Science Kids: All About Chemical Reactions

An example of a chemical property is reactivity. This is 

• a measure of how easily a substance combines with other substances to produce a new substance 
• the danger to your health caused when a poisonous substance combines with chemicals in your body 
• an indicator of how easily a substance catches fire. This creates a new substance 

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A group of atoms bonded together. 

• A Molecule
• The Coefficient
• The Subscript
• An Atom Party

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How many hydrogen atoms are in this chemical formula: 

• 4 hydrogen atoms
• 1 hydrogen atom
• 2 hydrogen atoms
• 3 hydrogen atoms

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How many molecules are in this chemical formula?

• 4 Molecules
• 6 Molecules
• 2 Molecules
• 5 Molecules

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How many oxygen atoms are in this chemical formula?

• 6 oxygen atoms
• 2 oxygen atoms
• 3 oxygen atoms
• 4 oxygen atoms

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The one or two letters used to represent elements 

• Yield sign
• Coefficient
• Symbol
• Subscript

Element or compound?
H₂O

• element
• compound

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NGSS.MS-PS1-1

Element or compound?
O₂

• Element
• Compound

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How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

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NGSS.MS-PS1-1

A physical change is?

• It changes the object into something different
• Objects or substances undergo a change that does not change their chemical composition
• it is just like a chemical reaction
• Paper burning