Chemical Formulas and Reactions

How many carbon atoms (C) are in a CO₂ molecule?

How many Oxygen atoms (O) are in a  molecule  of CO₂

• 1
• 2
• 3
• 0

Tags

NGSS.MS-PS1-1

How many Hydrogen atoms (H) are in a molecule of H₂O?

CH₂Cu₈ - How many Copper atoms are in this formula?

• 1

• 2

• 8

• 16

Tags

NGSS.MS-PS1-1

How many total atoms are in this formula? 3Zn₂O₃H

• 6

• 9

• 18

Tags

NGSS.MS-PS1-1

unexpected color-change is a sign of a

• physical change
• reactant
• chemical change
• yield

Tags

NGSS.MS-PS1-2

6CO₂ contains

• 6 carbon atoms, 2 oxygen atoms
• 12 carbon atoms, 12 oxygen atoms
• 6 carbon atoms, 12 oxygen atoms
• 12 carbon atoms, 6 oxygen atoms

Tags

NGSS.MS-PS1-1

6CO₂ + 6H₂O contains how many elements?

• 4

• 36

• 3

• 2

Example of physical change

• ice melting

• rusting cans

• lighting a match

• putting acid on copper

a chemical equation is balanced when

• the number of elements are equal
• the mass of the reactants is equal to the mass of the products
• the reactants are more than the products
• the products have the most mass

Tags

NGSS.MS-PS1-5