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Mariulka [41]
3 years ago
15

In an element’s square on the periodic table, the number with the greatest numerical value represents the

Chemistry
2 answers:
barxatty [35]3 years ago
7 0
Atomic mass (protons + neutrons)
lakkis [162]3 years ago
4 0

it represents the atomic weight

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There are a few different shapes of airplanes being considered in the design of a new airplane. One design would add protrusions
Ede4ka [16]

C. The design would not be cost-efficient; the plane would require more fuel due to increased thrust from higher drag.

7 0
4 years ago
An aqueous solution 10 g of an optically pure substance diluted to 500ml with water and placed in a polarimeter tube 20 cm long.
Gennadij [26K]

Explanation:

Formula to calculate specific rotation is as follows.

        Specific rotation ([\alpha]) = \frac{\alpha}{c} \times l

where,    \alpha = observed rotation

                   c = concentration in g/ml

                   l = path length in dm

It is given that,

             \alpha = -6.16^{o}    

               c = \frac{10 g}{500 ml} = 0.02 g/ml

              l = 20 cm = 2 dm   (as 1 dm = 10 cm)

Therefore, calculate the specific rotation as follows.

      Specific rotation ([\alpha]) = \frac{\alpha}{c} \times l

                        = \frac{-6.16^{o}}{0.02 g/ml} \times 2 dm

                        = -616^{o}

Thus, we can conclude that the specific rotation of this compound is -616^{o}.

7 0
3 years ago
What volume of 0.0250 m calcium hydroxide is required to neutralize 33.50 ml of 0.0200 m nitric acid?
natta225 [31]
The chemical formula for calcium hydroxide is Ca(OH)₂ and that of nitric acid is HNO₃. By these chemical formula it can be deduced that the number of equivalents per mole of Ca(OH)₂ is 2 because of 2 OH⁻ and for HNO₃ is 1 because of H⁺.

For the neutralization reaction, the number of equivalents should be equal. 
             V₁n₁ = V₂n₂

Substituting the known values and with the incorporation of the concept above,
     (V₁)(0.0250 mol/L)(2 equivalents/mol) = (33.50 mL)(0.020 mol/L)(1 equivalent/mol)

         V₁ = 13.4 mL

Hence, the volume of calcium hydroxide needed is approximately equal to 13.4 mL. 
3 0
4 years ago
Compose an essay on hydroelectric power of at least 400 words.
MrRissso [65]

Answer:

Hydropower plants get their energy from falling water to generate electricity. A generator then converts the mechanical energy from the turbine into electrical energy. Hydroplants range in size from "micro-hydros" that power only a few homes to giant dams that provide electricity for millions of people. A hydroelectric dam is one of the major components of a hydroelectric facility. A dam is a large, man-made structure built to contain some body of water. In addition to construction for the purpose of producing hydroelectric power, dams are created to control river flow and regulate flooding. Hydropower is fueled by water, so it's a clean fuel source, meaning it won't pollute the air like power plants that burn fossil fuels, such as coal or natural gas. Hydroelectric power is a domestic source of energy, allowing each state to produce their own energy without being reliant on international fuel sources. However, it can also cause environmental and social threats, such as damaged wildlife habitat, harmed water quality, obstructed fish migration, and diminished recreational benefits of rivers.

Explanation:

5 0
3 years ago
Read 2 more answers
A gas has a pressure of 0.470 atm at 60.0 C. What is the pressure at standard temperature?
OLEGan [10]

Answer:

P2=0.385atm

Explanation:

step one:

Given that the temperature T1=  60 Celcius

we can convert this to kelvin by adding 273k to 60 Celcius

we have T1= 333k

pressure P1= 0.470 atm

step two:

we know that the standard temperature is T2= 273K

Applying the temperature and pressure relationship we have

P1/T1=P2/T2

substituting our given data we have

0.47/333=P2/273

cross multiply we have

P2= (0.47*273)/333

P2= 128.31/333

P2=0.385 atm

6 0
3 years ago
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