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The limiting reactant in a chemical reaction is always the reactant which is present in the least amount in terms of mass

The limiting reactant in a chemical reaction is always the reactant which is present in the least amount in terms of mass.

 

112.              When calculating the percent yield of a reaction, the only information necessary is the mass of the starting materials.

 

113.              A calorie used by nutritionists is equal to 1000 cal or 1 kcal used by chemists.

 

114.              One calorie is the amount of heat energy required to raise the temperature of 10.0 g of water by 1oC.

 

115.              When a substance cools from a high temperature to a low temperature, its heat change will have a negative sign.

 

116.              The heat capacity of a substance is the amount of heat energy that is needed to cause the substance to melt.

 

117.              In a bomb calorimeter, the bomb itself, the water surrounding it, and the thermometer would be considered part of the “system.”

 

118.              When fats or other foods are burned in a bomb calorimeter, the system absorbs heat, so the reaction is endothermic.

Feb 15 2020 Read more Less More

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