How does the valence of element release tout chemical activity?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.