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What are Van der Waal forces ?

Van der Vaal forces are temporarily induced dipole forces. At any given time, the density of electrons in 1 atom will repel the electrons in another closely located atom, creating a dipole. Van der waal f...

ST
Answered by Saron T. Chemistry tutor
3856 Views

(a) (i) Give a biological molecule that contains: 1. nitrogen 2. phosphorous (ii) Describe the role of microorganisms in producing nitrates from the remains of dead organims.

(i) 1. amino acid 2. DNA(ii) Decomposer microrganisms break down dead material into ammonia. Ammonia is then converted into nitrite and then oxidised to nitrate by nitrifying bacteria. The process is know...

AS
Answered by Alice S. Biology tutor
7534 Views

f(x)=12x^2e^2x - 14, find the x-coordinates of the turning points.

f(x)=(12x^2)(e^2x) - 14, so using the chain rule f'(x)=(24x)(e^2x) + (12x^2)(2e^2x).To find the turning points set f'(x)=0, so (24x)(e^2x) + (24x^2)(e^2x) = 0. Thus (24xe^2x)(1+x)=0. Thus x=0 or x=-1.

CH
Answered by Charlotte H. Maths tutor
2953 Views

Solve algebraically the simultaneous equations x^2 + y^2 = 25 and y - x = 1

Let's label the equations x2 + y2 = 25 (1) y - x = 1 (2). We can use substitution to solve this simultaneous equation. Let's make y the subject of the equation (2) and we get y = x...

VN
Answered by Vithya N. Maths tutor
8288 Views

Explain three difficulties economists face when they try to measure unemployment accurately.

Unemployment, while useful in some cases, is inherently flawed as a metric for socio-economic progress. Official unemployment statistics fail to take into account the issue of hidden unemployment, defined...

CR
4566 Views

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