Answer:
D alpha particles
Explanation:
Radioactive U-238 will decay into Thorium -232 by emitting alpha particles in the process of nuclear fission.
Nuclear fission is the radioactive decay process in which a heavy nucleus spontaneously disintegrates into two lighter ones and several other particles with a large release of energy.
U-238 → Th-232 + alpha particles + 2 neutrons + energy
This way the mass and atomic numbers are conserved;
To be able to determine the number of moles that a certain number of molecules comprises, we simply divide the number of molecules by the Avogadro's number which is equal to 6.022 x 10^23.
n = M/A
where n is the number of moles, M is the number of molecules, and A is Avogadro's number. Substituting the known values,
n = (4.15 x 10^23 molecules)/(6.022 x 10^23 molecules/mol)
Simplifying,
n = 0.689 moles
<em>Answer: 0.689 moles</em>
Answer: Collision theory explains why different reactions occur at different rates, and suggests ways to change the rate of a reaction. Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting. For collisions to be successful, reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation.
Molecules must collide before they can react
This rule is fundamental to any analysis of an ordinary reaction mechanism. It explains why termolecular processes are so uncommon. The kinetic theory of gases states that for every 1000 binary collisions, there will be only one event in which three molecules simultaneously come together. Four-way collisions are so improbable that this process has never been demonstrated in an elementary reaction.
Explanation:hope this helped
Easy!
All you have to do is look at the formula.
Lead Sulfide is PbS
Lead Oxide is PbO
Sulfur Dioxide is SO₂
Oxygen is O₂
You would need to balance out the equation, so it would be PbS + O₂ --> PbO + SO₂.
We can balance this out with the following. 2PbS + 2O₂ --> 2PbO + SO₂.
So 0.500 moles of oxygen would be the same conversion rate for PbO so it would also be 0.500 moles of lead oxide (PbO)
It’s is a pure substance because nothing is mixed with it and a molecule gas because it’s is a gas and it’s by its self