Mass

Both of these involve reactions with hydrochloric acid and both involve interpretations from a graph, where kinetics is also tested. Question 5 looks at the reaction between CaCO3 and HCl and then determines the identity of M in M(OH)2. Question 6 looks at the reaction between Mg and HCl. Note that 9min30s into the snapkast I wrote the formula CaCl2 where I should have written CaCO3.

This Chemistry lesson is titled Whats the Difference between Mass Number and Atomic Mass and will give a detailed explanation of the topic.

This Chemistry lesson is titled How to Calculate Atomic Mass Practice Problems and will give a detailed explanation of the topic.

Mass Balance Equations (MBE) states that the quantity of all species in a solution containing a particular atom must be equal to the amount of that atom delivered to the solution. Dissociation of diprotic acid, H2S, in H2O occurs in a stepwise manner. In this video, acid dissociation beginning with H2S dissociating to HS- and then to S2- will be animated. In addition, subsequent base back dissociations are also shown. MBEs are written for the dissociation of H2S in H2O. Videos are also available at: http://www.chemistry.nus.edu.sg/education/undergrads/CourseResources/course_resources.htm = Video Gallery or the "Animol" app on Apple and Google Play Store.

This Chemistry lesson is titled Whats the Difference between Mass Number and Atomic Weight and will give a detailed explanation of the topic.

Determining the aerage atomic mass found on the periodic table.

Mass spectrometry is an analytical technique that involves fragmentation and ionisation of gas phase molecules. From piecing together the fragments of different mass to charge (m/z) ratios, the analyte structure can be deduced. In this video, the internal components of a Quadrupole-Time of Flight mass spectrometer is illustrated and explained. Analysis of caffeine (C8H10N4O2) is animated showing its fragmentation. Fragment ions travel down the flight tube and separate according to m/z ratios in which lighter ions arrive first, while heavier ones arrive later. Animation is shown in the zoomed-out, zoomed-in and sample views. The mass spectrum is also shown with fragments identified.

This Chemistry lesson is titled Percent Composition By Mass and will give a detailed explanation of the topic.

This Chemistry lesson is titled Atomic Number Mass Number and Net Charge and will give a detailed explanation of the topic.