When you blow dry your hair
physical or chemical change? and briefly explain why
you forgot to dry the bread knife when you washed it and reddish brown spots appeared on it
physical or chemical change? and briefly explain why
you decide to toast a piece of bread but leave it in the toaster too long. the bread is black and the kitchen is full of smoke.
physical or chemical change? and briefly explain why
baking powder reacts to release carbon dioxide bubbles. the carbon dioxide bubble cause the dough to rise.
physical or chemical change? and briefly explain why
you take out your best silver spoons and notice they are very dull and have some black spots.
physical or chemical change? and briefly explain why
in a fireworks show the fireworks explode giving off heat and light.
physical or chemical change? and briefly explain why

1) this is the structure in the cell nucleus that houses a cell's genetic information

13. calculate the initial concentration (before precipitation) of carbonate ions after the addition of each 0.05 ml of solution b to the 1.00 l beaker of solution a. divide the work among group members and write the answers in the table in model 3. assume the volume change as solution b is added is negligible. 14. notice the initial concentrations of zn2+ - and cu2+ in the table in model 3. a. explain how these were obtained from the data in model 2. b. as solution b is added and precipitates form, do these initial concentrations change? 15. use the data in model 2 to indicate the presence of precipitate (either znco3 or cuco3) after each 0.05 ml addition of solution b in model 3. 16. use the initial concentrations of carbonate ions and zinc ions to calculate the reaction quotient, qsp for the zinc carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3. 17. use the initial concentrations of carbonate ion and copper(ii) ions to calculate the qsp for the copper(ii) carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3.

(1.6 × 10-19)(5.0 × 106) = c × 10d identify the missing numbers below to show the result of multiplying the numbers.