Need help with my chemistry a level homeowork plzz

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2939HIHI
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#1
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1.when a metal reacts with acid, why does the mass appear to decrease?
2. When a metal forms a metal oxide, why does the mass appear to increase?
3.
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bk41n
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2. metal oxide ur adding Oxygen molecules so mass increases
1 the metal reacts with the acid so id assume it corrodes n the metal atoms react with the aside to decrease the mass of the left over metal
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lil_lily__
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(Original post by 2939HIHI)
1.when a metal reacts with acid, why does the mass appear to decrease?
2. When a metal forms a metal oxide, why does the mass appear to increase?
3.
for 1, the answer is that:
metal + acid —> salt + hydrogen
so as the hydrogen is a gas, it can’t be weighed by the mass balance so theres a perceived loss in mass.
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2939HIHI
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Also, what mass of solute is present in a solution with a concentration of 9.2g/dm^3?
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bl0bf1sh
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depends on the volume? if the volume is 1dm^3 then there will be 9.2g of solute
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scimus63
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1. a gas, hydrogen is released.
2. Oxygen is added to the metal so its mass will increase
try here it may help a bit

https://www.science-revision.co.uk/m...reactions.html
https://www.science-revision.co.uk/m...eactivity.html
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