Which of the following equations has correct formulas and also is a balanced equation?

a. CaCO3 - > CaO + CO3

b. 3KCl + HNO3 - > 3HCl + KNO3

c. 2Be + O2 - > 2BeO

d. Mg + O2 - > MgO2

Why does pumice float

How many neutrons are in an atom of tin? Round your answer to the nearest whole number.

Isotonic saline solution, which has the same osmotic pressure as blood, can be prepared by dissolving 0.923 g of nacl in enough water to produce 100. ml of solution. what is the osmotic pressure of this solution at 25 ∘c

Solid, liquids and gases are three forms of matter that?

Determine the concentration of a solution made by dissolving 44.0 g of calcium chloride (CaCl2) in 0.30 L of solution. SHOW YOUR WORK for credit. Partial credit is awarded! Correct answers with no work will not receive credit.

Model describe how you would show j. j. thomson's model of the atom using small beads and clay

Switching one substance for another is called ... ? a) displacement b) synthesis c) decomposition d) oxidation

C2h4 + O2 - CO2 + H2O If we start with 20 grams of CH4, how many moles of CO2 will form?

How does chemical energy relate to the atom and how can we use it?

A positively charged atom is known as a cation. A cation will? ... A) have more protons B) have to same number of protons and electrons. C) Be the same as a neutral atom. D) have more electrons.