Option 1/A (It is the first one)
Answer:
2
Explanation:
Pb(NO3)2 + 2NaI 2NaNO3 + PbI2
The third one
synthesis reactions have multiple reactants that synthesize into one product
Answer:
hot air rises because gases expand as they heat up.When air heats up and expands,its density also increases.The warmer,less dense air effectively floats on top of the colder, dense air below it. This creates a buoyant force that causes warmer air to rise.
cold air sinks because it is heavier as its more dense ( because of closely packed molecules) soits harder for them to move and they absorb less energy. Also, gravity pulls on it more strongly.
Hope it helps :)
Answer:
1 I'm doing this in science class right now I got help yesturday on it! hope this helps
