Flashback - Changes, Molecules, Reactions

Which of the following would be an example of a chemical change?

• Chopping up a log with an ax

• Dissolving sugar in water

• Burning a piece of paper

• Melting an ice cube

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Phase Changes are examples of

• Chemical Changes

• Physical Changes

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

All of the following are clues for a chemical change except

• change in temperature

• change in phase

• color change

• odor

Tags

NGSS.MS-PS1-2

Which of the following would be an example of a physical change?

• condensation forming on a mirror while showering

• an old iron gate rusting

• baking a cake

• frying an egg

What do the colored circles in this model represent

• chemical bonds

• compounds

• electrons

• atoms

Tags

NGSS.MS-PS1-1

What do the gray "sticks" in this model represent?

• compounds

• chemical bonds

• protons

• atoms

Tags

NGSS.HS-PS1-4

What is the chemical formula for this compound?

• C₆H₁₂O₆

• H₂O

• C₂H₆O

• NH₃

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How many molecules exist if the following chemical formula is used: 5H₂SO₄

• two

• four

• five

• seven

How many total atoms exist in the following chemical formula: 2H₂O₂

• two

• four

• eight

• twelve

Tags

NGSS.MS-PS1-1

How many oxygen atoms exist in the following chemical formula: 6CO₂

• two

• four

• eight

• twelve

Tags

NGSS.MS-PS1-1