Chemical Formulas and Atom Counting

The video tutorial covers the basics of balancing chemical equations, focusing on counting atoms in compounds. It introduces key concepts such as subscripts, coefficients, and the use of parentheses in chemical formulas. The tutorial provides examples and practice problems to help students understand the distributive property and multiplication in chemical equations.

What does a subscript in a chemical formula indicate?

• The type of chemical bond

• The number of atoms of the element

• The charge of the compound

• The number of molecules

How does a coefficient affect a chemical equation?

• It affects the charge of the compound

• It alters the chemical properties

• It changes the type of elements present

• It indicates the number of molecules

What is the effect of parentheses in a chemical formula?

• They indicate a chemical reaction

• They change the state of matter

• They show the charge of the compound

• They group atoms to be multiplied by a subscript

In the formula Ca3(PO4)2, how many phosphorus atoms are present?

• 6

• 3

• 1

• 2

How many oxygen atoms are in the compound Al2(SO4)3?

• 16

• 12

• 8

• 4

What is the total number of atoms in one molecule of Pb(NO3)2?

• 10

• 12

• 11

• 9

If a compound has a coefficient of 3, how many times should you count the atoms in the formula?

• Three times

• Once

• Four times

• Twice

In the compound 2Pb(NO3)2, how many nitrogen atoms are there in total?

• 8

• 6

• 10

• 4

What is the total number of oxygen atoms in 2Pb(NO3)2?

• 24

• 18

• 30

• 12

How many lead atoms are present in 2Pb(NO3)2?

• 4

• 1

• 3

• 2