8 Science 1st SEM Flashcards Preview

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Flashcards in 8 Science 1st SEM Deck (63):
0

Aquifer

A body of rock or sediment in the water

1

Well

Pumps water out of zone of aeration

2

Spring

Water that flows through cap rock

3

Water table

Dividing both zones

Zone of aeration
Zone of saturation

4

Zone of aeration

Top zone in an aquifer

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Zone of saturation

Below water table and zone of aeration

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Watershed

Drainage basin

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Water system

Many waters leading into a big body of water

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Permeable surfaces

Lets water pass through

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Impermeable

Does NOT let water pass through

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Condensation

Water going up into the atmosphere

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Evaporation

Liquid to gas

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Percolation

Water in roots

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What powers the water cycle?

Energy from sun

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Some water quality measures

Wells and dry wells

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Surface currents in the ocean

Wind and sun

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Solid

Define shape and volume

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Liquid

Has no define shape

Has define shape

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Gas

No define shape or volume

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Compound

A pure substance

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Physical properties/changes

Melting point, density, color

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Chemical properties/change

Reacts w acid

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Density

Ratio of a mass of substance to volume of a substance

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Boiling point

Liquid to a vapor

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Melting point

Solid becomes a liquid

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Freezing point

At which a substance has tight monetary molecules

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Condensation point

Boiling

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Weight vs mass

Mass is not a measure of weight, it is the measure of how much something has

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Endothermic

Heat entering a substance

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Exothermic

Heat exiting

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Equation for density

Mass divided by
Volume equals Density

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Physical changes are.....

STATE changes

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Chemical changes are.....

Reactivity

33

Atom

Smallest unit of life

Building blocks of life

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Nucleus

Center part of atom

35

Proton

Positive charge

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Neutron

No charge

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Electron

Negative charge

38

Electron cloud

Region around nucleus and holds the electrons

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Mass number

Sum of protons and and neutrons in nucleus

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Atomic number

Number of only protons in nucleus

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Ion

When electrons and protons are not equal

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Isotope

Same number of protons not NEUTRONS

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Atomic mass

Mass media f ate m expressed in atomic units

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Metals

Conducts heat and electricity WELL

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Non metals

Conducts heat and electricity POOR

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Period

Horizontal row on periodic table

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Group

Vertical group on periodic table

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Covalent bond

Atoms share pair of electrons

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Ionic bond

Elections are transferred

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Valence electron

Determines the atoms properties

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Where is the atomic number located on and table square?

Top

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Location of atomic mass of table square

Very bottom

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Lewis dot structure

Dots around the

EXAMPLE: H and dots around it

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Law of conservation of mass

Mass cannot be created nor destroyed in a chemical of physical change.

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Reactants

Start of a reaction

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Products

Ending part of a reaction

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Chemical reaction

One or more substances creates another substance

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Chemical formula

Chemical numbers and symbols to represent a substance

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Exothermic reaction

Heat is RELEASED

EXITS

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Endothermic reaction

Requires heat

Heat enters

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Coefficient

Big number before the element

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Subscript

Small number after element


Looks like a power