The energy required to start a reaction is called

ionization energy

kinetic energy

electronegative energy

activation energy

How does the Richter scale work? For 6th grade science

What does an egg need to hatch?

What are the periodic trends of ionic radii? Check all that apply. A. Ionic radii tend to increase down a group. B. Ionic radii tend to decrease across a period. C. Anionic radii tend to increase across a period. D.

Suppose you were doing an experiment outside on a sunny day. You find the temperature of some sand in 28 degrees. You also find the temperature of some water is 25 degrees. why would there be a difference between the temperature?

Calculate the ph of a solution formed by mixing 65 ml of 0.20 m nahco3 with 75 ml of 0.15 m na2co3.

Penny bought a club moss plant for her water garden. She needs to know how tall the plant will grow so she knows how much space it will need.

Which of the following is not a producer? Mushroom Tulip Grass Pine Tree

Phosphorus forms a number of oxohalides, x3po, in which x may be a f, cl, or br atom. the most common of these, phosphoryl chloride, is obtained as follows:

Which statement is true about the speed of light waves in a medium? a. Depends on the temperature of the light wave b. Decreases with a decrease in density of medium c. Decreases with an increase in density of medium d.

What's a certain indicator that a molecule is polar? the molecule has a nonpolar covalent bond and the dipole is cancelled due to symmetrical arrangement of atoms the molecule has a polar covalent bond and the dipole is cancelled due to symmetrical