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)
Alright ..
In order to use oxygen the water will be sucked upwards , We are not talkin abt the level of beaker , its the TUBE ..if oxygen is being used up wont the level X fall !!
thank you sooo much u helped a lot!!
Alright ..
lets take any element fron grp 0 according to student 2
eg : I take Argon , question says that Atom X (eg: Argon) has 8 more elctrons than Atom Y
The proton number of Argon is 18 which is equal to the number of electron
So, subtract 18-8=10 and check in the periodic table for the element with the proton number 10
Neon has the proton number 10
Now ,Neon and argon are unreactive? Yes! Are they in the same group? Yes!
So your answer is A
. Answer : B.
if copper is heated, mass increases because it becomes copper oxide. if copper carbonate is heated, mass will reduce because carbondioxide is formed. if copper oxide is heated, it will decompose and so mass will reduce. if hydrated copper sulphate is heated, it will become dehydrated, and so mass will reduce. so the answer is A.
D will become dehydrated so there will be a decrease in mass
B doesn't melt. it decomposes
This is the question she asked:I think the answer is B, because they never said that it is a noble gas, so let's take for example as element X instead of argon, sodium, sodium's proton number is 11, and they say that element Y has 8 more electrons than element X, so 11+8 = 19, 19 is the proton number of Potassium. So it is not necessarily a noble gas, it must be in the same group but not necessarily group 8/0
copper oxide will decompose?
yes
I think because B, C and D are all invalid for the answer because they will lose mass since copper (II) oxide will decompose I think to copper and oxygen, and the oxygen will be lost so the mass will decrease. Copper (II) carbonate when heated forms copper oxide and carbon dioxide, carbon dioxide escapes, decreasing the mass. As for D, which is hydrated copper (II) sulfate, when heated, water evaporates, so the mass decreased. In the question the mass increases, so B, C, D are all invalid. A is the correct answer because when copper is heated, the oxygen in the air combines with the copper forming copper oxide, increasing the mass. Wheew hope this helped
if copper is heated, mass increases because it becomes copper oxide. if copper carbonate is heated, mass will reduce because carbondioxide is formed. if copper oxide is heated, it will decompose and so mass will reduce. if hydrated copper sulphate is heated, it will become dehydrated, and so mass will reduce. so the answer is A.
Oh okaye can u give me the equation? thx
yeah, you're right.
For almost 10 years, the site XtremePapers has been trying very hard to serve its users.
However, we are now struggling to cover its operational costs due to unforeseen circumstances. If we helped you in any way, kindly contribute and be the part of this effort. No act of kindness, no matter how small, is ever wasted.
Click here to Donate Now