What is the wavelength (in nm) of light having a frequency of 7.8 * 1013 Hz? What is the frequency (in Hz) of light having a wavelength of 5.54 * 102 nm?

Which actions would increase the rate at salt dissolves in water □ stir the water □ crush the salt □ use less water □ heat the water □cool the salt

1. If a person's mass is 56 kg, what is this weight in pounds? 56kg

Which change would result in a stronger electromagnet?

What is the concentration of Sr2 + in a saturated solution of SrSO4? SrSO4 has a Ksp of 3.2 x 10-7. 2.9 x 10-7 M 5.7 x 10-4 M 3.2 x 10-7 M 1.0 x 10-13 M

A student performs a dehydration experiment and starts with 6.79 grams of hydrate. After heating the hydrate and allowing it to cool, the student weighs the anhydrous salt. The mass of the resulting anhydrous salt is 3.17 grams.

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.

Which is an example of Temporal Isolation? A. Flowers that bloom in different months. B. Birds that have different mating calls C. Fruits flies that mate in different locations. D. Squirrels that have different fur colors

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low / Explain your answer

20 Which statement describes a reversible reaction at equilibrium? (1) The activation energy of the forward reaction must equal the activation energy of the reverse reaction.

Count the total number of atoms in CaCO3: 2 3 4 5 6