Practice exam 1: of the choices below, which one is not an ionic compound, boron has two naturally occurring isotopes, 10b with an atomic mass of 10. 0129370 amu and 11b with an atomic mass of 11. 0093054 amu. The atomic mass of boron is 10. 81 (from the periodic table). The percent abundances of the boron isotopes are __________% 10b and __________% 11b: pcl5, mocl6, rbcl, pbcl2, nacl, 81. 0, 19. 0, 9. 9, 90. 1, 49. 0, 51. 0, 20. 0, 80. 0, 1. 0, 99. 0. Part ii: complete the following table (all empty cells): Complete the following table (all empty cells in both rows): Ch141, fall 2016: selenium, an element used in the manufacture of solar energy devices, forms an oxide that contains only one atom of selenium (per formula unit) and is 37. 8% oxygen by mass. What is the molecular formula of the oxide: a solution with a total volume of 1000. 0 ml contains 37. 1 g mg(no3)2.
A B C D E F G H I J K L M N O P Q R S This reagent is added fresh samples in test A3 where there was no reaction in tests A1 or A2. A B C D E F G H I J K L M N O P Q R S Mixing AgNO3 and NaCl will produce what white precipitate. A B C D E F G H I J K L M N O P Q R S This is the reagent added after 6M HCl during test B1. A B C D E F G H I J K L M N O P Q R S Lead Nitrate (Pb(NO3)2) will combine with hydrochloric acid (HCl) to form what white precipitate? A B C D E F G H I J K L M N O P Q R S In test A2 you add this reagent to the test where a precipitate was formed. A B C D E F G H I J K L M N O P Q R S The name for a positively charged ion is....
