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Kon
Questions (3)
A uniform heavy rope hangs freely from a support. the support is made to oscillate horizontally with a small amplitude so as to
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it is given that there are 2moles of nitrate ions and 1.2moles of iron(II)ions in a mixture of iron(II)nitrate and
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It is given a quadratic function y=a(x-h)62+k.If its graph is a parabola with x=2 as its axis of symmetry,and it passes through
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Answers (18)
Repost from aca sucks. 1: both sahel squares 2: (top) sundiata, mali, mana musa, songhai (bottom) 3. trade with greek and romans and influence of a captured syrian servant 4. both were commercial trade centers 5.Mali became primarily a Muslim culture.
The correct answer is D
i thinkthe only ans is x> 0,its impossible to log a negative no.u may try to use a calculator to prove it. then x/x should be done first.so x < -8 or x> -8 is also possible.
8-5x
Attachment: Charge are fixed. eg. Mg(2,8,2)Lose 2 electrons become Mg2+ (2,8).so there are no Mg+ or Mg3+... question: Zn2+ + Cl- ==>? ans:ZnCl2 becuz Cl- has one negative charge,it need two of Cl- to cancel out the 2+ charge of Zn more about ionic bond:
eg.(K lose one electrons become K+) (Cl atom gain one electrons become Cl- ) Conclusion: anion gain electrons from cation,as one positive charge(K+)and negative charge(Cl-)meet,they tend to form ionic compound.(they attach to each other becuz positive and
chemical bonding:-ionic bond -covalent bond -metallic bond (intermolecular force is not a bond) in fact,all bonding have an aim.it is to make the outermost cell of the atom be full of electrons(8 electrons or 2 electrons,two electrons is only for the first
oh sorry,the other part is 39-15 and should be24
Let x be one part and 39-x be the other part. ans:2/3(x)+3/4(39-x)=28 x=15 therefore,one part divided out is 15 and the other part is (15-2)=13
my ans is just to show him the logic of calculate the chapter of reacting mass.and i agree that your method is absolutely good for MC question.
giant metallic structure---delocalized electrons giant ionic structure-----mobile ions giant covalent-----delocalized simple molecular struct.----absence of mobile ions
ya!its due to the delocalised electrons,plz bear in mind that,do not write free electrons during exams,or marks will be deducted!u must write DELOCALIZED ELECTRONS.
Each year decrease 3.8 per cent,so n years remain 51200*(1-0.038)^n, ans: 51200(1-0.038)^14 =29766 customers (corr. to the nearest integer)
additional explanation:this is so called geometric sequence
#3is correct!!!!!!!!!! becuz in wave motion,it transfer WAVE ENERGY only without transferring the matter.Bear in mind!
DrBob222 is wrong.potassium burns with lilac flame when react with water.(of cuz if the reaction is too small,lilac flame is difficult to be observed)
1) slope=0(it means the line is horizontal and parallel to x axis) so, ans: the equation is y=3(this is becuz the line is parallel to x-axis and intercept at y(0,3),all intercept on this line must be y=3)
1) slope=0(it means the line is horizontal and parallel to x axis) so, ans: the equation is y=3(this is becuz the line is parallel to x-axis and intercept at y(0,3),all intercept on this line must be y=0)
