Semester 1 Final Exam

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What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, gas production, or color changes.

Front

What is the best evidence of a chemical change?

Back

The best evidence of a chemical change is the production of a gas, which indicates that a new substance has formed.

Front

What is mechanical energy?

Back

Mechanical energy is the sum of kinetic and potential energy in an object, representing the energy of motion and position.

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What is a physical property?

Back

A physical property is a characteristic of a substance that can be observed or measured without changing its chemical identity, such as melting point or color.

Front

What is the melting point?

Back

The melting point is the temperature at which a solid becomes a liquid.

Front

How many elements are in Fayalite (Fe2SiO4)?

Back

Fayalite contains 3 elements: iron (Fe), silicon (Si), and oxygen (O).

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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 or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the definition of flammability?

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Flammability is the ability of a substance to catch fire and burn in the presence of an ignition source.

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What is reactivity in chemistry?

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Reactivity refers to how readily a substance undergoes a chemical reaction with other substances.

Front

What happens when sodium metal is placed in water?

Back

When sodium metal is placed in water, it reacts vigorously, producing hydrogen gas and heat, which can be evidence of a chemical change.