Presentation on theme: "Unit A: 1.3 Matter combines to form different substances"— Presentation transcript:
1 Unit A: 1.3 Matter combines to form different substances How pure matter and mixed matter are differentHow atoms and elements are relatedHow atoms form compounds
2 Mix 1 teaspoon of each water and cornstarch. Observe. Can you still see each substance? How different?Oobleck is formed! NEW substance
3 Matter: Pure or MixedEven drinking water is not pure: minerals dissolved in and chemicals added to itPure: if a substance contains only a single type of atom (such as gold) OR a single combination of atoms bonded together (such as water)
4 ElementContains only a single type of atom – cannot be separated into other substancesEx: silver, oxygen, hydrogen, helium, etc
5 Diamond and graphite are both made of Carbon Diamond and graphite are both made of Carbon. The individual atoms have the same properties, but are in different arrangement giving the substance very different properties
6 Compounds Two or more different types of atoms bonded together Water, carbon dioxide, table saltIndividual elements can have very different properties compared to the compound they formBreak down a compound into smallest parts that are still that substance, individual atoms or elements?No!Break down a pure element into smallest parts that are still that substance, atoms of that element?Yes!If you break a compound into the parts that compose it?Atoms of the elements that compose it (ex: NaCl)
7 Mixtures Mix of different substances Sea water: contains water, salt, other mineralsBlood: cells and plasmaPlasma: water, sugar, fat, protein, salts, mineralsCombo of different substance that remain their individual substances and can be separated physically.Will not always contain the same amount of the various substancesThink fruit salad!
8 Compounds vs Mixtures Mixtures Compounds substances remain the same new substance formed, atoms bond togethercan be separated by physical meansseparated by breaking the bonds between atomsProportion of diff. substances can vary-depends on where you sample (unless Homogeneous)Proportions of diff. substance are fixed-any sample yields same type and number of atoms
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