Chemical Reactions

In making a pizza, which process involves a chemical change?

• mixing spices for the sauce

• slicing pepperoni for the topping

• spreading cheese on the pizza

• baking the dough to form the crust

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Which of the following is an example of a physical change but not a chemical change?

• A log gives off heat and light as it burns.

• A tree stores energy from the Sun in its fruit

• A penny lost in the grass slowly changes color.

• A water pipe freezes and cracks on a cold night.

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NGSS.MS-PS1-4

Which of the following is a characteristic of all chemical changes?

• A different state of matter is produced.

• Some mass is converted to energy.

• Some form of light is given off.

• A new material is formed.

Examine the following chemical reaction:

H20 + CO2 → C6H12O6 + O2

What are the reactants?

• H20 + CO2

• C6H12O6 + O2

• →

• H20 + CO2→ C6H12O6 + O2

Tags

NGSS.MS-PS1-1

Examine the following chemical reaction:

H2O2 → H2O + O2

What are the products

• H2O2

• H2O + O2

• H2O2→H2O + O2

Tags

NGSS.MS-PS1-1

In which of the following examples has a chemical reaction occurred?

• After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.

• After turning on a blender filled with fruits, the fruit is chopped up and mixed together.

• After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.

• After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the Law of Conservation of Mass,

• matter is always created in a chemical reaction

• matter is always destroyed in a chemical reaction

• matter is created and then destroyed in a chemical reaction

• matter is not created or destroyed in a chemical reaction

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NGSS.MS-PS1-5

The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?

• 
• 
• 
• 

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NGSS.MS-PS1-5

What does corrosive mean?

• Able to be burned

• Able to be eaten

• Able to cause damage

• Able to go through a chemical reaction

During a chemical reaction, atoms ____________ to form new substances.

• Change

• Switch

• Turn into new atoms

• Rearrange

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NGSS.MS-PS1-2