In the construction of bridges and sky scrapers, gaps must be left between adjoining steel beams to allow for expansion and construction of the metal due to heating and cooling. the temperature of a sample of iron with a mass of 20.0 grams changed doom 60.0 c to 35.0c. how many joules of heat were released? a. 200 joules b. 225 joules c. 152 joules d. 346 joules

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

Use the periodic table to find the molar mass of each element. molar mass h = g/mol molar mass s = g/mol molar mass o = g/mol