Top answers

Solve x^2 - 7x > -6

We want to find the values of x for which this inequality is 0. Let's first fine the values of x for which x 2 - 7x = -6.Rearranging, x 2 - 7x + 6 = 0. Now we're looking for the values of x for which x 2 - 7...
LG
Answered by Lucas G. • Maths tutor
4763 Views

What is the volume of a gas in a closed system working under ideal conditions at r.t.p of 1.5 moles of gas?

PV = nRTP =101 kPa = 101 000 PaV =?T= 298 KR = 8.314 J K -1 mol -1 n = 1.5 molV = nRT / P = 1.5 mol x 8.314 J K -1 mol -1 x 298 K / 101 000 Pa = 0.0368 m 3
TB
Answered by Theo B. • Chemistry tutor
2090 Views

A sample of the ore haematite contains 70% iron oxide. Calculate the amount of iron oxide in 2000 tonnes of haematite.

2000 tonnes H0.7 x 2000 tonnes = mass of iron oxide = 1400 tonnes
DO
Answered by Daisy O. • Chemistry tutor
4396 Views

Describe an experiment to determine the spring constant of a spring? Your answer should include any causes of inaccuracy.

A clamp and stand should be used to hold the spring in place. Ensure its parallel to the stand using a ruler, this reduces the effect of random parralax error when measuring extension.Masses should be attach...
AR
Answered by Andrew R. • Physics tutor
13586 Views

Explain why the nuclear model of the atom replaced the plum pudding model of the atom?

Rutherford performs the alpha particle scattering experiment. Alpha particles incident on a gold foil in a vaccum are scattered by a range of angles, due to the electrostatic repulsion between the positively...
AR
Answered by Andrew R. • Physics tutor
8518 Views