Chem Mid-Term

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List four examples of physical changes

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1

List four examples of physical changes

Tearing Crushing boiling Melting

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2

List four examples of chemical changes.

Chemical reaction, burning, rusting and rotting

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3

Water is a?

Compound

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4

Saltwater is a?

Homogenous Mixture

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5

Pepperoni Pizza is a?

Hetrogenous Mixture

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6

Copper is a?

Element

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7

Distillation

a liquid is boiled to produce vapor that is then condensed again into a liquid

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8

Filtration

Process to separate solids from fluids by using a medium through which the fluid can pass, but the solids are retained

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9

Chromatography

Ese of paper, gel or clay to separate a mixture.

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10

3.56 X 10-3

0.003.56

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11

678, 000

6.78 X 10^5

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12

Density is?

Mass/Volume

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13

What do elements in the same group have in common?

They all have the same amount of valence electrons.

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14

Name the groups of the periodic table.

Alkali Metals, Alkaline Earth Metals, Transition metals, Halogens and noble gases

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15

What is the trend for first ionization energy across a row? Why does this trend occur? Which element has the highest ionization energy?

It increases going to right and decreases going down. it is the energy needed to remove electrons. Helium has the highest

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16

Which element has the highest electronegativity?

Fluorine

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17

Define cation

Positive end

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18

Define anion.

Negative end

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19

What does it mean when an ion is positive?

It has more protons than electrons

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20

What does it mean when an ion is negative?

It has more electrons than protons

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21

Name three characteristics of ionic bonds.

Crystalline solids, High melting points, dissolve in water METALS

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22

Name three characteristics of covalent bonds.

Soft solids, liquids or gases, low melting points, cant conduct electricity in solutions or when melted.

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23

Phosphorus pentachloride

PCl^5

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24

What does a Roman numeral mean when written in a name?

It represents the charge.

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25

Which gases are diatomic?

hydrogen (H), nitrogen (N), oxygen (O), fluorine (F), chlorine (Cl), bromine (Br), and iodine (I)

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26

What are the three main types of nuclear decay? Which one is non-particle?

Beta Decay

Alpha Decay

Gamma Decay- Non-particle

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27

Differentiate between a saturated hydrocarbon and an unsaturated hydrocarbon.

A saturated hydrocarbon has all single bonds

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28

Define isomer.

Same formula different structure

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29

Distinguish between aldehydes and ketones.

Aldehydes at least one hydrogen is attached to the carbonyl carbon. In ketones, there are two carbons bonded to the carbonyl carbon.

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30

Name and define the four biomolecules.

Carbohydrates, lipids, proteins, nucleic acids.

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