Quick and easy data about all of the known 118 elements. If you’d like to know a bit about how the elements were discovered, who discovered them, when and where then here is a book which just gives you the facts. And it you’d like to know why they came to be arranged in the form of the periodic table then here it is. And all written in a way that avoids using words that only chemists understand.
News from the future, of a sustainable world as dictated by the green movement, in which there would be no chemical industries.
When researcher Adam Friend discovers a new artificial sweetener he dreams of the financial success this will bring. What he does not foresee are the conflicts with those who also seek to profit from his work and those who oppose it as another unwanted chemical in our food. Meanwhile, his partner Yvette and her friend Laura become involved in ways that neither envisaged. Adam’s dream becomes a nightmare at the launch of the new sweetener, but then he gets a helping hand from a most unexpected source…
This is a tale of intrigue, deception, plots, romance, and betrayal, and all the while something rather strange is lurking in the background. Book cover of Sweet Dreams
This book devotes a single page to every known element, including the ones named this century, and highlights its most interesting features: where it comes from, how much we use, and what it is used for. There’s also a table of its key properties. At the end of the book is an Element Quiz based on their names and chemical formulas. Yorks Guide to Elements
Radiation is a danger to life, but this is a radioactive planet and we have quite a few radioactive elements in our bodies. Let us look at just one, the best known one: uranium. How many atoms of uranium in the human body undergo radioactive decay per minute?
The amount of uranium in the average person is 0.1mg although some may have only 0.01mg while others can have up to 0.4mg.
The chemical unit of 1 mole is the atomic weight in grams and for uranium this is 238 grams, and 1 mole of any element contains 6.02 x 1023 atoms. This means that 0.1 mg of uranium, which is 0.0001 gram, contains 6.02 x 1023 x 10-4 atoms which is 6.20 x 1019 atoms. We have more than a billion billion uranium atoms in our body.
Uranium consists of two isotopes; 99.3% is U-238 (half-life = 4.5 x 109 years) and 0.7% U-235 (half-life 700 x 106 years). Therefore, of the 6.20 x 1019 atoms uranium in the human body, 5.98 x 1019 atoms are U-238 and 0.04 x 1019 atoms are U-235.
The 5.89 x 1019 atoms will reduce to 2.94 x 1019 atoms in 4.5 x 109 years.
Atoms per year undergoing radioactive decay = 2.94 x 1019/4.5 x 10-9 = 0.65 x 1010.
Minutes in a year = 365 x 24 x 60 = 525,600
Atoms per minute undergoing radioactive decay = 0.65 x 1010 / 525,600 = 12,300
Its 0.04 x 1019 atoms will reduce to 0.02 x 1019 atoms in 700 x 106 years.
Atoms per year undergoing radioactive decay = 0.02 x 1019 / 700 x 106 = 0.286 x 109.
Atoms per minute undergoing radioactive decay = 0.286 x 109/525,600 = 544
Total = 12,800 atoms per minute undergoing radioactive decay.
Which sounds a lot, but is a real threat? However, it is rarely mentioned when others protest about our exposure to other body ‘insults’ from traces of ‘harmful chemicals’ in our food, the implication often being that these are the cause cancer. However, radiation is definitely a cause of cancer but uranium is not the only radioactive element in our body. The others are potassium, carbon-14, thorium, etc.
Does the effect of this natural radioactivity outweigh any impact on the body from chemicals? The body’s repair mechanism obviously evolved to cope with this threat from radiation, as it had to do when dealing with natural materials for which it had no use. The uranium is mainly deposited in the skeleton as uranium phosphate, so it probably does little harm in any case.
Have I got these numbers right? If not then please let me know.
I devised this quiz for the Twilight Meeting of Ampthill Rotary Club which was held on 30th October 2013. The winning score was 19 and the prize was a box of Black Magic chocolates.
1 On which day should Halloween really be celebrated?
• 31st October • 31st November• 31st December
Answer: 31st October
2. What is another name for Halloween?
• Feast of the dead •Feast of the Witches • All Hallows Eve
Answer: All Hallows Eve (Feast of the Witches is 30th April)
3. What does the word ‘Hallow’ mean?
• Ghost • Goblin • Saint
4. Who first celebrated Halloween?
• Vikings • Druids • Egyptians
5. Who celebrates Halloween by eating sweets shaped like skulls?
• Mexicans • Aboriginal Australians • Croatians
6. By whom were witches first condemned?
• Emperor Nero • The Old Testament • Pope Innocent VII
Answer: The Old Testament, in the book of Deuteronomy.
7. When was the last witch burnt in Britain?
• 1527 • 1627 • 1727
Answer: Janet Home at Dornoch, Scotland, in 1727.
8. When did the ancient Celts celebrate their new year?
• 1st November • 21st December • 1st January
Answer: 1st November
9. Where are pumpkins native to?
• Peru • Mexico • USA
10. What is a group of witches called?
• Convoy • Commune • Coven
11. Who was burned as a sacrifice on Halloween in the 1973 film The Wicker Man?
• Edward Woodwardd • John Mills • Herbert Lom
Answer: Edward Woodward
12. What is a male witch called?
• Warlock • Wizard • Sorcerer
13. Who wrote the book Frankenstein?
• Percy Shelley • Mary Shelly • Bram Stoker
Answer: Mary Shelley
14. What type of monster was Frankenstein?
• A man who had been hanged • A man who had suddenly died • A murdered lunatic
Answer: None of these. Dr Frankenstein was his master. Deduct 2 points from your score if you Answered this question.
15. What was Frankenstein’s first name?
• Boris • Victor • Schweitzer
16. Which two colours are associated with Halloween?
• Green and Black • Red and Black • Orange and Black
Answer: Orange and Black
17. Which animals are associated with Halloween?
• Bats • Black cats • Wolves
Answer: Black cats
18. The Celts dressed up in strange costumes for Halloween. Why?
• To scare the spirits away • To placate the spirits • To fool the spirits
Answer: To scare the spirits away
19. What offering did the Druids sacrifice to their gods?
• Goats • Humans • Dogs
Answer: Human beings
20. Which of these people died at Halloween?
• Houdini in 1926 • Harold Shipman in 2004 • People of Canterbury in 1942
Answer: Houdini and the People of Canterbury (air raid victims).
Give yourself an extra point if you ticked the two correct answers.
21. What is the day following Halloween called?
• Angel Gabriel Day • All Saints Day • Deliverance Day
Answer: All Saints Day
22. Which is said to be the most haunted place in England?
• Tower of London • Pendle Hill in Lancashire • Borley in Essex
Answer: Borley in Essex
23. What is a sure sign that a place is haunted?
• Sudden drop in temperature • dogs are afraid to enter • things move of their own accord
Answer: None of them. There are no ghosts. Deduct 2 points from your score if you ticked one of these answers.
24. Why were fonts in churches sealed when not in use?
• To prevent people adding unholy water • to prevent witches stealing the holy water • to prevent evil spirits defiling the holy water.
Answer: To prevent witches stealing the holy water.
25. How many witches are needed to form a ritualistic assembly?
• 7 • 13 • any number
Answer: Any number.
26. When were Black Magic chocolates first produced?
• 1913 • 1923 • 1933
The tie-breaker question would have been the following: What year did trick-or-treat first begin? The person guessing the nearest year wins.
It started in Scotland as ‘guising’, then spread to Canada in 1911, and then to the USA, where it got the name ‘trick-or-treat’ in 1946.