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Concept Check
Chemical Formulas and Compounds
Definitions and Representation
Chemical Reactions
Writing & Balancing Chemical Equations
100
What is a chemical reaction?
A change in matter that produces new substances with new properties.
100
Name the following compound: LiF. Why is it an ionic compound?
Lithium Fluoride It is an ionic compound because the first part of the name is a metal ion whereas the second part of the name is a non-metal ion.
100
Name the following compound: CO. Why is it a molecular compound?
Carbon monoxide. It is a molecular compound because both parts of the name are non-metals.
100
What are two ways to tell that a chemical reaction has occurred?
1) change in energy 2) change in colour (products is different colour from reactants) 3) gas is formed (bubbles, odour) 4) precipitate is formed (solid subtance when two clear solutions are mixed)
100

Name the alkaline earth metals.

Beryllium, Magnesium, Calcium, Strontinum, Barium, Radium

200
What is the term used for substances that react together in a chemical reaction?
Reactants
200

What is the common name for dihydrogen monoxide?

Water

200

What is an ion?

A particle carrying a positive or negative charge due an atom loosing or gaining one or more electrons.
200
Predict whether a chemical reaction has occurred for the following process: Frying chicken. If yes, state the evidence.
Yes. Evidence: odour
200

Write the following word equation as a chemical formula: sodium chloride ----> sodium + chlorine

NaCl ----> Na + Cl(2)

300
Identify the information listed for the element beryllium: a) symbol b) atomic number c) number of protons d) number of electrons
a) Be b) 4 c) 4 d) 4
300

Molecular compounds are made up of this kind of bond.

Covalent

300
According to Lewis notation: how many dots should Fluoride have?

Seven

300

Name given to chemical reactions that absorb energy.

Endothermic

300
Balance the following equation: ___ K + ___ Br(2) ----> ___ KBr
2 K + Br(2) ----> 2 KBr
400
What is WHMIS and what does it stand for?
WHMIS (Workplace Hazardous Materials Information System) provides information about how to store, handle and dispose of chemical substances.
400

Name the following compound: NaBr

Sodium bromide

400

Number of electron shells for Potassium.

Four
400
What type of chemical reaction is this? Water ----> hydrogen + oxygen
Decomposition reaction
400
Balance the following chemical equation: ___ S + ___ O(2) ----> ___ SO(3)
2 S + 3O(2) ----> 2 SO(3)
500

Identify the elements that make up the compound KCl. How many atoms of each element are there?

Elements: Potassium (K) and Chlorine (Cl). There is  one atom of each.

500

Write the chemical formula of table salt.

NaCl

500

Name the following compound: NO. Is this a ionic compound?

Nitrogen monoxide. No, it is not an ionic compound because both nitrogen (N) and oxygen (O) are non-metals.

500

How can you turn NaCl ----> Na + Cl (a decomposition reaction) into a synthesis reaction?

Flip it. Na + Cl ----> NaCl

500
Balance the following chemical equation: ___ As + ___ O(2) ----> ___ As(2)O(5) What type of reaction is this?
4 As + 5 O(2) ----> 2 As(2)O(5) This is a synthesis reaction.