MCSHS Y8 Chemistry Revision

Which of the following is NOT an example of a chemical reaction?

• Wood Burning
• A cake baking in an oven
• Melting Ice Cream
• Mixing Vinegar and Baking Soda

Tags

NGSS.MS-PS1-2

Is burning a campfire a chemical or physical change?

• Chemical
• Physical 

Tags

NGSS.MS-PS1-2

WHY is burning a campfire a chemical change? 

• It created a new substance with new properties
• It changes in size 
• There is a lot of smoke
• The logs get smaller 

Tags

NGSS.MS-PS1-2

This is an accurate model because...

• It is missing one more CO₂ in the model. 
• Only the reactant side has the correct models for the formulas of each molecule. 
• It has the correct number of molecules and atoms for both sides of the equation. 
• None of the above 

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

In this model, the reactants are...

• 2H₂O
• H₂O₂
• 2H₂
• O₂

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In this model, the PRODUCTS are 

• 2KI and 2KNO₃
• 2KI and Pb(NO₃)₂
• PbI₂ and 2KI
• PbI₂ and 2KNO₃

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The atomic number tells you what?

• number of electrons
• number of protons
• number of neutrons
• both electrons and protons in an atom.

Elements which are shiny, conduct electricity and heat are called

• metal
• nonmetal
• metalloid
• nonexistent

Tags

NGSS.HS-PS1-1

Which element is not a metal?

• H
• Re
• Al
• B

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

Tags

NGSS.HS-PS1-1