Identify the following elements as metals, non-metals, or metalloids.
• carbon (C)
• oxygen (O)
• iron (Fe)s
• silicon (Si)
• potassium (K)
• bromine (Br)
• boron (B)
• nitrogen (N)
Ionic and Molecular Compounds
• State whether each compound is ionic or molecular:
• hydrogen peroxide• carbon tetrachloride• aluminum oxide• nitrogen dioxide• lithium chloride• sodium fluoride
Chemical formula
• Use your textbook to write the chemical formula for the following molecular compounds:
• sulfur dioxide• carbon monoxide• carbon tetrachloride• propane gas• methane gas• carbon dioxide
Chemical Formula
• Name the following ionic compounds:
• NaCl
• KI
• AgBr
• MgO
• LiCl
• NaF
Chemical Reactions
• List six observations that would lead you to believe that a chemical reaction occurred.
Chemical equations
• Write the chemical equation for the formation of silver bromide (p. 148)
• Write the chemical equation for the combustion of methane gas (p. 149)
Chemical Equations
• Write a balanced chemical equation for the following reactions (pp. 148-149):
• hydrogen gas + oxygen gas -> water
• magnesium solid + oxygen gas -> magnesium oxide solid
Chemical Equations
• Write a balanced chemical equation for the following reactions (p. 149)
• methane gas + oxygen gas -> carbon dioxide gas + water vapour
Endothermic - Exothermic
• What is an endothermic reaction? Give an example of this type of reaction.
• What is an exothermic reaction? Give an example of this type of reaction.
Rate of Reaction
• Describe the effects of the following factors on the rate of a chemical reaction:
• concentration
• surface area
• temperature
Corrosion
• Write the chemical and the word equation for the corrosion of solid iron.
Galvanization
• Why are some metal products, such as nails, galvanized?
Combustion
• What are the beneficial effects of burning fossil fuels?
• What are the harmful effects of burning fossil fuels?s
Explain the differences
• reactant and product
• catalyst and inhibitor
• chemical reaction and rate of reaction