Chemical Chemical Properties and Properties and

Chemical ChangeChemical Change

What are Chemical What are Chemical Properties?Properties?

A A chemical property chemical property describes the describes the ability of a substance to change into a ability of a substance to change into a new substance or substances through new substance or substances through a chemical reaction.a chemical reaction.

This includes:This includes:

How a substance interacts with How a substance interacts with other substancesother substances

How a substance reacts when How a substance reacts when exposed to heat or lightexposed to heat or light

What is Chemical What is Chemical Change?Change?

A A chemical change chemical change means that a means that a chemical reaction chemical reaction has occurred and has occurred and as a result we have a new as a result we have a new substance or substancessubstance or substances

Example:Example:

If you combine baking soda and If you combine baking soda and vinegar you will produce a vinegar you will produce a chemical reaction that produces chemical reaction that produces gas bubbles (CO2) and water!gas bubbles (CO2) and water!

Types of Chemical Types of Chemical PropertiesProperties

Absorbs heat during a reactionAbsorbs heat during a reaction

CombustibleCombustible

Forms gasForms gas

Reacts with acidReacts with acid

Reacts with waterReacts with water

Emits heat during reactionEmits heat during reaction

Emits light during a reactionEmits light during a reaction

Forms a precipitate (solid) in a solutionForms a precipitate (solid) in a solution

Heat and Heat and Chemical ChangeChemical ChangeSometimes when we add heat to a Sometimes when we add heat to a substance it undergoes a chemical substance it undergoes a chemical changechange

When baking powder is heated, it When baking powder is heated, it produces CO2produces CO2

This is what makes cakes light and fluffy!This is what makes cakes light and fluffy!

Burning is another example of chemical Burning is another example of chemical changechange

Paper will burst into flame when heated Paper will burst into flame when heated above a certain temperature!above a certain temperature!

CombustibilityCombustibility

The ability of a substance to The ability of a substance to react quickly with oxygen to react quickly with oxygen to produce heat and light.produce heat and light.

Or in other words…the ability Or in other words…the ability of a substance to BURN!of a substance to BURN!

How do chemical How do chemical cold packs get cold?cold packs get cold?

A chemical cold pack is a sack full A chemical cold pack is a sack full of water that has an inner of water that has an inner compartment tube that is filled with compartment tube that is filled with chemicals (Ammonium Nitrate).chemicals (Ammonium Nitrate).

When you break the tube inside, When you break the tube inside, the chemicals mix with the water the chemicals mix with the water and create a reactions that removes and create a reactions that removes heat from its surroundings. heat from its surroundings.

This makes the pack feel COLD!!This makes the pack feel COLD!!

HomeworkHomeworkPage 153 – Learning Checkpoint – Page 153 – Learning Checkpoint – Physical and Chemical Change Physical and Chemical Change

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