3.3. The mole and the Avogadro constant
A subsection of Chemistry, 0620, through 3. Stoichiometry
Listing 10 of 39 questions
The table shows the percentage by mass of the elements in the oceans and in the biosphere. The biosphere is all living organisms. element percentage by mass in the oceans percentage by mass in the biosphere calcium 0.05 0.40 carbon 0.01 39.00 chlorine 1.80 0.05 hydrogen 11.00 6.60 magnesium 0.12 0.10 oxygen 85.80 53.00 silicon 0.00 0.10 sodium 1.15 0.05 other elements 0.07 total 100.00 100.00 Answer these questions using only the information in the table. Deduce the percentage by mass of other elements present in the biosphere.  % Which metallic element is present in the oceans in the greatest percentage by mass? Give two major differences in the percentage by mass of the elements in the oceans and in the biosphere.  Living organisms respire. Water is produced during respiration. Name the other product of respiration. Describe a chemical test for water. test observations  
0620_s19_qp_33
THEORY
2019
Paper 3, Variant 3
View
Questions Discovered
39