8th Grade Science Chem Review

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What are nonmetals?

Back

Nonmetals are elements that typically lack the characteristics of metals. They are usually poor conductors of heat and electricity, and they can be gases, liquids, or brittle solids at room temperature.

Front

What is a chemical reaction?

Back

A chemical reaction is a process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

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NGSS.MS-PS1-5

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together, resulting in properties that are different from the individual elements.

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NGSS.MS-PS1-1

Front

What is a periodic table?

Back

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

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Front

What is a group in the periodic table?

Back

A group is a vertical column in the periodic table that contains elements with similar chemical properties and the same number of valence electrons.

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What is a period in the periodic table?

Back

A period is a horizontal row in the periodic table, indicating elements with the same number of electron shells.

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What are metalloids?

Back

Metalloids are elements that have properties intermediate between metals and nonmetals. They are often semiconductors.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements chemically combined.

Tags

NGSS.MS-PS1-1

Front

What is the significance of valence electrons?

Back

Valence electrons are the outermost electrons of an atom and are important for determining how an element will react chemically with other elements.