Top answers

What are the differences between exothermic and endothermic reactions?

Reactions are all about the formation and the breaking of bonds between atoms. The formation of bonds within a system causes energy to be released whilst the breaking of bonds requires energy to be applied t...
WL
Answered by William L. • Chemistry tutor
5912 Views

Make a the subject of a+3=(2a+7)/r

Times both side by r to get ar+3r=2a+7 Subtract 2a and 3r from both side to bring a to one side, ar-2a=7-3r Factorise the left handside, a(r-2)=7-3r Divide both side by r-2, a=(7-3r)/(r-2)
AH
Answered by Arafatul H. • Maths tutor
5731 Views

Why does a spit not always develop into a bar in coastal landforms

Usually the action of water such as an estuary entering the ocean at a coastline provides conditions for erosion and constant flow which means sediment is washed away and transported in the sea and can not b...
EC
Answered by Emily C. • Geography tutor
4425 Views

As one of the body's homeostatic mechanisms, blood glucose levels are controlled for by the hormone insulin. Explain how the regulation in blood glucose differs in a healthy individual and in somebody with type 1 Diabetes?

After the ingestion of a meal containing carbohydrate, glucose is released into the blood stream from the gut. An increase in blood glucose stimulates the secretion of the hormone, Insulin from the pancreas ...
HS
Answered by Hannah S. • Biology tutor
5001 Views

What is the probability of picking a red ball twice from a bag of 6 blue balls and 3 red balls, without replacement.

The probability of picking a ball from a bag is the number of balls of that colour divided by the total number of balls. Therefore in the first instance, the probability of a red ball is 3/9 or 1/3rd. If tha...
TF
Answered by Toby F. • Maths tutor
41870 Views