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Uses of hydrogen gas include;Hydrogenation of oil to fatIn balloons for meteologyIn welding and cutting metals
The chemical name of rust is Hydrated Iron (III) oxide
Boyle's law for an ideal gas using kinetic theory is;Halving the volume doubles the number of collision per unit time hence the state of change of momentum will also double.
Chemical methods of dating fossil are;Radio-carbon dating/carbon 14 datingPotassium argon dating
There are a number of approved Hospitals that offer COVID-19 tests in Kenya. It all boils down to how long you are ready to wait for the results. Kenyatta University Hospital is the most affordable. It costs Kenya Shillings 3,000 for COVID-19 test. It releases test results from 1 to 3 days. If you are traveling and want 24 hours results, then Nairobi West Hospital is your best choice. It charges Ksh. 6,000. Kenyayote has published a list of hospitals that offer covid-19 testing services in Kenya and their cost here https://kenyayote.com/cost-of-cheapest-covid-19-testing-centres-in-nairobi-kenya/