Lea has just ordered a box of "universal" litmus paper. She dips one piece into vial A, and it turns green. She dips another piece into vial B, and it turns red.

Which vial, A or B, contains a greater concentration of H + ions?

A small metal bar, whose initial temperature was 30° C, is dropped into a large container of boiling water.

Name two metals that can be scratched from bauxite Leone

A 5 kg block accelerates across a horizontal surface at 7 m/s^2 when you exert a 60 N force on it. What is the force of friction on the block (Ffs/b) ? If you don't mind finding the kinetic friction coefficient too?

Planetary nebulae are characterized by an emission spectrum consisting of Balmer (hydrogen) emission lines and a pair of strong emission lines at 4959˚A and 5007˚A that were quite mysterious when first seen.

Compare the properties of Titan's atmosphere with those of Earth's atmosphere.

What happens to water vapor as it rises in the atmosphere? A. Heats and condenses B. Heats and expands C. Cools and condenses D. Cools and expands

Which would likely demagnetize a magnetized iron nail?

To create "dry ice," manufacturers compress and cool carbon dioxide gas until it solidifies. Describe what happens to the carbon dioxide molecules as the gas is compressed and cooled.

A pulse of red light and a pulse of blue light enter a glass block normal to its surface at the same time. after passing through the block, which pulse exits first?

An object is hanging by a string from the ceiling of an elevator. the elevator is moving upward with a constant speed. what is the magnitude of the tension in the string? an object is hanging by a string from the ceiling of an elevator.