C1 chemistry game gcse all exam boards

Original post by Dizgurl

To make it solid at room temperature?

Yep, so we can use them as spreads to put on toast and bake with!

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Reply 62

Original post by Dizgurl

Catalysts are used to speed up the chemical reaction. Hydrogel is a smart polymer which is used in disposable nappies?

Yep, but in past exams you have to put that they aren't used up in the reaction.

Hydrogel is a good example, we also have heat sensitive polymers that are used in stitches to make sure they aren't to tight and also dissolve harmlessly into the body.

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Reply 63

Milzime

Original post by DamnDaniel2

These are the conditions used in the industrial manufacture of ammonia:

Pressure: 200 atmospheres
Temperature: 450 degrees celsius
Catalyst: Iron

Why are these conditions used? Why don't we increase the temperature or atmosphere?

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it's a compromise between yield and cost/speed, higher pressures are too dangerous and require special expensive equipment,

Reply 64

username1152869

Original post by Anmol_.

Because it's an alkali

Limestone contains calcium carbonate. the carbonate ions thus react with the hydrogen ions in the acidic soil forming water and carbon dioxide and thus rendering the soil less acidic. :colondollar:

Reply 65

Question: Name an alloy, a use of that alloy and why it's stronger then the original metal!

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Reply 66

Question: why can only certain metals be displaced by Carbon from their ore?

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Reply 67

Milzime

Original post by dausa99

Question: Name an alloy, a use of that alloy and why it's stronger then the original metal!

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steel
pots and pans?
because it's a good conductor of heat but has a high melting point, and this is due to the, um, stronger bonds that require more energy to overcome than in the original metal..

Reply 68

Original post by Milzime

steel
pots and pans?
because it's a good conductor of heat but has a high melting point, and this is due to the, um, stronger bonds that require more energy to overcome than in the original metal..

So you got steel right. That's an alloy. We do use them in pots. 👌🏼

We use steel because it's stronger then iron. (cars)

Steel is stronger then iron because of the atoms. Within normal iron, all the atoms are the same size in layers so they can easily move around layers slipping over layers. (bend, snap not strong). However, when you put small amounts of carbon in the iron the different sizes of atoms makes it hard for the atoms to move making it stronger!

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Reply 69

Original post by dausa99

Describe how limestone is quarried

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Reply 70

Original post by dausa99

Question: why can only certain metals be displaced by Carbon from their ore?

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Only a few metals are less reactive than carbon, the metals more reactive than carbon can not be displaced and electrolysis is needed.

If we're talking about Titanium, Titanium ends up reacting with the carbon and is why you use noble gases.

Reply 71

Original post by SunnyBoys

Is that how you draw butene

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Reply 72

Original post by z_o_e

Describe how limestone is quarried

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We use explosives to blast huge holes in the earth and then take the big chunks on limestone and transport them. Noise is noise pollution. Dust is air. Scares animals, lowers biodiversity

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Reply 73

username2574405

Original post by DamnDaniel2

Isn't this the haber process in C3? We don't increase temperature as the forwards reaction is exothermic so it moves the equilibrium the wrong way. Lowering the temperature means a lower rate of reaction so 450 is a compromise.
The pressure is 200 because high pressure favours the forwards reaction so increases yield.
We don't need it for c1, do we?

Reply 74

Original post by z_o_e

Is that how you draw butene

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you draw butene like this CH2CH1CH2CH3 all with single bonds apart from the first c=c bond that will have a double at the beginning

Reply 75

Original post by alyxgower

Nope not at all. Also they don't use any lower than 450 as the rate of reaction would be too low or it would not react at all then.
I have a questions!

Give the differences between the gases in the current atmosphere and the past atmosphere and explain why there has been this difference. Finally, why has carbon dioxide been increasing recently.

This would be like an 8-10 mark questions (I know these don't exist)

Reply 76

What is locked up carbon dioxide!!!?

Reply 77

Original post by z_o_e

What is locked up carbon dioxide!!!?

Is it when carbon dioxide from the early atmosphere formed sedimentary rocks or fossil fuels?

(edited 7 years ago)

Reply 78

Original post by SunnyBoys

Is it when carbon dioxide from the early atmosphere formed sedimentary rocks or fossil fuels?

Yeppp.
Give two methods of cracking?

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Reply 79