1. 1. How much heat energy (q) would be needed to warm a 100g sample of lead (Pb) from 21°C to 621 °C where melting occurs. (c of Pb = .129 J/g °C) q= m= C= AT = (Twarmer - Tcooler)

Using the thermodynamic information in the aleks data tab, calculate the standard reaction free energy of the following chemical reaction: →+p4o10s6h2ol4h3po4s round your answer to zero decimal places.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse