In the reaction between formic acid (hcho2) and sodium hydroxide, water and sodium formate (nacho2) are formed. to determine the heat of reaction, 75.0 ml of 1.07 m hcho2 was placed in a coffee cup calorimeter at a temperature of 21.9 °c, and 45.0 ml of 1.78 m naoh, also at 21.9 °c, was added. the mixture was stirred quickly with a thermometer, and its temperature rose to 25.5 °c. write the balanced chemical equation for the reaction. calculate the heat of reaction in joules. assume that the specific heats of all solutions are 4.18 j g-1°c-1 and that all densities are 1.00 g ml-1. what is the heat of reaction per mole of acid (in units of kj mol-1).
write the balanced reaction that takes place:
heat of reaction = kj/mol

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes. which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature. sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false