450 J of energy is required to raise the temperature of a block of aluminum from 20 °C to 60 °C. Calculate the mass of aluminum present. Specific Heat (J/g•°C) of aluminum is 0.90.

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates

How many atoms or molecules are there in a mole of a substance?