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Yr8-Science > Science Revision > Flashcards

Science Revision Flashcards

1
Q

What is photosynthesis?

A

Photosynthesis is the chemical reaction that takes place for the plant to survive . Carbon dioxide, water, and light are all needed for photosynthesis to takes place. It happens in the leaves of the plants.

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2
Q

What is the word and the symbol equation for photosynthesis?

A

Carbon dioxide + water —> Glucose + oxygen

CO2 + H2O —> C6H12O6 + O2

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3
Q

The process of movement of water in plants is called…?

A

Transpiration

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4
Q

Where does photosynthesis take place in a plant?

A

In mitochondria

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5
Q

What is the difference between Aerobic and Anaerobic respiration?

A

Anaerobic respiration is there’s no oxygen or without oxygen.
Aerobic respiration is the opposite of photosynthesis

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6
Q

What are the equations of Anaerobic respiration and aerobic respiration?

A

Aerobic = Glucose + oxygen —> carbon dioxide + water

Anaerobic respiration = Glucose —> Lactic acid + energy

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7
Q

What are the 3 factors of photosynthesis?

A 
Carbon dioxide (CO2) 
Light intensity 
Temperature
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8
Q

What are the different ways that plants use glucose?

A 
Respiration 
Stored as starch 
Store as fats for seeds
Strengthen cell walls 
Makes proteins
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9
Q

What are palisade cells used for?

A

Palisade cells are packed with chloroplasts, which means lots of photosynthesis

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10
Q

What is the stomata for?

A

The stomata is the openings in the underside of the leaf

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11
Q

What is the spongey mesophyll for?

A

The spongey mesophyll is a layer that contains air spaces for gases to diffuse into

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12
Q

What is the equation for speed?

A

Speed = distance / time

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13
Q

The equation for time

The equation for distance

A

Distance / speed = time

Speed x time = Distance

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14
Q

What is the equation for force?

A

Force = mass x acceleration

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15
Q

What is the equation for moments?

A

Moment (Nm) = force (N) x distance from pivot (m)

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16
Q

What is friction used for and what are 3 examples that it’s useful?

A

Friction is a resistive force that slows things down and tries to stop objects sliding past each other.

Breaks, gripping objects, tyres

17
Q

What are 3 examples of friction that aren’t useful?

A

Slipping or sliding, moving parts in machines

18
Q

What is air resistance?

A

Air resistance is a type of friction caused when objects move in the air.

19
Q

What is the other name of air resistance and water resistance?

A

Drag

20
Q

How many elements are there in a periodic table?

A

There is about 100 different elements.

21
Q

What is the units for speed, force and acceleration?

A 
Speed = m/s
Force = N (Newtons) 
Acceleration = m/s2
22
Q

What does a distance time graph show?

A

A distance time graph shows the speed of the object travelling.

23
Q

What is the line called on a distance time graph?

A

Gradient

24
Q

What are the 3 particles found in an element?

A

Protons, electrons and neutrons

25
Q

Where is the particles (protons, neutrons and electrons) found? What is their mass and their charge?

A

Protons are found in the nucleus, it’s relative mass is 1 and it has a positive charge.
A neutron is found in the nucleus, it’s relative mass is 1 and it’s charge is neutral.
An electron is found on the shell, it’s relative mass is 1/2000 and it’s charge is negative.

26
Q

What is ionic bonding?

A

Ionic bonding gives and takes electrons between a metal and a none - metal.

27
Q

What is a covalent bond?

A

A covalent bond is made when non - metal atoms share electrons with another non - metal atom.

28
Q

What is metallic bonding?

A

Metallic bonding is the bonding of 2 metals.

29
Q

What do we call the floating electrons in metallic bonding?

A

A sea of electrons

30
Q

Would it be better if there was no friction?

A

No. If there was no friction there would be no earth.

Yr8-Science (8 decks)

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