A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the
substance?
O heating it to find the temperature at which it melts
O exposing it to a flame to see if it catches on fire
O hitting it with a hammer to determine if it breaks or bends
O placing it in water to find out whether or not it dissolves
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Answer : option c) heat is released during the process.explanation :

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.

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o

Qrepresents joules in the formula

It must be measured in k.hope my answer is to you : )