6 A molecule is the smallest unit of a Substance that keeps all of the Physical and chemical propertiesOf that substance.
7 A pure substance is a sample of matter, Either a single element or a Single compound, that has definiteChemical and physical properties.A mixture is a combination of two orMore substances that are NOTChemically combined.
8 A mixture where everything is evenly Distributed is called homogeneous.A mixture that is NOT evenly distributedIs called a heterogeneous mixture.
9 A chemical formula is a combination Of chemical symbols and numbers To represent a substance.
10 Some properties of matter, such as Color and shape, are called Physical properties.
11 Some physical properties are: Mass, volume and Density. An easily observed physical propertyIs its state: solid, liquid or gas.
12 Melting point is the temperature and Pressure at which a solid Becomes a liquid.Boiling point is the temperatureAnd pressure at which a liquidBecomes a gas.
13 Solids, liquids and gases are matter, so they all have density. Density is a property of material independent of quantity or shape.
14 10.1 DensityThe units used for density depend on whether the substance is solid or liquid.For liquids use units of grams per milliliter (g/mL)For solids use density in units of g/cm3 or kg/m3.
16 10.1 Determining DensityTo find the density of a material, you need to know the mass and volume of a solid sample of the material.Mass is measured with a balance or scale.Use the displacement method or calculate the volume.
18 Solving Problems A solid wax candle has a volume of 1,700 mL. The candle has a mass of 1,500 g.What is the density of the candle?Solution:1,500 g ÷ 1,700 mL = g/mL
19 Chemical property is a property of Matter that describes a substance’s Ability to participate is chemical reactions.Reactivity is the ability of a substanceTo combine chemically withAnother substance.
20 Flammability is the ability of a Substance to react in the presence Of oxygen and burn whenExposed to a flame.
21 There are 2 kinds of changes for matter Of MatterThere are 2 kinds of changes for matterChemical&Physical
22 A physical change is any change in the size, shape, or phase of matter in which the identity of a substance does not change.For example, when water is frozen, it changes from a liquid to a solid.
23 Any change that transforms one substance into a different substance is called a chemical change. Iron reacts with oxygen to form iron oxide.Ex. If you leave a nail outside, it rusts.