WorksheetsClassification of Reactions and Decay Problems
Total questions: 14
Worksheet time: 11mins
Combustion reactions are when things burn. Which of the following would be a combustion reaction
popcorn + heat + CO2 --> oxygen + water
popcorn + heat + oxygen --> carbon dioxide + water
Popcorn + oxygen --> heat + carbon dioxide
popcorn + CO2 + O2 --> heat + sugar
If you have 40 grams of a radioactive substance how much would be available after two half lives (don't over think it)
If a reaction is exothermic what is happening to the heat?
It is going to be used up
It is going to be neutralized
It is going to be released
It is going to be absorbed
What statement is true about the product?
It was created via decomposition
it is a covalent compound
it is a gas
It is a new substance
If the products have MORE energy this reaction AND heat was required to make it happen. This reaction would best be described as?
Exothermic and non-spontaneous
Endothermic and spontaneous
Exothermic and spontaneous
Endothermic and non-spontaneous
When you have a single element + a compound and you make a new single element plus a compound. (A + BC --> AC + B) this is a
Double replacement
Synthesis/Combination
Decomposition
Single replacement
What type of reaction would this be?
AB + CD --> AC + BD
Single replacement
Double replacement
Decomposition
Synthesis
This term refers to the amount of time it takes for half of a certain substance to undergo radioactive decay.
alpha life
beta life
radioactivity time
half-life
How many neutrons are in this isotope of Nitrogen-15?
15
7
22
8
If the half-life of a radioactive substance is 4 days, how much of a 200-g radioactive sample is left after 16 days?
800g
50g
25g
12.5g
How many grams of Carbon-14 will remain after 17,100 years?
32 g
16 g
8 g
4 g
What is the difference between exothermic reactions and endothermic reactions?
Endothermic reactions take in energy and Exothermic reactions give off
Endothermic reactions are always spontaneous
Exothermic reactions are always non-spontaneous
Endothermic reactions give off energy and exothermic reactions take in energy
If a precipitate is formed then the reaction was likely a
Single replacement
Double replacement
Combustion
Synthesis
What is the coefficient (number in front of the compound) for CO2 when balanced?
1
2
3
4
