Search our library of GCSE questions

Top answers

All subjects

GCSE

50.0 g of propene reacts with hydrochloric acid to produce 1-chloropropane. Calculate the percentage yield if only 54.0g is made.

STEPS:Write the equation CH3CHCH2 + HCl -> CH3CH2CH2Cl + H2 (where 1-chloropropane made by electrophilic addition reaction)Identify number of moles of propene used. So number of moles is m/ Mr= 50.0g ...

Answered by Ravinder K. • Chemistry tutor

3062 Views

A line intercepts point A at (4,4) and point B (8,12). Find the gradient and the intercept of the line.

First, calculate the gradient of the line (m) using the equation using dy / dx.m = dy / dx = (y_2 - y_1) / (x_2 - x_1) = (12 - 4) / (8 - 4) = 8 / 4 = 2.As you now know the gradient of the line and points ...

Answered by Alex F. • Maths tutor

2713 Views

ABC is a right-angled triangle (B being the right angle). Is AB=12 and BC=9, What is Angle A? (3.s.f.)

If you having trouble visualising it, try drawing a diagram. Start with SohCahToa. As A is opposite side BC=9, Opposite =9 As AB=12 is adjacent to A, Adjacent=12 Both opp...

Answered by Catherine P. • Maths tutor

2867 Views

Lee este texto y indica tu respuesta a la pregunta siguiente: ¿Donde va Olivia cada viernes?

"Hola, me llamo Olivia. Tengo veinte años. Soy estudiante de matemática, pero me gusta dibujar mas que me gusta resolver problemas de matemática. Cada viernes, voy a una clase de arte."
1) ...

Answered by Kimberley L. • Spanish tutor

1707 Views

A is (2,12) and B is (8,2). What is the midpoint of AB?

To find the midpoint we add both x coordinates together and divide by 2. 2+8= 10, 10÷2 = 5 We then add both of the y coordinates together and divide by 2. 12+2 = 14, 14÷2 = 7Then we are given the coord...

Answered by Madelaine D. • Maths tutor

14548 Views