Science: Chapter 11 chemical changes
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9 Terms
Give three examples of physical changes.
Melting ice, boiling water and condensation.
What are four common signs that a chemical change has occurred?
Gas is produced, bubbles/fizzing occur, a colour change occurs, and a solid precipitate is formed.
What is a precipitate?
An insoluble solid formed during a chemical reaction.
What are three characteristics of a chemical change?
A new substance is formed, the change is usually irreversible, and the chemical composition changes.
What is a chemical change
A change in which one or more substances are converted into substances with different properties.
What is combustion?
A reaction that occurs when a substance burns in oxygen and releases heat and light.
How do you test for hydrogen gas?
Put a lighted splint near the gas; hydrogen produces a squeaky pop.
How do you test for oxygen gas?
Put a glowing splint into the gas; the splint relights.
How do you test for carbon dioxide?
Bubble the gas through limewater; the limewater turns milky.