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English Vocab > science > Flashcards

science Flashcards

1
Q

What do state symbols tell us

A

liquid=(l)
solid=(s)
gas=(g)
aqueous solution=(aq)
all lower case

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2
Q

what are the effects of acid rain

A

acid rain affects living organisms as well as materials

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3
Q

What is the difference between a chemical and physical change

A

physical change= no new chemicals formed
reversible
etc. melting = solid-liquid
chemical change = new substances formed
not reversible
etc. reactants-products

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4
Q

What is the reactivity series of metals

A
  1. potassium most
    sodium
  2. calcium
    magnesium
    3.aluminisium
    4.(carbon)
    Z zinc
    I iron
    T tin
    L lead
    hydrogen
    jewellery
    copper
    silver
    gold
    expensive platinum
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5
Q

What is the difference between an acid and a base

A

acids tend to taste sour
bases tend to taste bitter
litmus paper turns red in acids
litmus paper turns blue in bases
acids contain hydrogen

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6
Q

What happens in a displacement reaction

A

occurs when a more reactive metal takes place of a less reactive metal
e.g.
potassium+copper nitrate —- potassium nitrate + copper

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7
Q

in the Ph scale what does it mean if it is a reddish colour

A

strong acid

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8
Q

in the Ph scale what does it mean if the colour is yellow/green

A

weak acid

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8
Q

in the Ph scale what does it mean if the colour is green/blue

A

weak base

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9
Q

in the Ph scale what does it mean if the colour is blue/purple

A

strong base

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10
Q

what numbers are acidic in the Ph scale

A

1,2,3,4,5,6

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11
Q

What number is neutral in the Ph scale

A

7

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12
Q

What numbers are alkaline in the Ph scale

A

8,9,10,11,12,13,14

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13
Q

What happens when acid reacts with metals

A

see bubbles as hydrogen is made
temperature increases because it is exothermic reaction
more reactive the metal the bigger the increase

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14
Q

What happens in an exothermic reaction

A

energy is given out to the surroundings
temperature increases
e.g. copper sulfate + water

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15
Q

What happens in an endothermic reaction

A

energy is taken in from the surroundings
temperature decreases
e.g. sodium hydrogen carbonate + acid

16
Q

What happens in a neutralisation reaction

A

is a reaction between an acid and an alkali
the end point of a reaction is a neutral substance

17
Q

how do catalysts affect chemical reactions

A

catalyst: chemical that speeds up reactions so they can be used again and again and again

18
Q

What is the circuit symbol for a bulb

A

circle with x in it

19
Q

How do you calculate resistance

A

resistance= potential difference divided by current

20
Q

What is an electromagnet

A

current carrying wire coil wrapped around an iron bar

21
Q

What are the ends of a magnet called

A

poles

22
Q

What are the three magnetic elements

A

iron (Fe)
Cobalt (Co)
Nickel (Ni)

23
Q

Where is the magnetic force strongest

A

poles of a magnet

24
Q

What happens when two opposite charges are brought together

A

attract

25
Q

What charge do electrons have

A

negative

26
Q

What is the name of the force that acts between charged objects

A

electrostatic

27
Q

Is the force that acts between charged object a contact or non-contact force

A

non contact

28
Q

What is an independent variable

A

the thing we change

29
Q

What is a dependent variable

A

the thing we measure

30
Q

What is a control variable

A

the thing we keep the same

31
Q

How can we change the strength of the magnetic force of an electromagnet

A

changing the size of the current
changing the number of turns of wire

32
Q

What is the unit of resistance called

A

ohms

33
Q

What is current

A

the flow of charge

34
Q

What is a resistor

A

a component we add to a circuit to add resistance

English Vocab (19 decks)

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