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Questions and Answers
What happens when potassium is added to water?
What happens when potassium is added to water?
Iron oxide is a more reactive metal than aluminum.
Iron oxide is a more reactive metal than aluminum.
False (B)
What kind of reactions do metals that are more reactive perform with less reactive metals?
What kind of reactions do metals that are more reactive perform with less reactive metals?
Displacement reactions
When metals react with oxygen, magnesium burns with a __________ flame.
When metals react with oxygen, magnesium burns with a __________ flame.
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Match the metal with its reaction with water:
Match the metal with its reaction with water:
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Which of the following is NOT a sign of a chemical reaction?
Which of the following is NOT a sign of a chemical reaction?
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Metals are generally poor conductors of heat and electricity.
Metals are generally poor conductors of heat and electricity.
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What do metals typically form when they react with oxygen?
What do metals typically form when they react with oxygen?
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The formation of a solid when two liquids mix is called a ______.
The formation of a solid when two liquids mix is called a ______.
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Match the chemical property of metals with its description:
Match the chemical property of metals with its description:
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Which of the following is a characteristic of metals?
Which of the following is a characteristic of metals?
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Once a metal is reacted with oxygen, it can easily be reversed.
Once a metal is reacted with oxygen, it can easily be reversed.
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What type of reaction involves a metal replacing another in a compound?
What type of reaction involves a metal replacing another in a compound?
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Metals that react readily to form compounds are called ______ metals.
Metals that react readily to form compounds are called ______ metals.
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Study Notes
Chemical Reactions
- Chemical reactions involve reactants forming products.
- Reactant amounts decrease during the reaction, while product amounts increase.
- Signs of a chemical reaction include:
- Color change
- Temperature change (heat release/absorption)
- Gas production (bubbles/fizz)
- Formation of a precipitate (solid formation in a liquid)
- Change in odor
- Light or sound production
- Irreversibility (e.g., burning a match)
Properties of Metals
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Physical Properties:
- Strong and malleable (can be hammered into shapes)
- Ductile (can be stretched into wires)
- Sonorous (produce a ringing sound when struck)
- Shiny when polished
- Conductors of electricity and heat
- High melting and boiling points (most are solid at room temperature - mercury is an exception).
- High density (feel heavy)
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Chemical Properties:
- React with oxygen to form oxides
- Form positive ions, losing electrons
Metal Reactivity
- Reactive metals readily form compounds.
- Displacement reactions occur when a more reactive metal replaces a less reactive metal in a compound.
- Metal reactions with water or oxygen are highly variable
- Example: Potassium explodes, sodium fizzes, magnesium glows.
- Example: Iron rusts, magnesium burns with a bright white flame
- Exothermic reactions are those that release heat.
- Reactivity series: Metals are ranked based on their reactivity. Reactivity influences displacement reactions with acids/other metal reactions, and determines extraction methods.
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