To test the presents of sulphate ions in solution of substance, why we add BaCl^2 or Ba with other nitric acid instead of adding barium metal alone? why barium itself cannot test the presence of sulphate ions? Thank you.
hello according to my textbook, it says metals react with dilute acids e.g. chlorine to form a salt and hydrogen gas. Don't you need to include that? For example, Ca(s) + 2HCL(aq) > CaCl2 + H2
Yes however the reaction is very very slow with cold water and the hydroxide isn't very soluble so you don't get a very strong alkaline too. Oxides are produced when reacted with steam.
How would you know if a metal + water would form a metal oxide or metal hydroxide? For the magnesium reaction I don't understand why it forms magnesium oxide and not magnesium hydroxide.
As a general rule, if a metal reacts with cold water, you get the metal hydroxide. If it reacts with steam, the metal oxide is formed. This is because the metal hydroxides thermally decompose (split up on heating) to give the oxide and water.
What if it reacts with an excess of water ? I was answering an exam question and it said to Show the reaction of calcium with an excess of water??? but the answer is nothing like the video or anything i've learnt ? Please help Thanks :)
+mavihs26 Ohh... Don't know what that is?! Excess water wouldn't have much of an impact. The reaction will be Ca + 2H2O --> Ca(OH)2 + H2. Calcium hydroxide is partially soluble so you will so some solid settle. Hope this helps.
A Level Chemistry by Allery Tutors Thanks for the help :) It turns out I never read the question properly it said Ionic Equation and i wrote the symbol equation, Thanks again :)
your head shines like a beacon of hope for all chemistry students
I think you've just saved my life thanks for this RUclips Chanel
+bubble Thanks very much! So happy the vids are saving lives! Ha. Keep up the hard work and enjoy chemistry! 👍
Thank you so much for making these videos! I love the way you explain things, just the right amount of details, they are perfect for revision!!
Great video, made it all so much clearer
thanks, I was so confused but your video explained everything
You're welcome!
To test the presents of sulphate ions in solution of substance, why we add BaCl^2 or Ba with other nitric acid instead of adding barium metal alone? why barium itself cannot test the presence of sulphate ions? Thank you.
So Mg(OH)2 is possible? But what about MgO?? I'm slightly confused as you said magnesium forms MGO with water where did Mg(OH)2 come from??
hello according to my textbook, it says metals react with dilute acids e.g. chlorine to form a salt and hydrogen gas. Don't you need to include that?
For example,
Ca(s) + 2HCL(aq) > CaCl2 + H2
Do we need to know why the solubility of different group 2 salts increases or decreases?
Thank you very much!
It's a good revision video as my Chemistry MCQ's are coming up ^_^
You're welcome! Please share the videos.
Acts as Bases: So for reaction 2 to work, you need water at the beginning?
Can Mg form a hydroxide? (bottom line of Acts as Bases), while in top left, you said when reacting with water (steam) it would form an oxide.
Yes however the reaction is very very slow with cold water and the hydroxide isn't very soluble so you don't get a very strong alkaline too. Oxides are produced when reacted with steam.
How would you know if a metal + water would form a metal oxide or metal hydroxide? For the magnesium reaction I don't understand why it forms magnesium oxide and not magnesium hydroxide.
As a general rule, if a metal reacts with cold water, you get the metal hydroxide. If it reacts with steam, the metal oxide is formed. This is because the metal hydroxides thermally decompose (split up on heating) to give the oxide and water.
Ohhhh, right that makes sense. Thank you :)
So you always form the hydroxide generally, but in high temperatures it breaks down to the oxide.
Yes. That's right.
What if it reacts with an excess of water ? I was answering an exam question and it said to Show the reaction of calcium with an excess of water??? but the answer is nothing like the video or anything i've learnt ? Please help Thanks :)
+mavihs26 Ohh... Don't know what that is?! Excess water wouldn't have much of an impact. The reaction will be Ca + 2H2O --> Ca(OH)2 + H2. Calcium hydroxide is partially soluble so you will so some solid settle. Hope this helps.
A Level Chemistry by Allery Tutors Thanks for the help :) It turns out I never read the question properly it said Ionic Equation and i wrote the symbol equation, Thanks again :)
This was so good!
This was better than my lectures
are your videos strictly biased off of the as level or are their also a level content as well?
I love your videos I swear to god!!
WAUUTUH
much love , great vids
:)
2Be + cl2 -----> 2BeCl. Is this wrong ? I don't understand why it's
Ohh wait , I think it's because the charges of 2+ and 1- aren't the same then. Sorry. Got confused because of cl2 ----> 2cl + 2e-
Love ur vids can u zoom in to the board a bit please thx?
thankyou sir. its was really helpful
group 2 only reacts with oxygen, chlorine and water?
They can react with other chemicals too. This vid only looks at the ones you need to know for exams.
Allery Chemistry okay that clears stuff up
Why don't you do a channel for Physics and Biology??
Heh. Not as good at them subjects as I am with chemistry. Strangely I'm better at economics! Maybe a channel for the future?
my love
Nice twitter bird. :)
+Top Ten Teacher Thanks! I'm no artist though!🙂
Maybe some hidden talent? :)