How many experiment are necessary to invalidate a scientific hypothesis

In three different experiments, the following results were obtained for the reaction A - > products: [A]o = 1.00M, t1/2=50 min; [A]o = 2.00M, t1/2 = 25 min; [A]o = 0.50M, t1/2 = 100 min.

What must be true for a substance to be able to dissolve in water? The solute particles must have a strong attraction for the water particles. The solute must be able to react with water at the given temperature.

Billions of years ago, Earth was a very hot place due to

In a motion diagram the size of the object must be less than the distance moved t or f

Boyle's law relates the volume and pressure of an ideal gas at two different conditions as V1P1 = V2P2. If the volume of an ideal gas is 2 L at 3 atm, what volume is it at 4 atm?

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium

How many molecules are in 4.50 moles of H2O? A. 450 molecules B. 6.02 x 1023 molecules C. 2.71 x 1024 molecules D. 3.00 molecules

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride

If the mass of a material is 111 grams and the volume of the material is 11 cm3, what would the density of the material be?