Flashcards
Chemistry FLASHCARDS- UNIT ONE TEST
Cards in this deck (8)
- 1Define an element?Elements consist of one type of atom only.
- 2Describe the structure of an element.Atoms are solidly packeted togther in solids but there is only one type of atoms there.
- 3Define the turm compound.Compounds are chemically bonded together.
- 4Carbon + oxygen ----------- Carbon dioxide
- 5Two oxygens molecules are red. One carbon molecule is black. How would you draw this?RED+BLACK+RED
- 6Ca(+2), NO (-3) What is the chemical formula of calcium nitrate?Ca(NO3)2
The number have to be subscript. - 7Relative atomic mass (Mr values) Percentage mass of an element in a compoundPercentage mass of an element in a compund= Ar x number of atoms of that element divided by Mr of a compound x 100
- 8Mr values of MgCl (2) Numbers have to be in subscriptMg + (2 x Cl)= 24 + (2 x 35.5) = 95
So Mr values of MgCl (2)
Number 2 in subscript
Mr = 95