Which of the following element is the smallest?

A. Strontium (Sr)

B. Magnesium (Mg)

C. Beryllium (Be)

D. Calcium (Ca)

The convection of gases occurs in which region of the Sun?

How is precipitation useful in our daily lives?

What happens when a catalyst is used in a chemical reaction?

Consider the reaction between hcl and o2: 4hcl (g) + o2 (g) →2h2o (l) + 2cl2 (g) when 63.1 g of hcl are allowed to react with 17.2 g of o2, 59.6 g of cl2 are collected.

How many moles of malachite should be formed when 1.5 moles of copper sulphate reacts with an excess of sodium carbonate?

How much greater is the energy produced by a fusion reaction compared to a chemical reaction?

True or false. A bond between a metal atom and a nonmetal atom is likely an iconic bond

What is a precipitate? It is a liquid that forms from solution during a chemical reaction. It is a reactant that forms from solution during a chemical reaction. It is a solid that forms from solution during a chemical reaction.

The electron configuration for an atom is 1s22s22p2. How many electrons does the atom have? 4 2 6 5

When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3) b.