Matter & Energy Chapter 2 Review Begin

Which of the following is NOT an example of a physical property? Shape Color Mass Rust

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The measure of the amount of matter an object contains within a given volume is called? Density Mass Volume Area

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Which item has a lower density? A box of feathers A box of pennies

Good Work! Next Question A box of feathers has a lower density than a box of pennies because the volume of feathers has a lower mass than an equal volume of pennies. Next Question

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Which of the following examples is a clear sign that a chemical change has occurred? Change in size Production of an odor It disappears The weight has changed

Good Work! Next Question Chemical changes may produce new smells. For example, rotting eggs produce the smell of sulfur. Next Question

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True or False: Changes of state are physical changes.

A liquid can change into a gas, and a gas can turn into a liquid. Good Work! A solid can change into a liquid substance, and a liquid can turn into a solid substance. A liquid can change into a gas, and a gas can turn into a liquid. Next Question

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The point at which a solid's particles vibrate fast enough to break away from each other and turn into a liquid is called? Melting point Freezing point Evaporation Sublimation

Good Work! Next Question The melting point of some solids is well-defined, such as those for ice and steel. These substances have orderly structures, so melting will start at a specific temperature. Other substances, such as chocolate and plastic, melt gradually over a wide range of temperatures. Next Question

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True or False: The melting point and freezing point of a substance is the same.

Good Work! Next Question Above the melting/freezing point, the substance is a liquid; below the melting/freezing point, the substance is a solid. At the melting/freezing point, the substance can be either solid or liquid. Next Question

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What is the process by which a liquid becomes a gas? Condensation Melting Evaporation Sublimation

Good Work! Next Question Particles in liquids move at different speeds. The fastest moving particles can escape from the surface of a liquid. Since warmer liquids have faster moving particles, evaporation occurs more quickly when a substance is warmer. For example, water evaporates more quickly on a warm day than a cool day. Next Question

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What is the process by which a solid turns directly into a gas? Condensation Melting Evaporation Sublimation

Good Work! Next Question Dry ice, which is frozen carbon dioxide, turns directly into carbon dioxide gas under normal conditions. Next Question

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What is the measure of how well a solid dissolves in a liquid? Melting point Density Solubility Chemical Change

Good Work! Next Question For example, a spoonful of sugar dissolves in water very easily if you pour it in and stir it with the spoon. Much of a spoonful of dirt will settle to the bottom of a glass of water when you stop stirring. Next Question

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11. 0 g of pure gold has a volume of 2. 00 cm³ 11.0 g of pure gold has a volume of 2.00 cm³. What is the density of gold? 5.0 g/cm³ 4.8 g/cm³ 5.7 g/cm³ 5.5 g/cm³

Density=Mass/Volume. 11.0 g divided by 2.00 cm³ is 5.5 g/cm³. Good Work! Density=Mass/Volume. 11.0 g divided by 2.00 cm³ is 5.5 g/cm³. Next Question

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Which of these is a chemical change, not a physical change? Breaking a ball of clay into 2 pieces An ice cube melting Baking a cake Water boiling

Changing from one state to another is a physical change. Good Work! Changing from one state to another is a physical change. Burning, cooking, baking, and rusting are examples of chemical changes. Next Question

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An example of evaporation is when: Ice cream in a freezer slowly forms ice crystals Just-washed hands are rubbed on a towel Grass wet with dew slowly dries in the morning sunshine Eggs are hard-boiled

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The melting point of aluminum is 660° The melting point of aluminum is 660°. Is aluminum a solid or a liquid at room temperature (23°)? Solid Liquid

Good Work! Next Question If aluminum’s melting point is 660°, then it will remain a solid until it reaches that temperature. Next Question

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A physical change in a substance: Creates a different substance but not different physical properties Creates a different substance with different physical properties Does not change either the substance or its physical properties Changes a physical property but not the substance itself

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As a solid heats up, its particles gain energy and vibrate As a solid heats up, its particles gain energy and vibrate. When they vibrate enough, the particles move away from one another. That describes: Condensation Melting Freezing Boiling

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Congratulations! You know your matter and energy facts!