1st Semester Review

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What is a balanced force?

Back

A balanced force occurs when two forces acting on an object are equal in size but opposite in direction, resulting in no change in motion.

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What is an unbalanced force?

Back

An unbalanced force occurs when two forces acting on an object are not equal, causing the object to accelerate in the direction of the greater force.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include aluminum (Al) and oxygen (O).

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances, such as when iron rusts.

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What are metals?

Back

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?

Back

Nonmetals are elements that are usually dull, poor conductors of heat and electricity, and brittle. Examples include sulfur (S) and oxygen (O).

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals. Examples include silicon (Si) and boron (B).

Front

What is the formula for water?

Back

The formula for water is H2O, which consists of two hydrogen atoms and one oxygen atom.

Front

What is the formula for ammonia?

Back

The formula for ammonia is NH3, which consists of one nitrogen atom and three hydrogen atoms.