Review Concepts & Practice Problems from CHEM 161

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36 Terms

1

What’s a Molecule?

group of atoms with no charge

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2

What’s a Compound?

make up of 2 or more different atoms held 2gether by bonds

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3

What are Ions?

Atoms with a charge

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4

What is the Chemical Law Mass Conservation?

mass is conserved in a chem reaction

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5

What is Definite proportions law?

Compound always contain same proportion of their components

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6

What is the Constant composition law?

same element commotion no matter the source it’s come from.

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7

What are intensive properties & some examples?

independent of the amount of a substance

  • Color, odor, malleability & density

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8

What are extensive properties & some examples?

Dependent on the amount of substance

  • mass

  • volume

  • length

  • size

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9

What are examples of Physical Properties?

  • Density

  • Color

  • Metal

  • Squid & room temp

  • Dissolving

  • Precipitation

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10

What are some examples of Chemical Properties?

  • Reactions that occur with O2 or H2O

  • Rust

  • Corroding

  • Burning

  • Decomposing

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11

What makes something a mixture?

can be separated by physical means

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12

Homogenous VS. Heterogenous Mixture?

mixed in a uniformed fashion VS. mixed in a un-uniformed fashion

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13
<p>From left to right what would the states of matter be?</p>

From left to right what would the states of matter be?

Solid —> Liquid —> Gas

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14

Precision VS Accuracy

  • Closeness of taken/measured values

VS.

  • Closeness to a true definite value

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15

What makes the Bolded #s sig figs & what’s the last s.f.?

129

  • All Non-zero digits

  • 9

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16

What makes the Bolded #s sig figs & what’s the last s.f.?

5007

  • Zeros between non-zero digits

  • 7

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17

What makes the Bolded #s sig figs & what’s the last s.f.?

1000.0

  • Trailing zeros that contain a decimal point

  • 0 (after the point)

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18

What makes the Bolded #s sig figs & what’s the last s.f.?

0.000470

  • zeros infant of non-zero digits don’t count & there is a zero after a decimal point that would count

  • 0

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19

What makes the Bolded #s sig figs & what’s the last s.f.?

0.0025

  • zeros before the non-zero digits not counting. Starting of non-zero digits.

  • 5

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20

What makes the Bolded #s sig figs & what’s the last s.f.?

100

  • trailing zeros in a number that isn’t a decimal

  • 1

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21

What makes the Bolded #s sig figs & what’s the last s.f.?

9.8 × 10^6

  • 10 & exponent in scientific notation do not count as sig.figs

  • .8

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22

What is the # of Sig figs in each #?

  1. 250.7

  2. 0.00077

  3. 4.7 × 10^-5

  4. 500.0

  5. 0.034000

  6. 220

  7. 220.

  1. 4

  2. 2

  3. 2

  4. 4

  5. 5

  6. 2

  7. 3

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23

What is mega a multiple for & it’s symbol?

10 ^ 6

  • M

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24

What is kilo a multiple for & it’s symbol?

10³

  • k

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25

What is deci a multiple for & it’s symbol?

10^-1

  • d

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26

What is centi a multiple for & it’s symbol?

10^-2

  • c

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27

What is milli a multiple for & it’s symbol?

10^- 3

  • c

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28

What is micro a multiple for & it’s symbol?

10^-6

  • μ

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29

What is nano a multiple for & it’s symbol?

10^-9

  • n

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30

What is pico a multiple for & it’s symbol?

10^-12

  • p

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31

What is bigger a nanogram or gram?

gram

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32

how many ng are in 8.9?

8.9 × 10^-9 ng

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33

how many km is 1.6 m?

1.6×10³km

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34

as proton number increases what will be required to get a stable nucleus?

more neutrons

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35

one mole of atoms is equivalent to?

the molar mass

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36

What is Molarity? or M

mol of solute/ liter of solution

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