Chemical Changes and Chemical Formulas

Total mass before a chemical reaction is the same as the mass after the chemical reaction is

• law of conservation of mass
• reactant
• product
• yield

Tags

NGSS.MS-PS1-5

a chemical substance present at the start of a chemical reaction

• product
• reactant
• yield
• chemical formula

Tags

NGSS.MS-PS1-5

unexpected color-change is a sign of a

• physical change
• reactant
• chemical change
• yield

Tags

NGSS.MS-PS1-2

example of physical change

• mixing paint together
• making pancakes
• breaking glow sticks
• fireworks

FeNa is a

• yield
• compound
• chemical change
• law of conservation of mass

Tags

NGSS.MS-PS1-1

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

Fe₂O₃ has

• 2 Iron atoms, 3 oxygen atoms
• 6 iron atoms, 6 oxygen atoms
• 3 iron atoms, 2 oxygen atoms
• 1 iron atom, 6 oxygen atoms

Tags

NGSS.MS-PS1-1

6CO₂ + 6H₂O contains how many elements

• 4
• 36
• 3
• 2

Tags

NGSS.MS-PS1-1

Example of physical change

• putting an object in a box
• rusting cans
• lighting a match
• putting acid on copper

evidence of a chemical reaction

• boiling water
• folded clothes
• gas is released
• tearing paper

Tags

NGSS.MS-PS1-2