How much heat is evolved when 22.5 grams of a food sample changes the temperature of 0.42 kg of water by 4.4 degree C. Assume specific heat to be 4.18 J/g/C

What is the systematic name of the following compound? SnO2

The chic woman always wore fashionable clothes and was invited to every social event in the city. Based on the clues in the sentence, what is a synonym for chic? sloppy unfashionable stylish quiet

What is the advantage of having large vertebrae at the base of the vertebral column?

Consider a general reaction a) The ΔG° of the reaction is - 4.140 kJ mol. Calculate the equilibrium constant for the reaction. (Assume a temperature of 25°C.) b) What is ΔG at body temperature (37.0°C) if the concentration of A is 1.

DDT, an insecticide banned in the United States for most uses, has the formula C14H9Cl5. Find its percent composition.

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium

How many molecules are in 4.50 moles of H2O? A. 450 molecules B. 6.02 x 1023 molecules C. 2.71 x 1024 molecules D. 3.00 molecules

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride

If the mass of a material is 111 grams and the volume of the material is 11 cm3, what would the density of the material be?