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(D)2022 Science Grade 9 > Science Cycle Test 12 October > Flashcards

Science Cycle Test 12 October Flashcards

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1
Q

Ammeters are connected in …

A

Series

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2
Q

Voltmeters are connected in …

A

Parallel

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3
Q

Function of the cell

A

Supply energy to the charges which move through the conductors and cause an electric current

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4
Q

The chemical energy in a cell in converted into

A

Electrical energy

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5
Q

Potential difference(V)=

A

Energy transferred (W in joules)
———————————————
Charge (Q in coulombs)

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6
Q

Conventional current

A

conventional current is from positive terminal to the negative terminal. The behaviour is like positive charge carriers will cause the current to flow.

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7
Q

Resistance

A

A materials opposition to the flow of electric current

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8
Q

What is resistance measured with

A

Multimeter

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9
Q

What do multimeters measure

A

Direct current, alternating current, potential difference, and resistance

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10
Q

Resistance is measured with which unit

A

Ohm

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11
Q

What are alloys

A

Mixtures if metals and have a Hugh resistance

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12
Q

What is nichrome

A

Mixture of nickel and chrome , is an alloy which is generally used as a resistor

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13
Q

Ohms law

A

The current through a conductor is directly proportional to the potential difference across a conductor at a constant temperature

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14
Q

Resistance formula

A

Resistance (R ohms)=potential difference (V)/current (I unit A)

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15
Q

What is a short circuit

A

Extra path for the charges between two points in a circuit occurs

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16
Q

If a copper wire is connected across a lightbulb the electric current will flow through …

A

The copper wire not the light bulb because the copper wire offers a lower resistance

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17
Q

Charges will take the path of ..

A

Least resistance

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18
Q

What is used to trip the the power if a short circuit occurs

A

Contact-breaker

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19
Q

Factors which influence resistance

A

-type of conductor (compare copper and nichrome)
-thickness of conductor
-length of conductor
-temperature of conductor

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20
Q

Cells in series cause what do happen to potential difference and current strength

A

Cause a greater potential difference and the current strength increases proportionally

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21
Q

A higher resistance leads to a …

A

Weaker current strength

22
Q

Deductions we can make about resistors in series

A

-the current strength in a series circuit is the same throughout the circuit
-the potential different is divided between the resistors :V total=V1+V2+V3
-the total resistance is the sum of the separate resistors :R total =R1+R2+R3

23
Q

What happens to the resistance if more resistors are in parallel

A

They do not increase the resistance if tepee circuit (two lanes on the highway help the traffic flow)the energy transferred to each of the light bulbs is the same as the energy transferred to one lightbulb

24
Q

What are deductions we can make on lightbulbs(resistors in parallel)

A

-the potential difference Ina parallel circuit remains constant
-the current strength is divided between the resistors : Current total =I1+I2+I3
-resistors in parallel have a lower resistance that resistors in series

25
Q

How to calculate effective resistance of resistors in parallel

A
      1. 1
        — =— +— +—
        Re. R1. R2. R3
26
Q

Alkali metals react with water to produce …

A

Alkaline solutions and hydrogen and the speed of the reaction increases down the group

27
Q

General chemical reactions for metals and non-metals (3)

A
  1. Metal + oxygen ~> metal oxide
    2.non metal + oxygen~> non-metal oxide
    3.metal + water ~> metal hydroxide + hydrogen
28
Q

Test for hydrogen

A

Hydrogen makes a squeaky pop with a lighted splint

29
Q

Test for carbon dioxide

A

Carbon dioxide gas
Lime water (clear colourless)
Turns into lime water (cloudy milky )

30
Q

Test for oxygen

A

Oxygen relights a glowing splint

31
Q

Halogens react with water to produce …

A

Acidic solutions

32
Q

Where are alkali metals stored

A

In oil

33
Q

Relative hardness of potassium and sodium

A

Potassium and sodium an doesn’t and can be cut with a knife

34
Q

Potassium and sodium reaction with water

A

-Sodium catches alight immediately with contact with H2O
-potassium has a purple flame
-both spin around on the surface of the H2O and explode loudly after some time

35
Q

Lustre of sodium and potassium

A

shiny metallic when cut open

36
Q

The Softness and reactivity increases when…

A

Going down the groups in the periodic table

37
Q

The physical state of Chlorine

A

Gas

38
Q

The physical state of bromine

A

Liquid

39
Q

The physical state iodine

A

Solid

40
Q

What happens to densities going down the groups

A

Densities increase

41
Q

Melting and boiling points increase when…

A

Going down the groups

42
Q

Metal + oxygen ~>

A

Metal oxide

43
Q

Are metal oxides acidic or basic

A

Basic .Red litmus turns to blue

44
Q

Non-metal +oxygen~>

A

non-metal oxide

45
Q

Are non-metal oxides acidic or basic

A

Acidic .Blue litmus turns red

46
Q

Metal+water ~>

A

metal hydroxide + hydrogen

47
Q

Are metal hydroxides acidic or basic

A

Basic .Red litmus turns blue

48
Q

How to test for hydrogen

A

Hydrogen makes a squeaky pop with a lighted splint

49
Q

Test for carbon dioxide

A

Extinguishes a flame turns lime water (cloudy /milking )

50
Q

Test for oxygen

A

Oxygens relights a growing splint

51
Q

Text for chlorine

A

Has a very distinct smell, chlorine bleaches litmus paper

52
Q

What increases going down the groups in the periodic table

A

Densities
Softness and reactivity
Melting and boiling points

(D)2022 Science Grade 9 (9 decks)

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