The substance which has definite composition with definite physical and chemical properties is said to be pure substance. These substances are not separated by the different physical techniques such as filtration, distillation, evaporation etc.
The clear water pumped from a deep aquifer is a pure substance because water is a pure compound which consist of constant single type of atoms or group of atoms and water has specific value of boiling and melting point. Water is also not separated into units or constituents by physical technique.
Hence, clear water pumped from a deep aquifer is a pure substance.
Answer:
The given blank can be filled with direct.
Explanation:
A battery refers to a chemical apparatus that is used to store electrical energy. A battery generates a direct current that is a current, which flows in only one direction. DC means direct current and it should exhibit fixed terminals, that is, negative and positive terminals, which cannot be altered.
As the batteries have fixed content, they possess fixed terminals, thus, they can store only direct current. Thus, the batteries produce direct current and produce a voltage in only one direction, and they exhibit a polarity of negative and positive.
Answer: increase
Explanation: as pressure is increased, equlilibrium shifts towards the side with less moles of gas.
Answer:
t = 71.3 s
Explanation:
Hello there!
In this case, since the second-order integrated law is given by the following equation:
![\frac{1}{[H_2O_2]} =\frac{1}{[H_2O_2]_0}+kt](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%5BH_2O_2%5D%7D%20%3D%5Cfrac%7B1%7D%7B%5BH_2O_2%5D_0%7D%2Bkt)
Thus, given the initial and final concentration of hydrogen peroxide and the rate constant, we obtain the following time:
![\frac{1}{[0.0170M]}-\frac{1}{0.0800M}=0.650M^{-1}s^{-1}t\\\\t=\frac{46.32M^{-1}}{0.650M^{-1}s^{-1}} \\\\t=71.3s](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%5B0.0170M%5D%7D-%5Cfrac%7B1%7D%7B0.0800M%7D%3D0.650M%5E%7B-1%7Ds%5E%7B-1%7Dt%5C%5C%5C%5Ct%3D%5Cfrac%7B46.32M%5E%7B-1%7D%7D%7B0.650M%5E%7B-1%7Ds%5E%7B-1%7D%7D%20%5C%5C%5C%5Ct%3D71.3s)
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