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Chemistry Class: Elements and Compounds

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Questions and Answers

What happens to the melting point of a substance when it is impure?

It has no effect on the boiling point.

It increases significantly.

It lowers and can have a range of temperatures. (correct)

It remains the same as the pure substance.

Which of the following best defines a pure substance?

A mix of two or more elements.

A single element or compound with no impurities. (correct)

A compound that can be easily separated.

Any liquid at room temperature.

What color flame is produced by the presence of sodium cations?

Blue-Green

Lilac

Yellow (correct)

Crimson

Which substance would exhibit a lilac flame color when heated?

<p>Potassium (K+)</p> Signup and view all the answers

Which of the following statements about compounds is true?

<p>They consist of two or more chemically combined elements.</p> Signup and view all the answers

Study Notes

Compounds and Elements

A compound is a substance formed when two or more elements are chemically combined.
An element is a substance that consists of one or more atoms and cannot be broken down into simpler substances by chemical means.
A pure substance is a single element or compound that is not mixed with any other substance.

Melting and Boiling Points

Melting point is the temperature at which a solid changes to a liquid.
Boiling point is the temperature at which a liquid changes to a gas.
A pure substance has a sharp melting point.
An impure substance has a melting point that has a range of values.

Colour of Flame and Cations

Different metal ions produce characteristic colours when heated in a flame.
Crimson flame is associated with Lithium (Li+).
Yellow flame is associated with Sodium (Na+).
Lilac flame is associated with Potassium (K+).
Brick Red flame is associated with Calcium (Ca2+).
Blue-Green flame is associated with Copper (Cu2+).

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Description

Test your knowledge on elements, compounds, and their properties in this chemistry quiz. Learn about melting and boiling points, as well as how different cations produce various flame colors. Dive into the basics of chemistry and solidify your understanding of pure substances.