Which of these is an example of a physical change?

1. melting a substance

2. breaking chemical bonds

3. forming chemical bonds

2. nuclear decay

The solubility product constant of pbcl2 is 1.7 * 10-5. what is the maximum concentration of pb2 + that can be in ocean water that contains 0.0500 m nacl?

A swimming pool, 10.0 m by 4.0 m is filled to a depth of 3.0 m with water at a temperature of 20.0 degrees Celsius. How much energy is required to raise the temperature of the water to 30.0 degrees Celsius.

Which indicates that the clump of waxy fluid at the center of the lamp is moving downward rather than upward? it is less dense than the surrounding liquid. its molecules are losing kinetic energy.

1) These are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Which of the following would most likely make up a team of scientists?

What are the coefficients that will balance this skeleton equation? a l c l 3 + naoh → al (oh) 3 + nacl?

Which cluster in the agriculture industry would be most likely to partner with the animal systems cluster to introduce new modern procedures to animal careers

Sarah is ordering cheese pizza for a party of ten people she knows each pizza has 8 slices to figure out how many pizzas to order sarah needs to know the

How many grams of sodium ions are in na2so4?

Electron configuration for iron?