Find your seats and take out your notebook.
Agenda for Tuesday March 22nd 1.Matter and Mixtures Notes
Composition of Matter• Matter – anything that has mass and takes up
space
• Element – substance that cannot be separated or broken down into simpler substances
• Atom – smallest unit of an element that maintains the properties of that element
Compounds
• Compound – substance with 2 or more different atoms (elements)
• Molecules – smallest unit of a compound that still maintains the properties of the compound
• Chemical Formulas
Mixtures
• Pure substances – only 1 element or compound
• Mixture – combination of 2 or more substances– Homogenous – contains substances blended evenly
throughout– Heterogeneous – a mixture of different substances
that can easily be distinguished from each other
Homogenous Mixtures
• Solution– homogenous mixtures– small particles, cannot be seen with a microscope– Particles do not settle to the bottom
• Examples– Salt water– Sugar water
Heterogeneous Mixtures
• Suspensions - visible particles will settle – Muddy water
Heterogeneous Mixtures• Colloid = suspension where particles will not
settle out of the mixture on their own– Milk, fog, smoke, gelatin desserts
– Tyndall effect – scattering of light by larger particles
• Emulsion – two immiscible (unblendable) liquids mix together– mayonnaise
Predicting Types of Mixtures
1 substance2 Substances
Pure Substance Mixture
Separates easily/ on its own
Suspension
No visible particles, Looks uniform throughoutWon’t separate by physical means
Solution
Visible particles/cloudy
Colloid
Won’t separate on its own/cloudy
Heterogeneous mixture
Homogeneous Mixture
Homework
• Questions 1 – 8 page 44
• Questions 1-3, 7 on page 231
Define homogeneous and heterogeneous mixtures.
Agenda for Wednesday March 23rd 1.Mixture lab
What is the difference between a compound and an element?
Agenda for Thursday March 24th 1.Solubility Notes2.Solubility Lab
Key Terms• Solute – stuff we want to dissolve
• Solvent – substance in which we dissolve something
• Solubility – maximum amount of solute that can dissolve in a solvent– Different for different substances– Depends on pressure & temp
Concentration
• Concentration – amount of a solute dissolved in a given volume of solution– A lot of solute is called concentrated– Little solute is called dilute
Saturation
• Saturated – a solution that can dissolve no more solute– Excess solute visible
• Unsaturated – can dissolve more solute
• Supersaturated – holds more solute than it normally can
Kool – Aid Lab
Define Solvent and Solute
Agenda for Friday March 25th 1.Quiz2.Solubility of Salt lab3.Concept Review
List 2 factors that affect solubility.
Agenda for Monday March 28th 1.Salt Lab2.Physical/Chemical Properties
1. Demos
What is the common name for sodium chloride?
Agenda for Tuesday March 29th 1.Finish Lab2.Physical/Chemical Changes
Properties of Matter
• Physical – characteristic of a material you can manipulate without changing the identity of a substance– shape, size, density, melting point, boiling point, color
• Physical Change - a change in size, shape or state of matter– dissolving
Properties of Matter
• Chemical - characteristic of a substance that indicates whether it can undergo a certain chemical change– New substances produced– Reactivity, flammability (ability to burn)
• Chemical Change - change of one substance to another– accompanied by heat, light, color, and sound
States of Matter
• Kinetic Theory– All matter is made of atoms and molecules– These particles are always in motion. Higher temp =
faster movement– At same temp., heavier molecules move slower
• 3 different states of matter– Solid, liquid, gas