We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byXimena Farrand
Modified over 4 years ago
TOPIC: Heat AIM: How do substances change from one phase to another?
States (phases) of matter 1. SOLID Molecules packed closely together Vibrate in place
Definite volume & shape
2. LIQUID Molecules farther apart & move around
Definite volume No definite shape
3. GAS Molecules very far apart & move around very fast A lot of empty space (smaller density)
No definite shape or volume
4. PLASMA High energy molecules Sun, stars, lightening, fluorescent & neon lights
Can you find the different phases of matter in this picture?
2 types of changes 1. Physical change Phase change Does not produce a new substance (change in appearance)
Examples: freezing, melting, evaporation, tearing, crushing
2. Chemical Change Produces a NEW substance Examples: burning, rusting
Paper ash, smoke, heat
Iron + oxygen iron oxide (rust)
Raw egg cooked egg Cake batter Cake
+ Sodium Chlorine NaCl = Sodium Chloride (salt)
Phase change Physical change Requires heat energy
Freezing Liquid Solid Heat removed
Melting Solid Liquid Heat added
Evaporation Liquid Gas Heat added Vaporization
Condensation Gas Liquid Heat removed
Opposite of evaporation
Sublimation Solid Gas Heat added Example: Dry ice (solid CO 2 gas)
Example: Iodine crystals gas (slightly above room temp) Crystals Gas
Freezing L S Melting S L Evaporation L G Condensation G L Add heat Energy absorbed by molecules Remove heat Energy released by molecules PHASE CHANGES SOLIDLIQUID GAS
Freezing point Temp at which a liquid freezes (L S) FP of water = 0°C
Melting point Temp at which a substance melts (S L) MP of water = 0°C
Freezing Pt = Melting Pt
Boiling point Temp at which a substance evaporates (L G) BP of water = 100°C
Evaporation occurs at the surface of a liquid (left). When a liquid boils, gas bubbles form throughout the liquid and then rise out of the liquid (right).
Temp of a substance during phase change Stays the same until all of the substance has changed Why? Bc the energy is needed to change the substance, not the temperature
When water reaches its boiling point, it stays at 100°C until it all changes to steam. Them temperature of the steam can then rise above 100°C.
Time TEMPTEMP Freezing/melting point = 0°C Boiling pt = 100°C SOLID LIQUID GAS 100°C 0°C Melting Freezing Evaporation Condensation PHASE CHANGE GRAPH FOR WATER = phase changes
What is a mixture? 2 or more substances put together No new substances (not chemically combined) Ex: salt water, salad…
Can be separated (Boiling, magnets, Filtering…)
What is a solution? Type of mixture 1 substance dissolved in another
2 parts: 1. Solute = what gets dissolved 2. Solvent = what does the dissolving
Example: Hot chocolate Solvent = Water Solute = Chocolate
SolubleAble to dissolve Ex: sugar is soluble in water
What affects the rate of dissolving? 1. Heat (more heat dissolves faster) 2. Surface area (more surface area/smaller pieces dissolves faster) 3. Stirring
SolubilityMax amount of substance that will dissolve in a certain amount of liquid
At 20°C, 38 grams of salt will dissolve in 100 grams of water. If more salt is added, it will not dissolve. It will sink to the bottom.
How does temp affect solubility? Temperature increases solubility
Solubility curves, like the one shown here, tell us what mass of solute will dissolve in 100g of water.
Solids, Liquids, Gases and Plasmas
Solids, Liquids, and Gases
AIM: How can we identify the chemical & physical properties of matter? (PSKI#3) 5/10/13 DO NOW: 1.Pick up today’s quiz & finish it HOMEWORK: 1.Read p.
Matter: Properties & Change
State Changes AKA= Phase Changes. Review: 3 States of Matter Solid Liquid Gas.
Phase Changes A change from one state of matter (solid, liquid, gas) to another. Physical change because appearance is changed, not chemical make-up; reversible.
2015 Adapted from: Chumbler - Properties of Matter
Matter What is matter? Anything that takes up space and has mass is matter.
Unit 2: “Matter and Change”
Matter Unit Test Review
Changes of State.
Chemistry. Describing Matter Matter – anything that has a mass and takes up space. Air, plastic, metal wood, glass, paper, and water are all matter.
Phase Changes Melting Vaporization Condensation Freezing Sublimation.
The Matter of Facts!.
Matter and Changes Matter - anything that has mass and takes up space.
Anything that has mass and takes up space!
© 2018 SlidePlayer.com Inc. All rights reserved.