STAAR Review 2024 8th Science

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What is Newton's Law of Force and Acceleration?

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It states that the net force on an object is equal to the object's mass multiplied by its acceleration (F = ma). It implies that more force is needed to move an object with greater mass.

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What is an atom?

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An atom is the smallest unit of an element, consisting of protons, neutrons, and electrons.

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What is a chemical reaction?

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A process where substances (reactants) are transformed into different substances (products), often involving the breaking and forming of chemical bonds.

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What is a decomposer?

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Organisms that break down dead organic material, such as mold, fungus, bacteria, and worms, returning nutrients to the ecosystem.

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What is the role of baking soda in a chemical reaction with hydrochloric acid?

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Baking soda (sodium bicarbonate) reacts with hydrochloric acid to produce carbon dioxide gas, water, and sodium chloride, indicating a chemical reaction.

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What is pollution runoff?

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Pollution runoff refers to the flow of pollutants from land into water bodies, often due to rain or melting snow, which can harm aquatic ecosystems.

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What is the Law of Inertia?

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Newton's first law, stating that an object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.

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What is the Law of Action-Reaction?

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Newton's third law, stating that for every action, there is an equal and opposite reaction.

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What is the difference between a producer and a consumer?

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Producers create their own food through photosynthesis (e.g., plants), while consumers obtain energy by eating other organisms.

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What is the significance of fish populations in coastal ecosystems?

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Fish populations are crucial for maintaining the balance of marine ecosystems, affecting food webs and biodiversity.

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