Classify the following as chemical change (cc), chemical property (cp), physical change (pc), or physical property (pp). 1. Heat conductivity 8. Combustible 2. Silver tarnishing 9. Water freezing 3. sublimation 10. Wood burning 4. magnetizing steel 11. Acid resistance 5. length of metal object 12. Brittleness 6. shortening melting 13. Milk souring 7. exploding dynamite 14. baking bread

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

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.)

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures