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Science > Basic Definitions > Flashcards

Basic Definitions Flashcards

1
Q

What is: a hypothesis

A

The possible explanation of an observation

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2
Q

What is: the SI unit for time is :

A

Seconds

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3
Q

What is: the SI unit for mass

A

Kilograms

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4
Q

What is: the SI unit for length

A

Metres

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5
Q

What is the definition of: length

A

The distance between two points

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6
Q

What is the definition of: mass

A

The amount of matter an object contains

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7
Q

What is the definition of: area

A

The amount of surface that covers an object

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8
Q

What is the formula for calculating the area of a square?

A

Pi R squared

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9
Q

What is the definition of: volume

A

How much space/substance an object takes up

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10
Q

What is the error of meniscus?

A

Is when you read a liquid measurement and the liquid has curved so you read it wrong

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11
Q

How to avoid the error of meniscus?

A

Always read the bottom of the meniscus at eye level for any liquid

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12
Q

What is the definition of: temperature?

A

The measure of how hot or cold an object is

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13
Q

What is the definition of: matter

A

Anything that occupies space and has mass

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14
Q

What are the properties of solids?

A

-definite shape
- definite shape
-does not flow

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15
Q

What are the properties of liquid?

A
  • no definite shape
  • definite volume
    -does flow
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16
Q

What are the properties of gas?

A

-no definite shape
-no definite volume
-does flow

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17
Q

What is the definition of: melting point

A

The temperature at which a solid changes to a liquid

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18
Q

What is the definition of: evaporation

A

The changing of a liquid to a gas at the SURFACE of a liquid

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19
Q

What is the definition of: boiling

A

The changing of a liquid to a gas throughout the liquid

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20
Q

What is the definition of a cell

A

Cells are the smallest working unit in a living organism

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21
Q

What is the definition of: a cell organelle

A

The individual parts of a cell

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22
Q

What is an eyepiece?

A

To magnify and view the specimen

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23
Q

What is the focus wheel?

A

To roughly focus the image of the specimen

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24
Q

What is the stage?

A

To hold the specimen ( glass slide )

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25
What is the course focus wheel ?
To focus the specimen roughly
26
What is the : Objective lens?
To magnify the specimen
27
What is the light?
To see the specimen?
28
What are the seven characteristics of life?
- Nutrition - Movement - Respiration - Reproduction - Response - Growth - Excretion
29
What is the shape of a plant cell
Cuboid
30
What is the shape of an animal cell?
An oval
31
Name 6 safety rules in a lab
- Wear safety goggles -Don’t mess around with chemicals -Follow instructions carefully - No eating and drinking in the lab - Handle all equipment carefully
32
What is an experiment?
a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
33
What is a trundle wheel?
The trundle wheel is made up of a wheel (usually with the circumference of one metre), a handle which is attached to the axle of the wheel, and a device which "clicks" every time the wheel makes one complete turn.
34
What is an opisometer?
Opisometers are used to measure the length of curved lines.
35
What is a vernier callipers?
This caliper can measure the outside diameter of an object (outside vernier), the inside diameter of a hole (inside caliper), or the depth of a hole (depth probe).
36
What is the definition of : sublimation
Sublimation is the transition of a substance directly from a solid state to a gas state
37
What is the definition of condensation?
Condensation is the process of gaseous water (water vapor) turning into liquid water
38
What is the definition of diffusion?
the natural spreading-out of molecules in a liquid or gas
39
What is the definition of time ?
time is defined as the measure of a change in a physical quantity or a magnitude used to quantify the duration of events
40
How to find the area of a rectangle?
Length x Width
41
How to find the area of an irregular object?
The overflow can experiment.
42
What are the units for measuring distance?
Kilometres, metres & centimetres
43
What are the measurements for mass?
Kilograms, & grams
44
What are the units for measuring mass?
Grams, Kilograms and tonnes
45
What are the units for volume?
Cubic meters
46
What is a dependent variable?
A dependent variable is what you measure in the experiment and what is affected during the experiment.
47
What is an independent variable?
It is a variable that stands alone and isn't changed by the other variables you are trying to measure. For example, someone's age might be an independent variable.
48
Independent vs dependant variables
An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.
49
What is the zero error?
Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero, eg the needle on an ammeter failing to return to zero when no current flows. A zero error may result in a systematic uncertainty.
50
How to find the mass of liquid?
To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container.
51
How to find the mass of a solid?
If the density of solid is known, its mass can be determined by multiplying density with volume.
52
How to find the volume of a regular solid?
Length X width X height
53
How to find the volume of an irregular solid?
Overflow can experiment
54
How to find the volume of a liquid?
To calculate a liquid volume, divide the mass of the liquid by the density of the liquid.
55
What is the definition of: the scientific method?
A series of logical steps undertaken by a scientist to carry out an experiment fairly
56
What is the definition of: a variable?
Something that can be changed
57
What is the definition of: nucleus
Control center . Made up of chromosomes which contain DNA.
58
What is the definition of: a mitochondria
Makes energy
59
What is the definition of the particle theory?
All matter is made up of tiny particles called atoms
60
What is the definition of a tissue?
A group of cells working together to carry out a function.
61
What is the definition of an organ?
A group of tissues working together to carry out a function
62
What is the definition of a system?
A group of organs working together to carry out a function
63
What is a microscope?
A microscope is a device used to magnify biological specimens

Science (19 decks)

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