Podcast
Questions and Answers
What is a characteristic of pure substances?
What is a characteristic of pure substances?
- Has a variable composition
- Can be broken into other pure substances by physical processes
- Exists in only one state of matter
- Properties do not change (correct)
Matter can change from one form to another.
Matter can change from one form to another.
True (A)
What is an example of a physical change?
What is an example of a physical change?
Crushing a can
What occurs during a chemical change?
What occurs during a chemical change?
Which of the following is an example of a compound?
Which of the following is an example of a compound?
A mixture is a combination of two or more _____ substances.
A mixture is a combination of two or more _____ substances.
Which of the following is a physical property?
Which of the following is a physical property?
What change occurs when iron rusts?
What change occurs when iron rusts?
Study Notes
Properties of Matter
- Matter is anything that has mass and occupies space, existing in three states: solid, liquid, and gas.
- Changes in matter can be categorized as chemical or physical.
Classification of Matter
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Pure Substances: Have a fixed composition with properties that do not change.
- Composed of identical atoms (elements) or two or more elements in a fixed ratio (compounds).
- Can be naturally occurring or synthetic.
-
Elements:
- Composed of identical atoms and listed on the periodic table.
- Examples: hydrogen, oxygen, carbon, titanium.
-
Compounds:
- Formed from two or more elements combined in a fixed mass ratio.
- Characterized by chemical formulas which represent atomic ratios.
- Examples: water (H2O) and carbon dioxide (CO2).
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Mixtures:
- Combinations of two or more pure substances that retain their individual properties.
- Components can be present in any mass ratio.
Chemical Changes
- Involve conversion of a substance into another, altering its chemical composition.
- Examples: rusting of iron, burning wood, cooking an egg.
Physical Changes
- Changes that do not alter the chemical composition of a substance.
- Typically involve changes in physical appearance or state.
- Examples: crushing a can, melting, boiling, or mixing substances like salt with water.
Chemical Properties
- Refer to the ability of a substance to combine or change into other substances.
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Description
Prepare for your Chemistry 1 midterm exam with this comprehensive review focused on general properties of substances. Explore key concepts such as chemical changes, rusting of iron, flammability, and acidity. Test your understanding and boost your confidence before the exam.
