Chemical reactions: precipitation
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Waxaan qeexi karaa waxa dhacaya inta lagu jiro falcelinnada roobabka, oo aan u qori karaa isla'egyo kiimikaad si aan u muujiyo kuwaas.
Introduction
In this lesson: I can describe what happens during precipitation reactions, and write chemical equations to show these. Precipitation reactions occur when two solutions combine to form an insoluble solid. The appearance of a precipitate is evidence that a chemical reaction has occurred.
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Quizzes
1. What does the arrow (→) in a chemical equation represent?
- Equals
- Reacts with
- Correct answer:Changes into
- Is less than
2. True or false? When a substance dissolves in ethanol it will form an aqueous solution.
- True
- Correct answer:False
3. Which of the following is true about solubility?
- All solids dissolve in water.
- Only gases dissolve in water.
- Correct answer:Some substances dissolve in water, and some do not.
- All liquids are insoluble.
4. In chemistry, what does "precipitation" refer to?
- Correct answer:The formation of a solid from a solution.
- Rain, snow, sleet, or hail that falls to the ground.
- The process of a liquid turning into a gas.
- The solidification of molten rock.
1. What is a precipitate?
- A substance that dissolves in water.
- A gas produced in a chemical reaction.
- A liquid that evaporates quickly.
- Correct answer:An insoluble solid formed when two solutions react together.
2. Why are precipitation reactions used in qualitative analysis?
- To measure the quantity of a substance.
- Correct answer:To confirm the presence of a substance.
- To increase the temperature of a solution.
- To dissolve solids in a solution.
3. Which term describes a chemical test that confirms the presence of a substance without measuring its quantity?
- Quantitative analysis
- Spectroscopic analysis
- Correct answer:Qualitative analysis
- Precipitation analysis
What pupils see
The same lesson as a pupil sees it. You can set any section as work on its own.
- IntroductionPrepare
- Starter quizActivate · 4 questions
- Lesson videoLearn
- Exit quizCheck · 3 questions