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24 Cards in this Set
- Front
- Back
What is an element? |
Element is a substance that is made of only one sort of atom |
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What is the nucleus of an atom made up of? |
Protons and neutrons |
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What is the nucleus of an atom surrounded by? |
Electrons |
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Protons have what type of charge? |
a positive electric charge |
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What type of charge does an electron have? |
A negative charge |
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The number of electrons is equal, more or less than the number of protons in the nucleus? |
Equal- so they have no electrical charge |
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Group 1 elements are alkali metals because of what? |
They form alkaline compounds |
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What is the word formula for group 1 elements reacting with water? |
Metal+ water--> metal hydroxide+ hydrogen |
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Lithium burns with what colour flame? |
Red |
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Solium burns with what colour flame? |
Yellow-orange |
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Potassium burns with what colour flame? |
Lilac |
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Group 0 are called what because of what reason? |
Noble gases because they are unreactive |
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What do elements in the same period have? |
Occupied energy levels or shells |
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What do elements in a group have the same number of? |
Electrons in the highest occupied energy level or outer shell |
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In ionic binding what happens to metal atoms? |
They lose electrons to form positive ions |
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What happens to non metal atoms in ionic bonding? |
They gain electrons to form negatively charged ions |
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How many oxygens does CO2 contain? |
2 |
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What is an ionic bond? |
A force of Attraction between oppositely charged ions |
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Limestone is mainly made from what chemical? |
Calcium carbonate |
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Advantages of limestone |
Valuable natural resource Used to make glass and concrete Provides employment opportunity that support local economy
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Disadvantages of limestone |
Visible from long distances May perminatly disfigure the local environment Creates nois and heavy traffic |
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What is distillation? |
A process used for separating a pure liquid from a mixture of liquids |
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What is the sequence in distillation? |
Heating,evaporation, cooling, condensing |
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Are alkenes saturated or unsaturated? |
Saturated |