final rev 2

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What are the names of different state changes?

Melting, boiling, condensation, freezing, sublimation

Which state changes involve energy absorption?

Melting and vaporization

Which state changes involve energy release?

Condensation and freezing

Why doesn't temperature increase at flat parts of the heating curve?

Energy is used to break bonds, not to increase particle speed

What are the temperatures at the flat parts of the heating curve?

0°C for melting/freezing, 100°C for vaporization/condensation

What is buoyant force?

The upward force a fluid exerts on an object

When does an object float?

When weight equals buoyant force

When does an object sink?

When weight is greater than buoyant force

What is a physical property?

A trait observed without changing the substance’s composition

Examples of physical properties?

Color, size, length

What is a chemical property?

A trait observed only during a chemical reaction

Examples of chemical properties?

Combusts, rusts, corrodes

What is a physical change?

A change in physical properties without changing the composition

Examples of physical changes?

Melting, boiling, cutting

What is a chemical change?

A change that alters the chemical composition of matter

What is a chemical change?

Burning, exploding, rusting

What does the Law of Conservation of Mass state?

Mass is neither created nor destroyed—only rearranged

What is a period on the periodic table?

A horizontal row

What is a group on the periodic table?

A vertical column

What elements are on the left side of the periodic table?

Metals

What elements are on the right side of the periodic table?

nonmetals

What metal is a liquid at room temperature?

Mercury

What nonmetal is a liquid at room temperature?

Bromine