What are the most common elements in the earths atmosphere

Why do convection currents form

A change in color, such as rusting of metal, is a sign that ... A.) A chemcal change is taking place. B.) A physical change has just taken place. C.) Oxygen is present D.) Organic chemicals are present

What are the repulsive forces

Which is more dense a pound of rice or a pond of cement

Sodium is a member of the alkali metals, and it tends to form ionic compounds with many different nonmetals. A neutral sodium atom contains 11 protons and 11 electrons. What occurs in order for a sodium atom to turn into a sodium ion?

Select the type of energy involved in each step. You turn on the burner of a gas stove. a) chemical b) thermal c) mechanical d) electrical The gas ignites. a) chemical b) thermal c) mechanical d) electrical The gas warms the water in the pan.

What volume of 0.500 M AgNO3 are needed to react with 100. mL of 0.400 M K2CrO4? 2 AgNO3 (aq) + K2CrO4 (aq) ➔ Ag2CrO4 (s) + 2 KNO3 (aq)

Why can gases and liquids both transmit heat by convection? a. Their particles are free to move away from each other b. They both have a fixed volume c. They both contain charged particles d. Their particles both vibrate around fixed positions

How many atoms of oxygen, O, are in 0.0595 moles of water?

Calcium chloride contains calcium and chloride ions. write the ground-state electron configuration for the chlorine ion.