Copper Chemistry and Ionic Compounds

The video tutorial explains how to write the formula for copper(I) sulfate. It begins by identifying copper and sulfate, noting that sulfate is a polyatomic ion with a 2- charge. The tutorial discusses the ionic nature of the compound and the need for charge balance. Using the crisscross method, the charges are balanced to form the correct formula, Cu2SO4. The tutorial concludes by verifying the formula and ensuring the charges add up to zero.

What is the chemical symbol for copper?

• Co

• Ca

• C

• Cu

Which of the following is a polyatomic ion?

• Na

• SO4

• Cl

• O2

What is the charge of the sulfate ion?

• 1-

• 2-

• 1+

• 2+

Why must the charges in an ionic compound add up to zero?

• To form a neutral compound

• To balance the equation

• To make it soluble

• To ensure stability

What does the Roman numeral in Copper(I) indicate?

• The atomic mass of copper

• The number of sulfate ions

• The charge of the copper ion

• The number of copper atoms

What method is used to balance the charges in Copper(I) Sulfate?

• Cross-multiplication

• Crisscross method

• Substitution method

• Balancing method

In the crisscross method, what happens to the charges?

• They are swapped as subscripts

• They are ignored

• They are added together

• They are subtracted

How many copper ions are needed to balance one sulfate ion in Copper(I) Sulfate?

• Two

• Three

• Four

• One

What is the final formula for Copper(I) Sulfate?

• CuSO3

• Cu2(SO4)3

• Cu2SO4

• CuSO4

What is the net charge of a correctly balanced ionic compound?

• Zero

• Negative

• Positive

• Variable