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Chemistry is the study of Matter and the transformation It can undergo. Matter is anything that Occupies space. It is the stuff that makes up All things.

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An element is a substance that cannot Be separated or broken down into Simpler substances by chemical means An atom is the smallest unit of an element That maintains the properties of That element.

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A compound is a substance made from Atoms of two or more different Elements that are chemically combined.

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A molecule is the smallest unit of a Substance that keeps all of the Physical and chemical properties Of that substance.

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A pure substance is a sample of matter, Either a single element or a Single compound, that has definite Chemical and physical properties. A mixture is a combination of two or More substances that are NOT Chemically combined.

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A mixture where everything is evenly Distributed is called homogeneous. A mixture that is NOT evenly distributed Is called a heterogeneous mixture.

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A chemical formula is a combination Of chemical symbols and numbers To represent a substance.

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Some properties of matter, such as Color and shape, are called Physical properties.

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Some physical properties are: Mass, volume and Density. An easily observed physical property Is its state: solid, liquid or gas.

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Boiling point is the temperature And pressure at which a liquid Becomes a gas. Melting point is the temperature and Pressure at which a solid Becomes a liquid.

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Solids, liquids and gases are matter, so they all have density. Density is a property of material independent of quantity or shape.

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10.1 Density The 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/cm 3 or kg/m 3.

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10.1 Determining Density To find the density of a material, you need to know the mass and volume of a solid sample of the material. 1.Mass is measured with a balance or scale. 2.Use the displacement method or calculate the volume.

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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? Solving Problems Solution: 1,500 g 1,700 mL = 0.8823529 g/mL

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Chemical property is a property of Matter that describes a substances Ability to participate is chemical reactions. Reactivity is the ability of a substance To combine chemically with Another substance.

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Flammability is the ability of a Substance to react in the presence Of oxygen and burn when Exposed to a flame.

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There are 2 kinds of changes for matter Chemical & Physical

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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.

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Any change that transforms one substance into a different substance is called a chemical change. Ex. If you leave a nail outside, it rusts. Iron reacts with oxygen to form iron oxide.

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