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types of matter

7-3 Ch 4 - Types of Matter

Atom Smallest unit of matter
Carbon, oxygen, iron, gold, silver, helium, neon, sodium Common elements- examples
Compound atoms of two or more elements chemically joined
Element has all identical atoms
Mixture multiple elements and/or compounds physically not chemically joined
Molecule A single unit/group of a substance (elements or compounds) chemically joined
saltwater, air, metal alloys Mixture example(s)
CO2, H2O, glucose, NaCl (salt) Examples of compounds
How do you count atoms in a compound? Add up the numbers, remembering that if the symbol doesn't have a number, then it is a one.
How many atoms are in CaCO3? 5: one calcium, one carbon and three oxygen
How many elements are in H2SO4? 3: H, S and O --> each element symbol starts with a capital letter.
How many atoms are in H2SO4? 7: two hydrogen, one sulfur and 4 oxygen
How many elements are in CaCO3? 3: Ca, C and O --> each element symbol starts with a capital letter
Can you recognize pictures of elements, compounds and mixtures? I hope so - you need to do 5-7 pics.
Created by: jenhaugen01