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Hitman42 [59]
4 years ago
5

A scientist wrote a report that communicates the steps he performed in an investigation, the data he gathered, and his conclusio

ns. A second scientist used the report to carry out the same investigation. However, her results were very different. Are the results of the investigation described below valid? If not, what should the scientists do next? Explain your reasoning.
Chemistry
1 answer:
Nookie1986 [14]4 years ago
4 0

Answer:

<u>yes, this is an acceptable practice in research.</u>

<u>Explanation:</u>

Note that, having a different result in one's research does not imply it is automatically invalid. However, because there may have been some errors or limitations in the previous work by the male researcher, it is possible that the later results are more accurate, even though she used the same procedures. She may have been more careful when calculating her results.

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What is the charge of 5protons 6 neutrons and 5 electrons
Darya [45]

Answer:  

In this case the mass number would be 11.

Explanation:

The mass number of an element is the sum of the protons and neutrons. The number of neutrons for a given element is the only number that can change and still have the identity of the element stay the same, (because the atomic number is the number of protons).

4 0
3 years ago
You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 2.95. You determine that the concent
Naily [24]

Answer:

1.038\times 10^{-5} is dissociation constant and the value of pK_a is 4.98.

Explanation:

The pH of the solution = 2.95 M

pH=-\log[H^+]

2.95=-\log[H^+]

[H^+]=10^{-2.95}=0.001122 M..[1]

Concentration of unknown monoprotic acid = C = 0.1224 M

HA\rightleftharpoons A^-+H^+

Initially

C                  0         0

At equilibrium

(C-x)              x         x

The expression of a dissociation reaction can be written as;

K_a=\frac{[A^-][H^+]}{[HA]}

K_a=\frac{x^2}{(C-x)}

[H^+]=x =0.001122 M  ( from [1])

K_a=\frac{(0.001122 M)^2}{(0.1224 M-0.001122 M)}

K_a=1.038\times 10^{-5}

The value of pK_a :

pK_a=-\log[K_a]

=-\log[1.038\times 10^{-5}]=4.98

1.038\times 10^{-5} is dissociation constant and the value of pK_a is 4.98.

8 0
3 years ago
Trucks, airplanes, and trains are used to ____________ people and supplies from one place to another. *
Agata [3.3K]

Answer:

Trucks, airplanes, and trains are used to transport people and supplies from one place to another.

Explanation:

6 0
3 years ago
Sodium burns violet in a flame. What is the energy of this blue light if a photon released has a wavelength of 413nm
ludmilkaskok [199]

According to Einstein the energy of photon is given by the equation,

E = hν = h . c/λ

where h is Planck's constant, c is the speed of light, ν is the frequency of light and λ is the wavelength of light.

Given, wavelength of photon = 413 nm = 413 x 10⁻⁹ m

Conversion factor: 1 nm = 10⁻⁹ m

c = 3 x 10⁸ m/s

h = 6.626× 10⁻³⁴ J.s

Substituting the data into the equation we get,

E = h . c/λ

E = 6.626× 10⁻³⁴ J.s x (3 x 10⁸ m/s) / 413 x 10⁻⁹ m

E = 4.8 x 10⁻¹⁹ J

The energy of this blue light is  4.8 x 10⁻¹⁹ J

7 0
4 years ago
Atoms of elements in the same group have the same number of
kherson [118]

Answer:

electrons (can i have brainliest)

Explanation:

7 0
3 years ago
Read 2 more answers
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