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What is a chemical change?
A change where a new substance is formed
What is another name for a chemical change?
A chemical reaction
What are reactants?
Substances present at the start of a reaction
What are products?
Substances formed at the end of a reaction
What does the arrow (→) mean in a chemical equation?
Reacts to form
What sign of reaction is shown when bubbles appear?
Gas produced
What sign of reaction is shown when temperature increases or decreases?
Temperature change
What sign of reaction occurs when a solid forms from liquids?
Precipitate formed
In the equation Magnesium + oxygen → what is the product?
Magnesium oxide
What is a word equation?
An equation that uses words to describe a reaction
What is a symbol equation?
An equation that uses chemical symbols instead of words
What is the symbol equation for hydrogen reacting with oxygen?
H₂ + O₂ → H₂O
What is the symbol equation for magnesium reacting with oxygen?
Mg + O₂ → MgO
What evidence shows gas is produced in a reaction?
Bubbles appear
What does a new smell during a reaction suggest?
A chemical reaction occurred
Is melting ice a chemical change or physical change?
Physical change
