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Chapter 2 Review
Transcript of Chapter 2 Review
Physical property- a characteristic of a substance that can be observed without changing the identity of the substance
Physical change- a change in a substance that does not change the substance into a different one
Melting- the process by which a solid becomes a liquid
Melting point- the lowest temperature at which a substance begins to melt
Identifying Unknown Substances
Measure several different properties of the unknown liquid and compare them with properties known.
You might observe the properties such as color, odor, texture,density, boiling point, and freezing point.
Density- a property of matter representing the mass per unit volume
Section 1: Vocabulary
Chemical property- a characteristic of a substance that describes how it can form a new substance
Chemical change- a change of one substance into another substance
Matter has observable properties.
Changes of states are physical changes.
Freezing- the process by which a liquid becomes a solid
Freezing point- the temperature at which a specific liquid becomes a solid
Evaporation- a process by which a liquid becomes a gas
Sublimation- when a solid changes directly to gas
Boiling- another process by which a liquid becomes a gas
Boiling point- the temperature at which a substance changes from its liquid state to its gas state through boiling
Condensation- the process by which a gas changes its state to become a liquid
Properties are used to identify substances.
Properties Used for Identifying Substances
Physical property- the color of a substance
Density- mass divided by volume
Physical change- Breaking a piece of clay or breaking a pencil in half
Chemical property- iron rusting
Chemical change- iron fence rusting
Signs of Chemical Change
Production of Odor- Ex: When an egg rots it produces the smell of sulfur
Change in Temperature- Ex: A pile of wood burning in a campfire
Change in Color- Ex: Fruit changes color when it is ripen
Formation of Bubble- Ex: When an antacid tablet makes contact with water or when Mentoes tablet is put in soda
Formation of a solid- Ex: When two liquids are combined a solid called precipitate can form. Ex:The shells of a clam or mussel.
Liquid- a fixed volume and does not have a fixed shape
Particles move at different rates. The faster ones at the surface break away from the liquid and becomes a gas.
Solid- a fixed shape and volume
As he particles heat up, they vibrate faster, as they vibrate faster they loosen. They slide past one another, they substance melts and becomes becomes a liquid
Gas- does NOT have a fixed shape or volume
When you cool a gas, it loosens. The particles move slower and the particles start to form droplets of water. This cause condensation.