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Science > 1st parcial exam 9th > Flashcards

1st parcial exam 9th Flashcards

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Biology 101 flashcards
1
Q

A substance made out of two or more simpler substances that can be Brocken up to simpler ones

A

Compound

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2
Q

There 2 types of Compounds

A

heterogenous and homogenous

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3
Q

They tend to have remains of their original substance

A

Mixtures

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4
Q

Mixture can be classifies as based on their particles

A

Suspensions, solution or colloid

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5
Q

What is a suspension

A

heterogenous mixture with layers that separate over time

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6
Q

What is a colloid

A

It has particles in intermediate size

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7
Q

Solution

A

something that dissovlves

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8
Q

What is a physical property

A

a characteristic that can be observed or measured

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9
Q

Types of physical properties

A

Viscosity
conductivity
malleability
melting point & boiling point
density

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10
Q

Common separations methos

A

Distillation and filtration

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11
Q

What is filtrations

A

procces to separate the particles

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12
Q

what is distillation

A

process to separate the substances in a solution

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13
Q

When does a physical change occur

A

when some properties change

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14
Q

what is a chemical property

A

change in the composition of matter

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15
Q

What is flammability

A

how it can burn in the Prescence of air

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16
Q

the main gases in the air

A

nitrogen and oxygen

17
Q

what is a chemical change

A

change i color
production of gas
and formation of precipitation

18
Q

materials can be classifies as

A

solids liquids and gases

19
Q

what is a solid

A

a material that has a definite shape

20
Q

What is a liquid

A

the same shape as its contaner

21
Q

What is gas

A

It has neither definite shape nor volume

22
Q

what is a phase change

A

a substance changes from one state of matter to another

23
Q

Common phase changes

A

Evaporation , melting, freezing , deposititon, condesation, and sublimination

24
Q

what happens during a phase change

A

energy is transfered between a substance to its surroundings

25
Q

Types of changes

A

ENDOTHERMIC:absorbs energy

EXOTHERMIC:releases energy

26
Q

Who was John dalton

A

He was an english man from england 1766 investigating atoms coming up with a theory
His theory being that all matter i composed of individual atoms non divisible

27
Q

Who was Ernest rutherford

A

Ernest Rutherford discovered that uranium emits fast-moving particles
that have a positive charge. According to Rutherford’s model, all of an atom’s
positive charge is concentrated in its nucleus.
found a new particle
protons electrons and neutrons

28
Q

what is a proton

A

positevly charged subatomic particle

29
Q

what is a neutron

A

neutral subatomic particle

30
Q

What is an electron

A

negative charged subatomic particle

31
Q

atoms consist of

A

an extremely small, positively charged nucleus surrounded by a cloud of negatively charged electrons.

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