# Matter. Day 1 How is matter organized ? The smallest particle of an element that still retains the properties of the element. atom.

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Matter

Day 1

How is matter organized ?

The smallest particle of an element that still retains the properties of the element. atom

A substance made up of atoms that are all alike. Element

A substance in which the atoms of two or more elements are chemically combined in fixed proportions. Compound or Molecule

Matter composed of two or more substances that can be separated by physical means. Mixture

Type of matter with a fixed composition (can be either an element or a compound). Pure Substance

A mixture that remains uniformly mixed and the particles are so small they can’t be seen with a microscope. Homogeneous Mixture

A mixture in which the different materials remain distinct. Heterogeneous Mixture

Lab – “Nuts and Bolts of Matter”  Copy definitions from book  Follow procedure on handout

Day 2 (February 27)

Class Objectives  Review states of matter  Oobleck  Phase change Gizmo

Review Solid, Liquid, Gas

Day 3 (March 3)  Phase change notes and worksheet  Graphing assignment  Density of water lab

Day 4 (March 5)  Density problems  Density of a paper clip lab  Chemical vs. physical properties and changes

Density  Mass per unit volume of a substance  D = m/v

What is the density of carbon dioxide gas if 0.196 g occupies a volume of 100 mL?

A block of wood 3.0 cm on each side has a mass of 27 g. What is the density of this block?

An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 2.0 mL. The height of the water rose to 7.0 mL. If the mass of the stone was 25 g, what was its density?

A 10.0 cm 3 sample of copper has a mass of 89.6 g. What is the density of copper?

A sample of iron has the dimensions of 2 cm x 3 cm x 2 cm. If the mass of this rectangular-shaped object is 94 g, what is the density of iron?

ChemicalPhysical All possible chemical changes Observed by senses; measurable properties Property Comparison

Change Comparison ChemicalPhysical Old substance destroyed; new substance formed New form of old substance; no new substances formed

Chemical Changes  Substance changes composition; 1 or more new substances formed

How do you know?  Production of a gas  Change in color  Formation of a precipitate  Production of new odor  Release/absorption of heat

Physical Changes  Changes that occur without a change in composition  Melting, freezing, etc.  Dissolving

Buoyancy  Tendency of a less dense substance to float in a more dense substance  Ice in water; different salt water conc. in lab

Viscosity  Resistance of a fluid to flow  Stronger particle attraction = more viscosity  Motor oils

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