BaCl2 (aq) + Na2CO3 (aq) BaCO3 (s) + NaCl (aq

Which coefficient should be placed in front of NaCl to balance this equation?

1

2

3

4

Are viruses living things?

Which of these is the best example of heat transfer by radiation?

What usually happens to the rate of reaction when the concentration of one of the reactants is increased

What elements make up the pain reliever acetaminophen, chemical formula C8H9O2N? Which element is present in the greatest proportion by number of particles?

8.69 grams NaCl * 1 mol NaCl / 58.5 grams calculate the moles

How can a neutral atom become a positively-charged particle?

The last column of the periodic table contains the noble gases, elements that do not easily form chemical bonds.

When pollution is removed from the air by a natural process, it

What atomic property is different in each isotope of an element?

How do carbon-12 and carbon-13 differ? Select all that apply. They have different amounts of neutrons. They have different atomic charges. They have different mass numbers. They have different amounts of electrons.