Which of these represents a chemical change?

A) two compounds combining to form a mixture

B) a mixture being separated into two elements

C) a compound being separated into two elements

D) an element changing state from solid to liquid

Pbco3 and ki are used in this preparation. Which one is the limiting reagent

You have 4.3 moles of fe2o3. how many grams is that?

How to determine endothermic and exothermic reaction using delta h?

When a wave moves, what happens to the medium? A it moves forward with the wave B it moves only perpendicular to the energy of the wave C it moves up and down or back and forth, but it does not move forward with the wave D it moves only parallel to

Which electron configuration represents an excited state for a potassium atom? (1) 2-8-7-1 (3) 2-8-8-1 (2) 2-8-7-2 (4) 2-8-8-2

If the average American throws away 4.5 lb of trash each day, and the population of the US is estimated to be 311 million people, calculated the number of metric tons of garbage thrown away in the US each year.

Difference between radical and compound

Water is a produced when 30.0 grams of hydrogen reacts with 80.0 grams of oxygen what is the limiting reagent

How are reactions and products related in a chemical reaction?

Ollie wants to sign up with an online social network called TeensMeet, which other kids at school have joined.