Matter Part C

1

TABLE OF CONTENTSStates of Matter 2 – 10

Changes in state 11 – 12

Heating Curve & Heat equations 13 – 18

Practice Problems 17

Review questions 19 - 20

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5 STATES OF MATTER1)1) SolidSolid

2)2) LiquidLiquid

3)3) GasGas

Most common on Earth

4) Plasma

5) Bose-Einstein Condensate

Although there is matter all over the Universe, we typically see matter in solid, liquid or gas form.

3

4th state:4th state: PlasmaPlasma - formed at high temperatures; ionized phase of matter as found in the sun (gases stripped of electrons).

4

SOLID, LIQUID AND GAS

http://www.footprints-science.co.uk/states.htm

Click on the link and watch the animations belowThe Three States of Matter2.rm

Note the change in how the particles are arranged in each state.

5

COPPER PHASE - SOLID

6

LIQUID PHASE - COPPER

7

GAS PHASE - COPPER

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Some Properties of Solids, Liquids, and Gases

Property Solid Liquid Gas

Shape Has definite shape Takes the shape of Takes the shape the container of its container

Volume Has a definite volume Has a definite volume Fills the volume of the container

Arrangement of Fixed, very close Random, close Random, far apartParticles

Interactions between Very strong Strong Essentially noneparticles

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WHAT MAKES A STATE OF MATTER?

The state of matter is determined by the particles that make up the matter and their attraction to each other.

• solids have a large attraction and are packed tightly together

• the attraction in liquids is not as great so particles flow

• gases have no real attraction so particles spread out

Matter changes from one state to another when its energy changes (either loses or gains energy).

• when energy (heat) is added to ice it changes state to a liquid • more energy changes the liquid water to water vapor

KINETIC THEORY OF MATTER: ALL MATTER IS MADE UP OF PARTICLES IN CONSTANT RANDOM MOTION

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State of matter

Shape

Def Shape? (Y/N)

Volume

Def volume (Y/N)

Particle Attraction

Particle Arrangement

Solid YES YES VERY STRONG

CLOSE,

VIBRATE IN PLACE

Liquid NO YES STRONG CLOSE, SLIDE PAST EACH OTHER

Gas NO NO WEAK FREE TO MOVE ABOUT

YOU NEED TO KNOW UNDERSTAND THE INFORMATION IN THIS CHART!!!

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CHANGES OF STATEAdding or taking away energy causes substances to change state. Most of these changes in state are familiar.

Solid Liquid Gas

Melt Evaporate

CondenseFreeze

http://eanes.tx.schoolwebpages.com/education/components/docmgr/default.php?sectiondetailid=6107&fileitem=8730&catfilter=1594

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Click on the link below to watch how the particles of ice change as heat is added. You are not responsible for any questions on this animation.

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks3/science/changing_matter/index.htm

CHANGES OF STATE

Some changes in state are not so familiar. An important change in state is sublimation.

Sublimation is the change of a substance as it goes from a solid directly to a gas. The most common example being dry ice. Dry ice is frozen carbon dioxide gas.

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BIG TEST CONCEPTHEATING CURVE

solid

liquid

gas

Heat added

Tem

pera

ture

(oC

)

A

B

C

D

E

Heating Curve for Water

0

100

LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 487

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solid

liquid

gas

Heat added

Tem

pera

ture

(o C

)A

B

C

D

E

Heating Curve for Water

0

100

LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 487

KEY POINTS:A, C, and E show temperature is changing

1) As heat is added temperature changes just as expected.

2) The state of matter does not change.

3) The substance is gaining energy but does not have enough to change to a new state.

4) The equation Q = mCΔT is used alongside this graph.

Q = heat, measured in Joules (J)

m= mass, measured in grams (g)

C= specific heat, measured in J/g-oC

ΔT = change in temperature, measured in Celsius (oC)

We can measure each of these variables given enough information

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A NOTE ON SPECIFIC HEAT

Description:One paper cup is filled with water; the other is empty. When the cups are placed above a lit Bunsen burner, the empty cup burns, whereas the water-filled one doesn't. This is because the water absorbs most of the heat of the flame due to its high specific heat.

Specific Heat Capacity -  The ability of materials to "hold" a certain amount of thermal energy at a given temperature.  Consider a day at your favorite Carolina beach. On a typical summer day the sand is so hot it will burn your feet, yet the water feels much cooler and quite comfortable. The same holds true if you consider the parking lot. Each material experiences the same summer sun, but each heats up differently. Later that night the sand and parking lot would feel quite cool to the feet, and the water temperature will not have changed. Each material “holds” a certain amount of specific heat, and each will gain and lose that heat at different rates. The sand loses its heat really fast (low specific heat) the water loses heat slowly (high specific heat). The reverse is true, water must gain a lot of heat to change temperature, sand needs only a little to warm up quickly.

Not as bad as it looks…read on

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Q = m x C x ΔTDetermine the energy needed (in Joules) when 55.6 grams of water at 43.2 °C is heated to 78.1 °C.

Q = ?

m = 55.6 g

ΔT = Tf – Ti (final temp – initial temp)

78.1o – 43.2o = 34.9 oC

C = specific heat of water 4.18J (found on your reference table)

Q = 55.6g x 4.18J x 34.9oC = 8111 J of energy needed

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TRY ANOTHER PROBLEM

Determine the energy required when cooling 456.2 grams of water at 89.2 °C to a final temperature of 5.9 °C.

What is mass?

What is the change in temperature?

What is the specific heat of water? (remember your reference tables

Answer: Q = 456.2g x 4.18J x – 84.3oC = -160753 J

456.2 g

5.9 – 89.2 = -83.3oC

4.18J

http://www.sciencegeek.net/Shockwave/SpecificHeat.htm

Click on the link below to work some sample problems.

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1) Heat is added but temperature is NOT changing.

2) The flat lines at B and D represent where the substance is going through a change of state. At B it is melting/freezing, at D is boiling/condensing.

3) The temperature does not change when the state of matter changes because the added energy is used to break the attraction holding the particles. NOTE AS MORE ENERGY/HEAT IS ADDED THE PARTICLES GET FURTHER APART.

4) When no temperature change occurs the equations q=m Hf or q = mHv

are used to make calculations. Hf and Hv will be found on your reference sheets.

solid

liquid

gas

Heat added

Tem

pera

ture

(oC

)A

B

C

D

E

Heating Curve for Water

0

100

LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 487

B and D show an unchanging temperature

RETURN TO THE GRAPH

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Use the heating curve below to answer the following questions.

1. What is the melting point of the substance?2. What is the boiling point of the substance?3. Which letter represents heating of the solid?4. Which letter represents heating of the vapor?5. Which letter represents melting of the solid?6. Which letter represents boiling of the liquid?

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REVIEW1. A solid has a ____________ shape and takes up a

_____________ amount of space.

2. A ______________ has no definite shape and no definite volume.

3. A liquid has a ____________ shape and _____________ volume.

4. During a change in state, as energy is added, temperature (does or does not ) change.

5. The change of state when a substance goes from a solid directly to a gas is called _____________.