Science Revision - Chemestry and Physics

A chemical change happens when...

• a substance is changed at the atomic level 
• bonds are broken and formed 
• a new substance is made
• all of the above! 

Chemical Formulas ...

• are written in alphabetical order 
• represent the destruction or creation of atoms 
• represent how atoms are arranged in a chemical reaction 

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

NGSS.MS-LS1-7

The compounds or elements present at the end of a reaction 

• reactants
• catalyst
• products
• energy 

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The compounds and elements that are present at the beginning of a reaction:

• reactants
• catalyst
• products
• energy 

What is the law of Conservation of Mass?

• A measure of how much mass is created or destroyed. 
• Mass can neither be created nor destroyed during a chemical reaction. 

Tags

NGSS.MS-PS1-5

What is a reactant?

• The starting substance
• The ending substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a product?

• The starting substance
• The ending substance

Tags

NGSS.MS-PS1-5

Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the reactant(s).

• Hydrogen and Oxygen
• water

Tags

NGSS.MS-PS1-2

Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the product(s).

• Hydrogen and oxygen
• water

Tags

NGSS.MS-PS1-2

^{Angelina mixes 2 substances together in a beaker. The beaker becomes hot and the liquid changes color.
Did a chemical reaction occur?}

• yes, because the properties changed and a new substance was made.
• no, because the properties did not change.

Tags

NGSS.MS-PS1-2