! Dinner's cooking. Soon we'll be eating some chicken and dumplings. Our digestive system will get to work on the food we eat. The food is moved through our digestive system with the help of what other body system?

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Can someone me with 1 to 4 plz. fast

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.)