Nuclear Reactions
What is the nucleus?
After two half-lives, what percentage of a radioactive sample remains?
In this type of reaction, a reactant reacts with oxygen gas to produce carbon dioxide and water vapor.
What is combustion?
Here is the balanced equation for the oxidation of magnesium:
2Mg + 1 O2 --> 2 MgO
How many oxygen atoms are on the left side? How many on the right side?
2 oxygen atoms on both sides.
This is the term for a charged particle.
What is an ion?
This is the term for when an isotope spontaneously emits energy and mass becoming another element.
What is transmutation? (will also accept decay)
A radioactive sample with a mass of 64 g undergoes 3 half-lives. How many grams remain?
8 g
What kind of reaction is represented by this symbolic representation:
A + B --> AB
What is synthesis?
Write a balanced equation for:
___ P4 + ___ Br2 --> PBr3
1 P4 + 6 Br2 --> 4 PBr3
This is the reaction for making soap.
What is saponification?
This particle has the same mass and charge as a Helium nucleus. It cannot travel very far and is blocked by skin or a sheet of paper.
What is an alpha particle?
How many half-life periods will it take for 50 g of 99Tc to decay to 6.25 g?
Note: 99Tc has a half-life of 2.13 x 105 years and undergoes beta decay.
Three half-lives
Identify the reaction type:
AgNO3 + NaCl --> AgCl + NaNO3
Double replacement
Write a balanced equation for:
C3H8 + O2 --> CO2 + H2O
C3H8 + 5O2 --> 3CO2 + 4H2O
What is an exothermic process?
23892U --> 42He + X
What is 23490Th
How long will it take 30 g of 37K to decay to 7.5 g?
Note: 37K has a half-life of 1.23 s and undergoes positron emission.
Two half-lives = 2.46 s
Identify the type of reaction:
2H2O2 --> 2H2O + O2
Decomposition
Write a balanced equation for:
CoBr3 + CaSO4 --> CaBr2 + Co2(SO4)3
2CoBr3 + 3CaSO4 --> 3CaBr2 + Co2(SO4)3
This is the term for how strongly an atom attracts electrons in a bond.
Carbon-14 undergoes beta decay. Write a nuclear reaction for the beta decay of a radioactive carbon-14 isotope.
146C --> 147N + 0-1e
After 8.4 x 1010 years, how many grams will be left from a 256 sample of Th-232?
Note: Th-232 has a half life of 1.40 x 1010 years and undergoes alpha decay.
4 g
In the lab, we combined solid aluminum foil and reacted it with a blue-green solution of copper chloride (CuCl2). We saw the formation of solid copper and a dark green solution of aluminum chloride (AlCl3). Write the equation for this reaction. What kind of reaction is this?
2Al + 3CuCl2 --> 3Cu + 2AlCl3
Single replacement
Write a balanced equation for:
H2SO4 + B(OH)3 --> B2(SO4)3 + H2O
3H2SO4 + 2B(OH)3 --> B2(SO4)3 + 6H2O
This group of nonmetals is extremely reactive and exists as diatomic molecules.
What are the halogens?