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Why is the first ionisation energy of barium larger than the first ionsiation energy of caesium?

Barium has one more proton than caesium. The outer electrons of both elements are in the same shell so they feel the same shielding effect. However, as barium has one more proton, barium's outer electrons wi...
JL
Answered by Jeremy L. • Chemistry tutor
6414 Views

Rearrange the following to make c the subject: 11a + 5c = d ( 6 + 2c )

Steps: (1) Multiply out the brackets on the left handside [11a + 5c = 6d + 2dc]. (2) Put all terms containing c on one side and all other terms on the other side of the equation [ 5c - 2dc = 6d - 11a]. (3) T...
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Answered by Jeremy L. • Maths tutor
4180 Views

Outline the circulation of blood and the physical changes of the heart during the cardiac cycle.

The cardiac cycle is split into 2 main phases: systole where the heart contracts and ejects blood out from the heart and diastole where the heart relaxes and fills with blood. The right side of the heart pum...
AM
Answered by Aishah M. • Biology tutor
3220 Views

If a circle passes through points (2,0) and (10,0) and it has tangent line along the y-axis, then what are the possible equations of the circle?

Firstly it will help to draw a diagram of our two points along the x-axis, from this we can find out the x co-ordinate of the center of the circle as these points form a chord of the circle. Where in this ca...
KM
Answered by Kieran M. • Maths tutor
5039 Views

Using a genetic diagram, identify the genotypes of the F2 generation of pea pods if a homozygous green pod and a homozygous yellow pod were crossed initially. The yellow pod contained recessive alleles (g).

A homozygous green pod will have a GG genotype while a homozygous yellow pod will have gg. Each parent has two alleles but only one is passed to an individual offspring via the gametes. In this case, the pos...
JN
Answered by Jessica N. • Biology tutor
5059 Views