potassium iodide solution, lead(ll) nitrate solution
what were your observations ? {there are two of them}

a) change in color
b) formation of a gas
c) formation of a solid
od) change in energy

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

8. what happens to matter during a chemical reaction