The actual enthalpy of the magnesium flare reaction is –603 kj/mol. your experimental value was likely different. check all that apply.

the coffee cup calorimeter may have absorbed some heat.

the plastic coffee cup lid may have allowed some heat to escape.

the thermometer did not measure the temperature of the solution properly.

reading the maximum temperature values from the thermometer could be challenging.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

How are the terms group and period used on the periodic table

Which of the following is a possible formula unit? (2 points) select one: a. pbo b. li2b c. al2pb3 d. clo