Brainliestttme :

the reactants of two reactions are shown.

reaction 1: c and o2
reaction 2: k2so4 and cacl2

which reaction is likely to be a redox reaction?

only reaction 2, because potassium and calcium ions will interchange their positions
both, because the electrostatic charge on cations will change during each reaction
both, because the electrostatic charge on anions will change during each reaction
only reaction 1, because the charge of carbon changes during the reaction

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

answerto predict;

it's 3.2 on edge, i just took the test.