UB CHE 101 - Chemistry Chapter 1 (2 pages)

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Chemistry Chapter 1



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Chemistry Chapter 1

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Pages:
2
School:
University at Buffalo, The State University of New York
Course:
Che 101 - General Chemistry Lecture
General Chemistry Lecture Documents

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Chemistry Chapter 1 Pure substances have distinct properties and a fixed composition elements made of 1 individual atom can t decompose into anything smaller o Few elements exist as molecules Diatomic molecules are 2 of the same atom and only 7 exist All are gases Mixture is 2 or more substances o Homogeneous is uniform throughout aka solutions o Heterogeneous is not uniform throughout Significant figures Always count going from left to right Even with decimals the zeros in front of a number are not significant Zeros at the end and to the right of a decimal are significant 85 00 4 sigs Zeros to the right of a number are only significant in the case that they have a decimal If not they are not significant Don t count the 10s for exponents Ex 4390000 to 3 sig figs 4 40 10 7 You round the third number if 3 sig figs o When multiplying and dividing the sig fig is limited by the lowest number of sig figs o When adding and subtracting you use the number of sig figs to the most right of the decimal Metric Prefixes o When finding volumes m 3 or cm 3 for liquids mL o Box lwh o Sphere 4 3 pi r 3 o o Cone h pi r 2 Note 1 mL is equal to 1 cm 3



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