35. In a calorimeter, the energy content of a substance is calculated from a measure of the temperature change in a known mass of
a. iron
b. air
c. water
d. steel
C?
36. A decrease in the reactant concentration, per unit time, in a reaction is a measure of the
a. heterogenous reaction
b. reaction rate
c. overall reaction
d. reaction mechanism
Not sure..
Thanks
-MC
35 is right.
36 is b.
35. c. water
In a calorimeter, the energy content of a substance is calculated by measuring the temperature change in a known mass of water. Water is commonly used in calorimetry experiments because it has a high specific heat capacity, meaning it can absorb and retain a large amount of heat energy.
36. b. reaction rate
A decrease in the reactant concentration, per unit time, in a reaction is a measure of the reaction rate. The reaction rate is a measure of how quickly reactants are being converted into products in a chemical reaction. So, a decrease in reactant concentration over time indicates that the reaction is proceeding at a slower rate.
35. To determine the energy content of a substance in a calorimeter, you need to measure the temperature change in a known mass of a substance. This is done by measuring the heat transfer between the substance and its surroundings. Since calorimeters are commonly filled with water, the correct answer would be c. water.
36. A decrease in the reactant concentration, per unit time, in a reaction is a measure of the reaction rate. The reaction rate is a measure of how fast a reaction proceeds. By monitoring the change in reactant concentration over time, you can assess the rate at which the reactants are being consumed. Therefore, the correct answer would be b. reaction rate.