unit 4 Flashcards

1
Q

matter

A

occupies space and contains mass

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2
Q

homogenous mixture

A

visibly indistinguishable parts (batter)

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3
Q

heterogenous mixture

A

visibly distinguishable parts

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4
Q

pure substance

A

substance with one constant composition

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5
Q

compound

A

substance with constant composition that can be broken down into elements by chemical process.
- water
- table salt

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6
Q

elements

A

substance that cannot be decomposed into simpler substances by physical or chemical means
- oxygen
- hydrogen

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7
Q

physical change

A

substance changes without changing the composition
-usually reversible

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8
Q

chemical change

A

substance changed- breaking or creation of bonds
-produce new substances with new properties

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9
Q

evidence of chemical change

A
  • production of precipitate
  • color change
  • change in energy (light, temp, sound)
  • gas production (bubbles/cloudiness)
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10
Q

reaction types

A

-synthesis
-decomposition
- combustion
- single replacement
- double replacement

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11
Q

synthesis reaction

A

2 or more substance combine into single substance

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12
Q

decomposition reaction

A

1 compound splits into 2 simple substances

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13
Q

single replacement

A

one element replaces a similar element in a compound.

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14
Q

double replacement

A

positive and negative ions of two ionic compound exchange places to form two new compounds

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15
Q

combustion

A

burning; chem reaction, substance reacts quickly with O2 releasing energy in form of light and heat.

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16
Q

law of conservation of mass

A

matter cannot be created or destroyed, only transformed

17
Q

diatomic

A

consist of 2 atoms
-O2
-F2
-H2
-Br2
- I2
- N2
- Cl2

18
Q

net ionic equations

A

only show particles that change in the reaction cancelling out the spectator ions

19
Q

stoichiometry

A

conversions that involve mole ratios from a balanced chemical equation

20
Q

percent yield

A

actual yield/theoretical yield *100

21
Q

acid base titration

A

changes color when close to 7 pH

22
Q

redox titrations

A

color change produced when oxidation state of a metal ion in the reaction changes.

23
Q

precipitation titration

A

titrant reacts with ions in analyte, precipitation can occur. formation of precipitation or color change can signal end point