An organic compound containing a hydroxyl group (OH) bound to a carbon atom.
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Chains of carbon atoms, especially in fats and oils, that contain two or more double bonds between carbon atoms.
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A salt or other compound containing a carbonate ion CO₃^2-.
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Any compound in which oxygen is combined with another element.
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A compound which dissolves in water to form a solution with a pH of less than 7.
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Discover the unique properties of silicon, which is found in many things from sand to computers.



Chemistry - Periodic Table - Learni

ng Points.

Silicon is

a metalloid element.

Silicon is found in...

An atom or group of atoms within a compound that reacts in a characteristic way, giving molecules particular chemical properties.
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A chemical formula is a way of writing the composition of a compound.
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A substance composed of more than one chemical element, whose atoms are held together by strong chemical bonds and are combined in a fixed ratio.
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A reaction in which a more reactive element replaces a less reactive element in a compound.
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A formula that shows the simplest whole number ratio of atoms in a compound.
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Adenosine Triphosphate, a molecule that acts as an energy store in all living cells.
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An electrolytic cell is a system that breaks down chemical compounds by electrolysis.
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The 17th century German chemist Johann Becher proposed that an element, phlogiston, was released when substances burned. He was wrong, and his incorrect theory led many early chemists to misunderstand the significance of some of their...

Some reactions take in energy and some release energy. Why? And what are some common examples of each type of reaction? Chemistry - Reactions - Learning Points. An energy change occurs when reactions take place. Exothermic reactions...

Potassium nitrate is a natural substance found in your food, or in an exploding firework. What makes it so versatile? Chemistry - Chemical Industries - Learning Points. Potassium nitrate preserves our food and is a component of...

The discovery and uses of reactive metals throughout history, and how their uses have defined the period in which they were discovered. Chemistry - Periodic Table - Learning Points. The reactivity series ranks the chemical reactivity of...

Transition metals are the largest group in the periodic table. Find out what similarities they share, and how we make use of these metals. Chemistry - Periodic Table - Learning Points. Transition metals are found as a block in the middle...

Two or more atoms held strongly together by covalent bonds. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...

We use distillation to remove the water from ink. The ink is heated in a conical flask with a delivery tube running to a beaker. The water has a lower boiling point and so it evaporates before the ink. The water condenses as it travels...

We extract copper metal from copper chloride solution using electrolysis. The electric current causes copper to form at one electrode and chlorine gas to form at the other. The presence of chlorine is tested using blue litmus paper....

We use mercury(II) chloride solution and potassium iodide to demonstrate a precipitation reaction. Saturated potassium iodide solution is placed on a magnetic stirrer and the speed is set so that a vortex is created. Mercury(II) chloride...

How metals and non-metals combine to form compounds with unique and very different properties. Chemistry - Atoms And Bonding - Learning Points. An electrically charged atom is called an ion. Ionic bonds are very strong. Ions are formed...

We examine the different properties of iron and sulfur when they are mixed and when they are chemically combined. When iron and sulfur are mixed they retain their individual properties. When they react chemically to form iron sulfide...