Physical Property
What type of reaction occurs when two or more bonded atoms of reactants break apart and form new bonds in the products
Chemical reactions
What are reactants and products?
Reactants are the substances that undergo chemical reactions and produce the products
What is a physical property?
When a substance undergoes a change in appearance but not in its chemical nature
What is a chemical property?
Any characteristic that gives a substance the ability to undergo a change that results in a new substance.
True or false:
Physical states of matter are not usually written in chemical equations
What is the law of conservation of mass?
Matter is never destroyed or created, the mass that you begin with is always the same as the mass you will end with.
True or false:
Physical changes are not reversible
False
True or false:
Most chemical reactions are reversible
True
What do the coefficients represent in the chemical equations?
The relative number of moles or molecules of each substance involved in the reaction
Who discovered the law of conservation of mass and what reactions breaks the law?
French chemist Antoine Lavoisier, combustion
What are three examples of physical changes
Melting, burning, freezing, color changes
What are three examples of chemical reactions
Combustion, rotting, rusting, digestion
What does the arrow represent in a chemical equation?
A reaction arrow just tells you that a change has taken place and one thing has turned into another and the direction of the reaction
What are endothermic and exothermic reactions?
Endothermic reaction: occurs when when energy is applied
Exothermic reaction: reactions that releases energy in the form of heat
What are the other 5 physical changes of states? (One is melting)
Double points if you can tell me which states of matter each one is
Evaporation, condensation, freezing, disposition, sublimation
How are chemical reactions different from physical reactions?
Physical reactions do not change in chemical composition, whereas chemical reactions change the chemical composition
Describe how a chemical equations is written, include the terms reactants, products, arrow, and coefficients
Reactants are on the left followed by an arrow and the products on the right with coefficients written where necessary
How does surface area and temperature effect the speed of a reaction?
Surface area: The larger the exposed surface area between reactants the faster the reaction
Temperature: Direct relationship, the rate of a chemical reactions decreases as the temperature decrease and vice versa