Chemical Changes
You know a chemical change has occurred if you see this type of new substance form, like rust on iron
What is new substance
This type of change alters a substance's form but not its chemical identity
What are physical changes of state
Both physical and chemical changes involve this happening to matter
What is a change in form, appearance, or composition
In a physical change, the substance keeps its identity; in a chemical change, this happens
What is the substance changes into a new one
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This type of gas release, like fizzing in vinegar an baking soda, is evidence of a chemical change
What is carbon dioxide
Ice melting, water boiling, and sugar dissolving in water are example of this
What are physical changes of state
Energy is always involved in both physical and chemical changes, usually in these two forms
What is hear and light
What is chemical change
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When hydrogen and oxygen combine to form water, its this type of reaction
What is synthesis reaction
This term describes a solid turning directly into gas without becoming a liquid first
What is sublimation
Both physical and chemical changes can sometimes look dramatic-like fizzing or melting-so scientists rely on this process to tell them apart
What is observation or experimentation
Physical changes can often be reversed; chemical changes usually cannot because of this
What is the formation or breaking of chemical bonds
This fruit is technically a berry, through many people think of it as a vegetable
What is a tomato
Cooking an egg is a chemical change because these building blocks of the egg white permanently change shape
What are proteins
When salt is dissolved into water, its physical change because this can separate them again
What is evaporation
In both physical and chemical changes, this fundamental property of matter is conserved, even if the form changes
What is mass
Melting, freezing, and boiling are physical changes, but rusting, cooking, and digesting food are examples of this
What are chemical changes
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This chemical reaction occurs when iron reacts with oxygen and water, forming a reddish brown substance
What is rusting
Unlike chemical changes, physical changes do not break or form those between atoms
What are chemical bonds
Both physical and chemical changes can happen in everyday life-this kitchen activity shows both types when chopping vegetables and cooking them
What is preparing food (cutting-physical, cooking- chemical
In physical changes, the molecules stay the same but just move closer or farther apart. In chemical changes, this happens in atoms
What is atoms rearrange to form new substance
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