Grade 6 Science - Semester 1 Review

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O), hydrogen (H), and sodium (Na).

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. An example is carbon monoxide (CO), which consists of carbon and oxygen.

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What are metals?

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Metals are elements that are typically shiny, good conductors of heat and electricity, and malleable. Examples include iron (Fe) and copper (Cu).

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What are nonmetals?

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Nonmetals are elements that lack the characteristics of metals. They are usually poor conductors of heat and electricity. Examples include oxygen (O) and carbon (C).

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What are metalloids?

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Metalloids are elements that have properties of both metals and nonmetals. They are semiconductors and include elements like silicon (Si) and arsenic (As).

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What is the significance of a ramp's length in loading trucks?

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A longer ramp allows for a gentler incline, making it easier to load and unload heavy items compared to a shorter ramp.

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What is the periodic table?

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The periodic table is a tabular arrangement of elements organized by increasing atomic number, showing periodic trends in properties.

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What is the atomic number?

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The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

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What is a chemical formula?

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A chemical formula is a way of expressing the composition of a compound using symbols for its constituent elements, such as H2O for water.

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What is the difference between a physical change and a chemical change?

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A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.