Chemical Properties and Chemical Change

What are Chemical Properties? A chemical property describes the ability of a substance to change into a new substance or substances through a chemical reaction. This includes: How a substance interacts with other substances How a substance reacts when exposed to heat or light

What is Chemical Change? A chemical change means that a chemical reaction has occurred and as a result we have a new substance or substances Example: If you combine baking soda and vinegar you will produce a chemical reaction that produces gas bubbles (CO2) and water!

Types of Chemical Properties Absorbs heat during a reaction Combustible Forms gas Reacts with acid Reacts with water Emits heat during reaction Emits light during a reaction Forms a precipitate (solid) in a solution

Heat and Chemical Change Sometimes when we add heat to a substance it undergoes a chemical change When baking powder is heated, it produces CO2 This is what makes cakes light and fluffy! Burning is another example of chemical change Paper will burst into flame when heated above a certain temperature!

Combustibility The ability of a substance to react quickly with oxygen to produce heat and light. Or in other words…the ability of a substance to BURN!

How do chemical cold packs get cold? A chemical cold pack is a sack full of water that has an inner compartment tube that is filled with chemicals (Ammonium Nitrate). When you break the tube inside, the chemicals mix with the water and create a reactions that removes heat from its surroundings. This makes the pack feel COLD!!

Homework Page 153 – Learning Checkpoint – Physical and Chemical Change Questions 1-5