what did joseph priestly do

Joseph ate twice the number of biscuits that Martin ate. How many biscuits did Martin eat, if Joseph ate x biscuits? => 2 - x or x + 2 or x - 2 or x 2..

Discovery of Oxygen - Two scientists, Carl Scheele of Sweden and Joseph Priestly of England working independently, discovered oxygen. They published their discovery in 1777. Scheele obtained oxygen by heating potassium nitrate and mercuric oxide and called it "Fire Air". Priestl..

By how much will Joseph′s income increase after a month, if his earnings increase by $100 per week? => $400 or $300 or $500 or $3000..

Joseph earns $12000 per month. He constructs a pie chart based on his salary distriribution. Which part of the circle graph shows the least consumption of his salary? => Monthly Savings or Household Expenses or Taxes or Miscellaneous..

Did You Know - Stephen Hales - Father of plant physiology Lipmann - Father of ATP cycle Winogradsky - Father of nitrogen fixation Destruction of chlorophyll due to high light intensity is called solarisation. DCMU (Dichlorophenyl dimethyl urea) - a herbicide - inhibits oxygen release in l..

Stephen Hales - Father of plant physiology Lipmann - Father of ATP cycle Winogradsky - Father of nitrogen fixation Destruction of chlorophyll due to high light intensity is called solarisation. DCMU (Dichlorophenyl dimethyl urea) - a herbicide - inhibits oxygen release in light phase ..

Using a tree diagram, find the number of ways in which 3 prizes (first, second and third ) can be distributed to the 4 students, John, Mike, Joseph, and Kevin who participated in an essay writing competition. => 4 or 9 or 12 or 6..

Joseph has $1200 to invest at 6% annual interest compounded monthly. How long will it take for his investment to grow to $5000? => 22 years, 11 months or 23 years, 11 months or 24 years, 9 months or 21 years, 7 months..

Did the artist use perspective? => yes or no..

PERSISTENT ORGANIC POLLUTANTS [POP] OR PESTICIDES enter our food chain through various methods. DDT, a very harmful pesticide has been banned from use. Almost all ready made foods contain two or more pesticides. Among fruits and vegetables peaches, apples, spinach and lettuce have the highest amo..