Semester 1 Review

Front

What do coefficients in chemical formulas do?

Back

Coefficients multiply EVERYTHING in the chemical formula.

Front

What is the composition of C₃H₅(NO₃)₃?

Back

C = 3, H = 5, N = 3, O = 9

Front

How many elements are in the chemical formula NaHCO₃?

Back

There are 4 elements: Na, H, C, O.

Front

What type of change occurs when a substance transforms into a different substance?

Back

This is a Chemical Change.

Front

How many total POTASSIUM atoms are in the formula K₂SO₄?

Back

There are 2 potassium atoms.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the enclosed atoms are grouped together and the coefficient outside applies to all atoms inside.

Front

How do you determine the total number of atoms in a chemical formula?

Back

Add the number of atoms of each element, considering coefficients and subscripts.