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Grade 9 Science > Exam study deck > Flashcards

Exam study deck Flashcards

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1
Q

Which is measured in ohms: resistance, current, circuit, voltage

A

Resistance

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2
Q

Which is measured in amps: circuit, voltage, resistance, current

A

Current

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3
Q

What does a voltmeter calculate

A

It calculates the voltage across the source/battery

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4
Q

What does a Ammeter calculate

A

It calculates the current in a circuit

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5
Q

What does a ohmmeter calculate

A

It calculates the resistance in a circuit

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6
Q

A shorter wire has ——— resistance than a longer wire: less, more, the same

A

Less

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7
Q

When you cool a substance down its resistance: gets larger, gets smaller, stays te same

A

Gets smaller

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8
Q

When the thickness of a wire increases the resistance of a wire: increases, decreases, stays the same

A

Decreases

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9
Q

When the resistance in a circuit decreases the current: increases, decreases, is unchanged

A

Increases

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10
Q

If you increase the voltage of the source, and the resistance stays the same, what happens to the current: increases, decreases, stays the same

A

Increases

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11
Q

If the source in a parallel circuit has a voltage of 1.5V and there are 3 bulbs what is the voltage across each lightbulb

A

The voltage would be 1.5 because each path in a parallel circuit gets the full voltage of the source.

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12
Q

If 3 bulbs are in a parallel circuit with a current of 2A what is the current flowing through the battery

A

The current would be 6 because in a parallel circuit the current of the battery is divided between the bulbs so 2x3 would be 6

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13
Q

If you 3 bulbs with 3V in a series circuit what would be the voltage of the battery

A

The voltage would be 9 because in a series circuit the voltage of the battery is evenly divided between the bulbs so 3x3 would be 9

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14
Q

Would the current stay the same between the lightbulbs and the battery in a series circuit

A

Yes they would

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15
Q

If a negatively charges rod makes contact with a neutral sphere what will happen

A

the electrons in the rod transfer to the neutral object to make the sphere negatively charged

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16
Q

What is alternating current electricity

A

A type of electrical current where the direction of the flow of electrons switches back and forth instead of having one steady flow

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17
Q

Why is static electricity more of a problem in the winter than in summer

A

Because there is less humidity in the winter and in the summer humid air picks up charge better

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18
Q

How is lightening formed

A

Negative charges gather near the base of the cloud, while positive charge builds at the top of the cloud, this allows electric fields to form between the clouds and the ground.

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19
Q

Niche def

A

The functions species serves in their ecosystem (Where they live, what they eat, what eats them, how it behaves)

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20
Q

Abiotic def

A

Non-living components of an ecosystem

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21
Q

Biotic def

A

Living components of an ecosystem

22
Q

Water soluble

A

Will dissolve in water and can be harmful to nervous system or organisms

23
Q

Fat soluble

A

Will dissolve in fatty tissue, stays in the body and will be passed on in the food chain

24
Q

Bioaccumulation def

A

An increase in the concentration levels of a pesticide within the body of an organism overtime

25
Q

Bio amplification/bio magnification

A

A species at a higher Trophic Level feeds on more than one organism below it, pesticide concentrations increase the higher up the food chain.

26
Q

What is photosynthesis

A

Water + sun energy + carbon dioxide(abiotic) —> sugar(carbon in biotic) + oxygen

27
Q

What is cellular respiration

A

Sugar(carbon in biotic) + oxygen —> water + carbon dioxide(abiotic) + cellular energy

28
Q

What 4 elements make up 95% of the body in most organisms

A

Carbon, hydrogen, oxygen, nitrogen

29
Q

What are biochemical cycles

A

Movement of mater through the biotic and abiotic environments, particles are continually consumed, rearranged, stores, and released.

30
Q

Explain the Water cycle

A

Liquid water evaporates into water Vapor, condenses to form clouds, and precipitates back to earth in the form of rain or snow, (Liquid water flows across land (runoff), into the ground (infiltration), through the ground (groundwater). Groundwater moves into plants (plant uptake) and evaporates from plants into the atmosphere (transpiration) ad the cycle repeats.

31
Q

Explain the carbon cycle

A

Carbon moves from the atmosphere to plants. Through the process of photosynthesis, carbon dioxide is piled from the air to make food for plant growth. Carbon moves from plants to animals through food chains. Carbon moves from pants and animas to soil, when organisms die their bodies, wood and leaves bring the carbon into the soil. Carbon moves from organisms when we breathe and plants and animals get id of carbon dioxide through respiration. Carbon moves from fossil fuels when they are burned. Carbon moves from the air into the oceans, they absorb some carbon and it is dissolved into the water. This cycle repeats.

32
Q

What are the three ecological pyramids

A

Energy, biomass, numbers

33
Q

What is the difference between element and compound

A

Element is composed of only one type of atom where as a compound has two or more different types of atoms bonded together to form molecules

34
Q

How can you use to periodic table to determine how many shells an atom has

A

By using the rows. Each row tells you the amount of shells the atom has

35
Q

All of the atoms in the same column have the same number of ____

A

Chemical and physical properties

36
Q

What do all the elements of on family have in common

A

They all have the same number of electrons or spaces in their outer shell

37
Q

What are the physical properties of metals

A

Metal, shiny, solid at room temp, malleable, good conductor of heat and electricity

38
Q

What are physical properties of a non-metal

A

No a metal, dull, brittle, most re gasses at room temp, poor conductors of heat and electricity

39
Q

What are métalloïdes

A

Elements that have physical and chemical properties of both a metal and non-metal

40
Q

3 examples of métalloïdes

A

Boron, silicon, arsenic

41
Q

What are métalloïdes commonly used for

A

To are semiconductors that are used in computer chips

42
Q

Emulsion def

A

A type of colloid where tiny drops of liquid are in another liquid

43
Q

Colloid def

A

Mixture where solids or drops of liquid are suspended but they do not settle out

44
Q

Quantitative properties

A

Characteristics that are measured

45
Q

Qualitative properties

A

Descriptions made without measurements

46
Q

Describe the atomic element of an element

A

The number of protons in the atoms nucleus

47
Q

Describe the atomic mass of a element

A

The number of neutrons plus t6he number of protons

48
Q

Unscramble this formula CaCO3

A

1 calcium
1 carbon
3 oxygen

49
Q

Fe2O3

A

2 iron
3 oxygen

50
Q

Compare protons and electrons

A

Proton:
Positive charge, part of nucleus, heavy, mass is 1
Electron:
Negative charge, orbits around nucleus, light, mass is 0

51
Q

What are some indicators that a chemical change has occurred

A

Colour change, production of odor, change of temp, something is burning

52
Q

Indicators of a physical change

A

Change of size or shape, reversible, change in state of matter, no new substance formed

Grade 9 Science (5 decks)

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