Chemistry FLASHCARDS- UNIT ONE TEST

Questão	Responda
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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