What happens to bonds during a chemical reaction?
Bonds between reactant molecules break and new bonds form between product molecules.
What is produced by a chemical reaction?
Substances with different properties from the reactants.
Which six signs can indicate a chemical reaction?
Color change, gas evolution, precipitate formation, temperature change, heat and light emission, or odor change.
Why is burning magnesium in air a chemical reaction?
Because magnesium forms magnesium oxide with different properties.
What is a synthesis reaction?
Two or more substances combine to form one new compound.
What is the chemical equation for copper reacting with oxygen when heated?
What forms on copper's surface when it reacts with oxygen when heated?
Black copper oxide forms on its surface.
How does the reactivity of magnesium, iron, and copper compare in oxygen reactions?
Magnesium is more reactive than iron, which is more reactive than copper.
What is a thermal decomposition reaction?
One compound breaks down into simpler substances by heat or light.
What happens when red mercury oxide is heated?
It decomposes into liquid mercury and oxygen gas.
What are the products when calcium carbonate is heated?
Calcium oxide and carbon dioxide gas.
What happens in a single substitution reaction?
One element replaces another in a compound.
What is the chemical equation for magnesium replacing hydrogen in hydrochloric acid?
Which metal is more reactive with dilute hydrochloric acid: zinc or copper?
Zinc is more reactive than copper.
What does the chemical reactivity series arrange?
Metals in descending order of chemical reactivity.
Which metals can replace hydrogen from dilute acids according to the reactivity series?
Metals above hydrogen can replace it and release hydrogen gas.
Name the metal that comes immediately before hydrogen in the reactivity series.
Lead comes immediately before hydrogen.
Why does aluminum not react immediately with dilute hydrochloric acid?
Because a protective aluminum oxide layer blocks the reaction initially.
Which metals react with water and replace hydrogen from water molecules?
Highly reactive metals at the top of the reactivity series.
What gas does sodium release when reacting strongly with water?
Hydrogen gas.
Why is sand used to extinguish a sodium fire?
Because water can intensify the reaction.
How does magnesium react with cold versus hot water?
It reacts very slowly with cold water but readily with hot water.
What are the products when magnesium reacts with hot water?
Hydrogen gas and a white suspension of magnesium hydroxide.
Which metals react rapidly with cold water?
Highly reactive metals like sodium, potassium, and calcium.
Which metals react with hot water or steam but not cold water?
Moderately reactive metals like magnesium, zinc, and iron.
Which metals do not react with water under normal conditions?
Less reactive metals such as copper, silver, and gold.
What can a more reactive metal do in a salt solution?
It can replace a less reactive metal from its salt solution.
Write the chemical equation for zinc displacing copper from copper sulfate.
What happens to the blue color when zinc is immersed in copper sulfate solution?
The blue color gradually disappears.
What forms on the zinc plate during the copper sulfate reaction?
Reddish-brown copper is deposited on the zinc plate.
What does the zinc and copper sulfate reaction demonstrate about zinc?
Zinc is more reactive than copper and can replace copper from its salt.
Test your knowledge with 16 questions on Types of Chemical Reactions.
1. What distinguishes a chemical reaction from a physical change?
2. Which observation is one possible sign that a chemical reaction has occurred?
Review the complete course in the study sheet for Types of Chemical Reactions.
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