How many single bonds will the following molecule contain? (hint: start by writing the lewis structure for the molecule.) co2

a) 2
b) 1
c) 0
d) 3

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus

In a laboratory determination of the atomic weight of tin, a sample of tin is weighed in a crucible. nitric acid is added, and the reaction proceeds to give a hydrated tin(iv)oxide plus no2and h2o. the hydrated tin(iv)oxide is then heated strongly and reacts as follows: sno2.xh2o(s)sno2(s)+ xh2o(g)the sno2is finally cooled and weighed in the crucible. explain the effect on the calculated atomic weight of tin that would result from each of the following experimental errors: (a)considerable spattering occurs when the nitric acid is added to the tin.(b)the hydrated tin(iv)oxide is not heated sufficiently to change it completely to tin oxide.

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?