Chemical Formulas and Counting Atoms

A ___________________ uses chemical formulas, plus signs, and an arrow to represent a chemical reaction

• chemical formula

• chemical equation

• element symbol

• inventory

What is the correct "inventory" for KClO₃

• K = 1 Cl = 3 O = 3

• K = 3 Cl = 3 O = 3

• K = 1 Cl = 1 O = 3

• K = 1 C = 1 l = 1 O = 3

Tags

NGSS.MS-PS1-1

What does the arrow in a chemical equation represent?

• created

• makes

• yields

• destroys

Calculate the number of Oxygen atoms in Al(OH)₃

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

The ______ are numbers found on the lower right-hand side of an element symbol.

• Coefficient

• Exponent

• Multiplier

• Subscript

Coefficients in chemical formulas...

• Multiply just the first atom

• Add to the subscripts at the end of the molecule

• Multiply elements without subscripts

• Multiply EVERYTHING!

A ______ is a number written in front of a chemical formula.

• Coefficient

• Subscript

• Exponent

• Coordinator

How many O's are in Al₂(SO₄)₃

• 4

• 12

• 7

• 24

How many different elements are present in H₂COCH₂

• 5

• 4

• 3

• 2

Tags

NGSS.MS-PS1-1

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H₂O --> __NaOH + __H₂

• 2,2 --> 2,1

• 4,4 --> 4,1

• 1,2 --> 2,4

• 1,2 --> 2,1

Tags

NGSS.MS-PS1-5