Anonymous32

I am very sorry that I did not give a full explanation. 1(a) (i) Oxidation state of indium: 3+ as indium is in group 3 ii)Equation for indium metal and dilute nitric acid: In(s) + 3HNO3 (aq) In(NO3)3 (aq) + 3/2H2 (g) (iii) Oxidised species: Reduced species: Oxidised: Indium Reduced: Hydrogen (iv) Equation for indium metal and conc. nitric acid: In(s) + 4HNO3 (aq) In(NO3)3 (aq) + NO + 2H2O(l) (v) Equation for formation of indium hydroxide: (vi) Equation for formation of indium oxide: (vii) Maximum mass of indium oxide: I have stated the whole question along with the answers for each part. From part v onwards, I am stuck. I believe this is a step-by-step process where we have to use the products from the previous reaction to solve the next part. However, I am confused how they expect us to write an equation using one compound. This question is from the Cambridge Chemistry Challenge. I am very sorry that I did not fully explain this question, but I hope this helps and any help would be highly appreciated. Thank you!

the formation of indium nitrate using indium metal and concentrated nitric acid

how do you form indium hydroxide using indium nitrate? the equation for fromation of indium nitrate is In +4HNO3 --> 2In(NO3)3 + NO +3H20

sorry, i will make sure to do that next time! yes, i wanted to show what is bonded to what, thank you!

when you draw the displayed formula of a molecule, does it matter how you draw it as long as each atom makes the right number of bonds? for example, does it matter what the molecule C3H4O3 looks like as long as the carbon makes 4 bonds each, the oxygen 2 and the hydrogen 1?

don't worry, i have figured it out thanks

The half equation for the conversion of hydrazine to nitrogen gas.

how do i balance this half equation NO2- + H+--> NH2OH +H20 sorry nvm i worked it out

thank you!

thank you so much, i was so stuck on it, this was very helpful!! i also have two questions 1) when recording a force value, should it be to 2 significant figures 2)A car starts from rest and accelerates down a slope. The acceleration remains constant as the car travels from the top to the bottom of the slope. The average speed of the car is 2 m/s. The speed of the car as it reaches the bottom of the slope is: A. 0 m/s B. Between 0 m/s and 2 m/s C. 2 m/s D. Between 2 m/s and 4 m/s E. 4 m/s F. Greater than 4 m/s

acceleration= change in velocity/time taken?

A student predicts that a steel ball dropped from rest from a height of 2 m will hit the floor after 0.63 seconds. In their calculation they used an approximate value for the acceleration due to gravity of g = 10 m/s2 . The accepted value for the acceleration due to gravity is g = 9.8 m/s2 . This means their calculated time will be: A. unaffected B. too long by about 1% C. too short by about 1% D. too long by about 0.2 seconds E. too short by about 0.2 seconds

A car starts from rest and accelerates down a slope. The acceleration remains constant as the car travels from the top to the bottom of the slope. The average speed of the car is 2 m/s. The speed of the car as it reaches the bottom of the slope is: A. 0 m/s B. Between 0 m/s and 2 m/s C. 2 m/s D. Between 2 m/s and 4 m/s E. 4 m/s F. Greater than 4 m/s

does anyone know any hard biology questions i can do applying gcse knowledge but not gcse style questions?

Hi, Does anyone have the answers to the 20201 past paper for the biology Olympiad? I am currently preparing for it and there is no mark scheme and the answers aren't online. Any help will be very much appreciated! Thank you!!!