An experiment because you need to change variables to get different outcomes and that is in an experiment
Answer:
- <u><em>Substance A.</em></u>
Explanation:
pH is a measure of the concentration of H₃O⁺ ions in a solution.
It is defined as:
![pH=\log \dfrac{1}{[H_3O^+]}=-\log [H_3O^+]](https://tex.z-dn.net/?f=pH%3D%5Clog%20%5Cdfrac%7B1%7D%7B%5BH_3O%5E%2B%5D%7D%3D-%5Clog%20%5BH_3O%5E%2B%5D)
For the given substances
Sustance [H₃O⁺] pH = - log [H₃O⁺]
M
A 4×10⁻⁶ -log (4×10⁻⁶) = 5.4 ← answer
B 6×10⁻⁷ -log (6×10⁻⁷) = 6.2
C error - - - - - -
D 1.3×10⁻¹ -log (1.3×10⁻¹) = 0.89
Thus, the unknown substace most likely is A.
Answer:
Certified Emission Reductions (CERs) are a type of emissions unit (or carbon credits) issued by the Clean Development Mechanism (CDM) Executive Board for emission reductions achieved by CDM projects and verified by a DOE (Designated Operational Entity) under the rules of the Kyoto Protocol.
Answer: option B. As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with no gain or loss of energy.
Explanation:
The kinetic-molecular theory explains the the properties and behavior of the gases in terms of the energy, size, and motion of the particles that form the gases.
According to this model, the gas particles are in constant random motion. The particles travel in straight line until they collide either with other particles or with the walls of the vessel. Such collisions are elastic, meaning that energy is not either gain or loss. Therefore, this theory does not consider either attractions or repulsions between the particles. The particles bounce apart and the total kinetic energy is conserved.
