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What are physical changes?
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Physical changes are alterations in the form or appearance of a substance, without a change in its chemical composition.
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What is a chemical change?
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A chemical change occurs when a substance combines with another to form a new substance, with different chemical properties.
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Give an example of a physical change.
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An example of a physical change is melting ice into water.
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Give an example of a chemical change.
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An example of a chemical change is rust forming on iron.
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What are social changes?
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Social changes refer to shifts or transformations in the cultural, social, or economic structures of a society.
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What are some factors that can influence social changes?
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Factors can include technology, economic shifts, politics, and cultural movements.
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What is a reversible change?
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A reversible change is one that can be undone, returning substance to its original state, like freezing and melting water.
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What is an irreversible change?
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An irreversible change is permanent and cannot easily be undone, such as burning wood.
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How do chemical changes differ from physical changes in terms of energy?
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Chemical changes often involve a transfer of energy, such as heat, light, or electricity, whereas physical changes usually do not alter the energy state significantly.
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Can all chemical changes be observed directly?
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No, not all chemical changes are directly observable as some may occur on a microscopic level without visible evidence.
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What role do catalysts play in chemical changes?
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Catalysts speed up chemical reactions without being consumed by the reaction itself.
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What is a precipitate in chemical changes?
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A precipitate is a solid formed in a solution during a chemical change.
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How can you tell if a chemical change has occurred?
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Indicators might include color change, temperature change, formation of a gas, or formation of a precipitate.
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Why are social changes important to study?
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Studying social changes helps us understand and adapt to the evolving structures and norms in society.
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What can cause a physical object to change shape without changing chemically?
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Applying force, such as bending or stretching, can change the shape of a physical object without altering its chemical structure.
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