PS03A Pre Quiz - Chemical Reactions

This happens when atoms break free of chemical bonds and recombine to form new substances.
1. endothermic reactions
2. color shifts
3. chemical reactions
4. exothermic reactions
These typically have one, two or three letters with the first one capitalized.
1. chemical thermics
2. chemical symbols
3. chemical drawings
4. chemical colors
Chemical reactions can be ___________ by counting the numbers of atoms on the reactant side and the product side of a balanced equation.
1. colored
2. predicted
3. estimated
4. divided
This happens when chemicals break their bonds and recombine to form new compounds.
1. reaction
2. replacement
3. fixture
4. exothermic
Which is NOT a way to show a chemical reaction?
1. picture or drawing
2. chemical shorthand of symbol
3. color or taste
4. word equation
Matter can neither be created nor destroyed. This is the law of _________ of mass.
1. destruction
2. conservation
3. distortion
4. changing
The number of atoms in the reactants is __________ the number of atoms in the products.
1. half
2. equal
3. twice
4. 3.982 times
A subscript tell how many electrons are in a molecule.
1. true
2. false
A coefficient tells how many molecules are in a reaction.
1. true
2. false
Exothermic means that the reaction gives off heat.
1. true
2. false
Endothermic means that the reaction gives off heat.
1. true
2. false
Endothermic means that the reaction absorbs heat.
1. true
2. false
Hydrogen and oxygen combine to form water.
1. true
2. false
in a chemical reaction, the ____________ of atoms remains the same.
1. polarity
2. color
3. exothermic
4. number
The terms exo and endo describe the heat of a reaction.
1. true
2. false

PS03A Pre Quiz - Chemical Reactions

This will help you know where you are strong.