Elements, compounds, chemical reactions review

Is wood burning a physical or chemical change?

• Physical 
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Is milk going sour a physical or chemical change?

• Physical 
• Chemical

Tags

NGSS.MS-PS1-2

Is Gatorade powder dissolving in water physical or chemical change?

• Physical 
• Chemical

Tags

NGSS.MS-PS1-2

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?

• a change of color
• a change of state
• a temperature decrease
• a temperature increase

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is a chemical change rather than a physical change 

• boiling water at 100 C
• chopping up a piece of wood. 
• cooking a cake 
• ice carbon dioxide sublimating to gas 

Tags

NGSS.MS-PS1-2

The Best Friend's Club uses "invisible ink" to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper but turns brown when a club member holds a burning candle under the paper. Once it is heated, it is never invisible again.

What type of change is occurring when the paper is heated?

• chemical change
  

• elemental change
• physical change
• temperature change

Tags

NGSS.MS-PS1-5

Which is an example of a physical property?

• ability to tarnish

• ability to burn

• shape

• ability to rust

Reactants

• A starting material in a chemical reaction

• the material you have at the end of the experiment

• a substance that forms in a chemical reaction

products

• a substance that is formed or produced in a chemical reaction

• A starting material in a chemical reaction. It's what goes into the equation or experiment

• A change in matter that produces one or more new substances

Chemical Change

• A change in matter that will NOT produce any new substances

• A change in matter that produces one or more new substances

• Cutting paper