Awelding torch produces a flame by burning acetylene fuel in the presence of oxygen the energy released from the acetylene fuel is then used to melt a metal which energy transformation happens during this process

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

Citric acid has a ph between 1 and 3.  it is considered to be aa. weak acidb. weak basec. strong based. strong acid

During an experiment, ice and water were placed in a perfectly insulated thermos flask at 0 °c. describe this system when it phase reaches equilibrium.