Identify the ionic compound.

A piece of copper with a mass of 75.6 g has an initial temperature of 65.4oC. The piece of copper is immersed in a beaker containing an unknown mass of water at 22.7 C. When the two substances reach thermal equilibrium, the final temperature is 24.2 C. What is the mass of the water, g? Specific heat of Cu = 0.385 J/g ·oC, The specific heat of H2O is 4.184 J/g ·oC

Give the number of valence electrons for CO32-.

What are the coefficients for the following reaction when it is properly balanced?  __Zn(s)+ __HNO3(aq) –>  __Zn(NO3)2 (aq) + __NO2(g) + __H2O(l)

Determine the mass of an object that has a volume of 21.60 mL and a density of 1.98 g/mL. Pay attention to significant figures!

A fixed amount of gas at 25.0°C occupies a volume of 9.80 L when the pressure is 695 torr. Use Boyle’s law to calculate the pressure (atm) when the volume is increased to 15.0 L at the same temperature. 1 atm = 760 torr

What is the molar (M) concentration of phosphate ions (PO43-) in a 725 mL solution containing 155 grams of lead(III) phosphate, Pb3(PO4)4? Molar mass of Pb3(PO4)4 is 1001.4 g/mol

Which section of the flowing heating curve of water represents the heat of vaporization? Which section represents a physical state of liquid?

A  8.50 g sample of copper metal at 22.0°C is heated by the addition of 155 J of energy. The final temperature of the copper is ________°C. The specific heat capacity of copper is 0.38 J/gK  

How many significant figures are in 10.00 mL?