Physical and Chemical Properties of Matter

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and boiling.

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What is a chemical change?

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A chemical change occurs when a substance transforms into a different substance with different properties. This often involves a chemical reaction, such as burning or rusting.

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What is density?

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Density is the mass of an object divided by its volume, typically expressed in grams per cubic centimeter (g/cm³). It indicates how much matter is packed into a given space.

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How do you calculate density?

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Density = Mass / Volume. For example, if an object has a mass of 10g and a volume of 2cm³, its density is 5g/cm³.

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What happens to the density of an object when it is heated?

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Generally, the density of an object decreases when it is heated because its volume increases while its mass remains the same.

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What is an example of a physical change?

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An example of a physical change is water boiling and turning into steam.

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What is an example of a chemical change?

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An example of a chemical change is baking soda reacting with vinegar to produce carbon dioxide gas.

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What is the density of water?

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The density of water is approximately 1 g/cm³ at 4°C.

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What will happen to an object with a density less than 1 g/cm³ when placed in water?

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An object with a density less than 1 g/cm³ will float on water.

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What is the density of an object with a mass of 14g and a volume of 2cm³?

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The density is 7 g/cm³ (Density = Mass/Volume = 14g/2cm³).