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Laabri

Year 8 revision questions (31)

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25 Nsɛmmisa
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5.

Note: metals above hydrogen in the reactivity series will not react with acids.

Note: The oxides of metals below carbon in the reactivity series will be displaced by carbon.

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12.

Method

1. Put 5cm3 of dilute HCl in three different

2. add the metal samples to the HCl

3. Note the rate of

Control variables

same concentration

volume of hydrochloric acid

same mass of metal (we will look into this further in Year 10)

same particle size of metal

same temperature of acid

Results

no bubbles for

magnesium bubbles than iron

Reactivity series from least to most reactive is

Least reactive Most reactive

Mmuae Afoforo a Wobɛpaw:
test tubes
Cu
bubbling
Fe
more vigorously
Mg
copper
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13.

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14.

Note two compounds would neutralise the acid but the question ask for the best!

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18.

From 0-26 cm3 the pH decreases

at 26 cm3 the pH decreases

From 26 - 50 cm3 the pH decreases

Mmuae Afoforo a Wobɛpaw:
rapidly
slowly
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19.

Select the cells where there should be a tick

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20.
Mmuae Afoforo a Wobɛpaw:
Fe
Co
Ca
Ce
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21.
Mmuae Afoforo a Wobɛpaw:
Ni
Cu
Be
Fe
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22.

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23.

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24.

Barium hydroxide + hydrochloric acid --> +

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25.

use a splint

Positive result =

Mmuae Afoforo a Wobɛpaw:
splint relights
glowing
lit
Squeaky pop sound