How many moles of cl - ions are needed to completely combine with 0.25 moles of mg 2 ions?

2. Sediments are almost always deposited in flat layers. Does it appear that forces in the Earth affected the rock layers in this region? What clues do you have?

A student wants to increase the magnetic force between two bar magnets. What should the student do? A Make the positive poles face each other. B Move the magnets farther apart. C Make the negative poles face each other.

Which sample is a pure substance? A. a test tube of zinc oxide B. a container of zinc and oxygen C. a flask of pond water D. a jar of soil

In the equation HI + H2O → H30 * + I-, HI is a strong acid and I is a on Select one: O a. strong acid. O b. strong base. O C. weak acid. O d. weak base.

What are two lipids that store energy

1) Explain why oxygen is a fairly reactive element while neon is not. 2) Explain why beryllium loses electrons when forming ionic bonds, while sulfur gains electrons. 3) Explain why fluorine and chlorine have similar reactivities (Hint.

You add heat to matter, the atoms that make up the matter will begin to move?

What is the h2 h2o molar ratio?

Which of earth's systems was most affected by fossilized dinosaurs? A. Biosphere B. Hydrosphere C. Lithosphere D. Atmosphere

What factors are used to determine whether a bond will be polar or nonpolar? And what factors are used to determine whether a molecule will be polar or nonpolar?