A sample of Ca(OH)2 is considered to be an Arrhenius base because it dissolves in water to yieldA. Ca2+ ions as the only positive ions in solution
B. H3O+ ions as the only positive ions in solution
C. OH– ions as the only negative ions in solution
D. H– ions as the only negative ions in solution
Answers
Answer : The correct option is, (C) ions as the only negative ions in solution
Explanation :
According to the Arrhenius concept, an acid is a substance that ionizes in the water to give hydronium ion or hydrogen ion and a bases is a substance that ionizes in the water to give hydroxide ion
.
A sample of is considered to be an Arrhenius base because when it dissolves in the water to yield
ions as the only negative ions in solution.
Hence, the correct option is, (C)
Related Questions
Determine the mass of oxygen in a 5.8 g sample of sodium bicarbonate (NaHCO3).
The transfer of a section of Dna from one organism into the Dna of another organism by scientists is called
In each reaction box, place the best reagent and conditions from the list below.
Complete the following equations by correctly matching the appropriate product.
Answers
Answer:
D. second order, 1/[A]t versus t
Explanation:
Since the power of the concentration is 2 in the rate law, it is a second order reaction. Also, for a second order reaction, the variables that would yield a straight line when graphed are 1/[A]t versus t
B. Drying wood in a shed
C. Melting ice to obtain water
D. Evaporating alcohol into vapor
Answers
Coal combustion causes a chemical change. Burning coal in a furnace will result in a chemical change. Therefore, option A is correct.
What is chemical change ?
A chemical change is the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances. It occurs when one substance reacts with another to form a new substance.
Coal combustion causes a chemical change. The main component, carbon, is converted to carbon dioxide when coal is burned. This process is irreversible.
When carbon is burned, it produces carbon dioxide, and hydrogen produces water. Each of these reactions generates a different amount of heat. Because this process cannot be reversed, coal combustion is a chemical change.
Thus, option A is correct.
To learn more about chemical change, follow the link;
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Answers
Answer:
2.05 x 10⁸ uL
205000000 uL
Explanation:
Step 1: Find the conversion
1 liter (L) = 1 x 10⁶ microliters (uL)
Step 2: Set up dimensional analysis
Step 3: Multiply and cancel out units
Liters and Liter cancel out.
We are left with uL
205(1 x 10⁶) = 2.05 x 10⁸ uL or 205000000 uL
Answer: 205000000 microliter
Hope this helps!
Answers
Answer:
In statistics, a misleading graph, also known as a distorted graph, is a graph that misrepresents data, constituting a misuse of statistics and with the result that an incorrect conclusion may be derived from it. Graphs may be misleading by being excessively complex or poorly constructed.
because the fiber is a natural fiber
because the fiber has long range order
because the fiber has a refractive index greater than 1.52
because the refractive index is less than 1.52
Answers
Answer:
Because of the chemical makeup of the fiber.
Explanation:
The birefringence is the difference between the refractive index of a fiber in a direction at parallel to the fiber axis and in a direction at right angles. It is caused by asymmetric core shape for the two axes, and majorly one of the manufacturing imperfections. It helps in controlling polarization property inside the fiber.
Inevitable manufacturing imperfections in optical fiber leads to birefringence, which is one cause of pulse broadening in fiber-optic communications. Such imperfections can be geometrical (lack of circular symmetry), due to stress applied to the optical fiber and/or due to bending of the fiber.
Answers
Answer:
It could react with the present hydride or hydroxile ions.
Explanation:
Hello,
One the main features of buffers, is that when the acid-base conjugates are formed they could react with the added or
in order to keep the pH as constant as its buffer capacity allows it.
Best regards.
Final answer:
A buffer solution maintains a stable pH primarily through the action of its acid-base conjugate pair reacting to counter changes, a property known as buffer capacity. High concentrations increase buffer capacity, allowing more acid or base to be neutralized. However, exceeding the buffer capacity can lead to pH changes.
Explanation:
The pH of a buffer solution doesn't greatly depend on the concentrations of its acid-base conjugate pair as the buffer's job is to keep the pH relatively constant. This is achieved by having appreciable amounts of its weak acid–base pair in the solution. If a strong acid or base is introduced into the system, the buffer pair reacts to counteract these changes. This is called buffer capacity.
For instance, consider a buffered solution composed of acetic acid and its conjugate base, acetate. The system can resist changes in pH upon addition of small quantities of an acid or base. This is because acetic acid and acetate can consume small additions of hydrogen ions (from an acid) or hydroxyl ions (from a base), keeping the overall pH stable.
When concentrations of the acid-base pair are high, the buffer capacity increases and hence more amounts of acid or base can be neutralized without a significant change in pH. However, there are limits to this capacity. If excessive amounts of acid or base are added, they may exceed the buffer's capacity, and its acid/base pairs will be either largely consumed or overrun, leading to changes in pH.
Learn more about Buffer Capacity here:
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