Physical Science Flashcards

1
Q

what are the three changes in matter ?

A

boiling, condensation, evaporation

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2
Q

what are the two different types of mixtures?

A

homogeneous and heterogeneous

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3
Q

what does homogeneous mixture mean?

A

you can not see the different parts of the mixture. ex, coffee, creamer

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4
Q

what does heterogeneous mixture mean?

A

you can see the different parts of the mixture. ex, chicken noodle soup

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5
Q

values less than 7 on a ph scale are…

A

acidic

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6
Q

values greater than 7 on a ph scale are…

A

alkaline (base)

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7
Q

what is the smallest part of an element?

A

atom

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8
Q

what are electrons?

A

negatively charged particles

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9
Q

what are nuetrons? where are they located?

A

neutrally charged particles that are located in the atoms nucleus

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10
Q

what are protons? where are they located

A

positively charged particles that are located in the atoms nucleus.

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11
Q

what is an atomic number?

A

how an element is identified. it’s the number of protons in the nuclei

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12
Q

do groups on a periodic table go vertically or horizontal?

A

vertical

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13
Q

what is the smallest particle in a chemical element or compound?

A

molecule

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14
Q

what are ions?

A

charged elements or molecules that have lost or gained one or more electrons

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15
Q

what is an isotope?

A

two or more forms of the same element that have the same number of protons but different neutrons

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16
Q

what is density?

A

the amount of matter an object has to its volume

17
Q

what is kinetic energy?

A

object is in motion

18
Q

what are the different types of energy?

A

mechanical, electrical, chemical and thermal

19
Q

what does mechanical energy do?

A

objects in motion

20
Q

what does electrical energy do?

A

moves through wires

21
Q

what does chemical energy do?

A

reaarangment of moecular structure

22
Q

what does thermal energy do?

A

moving particles by heat

23
Q

what is heat transfer?

A

the exchange of thermal energy between physical systems

24
Q

what are the three different types of heat transfer?

A

convection, conduction, and radiation

25
what is convection? think of convection oven
transfer of heat by the movement of warmed matter
26
what is conduction?
transfer of hear from particle to particle
27
what is radiation heat?
transfer of hear from elctromagnetic waves
28
how many different types of circuits are there?
2
29
what is a series circuit?
components are arranged end to end
30
what is a parallel circuit?
a circuit with branches that allows multiple applications to happen at one time
31
what are good conductors for electricity ?
wire, metal, water
32
cloud-to-ground lightning occurs between what?
opposite charges between thunderstorm cloud or between cloud and ground
33
what does dependent variable mean?
what is being measured
34
what does independent variable mean?
what is being tested, what is being manipulated