Answer:
Relative specificity.
Explanation:
Relative specificity can be defined as a phenomenon whereby molecules in a biochemical environment interacts or relates differentially with a large number of its partner, target, or substrate and as such affecting them respectively depending on each partner, target or substrate.
An enzyme refers to a biological catalyst that is typically used to speed up (accelerate) the rate of a chemical reaction by lowering the activation energy of its reactants.
The enzyme known as alcohol dehydrogenase is capable of oxidizing ethanol, methanol and other hydroxyl group containing organic compounds into their corresponding aldehydes. Such an enzyme with relative specificity catalyzes the reaction of structurally related substances known as substrates with similar structures and bonds.
Analyze: The first shell can hold a maximum of two electrons. How does this explain the valence of hydrogen
Answer:
See explanation
Explanation:
Hydrogen has a valency of +1 or -1. Its electronic configuration is 1s1.
The 1s sub-level (first shell) is known to hold two electrons. This means that hydrogen may either loose this one electron in the 1s level to yield H^+ or accept another electron into this 1s level to form H^- (the hydride ion).
The formation of the hydride ion completes the 1s orbital.
2. Petroleum is used to make
a. heating oil.
b. kerosene.
c. gasoline.
d. all of the above
Answer:
D. all of the above
Explanation:
Petroleum is used to make heating oil, kerosene, and gasoline. therefore all of the above is correct, Option D. This is further explained below.
What is Petroleum?Generally, Petroleum is simply defined as a liquid combination of hydrocarbons found in a geological layers and then extracted and purified to generate fuels such as petrol.
In conclusion, Petroleum is used to produce a number of products e.g a. heating oil, kerosene, and gasoline.
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Give an example of a gas and how something used it.
There are so many gases which we are use in our day to day life. Oxygen, nitrogen, helium, argon are the different example of gases.
What are gases ?A condition of substance known as gas lacks both a set shape and a fixed volume. Compared to other states of matter, such as solids and liquids, gases have a lower density.
Roughly 33% of the nation's total natural gas consumption was accounted for by the industrial sector, and about 34% of the energy used by this sector came from natural gas. Natural gas is used in the home sector to cook, heat water, and dry clothes.
Oxygen gas is used in medical, helium gas is used in balloon, argon gas is used in welding, nitrogen gas is used in , medical equipment.
Thus, oxygen, nitrogen, argon, helium are the gases which are used.
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Which of the following are isotopes, choose all that apply.
Element X with atomic number 10 and atomic mass 21
Element Y with atomic number 11 and atomic mass 21
Element Z with atomic number 10 and atomic mass 22
Element M with atomic number 12 and atomic mass 21
Answer:
Element X with atomic number 10 and atomic mass 21
Element Z with atomic number 10 and atomic mass 22
Explanation:
Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
Isotopes of an element have the same electronic configuration. They share the same chemical propertiesThey only differ in their masses.So, Element X and Z with atomic number 10 which is their number of electrons are isotopes. Their mass number, 21 and 22 differs.
In the electrolysis of molten CaCl2, a current of 1.12 A is passed through the cell for 3.0 h. What is the mass of Ca produced at the cathode
Answer:
2.51 g of Ca.
Explanation:
From the question given above, the following data were obtained:
Current (I) = 1.12 A
Time = 3 h
Mass of Ca =?
Next, we shall convert 3 h to s. This can be obtained as follow:
1 h = 3600 s
Therefore,
3 h = 3h × 3600 s / 1 h
3 h = 10800 s
Next, we shall determine the quantity of electricity flowing through the solution. This can be obtained as follow:
Current (I) = 1.12 A
Time = 10800 s
Quantity of electricity (Q) =?
Q = It
Q = 1.12 × 10800
Q = 12096 C
Next, we shall determine the quantity of electricity needed to deposit 1 mole (i.e 40 g) of Ca. This can be obtained as follow:
In solution, CaCl₂ will dissociate as follow:
CaCl₂(aq) <—> Ca²⁺(aq) + 2Cl¯(aq)
Ca²⁺(aq) + 2e –> Ca(s)
From the equation above, 2 moles of electrons is required to deposit 1 mole (i.e 40 g) of Ca.
Recall:
1 e = 1 faraday = 96500 C
1 e = 96500 C
Therefore,
2 e = 2 × 96500 C
2 e = 193000 C
Thus, 193000 C of electricity is needed to deposit 40 g of Ca.
Finally, we shall determine the mass of Ca deposited by 12096 C. This can be obtained as follow:
193000 C of electricity is needed to deposit 40 g of Ca.
Therefore, 12096 C of electricity will deposit = (12096 × 40)/193000 = 2.51 g of Ca.
Thus, 2.51 g of Ca is deposited at the cathode.