S2 Chemical Reactions

Which of the following is an example of a CHEMICAL change?

• Shattering a window with a baseball

• Ripping paper into 1,000,000,000 tiny pieces

• Rusting an iron bar on a humid day

• Melting a block of copper metal

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a PHYSICAL change?

• Neutralizing vinegar with baking soda

• Breaking your laptop with a rock due to school stress

• Creating a precipitate by mixing Lead Nitrate and Sodium Iodide

• Burning popcorn in the microwave

Which of the following is NOT a chemical change?

• Iron Rusting
• Burning Paper
• Cutting Paper
• Baking a cake

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

Tags

NGSS.MS-PS1-2

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, if the reactants are heated, the reaction usually happens

• slower

• faster

• at the same rate

• in a smaller volume

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

You know that a chemical reaction has occurred if

• there is a precipitate (new solid)

• there is a color change.

• there is a temperature change.

• All of these answers are evidence.

Tags

NGSS.MS-PS1-2

Increasing the concentration of a reactant in a chemical reaction will _____________.

• decrease the rate of the reaction
• stop the reaction from happening
• increase the rate of the reaction
• have no effect on the rate of the reacion

Tags

NGSS.HS-PS1-5

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

Tags

NGSS.HS-PS1-5