Chemical And Physical Change Flashcards
(11 cards)
What is a chemical change?
A process where one or more substances are transformed into new substances with different properties.
Evidence of Chemical Change
Colour change, gas production (bubbles), energy change, odour change
What is a physical change?
Alters the appearance or form of substance, but doesn’t change its chemical composition
Evidence of physical change
Melting, density, change of size, volume
What is an endothermic reaction?
Absorbs energy (feels cold)
What is an exothermic?
Releases energy (feels cold)
What type of chemical reaction is A + B = AB
Formation
What’s the formula for Decomposition?
AB = A + B
Formula for single replacement
A + BC = AC + B
Formula for double replacement
AB + CD = AD + CB
Formula for HC Combustion
Hydrocarbon + O2 = CO2 + H2O
