The pitch of the siren of a moving fire truck changes from high to low as the fire truck passesby. What property of sound wave changes as the fire truck goes by?

How many independent variables can you have in an experiment for it to be valid?

In chemistry what is a physical property is reversible

SO3 is an empirical formula for which of the following?

What is 0.0135 moles of in AlCl3 grams? Round to 3 sig figs

Which has more heat energy, an iceburg or a cup of boiling water. explain

When bases dissolve in water they release what type of negative ion?

An acid is added to water, and a new equilibrium is established. What is the system after the acid is added?

The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm? A. 7.7 degrees B. 16.6 degrees C. 6.

g write net ionic equations for the reactions of h2po4 - an amphiprotic ion with aqueous solutions of hcl koh

Eagles use sharp talons to grab fish from the water. What characteristic of life is this most directly an example of?