A 101 g of an unknown metal at 50 o C is placed in 40 g of water at 25.0 o C (C p for water is 1 cal/g o C). The temperature of the system at equilibrium is 29.7 o C. What is the unknown metal?

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Is a pencil falling to the floor anon contact force, a force, or a contact force