A calorimeter experiment is a set-up that provides insulation so that no heat escapes to the surroundings and all energy can be accounted for. It can be done at either constant volume or constant pressure. So, the answer to this is knowing the mass of water, the specific heat which is an empirical data, and the change in temperature which can be measured using a thermometer. This experiment could measure the mass of an unknown substance added or the specific heat of the substance or the calorimeter. <em>The answer is D.</em>
Answer:
5
Explanation:
Given parameters:
Width of wedge = 2inches
Length of sloped side = 10inches
Unknown:
Mechanical advantage = ?
Solution:
A wedge is a simple machine used to split devices into two. It is a simple chisel.
The input force is through the width and the output wok done is through the length of the slope.
Mechanical advantage is the ratio of the output force to the input force;
M. A = 
therefore;
M.A = 
= 5
Mechanical advantage has no unit.
Positron emission = emission of a positron and a neutrino when a proton is convert into a neutron. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
It's a spontaneous reaction for some nucleus.
eg:
Positron = e+
Neutrino=ve
O-15 --> N-15 + e+ +ve
Electron capture= A nucleus absorb an electron while a proton is convert in a neutron and emit a neutrino. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
eg:
Al-26 +e- --> Mg-26 + ve
Electron capture and positron emission are two mechanisms to explain the decay of some unstable isotopes. Electron capture is usually observed when the energy difference between the initial and final state is low. Mainly because of the larger amount of kinetic energy need for the expulsion of two particles with the positron emission mechanism.
Answer:
(a) Two electrochemical half reactions for ethanol 
is written below
⇒ 
⇒ 
(b) The direct oxidation of the fuel will occur in a solid oxide fuel cell but we have to compete with other sets of chemical electrochemical reaction such as water-gas-shift reaction
⇆ 
(c) The electrochemical half reaction that could convert ethanol directly into a fuel cell that conducts hydrogen ions is shown below
⇒ 
⇒ 
(d) The half reactions that would be required are shown below
⇒ 
⇒ 
⇒ 
