A rock from the moon contains 12.5 percent of the potassium-40 it began with. how old is the rock

What kind of shampoo should be used on hair that has been chemically straightned? 1. Clairifying 2. Acid Balancing 3. Medicated 4. Dry Shampoo

Which kind of force explains earth's motion

Suppose that when crops developed a fungal infection, a farmer decided to spray the soil with a fungicide. Just after spraying, the plants looked healthier, but soon showed signs of mineral deficiency. What might explain this response?

The empirical formula for a compound is c2h5 and its formula mass is 58 amu. what is its molecular formula?

38 When a sample of a gas is heated in a sealed, rigid container from 200. K to 400. K, the pressure exerted by the gas is (1) decreased by a factor of 2. (2) increased by a factor of 2. (3) decreased by a factor of 200.

A) If you weigh a hydrated compound before and after heating it. Do you expect the mass to be more or less than before heating? Explain why. b) How about if you weigh a bag of popcorn before and after heating it.

Define the term relative molecular mass

It took many of the metals several minutes to begin to react. Once the reaction was initiated, several of these metals continued to react quite vigorously.

What dose the smooth ER do

How many valence electrons are in each atom?