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Unit 01: Elements, Compounds, and Mixtures

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Unit 01: Elements, Compounds, and Mixtures

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Questions and Answers

What is the primary characteristic of an element?

It is composed of two or more different elements

It is a material composed of two or more simpler substances

It can be broken down into other substances by chemical reactions

It is a substance that cannot be broken down into other substances by chemical reactions (correct)

Which separation technique involves the conversion of a liquid into vapour that is subsequently condensed back to liquid form?

Crystallisation

Evaporation

Distillation (correct)

Filtration

What is the process of separating components of a liquid, especially ink?

Solubility

Chromatography (correct)

Filtration

Crystallisation

What is the term for the solidification of a liquid substance into a highly structured solid?

Crystallisation Signup and view all the answers

What is the primary factor that affects the solubility of a substance?

All of the above Signup and view all the answers

What is the process of separating an insoluble solid from a liquid through filter paper?

Filtration Signup and view all the answers

What is the process of particles moving from an area of high concentration to an area of low concentration?

Diffusion Signup and view all the answers

What is the term for the average mass of all different isotopes of an element?

Relative atomic mass Signup and view all the answers

What is the result of the formation of a covalent bond between two atoms?

A shared pair of electrons Signup and view all the answers

What is the name of the process in which a solid changes directly into a gas?

Sublimation Signup and view all the answers

What is the outermost energy level of an atom called?

Valence shell Signup and view all the answers

What is the number of electrons required by Hydrogen and Helium to achieve a stable outer shell configuration?

2 Signup and view all the answers