Starter quiz
- In chemistry, what distinguishes a compound from an element?
- Compounds can be broken down into simpler chemicals. ✓
- Compounds are always liquid at room temperature.
- Elements contain multiple types of atoms.
- Elements are always gases.
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- Order the states of matter from most to least freedom of movement:
- 1⇔gas
- 2⇔liquid
- 3⇔solid
- Which is only a characteristic of a chemical change (compared to a physical change)?
- change in state
- increase in temperature
- formation of a new substance ✓
- change in mass
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- What defines an element in chemistry?
- a mixture of compounds
- a substance with varying properties
- a substance made of one type of atom ✓
- any solid material
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- What property measures how much matter is in a substance?
- 'mass' ✓
- In chemistry, ______ chemicals refer to substances that only contain one type of fundamental unit, like an atom or molecule.
- 'pure' ✓
Exit quiz
- Match the following terms with their correct definitions.
- mixture⇔A material with two or more different substances physically combined. ✓
- separate⇔To extract and isolate a substance from a mixture. ✓
- formulation⇔A designed mixture with specific purpose for each component. ✓
- property⇔A feature or characteristic of a substance. ✓
- Which of these is a true statement about mixtures?
- Mixtures have fixed melting points.
- Components in a mixture lose their original properties.
- Mixtures can be separated by physical methods. ✓
- Mixtures are substances with uniform composition.
- Each component in a mixture forms new chemical bonds.
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- The melting point data of a substance can help distinguish a pure substance from a...
- 'mixture' ✓
- Which of the following is NOT a correct use of the term 'pure' in scientific context?
- pure water
- pure carbon dioxide
- pure air ✓
- pure gold
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- Order the following steps used in separating a mixture. Start by identifying the components.
- 1⇔Identification of the components.
- 2⇔Determining the best separation method.
- 3⇔Applying a physical separation method.
- 4⇔Collection of the separate components.
- In a mixture, the chemical ______ of each substance remains unchanged.
- 'properties' ✓
Worksheet
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Lesson Details
Key learning points
- A mixture consists of two or more elements and/or compounds, not chemically combined together.
- Chemical properties of each substance in a mixture remain unchanged.
- There are multiple physical processes for separating mixtures.
- Melting point data can be used to distinguish between pure substances and mixtures.
- A formulation is a designed mixture, with each component serving a specific purpose.
Common misconception
Pupils mistake common (everyday) usage of pure (e.g. pure orange juice) as being a pure substance when it is, in fact, a mixture.
'Everyday' usage refers to one source, whereas scientific usage refers to particle composition.
Keywords
Mixture - A mixture is a material that contains two or more different substances that can be physically separated.
Separate - In chemistry, to separate something is to extract and isolate a substance from a mixture.
Formulation - A formulation is a designed mixture, with each component serving a specific purpose in the desired product.
Property - A property is a feature or characteristic of a substance that can be used to classify it or describe how it behaves.
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