What condition must occur when a chemical reaction is at equilibrium? select one:
-the products and reactants are present in equal concentrations.
-the forward and reverse reactions are happening at equal rates.
-neither condition must occur when a chemical reaction is at equilibrium.
-both conditions must occur when a chemical reaction is at equilibrium.

Helium decays to form lithium. which equation correctly describes this decay?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt

What is the mass in grams of 12.26 ml of acetone