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CSEE (Form 4) Classification of Matter — practice questions

Explore 7 free Classification of Matter questions in CSEE (Form 4) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Classification of Matter questions and exercises with answers

Showing questions 1–7 of 7.

Two substances are combined but stay unbonded and no reaction happens between them. What has been made?Read the answer and worked solution →Salt is stirred into water until nothing separate can be seen anywhere in the glass. What kind of mixture is this?Read the answer and worked solution →What must always be true of the elements inside any compound?Read the answer and worked solution →A sample of a metalloid is heated. What happens to its ability to conduct an electric current?Read the answer and worked solution →Match each term to its meaningRead the answer and worked solution →Tap the one that does not belongRead the answer and worked solution →Line up three of one familyRead the answer and worked solution →

Worked practice questions

Two substances are combined but stay unbonded and no reaction happens between them. What has been made?

  1. A mixture
  2. A compound
  3. An element
  4. A molecule
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Correct answer: A. A mixture

1. Sand stirred into water is a good picture of what is happening here. 2. A mixture is a combination of two or more substances that are not bonded to each other, with no chemical reaction between them. 3. In a compound the elements are joined in a fixed ratio, which is not the case here. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 2: Classification of matter_

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Salt is stirred into water until nothing separate can be seen anywhere in the glass. What kind of mixture is this?

  1. Heterogeneous
  2. Homogeneous
  3. An emulsion
  4. A suspension
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Correct answer: B. Homogeneous

1. Mixtures split into two families depending on whether the parts can be told apart. 2. A homogeneous mixture is uniform and its different components cannot be seen. 3. Soil is the opposite case, since pebbles, sand and plant matter can all be picked out. 4. That opposite case is called a heterogeneous mixture. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 2: Classification of matter_

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What must always be true of the elements inside any compound?

  1. They can be mixed in any ratio
  2. They keep all their own properties
  3. They are joined in a fixed ratio
  4. They can be split by filtering
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Correct answer: C. They are joined in a fixed ratio

1. A compound is a substance made of two or more different elements joined together in a fixed ratio. 2. Water always has two hydrogen atoms for every one oxygen atom, no matter where the sample came from. 3. That fixed ratio is what the chemical formula records. 4. Being able to mix in any ratio and being separable by filtering both describe mixtures instead. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 2: Classification of matter_

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More Chemistry topics

Organic ChemistryAlcohols Phenols EthersAldehydes KetonesAlkenesChemical BondingChemical Bonding and Molecular StructureChemical EquilibriumClassification of Elements