The rate at which a chemical reaction occurs cannot be changed. (true or false) if someone could me i would really appreciate it. : -)

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

In science class richard learns that a substance has a boiling point of 230 fahrenheit his teacher ask him to convert this temperature to degrees celsius what is the boiling point of his substance in degrees celsius