• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Biology; Chemistry; Physics: Post your doubts here!

Messages
1,074
Reaction score
431
Points
93
Messages
250
Reaction score
172
Points
53
Can anybody help me with the instruction of how to prepare a microscopic slide as i have seen it in many papers !! ? Thankyou
 
Messages
663
Reaction score
282
Points
73
i do not find this mark scheme as authentic !!! so plz help and check for q.4,5,6 answers is it correct esp. da volume of CO2 ??
 
Messages
8,392
Reaction score
9,461
Points
573
i do not find this mark scheme as authentic !!! so plz help and check for q.4,5,6 answers is it correct esp. da volume of CO2 ??
Marking Scheme is always authentic, rarely it contains an error. I have solved the paper for following year and I found no difficulty. Can you please specify which question you want me to solve?
 
Messages
402
Reaction score
191
Points
43
1) what is the useful product wen yeast is used in bread making; is ethanol useful or CO2?
2)What is the function of SiO2(silica) in the equation: CaO+ SiO2= CaSiO3
a) basic oxide b) reducing agent c) acidic oxide d) oxidizing agent
 
Messages
3,809
Reaction score
3,115
Points
273
1) what is the useful product wen yeast is used in bread making; is ethanol useful or CO2?
2)What is the function of SiO2(silica) in the equation: CaO+ SiO2= CaSiO3
a) basic oxide b) reducing agent c) acidic oxide d) oxidizing agent

1) CO2 is useful because ethanol does nothing....rarely anything...but CO2 , produced by yeast by respiration, gives rise to the Bread and makes it porous....this way CO2 is useful...ethanol is a waste product which evaporates during BAking..

A) a basic oxide is formed when oxygen reacts with metal....for example NaOH...
B) a reducing Agent is a reagent that oxidises itself to reduce another...for example KI..
C) Acidic Oxide is formed when oxygen reacts with a non metal....for example CO2...
D) Oxidising Agent oxidises the other reagent and reduces itself just like the reducing agent...:)

2) i am not sure so let me confirm for this part...:D

and if there is any mistake please do tell me!! :D
 
Messages
402
Reaction score
191
Points
43
1) CO2 is useful because ethanol does nothing....rarely anything...but CO2 , produced by yeast by respiration, gives rise to the Bread and makes it porous....this way CO2 is useful...ethanol is a waste product which evaporates during BAking..

A) a basic oxide is formed when oxygen reacts with metal....for example NaOH...
B) a reducing Agent is a reagent that oxidises itself to reduce another...for example KI..
C) Acidic Oxide is formed when oxygen reacts with a non metal....for example CO2...
D) Oxidising Agent oxidises the other reagent and reduces itself just like the reducing agent...:)

2) i am not sure so let me confirm for this part...:D

and if there is any mistake please do tell me!! :D
i guess u misunderstood the question. actually question 2 is a MCQ nd a,b,c,d r the options
i think u explained those four terms from a to d, isn't it?
 
Messages
391
Reaction score
262
Points
43
i guess u misunderstood the question. actually question 2 is a MCQ nd a,b,c,d r the options
i think u explained those four terms from a to d, isn't it?
PLZZZZ CAN SOMEONE TELL MEH HOW TO DO PAPER 6 ? :( HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP!
 
Top