20315817
Description
Flashcards by Smitha Bhabal, updated more than 1 year ago
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Created by Smitha Bhabal
almost 5 years ago
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| Question | Answer |
| Define an element? | Elements consist of one type of atom only. |
| Describe the structure of an element. | Atoms are solidly packeted togther in solids but there is only one type of atoms there. |
| Define the turm compound. | Compounds are chemically bonded together. |
| Carbon + oxygen ------ | ----- Carbon dioxide |
| Two oxygens molecules are red. One carbon molecule is black. How would you draw this? | RED+BLACK+RED |
| Ca(+2), NO (-3) What is the chemical formula of calcium nitrate? | Ca(NO3)2 The number have to be subscript. |
| Relative atomic mass (Mr values) Percentage mass of an element in a compound | Percentage mass of an element in a compund= Ar x number of atoms of that element divided by Mr of a compound x 100 |
| Mr values of MgCl (2) Numbers have to be in subscript | Mg + (2 x Cl)= 24 + (2 x 35.5) = 95 So Mr values of MgCl (2) Number 2 in subscript Mr = 95 |
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