An element is a pure substance in which all atoms contain the same number of protons. Elements cannot be broken down into anything simpler.

A compound is formed when two or more elements are ______ combined. Unlike a mixture, a compound cannot be separated into its elements by ______ means.

A compound is formed when two or more elements are chemically combined. Unlike a mixture, a compound cannot be separated into its elements by physical means.

True or False? A mixture can be separated into its components by physical methods such as filtration or evaporation.

True. A mixture can be separated by physical methods because its components are not chemically combined.

Why can a mixture be separated by physical methods, but a compound cannot?

In a mixture, the substances are not chemically combined, so physical methods such as filtration or evaporation can separate them. In a compound, the elements are chemically combined and cannot be separated by physical means.

True or False? All elements consist of individual, separate atoms.

False. Some elements exist as molecules rather than individual atoms. For example, oxygen exists as O 2 and hydrogen as H 2 .

Sulfur powder and iron filings mixed together is an example of a ______ . Copper(II) sulfate (CuSO 4 ) is an example of a ______ .

Sulfur powder and iron filings mixed together is an example of a mixture . Copper(II) sulfate (CuSO 4 ) is an example of a compound .

True or False? An element contains atoms with different numbers of protons.

False. An element contains atoms that all have the same number of protons. Atoms with different numbers of protons belong to different elements.

A compound always has a ______ chemical formula, whereas a mixture can contain substances in ______ proportions.

A compound always has a fixed chemical formula, whereas a mixture can contain substances in any proportions.

O LevelChemistryCambridge (CIE)Flashcards2. Atoms, Elements & Compounds2.1 Elements, Compounds & Mixtures

2.1 Elements, Compounds & Mixtures (Cambridge (CIE) O Level Chemistry): Flashcards

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FrontElements, Compounds & Mixtures
Define an element.

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Cards in this collection (8)

Define an element.
An element is a pure substance in which all atoms contain the same number of protons. Elements cannot be broken down into anything simpler.
A compound is formed when two or more elements are ______ combined. Unlike a mixture, a compound cannot be separated into its elements by ______ means.
A compound is formed when two or more elements are chemically combined. Unlike a mixture, a compound cannot be separated into its elements by physical means.
True or False?
A mixture can be separated into its components by physical methods such as filtration or evaporation.
True.
A mixture can be separated by physical methods because its components are not chemically combined.
Why can a mixture be separated by physical methods, but a compound cannot?
In a mixture, the substances are not chemically combined, so physical methods such as filtration or evaporation can separate them.
In a compound, the elements are chemically combined and cannot be separated by physical means.
True or False?
All elements consist of individual, separate atoms.
False.
Some elements exist as molecules rather than individual atoms. For example, oxygen exists as O₂ and hydrogen as H₂.
Sulfur powder and iron filings mixed together is an example of a ______. Copper(II) sulfate (CuSO₄) is an example of a ______.
Sulfur powder and iron filings mixed together is an example of a mixture. Copper(II) sulfate (CuSO₄) is an example of a compound.
True or False?
An element contains atoms with different numbers of protons.
False.
An element contains atoms that all have the same number of protons. Atoms with different numbers of protons belong to different elements.
A compound always has a ______ chemical formula, whereas a mixture can contain substances in ______ proportions.
A compound always has a fixed chemical formula, whereas a mixture can contain substances in any proportions.

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