If the farmer plants the same crop in a field year after year the soil becomes less fertile what causes this decrease in fertility

An electron is on a - 2.5 eV energy level. the electron is stuck by a 2.5 eV photon. What will most likely happen?

What do all four of these molecules have in common? A. They are essential to life. B. They carry signals. C. They are water soluble. D. They act as a source of energy

A brick measures 25 cm by 12 cm by 13 cm. What is the volume of brick in cm cubic? How many milliliters of water would this brick displace?

The metalloids that are included in group 15 are antimony and what elements? 1. N 2. P 3. As 4. Bi

An electric kettle uses electrical energy to boil water. Energy from the electricity is transferred to the water, heating it up. An electric ice maker also uses electrical energy, but it freezes water to form ice.

How many bromine atoms are present in 39.9 g of CH2Br2

Chemists use activity series to determine whether which type of reaction will occur?

1. Does the temperature rise or drop when you mix vinegar and baking soda. 2. Does the temperature rise or fall when you mix baking soda and water.

Use the balanced equation from number four above to determine the limiting reactant if we had a mixture of 5.0 moles of Fe and 4.0 moles of O2.

Using the kinetic theory what happens to oxygen particles as they are cooled