Warm-up Remember the three different intermolecular forces we discussed (look back in your notes if you don’t remember). What are the three types? How.

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Presentation transcript:

Warm-up Remember the three different intermolecular forces we discussed (look back in your notes if you don’t remember). What are the three types? How do you know which type is present in a molecule? Look at the two formulas on the board. Which intermolecular forces are present?

Warm Up What are some properties of solids that you can think of? What are some properties of liquids that you can think of? What are some properties of gasses that you can think of?

States of Matter Unit 8, Day 1

Venn Diagram

Properties of a solid Not compressible Rigid Definite Shape and volume No Diffusion

Properties of Liquids Not compressible Fluid Definite volume No Definite Shape Diffusion

Properties of Gasses Compressible No definite shape or volume Diffusion

What happens when states change… Solids can become liquids and liquids can become gases. As a substance changes from one state to another it must gain or lose energy. Solids – lowest kinetic energy Liquids – medium kinetic energy Gases – highest kinetic energy

Adding Energy to a solid.

What happens when you heat a substance? Two possible things happen: The substance changes temperature The substance changes state of matter Note: It is only one of the above, NEVER both at one time. This can be represented by a heating curve.

Heating Curves A graphical representation of the temperature and energy involved in heating a substance.

When a substance changes temperature. Specific Heat = The amount of energy required to raise the temperature of 1 gram of a substance by 1°C. Note! Every substance has a unique specific heat. q=mcΔT

q=mcΔT q = heat absorbed or released (most often in Joules) m = mass of the sample in grams c = the specific heat of the substance (J/g°C) ΔT = the change in temperature in degrees Celsius When solving a word problem, start by writing down your givens and figuring out what you are looking for. Then solve for the variable.

Example How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?

Example Calculate the heat capacity of a piece of wood if 1500.0 g of the wood absorbs 6.75×104 joules of heat, and its temperature changes from 32°C to 57°C

Example To what temperature will a 50.0 g piece of glass raise if it absorbs 5275 joules of heat and its specific heat capacity is 0.50 J/g°C? The initial temperature of the glass is 20.0°C.