Podcast
Questions and Answers
The study of matter and how it changes is called physics.
The study of matter and how it changes is called physics.
False
Chemical change means a chemical reaction.
Chemical change means a chemical reaction.
True
All acids are safe to taste.
All acids are safe to taste.
False
Energy is the ability to do work.
Energy is the ability to do work.
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As pressure on a gas increases, it’s volume increases.
As pressure on a gas increases, it’s volume increases.
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Different kinds of energy are involved when we ride our bikes down a hill.
Different kinds of energy are involved when we ride our bikes down a hill.
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All solids melt at the same temperature.
All solids melt at the same temperature.
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Hardness is a chemical property.
Hardness is a chemical property.
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The sound of a teapot whistling represents a chemical change.
The sound of a teapot whistling represents a chemical change.
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Baking a cake is an example of a physical change.
Baking a cake is an example of a physical change.
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Water changing from a solid to a liquid is a chemical change.
Water changing from a solid to a liquid is a chemical change.
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In a solid, particles have the greatest freedom of movement.
In a solid, particles have the greatest freedom of movement.
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A thermometer is used to measure the mass of an object.
A thermometer is used to measure the mass of an object.
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Describing methane as a gas that easily catches fire is an example of a physical property.
Describing methane as a gas that easily catches fire is an example of a physical property.
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The reaction between an acid and zinc is an example of a physical change.
The reaction between an acid and zinc is an example of a physical change.
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The distance between two points can be measured in grams.
The distance between two points can be measured in grams.
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Study Notes
Chemical Changes and Physical Properties
- A chemical change represents a change in the substance itself, such as a log burning.
- An example of a chemical change that produces a new substance is combining ingredients and baking a cake.
- Water changing from a solid to a liquid is an example of a change of state.
Phases of Matter
- In a gas, particles of matter have the greatest freedom of movement.
- In a gas, particles move about most easily.
- A substance heated to its melting point will change from a solid to a liquid.
Physical Changes
- The breaking of a window involves a physical change only because no new substances are created.
- An example of a physical change is an ice cube changing from a solid to a liquid.
Measurement and Instruments
- A balance is used to measure the mass of an object.
- The abbreviation for centimeter is cm.
Chemical Properties
- If you describe methane as a gas that easily catches fire, you are describing a chemical property.
- When an acid reacts with zinc, it produces a gas, which is an example of a chemical change.
Chemistry and Energy
- The study of matter and how it changes is called chemistry.
- Chemical change means a chemical reaction.
- Energy is the ability to do work.
- As pressure on a gas increases, its volume decreases.
- As the temperature of a gas increases, its volume increases.
- Different kinds of energy are involved when we ride our bikes down a hill.
Properties of Matter
- A chemical change occurs when one or more substances combine or break apart to form a new substance.
- A pure substance is made up of only one kind of material and has definite properties.
- Hardness is a physical property.
- A corrosive substance eats away another material.
- The temperature at which a liquid boils is called its boiling point.
- The temperature at which a solid melts is called its melting point.
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Description
Identify examples of chemical changes and changes of state. Quiz questions cover various everyday scenarios and chemical reactions.
