Chemical reactions 7Y1

1. How is a chemical change different from a physical change?

• there is no difference

• a physical change creates a new substance

• a chemical change creates a new substance

The process by which one or more substances change to produce one or more different substances

• Chemical Process

• Reactant

• Chemical Reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A substance produced during a chemical reaction

• Product

• Reactant

• Properties

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A substance that takes part in and undergoes change during a reaction

• Product

• Molecule

• Reactant

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In any chemical reaction, the mass of the products is always:

• slightly less than the mass of the reactants
• much less than the mass of the reactants
• the same as the mass of the reactants
• greater than the mass of the reactants

Tags

NGSS.MS-PS1-5

Your mother used pancake mix, eggs, and milk to make pancakes.  Which of these is the product?

• the pancake mix
• the eggs
• the milk
• the pancakes

How do chemical reactions turn substances into new substances?

• with burning acid
• the molecules mix together and create new substances
• the atoms break apart and combine back together in new ways
• the ionic compounds mix in water to form solutions

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a common sign that a chemical change has occurred?

• A chemical has turned a different color, bubbled, and/or changed temperature.

• A chemical has changed to a different state of matter, such as a liquid to a solid.

• A chemical has changed size.

• A chemical has become a different shape.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Why is tearing a piece of paper only a physical change?

• It changes the paper. 
• It is hard to tear. 
• It only changes its size, but it's still paper
• None of the above

If you double the amount of reactants, the amount of product will

• Double

• Half

• Stay the same