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Why are Limestone structures eroded by acid rain?

CO2 present in the air can dissolve in rain water producing carbonic acid. This acid is weak but can give rain water a slightly acidic pH of around 5.6 When this rain water falls it reacts with the claim car...
GL
Answered by Greg L. • Chemistry tutor
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What is a protein and what functions can a protein have?

A protein molecule is a polymer which means it is built when lots of smaller molecules join together in a chain, like building blocks. These smaller molecules are called amino acids. There are are 20 differe...
JT
Answered by Joanna T. • Biology tutor
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How to remember what is Ideal Gas Law?

The trick here is similar to remembering all complicated formulas in science: Assign some meaning to all letters that make some sense, and is easier to remember. Our formula here is pV=nRT, where p-pressure,...
RR
Answered by Reinis R. • Physics tutor
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What is the difference between, Phenol, Phenyl and Benzene

All 3 compounds are basic structures in Organic Chemistry, more precise: Aromatic Chemistry, as all of them have a benzene ring (having a benzene in compound is definition of Aromatic compound). That gives u...
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Answered by Reinis R. • Chemistry tutor
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A child of m1=48 kg, is initially standing at rest on a skateboard. The child jumps off the skateboard moving horizontally with a speed v1=1.2 ms^-1. The skateboard moves with a speed v2=16 ms^-1 in the opposite direction. Find the mass of the skateboard.

We approach this problem using the conservation of linear momentum, which tells us that m1 x v1 = m2 x v2. We substitute the values of m1, v1 and v2, and solve for m2: 48x1.2=m2x16; m2=57.6/16=3.6 kg.
AP
Answered by Alberto P. • Maths tutor
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