Calcium is an element. What is the smallest particle of calcium that has the same chemical properties of calcium? A. an atom of calcium
B. a proton from a calcium atom
C. an electron from a calcium atom
D. a molecule that contains calcium

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?