Karteikarten
Compounds
Karten in diesem Stapel (15)
- 1What is a compound?A compound is a substance made up of atoms of two or more elements. The atoms are strongly joined together
- 2How are the properties of a compound relative to the properties of the elements it is made up of?The properties of a compound are DIFFERENT to the properties of the elements it is made up of
- 3What is a molecule?A molecule is a group of two or more ATOMS strongly joined together
- 4What does a hydrogen molecule consist of?Two hydrogen ATOMS strongly joined together
- 5What does an oxygen molecule consists of?Two oxygen ATOMS strongly joined together
- 6What does a water molecule consist of?A water molecule consists of one oxygen ATOM joined to to two hydrogen ATOMS :\[H_2O\]
- 7Why is water a compound?Water exists as molecules. A compound is a substance made up of atoms of two or more elements. Water molecules are made up of atoms of two elements (two hydrogen atoms joined to one oxygen atom) therefore water is a compound
- 8Why does water have different properties to hydrogen and oxygen?Because water molecules are different to hydrogen molecules and oxygen molecules ie water has a higher boiling point than hydrogen
- 9Why does water have a higher boiling point than hydrogen?In liquid hydrogen weak forces hold molecules close to each other.
In liquid water stronger forces hold molecules close to each other.
It therefore takes more energy to separate water molecules from each other than hydrogen.
Water has a high boiling point than hydrogen - 10Why is water different to its elements?A compound has different properties to the elements in it
- 11What is salt?Salt, scientifically known as sodium chloride, is a compound containing atoms of two elements, sodium and chlorine
- 12If sodium is a shiny metal that fizzes in water and chlorine is a smelly green poisonous gas, why doesn't salt smell or poison you or fizz in your mouth?In salt, the atoms of sodium and chlorine are not just mixed up, they are joined together to make a compound known as sodium chloride.
The compound has different properties to the elements in it. - 13Describe one difference in properties between sodium chloride and sodium?Sodium chloride (salt) is a white edible used to season food whereas sodium is a shiny metal which fizzes in water
- 14Describe a compound in your mouth which demonstrates that a compound has different properties to the elements in it?Tooth enamel is a compound of calcium (a shiny metal that fizzes in water), phosphorus (a poisonous solid that catches fire easily) and oxygen (a gas that helps things burn)
- 15Suggest an explanation for this boiling point data: \[Oxygen = -183\,^{\circ}C\]\[Water = 100\,^{\circ}C\]Considerably stronger forces hold the molecules close together in water than they do in oxygen, therefore, it takes more energy to separate water molecules from each other than oxygen molecules from each other, therefore, water has a considerably higher boiling point than oxygen
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- Chemistry (2.3 Compounds) Karteikarten am Compounds, erstellt von Enness am 03/04/2015.
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- Enness
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