transcript
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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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