Chemistry MCQ thread...

[Mr."S"]

How do you even break this question down

 

[Thelastmoment]

View attachment 62472 How do you even break this question down

is it six? like B?

 

[amina1300]

is it six? like B?

Its seven

 

[Mr."S"]

is it six? like B?

'Fun fact ' I actually forgot from which year i have sent this

 

[amina1300]

'Fun fact ' I actually forgot from which year i have sent this

its s14 p12 do you have more questions you want solved?

 

[amina1300]

tf is this

 

[Mr."S"]

its s14 p12 do you have more questions you want solved?

Any predictions ?

 

[Thelastmoment]

wdf is that eh?

 

[amina1300]

Any predictions ?

Are you kidding me....

 

[Mr."S"]

Are you kidding me....

Maybe idk the prediction for physics practical was so accurate maybe you might know what might be the key question

 

[insharah]

Q15- Electronegativity increases across the period and so does first ionisation energy ( since atomic size decreases as nuclear charge increases)
So if you check the data booklet Mg has a higher first ionisation energy than Al so answer is B.

thank uuu

 

[insharah]

A chemist took 2.00dm3 of nitrogen gas, measured under room conditions, and reacted it with a large volume of hydrogen gas, in order to produce ammonia. Only 15.0% of the nitrogen gas reacted to produce ammonia. What mass of ammonia was formed?
A 0.213g
B 0.425g
C 1.42g
D 2.83g

pleaseee helpp urgentt!!!!

 

[Mr."S"]

A chemist took 2.00dm3 of nitrogen gas, measured under room conditions, and reacted it with a large volume of hydrogen gas, in order to produce ammonia. Only 15.0% of the nitrogen gas reacted to produce ammonia. What mass of ammonia was formed?
A 0.213g
B 0.425g
C 1.42g
D 2.83g

pleaseee helpp urgentt!!!!

Is the answer o.425

if it is then first find the moles of nitrogen gas then take 15% of the moles
then take mole ratio with ammonia produced that would be 1:2
then you can use the formula n=m/Mr to find the mass of ammonia produced

 

[insharah]

Is the answer o.425

if it is then first find the moles of nitrogen gas then take 15% of the moles
then take mole ratio with ammonia produced that would be 1:2
then you can use the formula n=m/Mr to find the mass of ammonia produced

yes it is dear, thank u so much

 

[insharah]

tf is this

hahaha

 

[insharah]

In China, the concentration of blood glucose, C6H12O6, is measured in mmol / l . In Pakistan, the concentration of blood glucose is measured in mg/ dl. The unit l is a litre (1dm3 ). The unit dl is a decilitre (0.1dm^3 ).
A blood glucose concentration of 18.5mmol/l indicates a health problem.
What is 18.5mmol/l converted to mg/ dl?
A 33.3mg/ dl
B 178mg/ dl
C 333mg/ dl
D 3330mg/ dl

answer is C

PLEASE HELPP

 

[insharah]

Is the answer o.425

if it is then first find the moles of nitrogen gas then take 15% of the moles
then take mole ratio with ammonia produced that would be 1:2
then you can use the formula n=m/Mr to find the mass of ammonia produced

YES IT IS
THANKS!

 

[Okabe Rintarou]

9701_w13_qp_11 Q.3, 7, 11 plss.

 

[Tuesonn]

9701_w13_qp_11 Q.3, 7, 11 plss.

Question 3: first step to do is to balance the second equation with the first equation with equal electrons. Combine both the two equations and you will get B.

Question 7: Answer is B because it is the reverse of homolytic fission of chlorine, which means it will release energy and no energy need for it to happen.

Question 11:

Using the equation : mass of water x specific heat capacity x change in temperature = heat released
=(150-50) x 4.18 x (53-20) = 13794 J
This is the heat produced by the burning of methanol to the water.

 

[Deeksha Tamang]

When solid ammonium chloride dissociates at a certain temperature in a 0.500dm3 container, ammonia and hydrogen chloride are formed. NH4Cl(s) NH3(g) + HCl(g) The initial amount of ammonium chloride was 1.00mol, and when the system had reached equilibrium there was 0.300mol of ammonium chloride. What is the numerical value of Kc for this reaction under these conditions?
A 0.490 B 1.63 C 1.96 D 3.27
can u show me how to sove it??