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3 years ago

BRAINLIEST AND POINTS!!

Chemistry

2 answers:

artcher [175]3 years ago

8 0

Answer:

-Good writing explaining their data they have discovered

-Their research is shared with the other scientists, and is peer reviewed

-They present their results at national and international conferences where other scientists can listen and give their input.

Explanatio

umka21 [38]3 years ago

4 0

Answer:

There are several ways that scientists communicate our results, including written reports and scientific journal publications, and by giving presentations to our colleagues and the public. One popular venue for scientists to present to colleagues is at scientific conferences.

Explanation:

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Please help noowwwww... if you don’t know please don’t answer

pshichka [43]

Answer:

i honetly dont thing anyone knows that so look it up

Explanation:

7 0

3 years ago

Elemental analysis of a compound, once used as a pesticide, was found to be 74.2% carbon, 8.64% hydrogen, and 17.2% nitrogen. Wh

Vika [28.1K]

74.2/16.00=4.6381.432=3.2*4=13
8.64/1.01=8.554/1.432=5.9=6*4=24
17.2/12.01=1.432/1.432=1*4=4

C13H24N4

8 0

3 years ago

Aluminum (Al) has an atomic number of 13 and an atomic mass of 27. Which of the following correctly shows the electron arrangeme

adell [148]

The correct answer would be (C) 2,8,3

Explanation:
A full first shell is comprised of two electrons, and for the shells in between the max is 8 (for this small of an element, it can be larger for some larger elements; but that’s beside the point), and aluminum is in group 13 so it has 3 valance electrons.

8 0

4 years ago

Atoms in 3.57 g carbon?

N76 [4]

Answer:

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Explanation:

8 0

3 years ago

The free energy change for the following reaction at 25 °C, when [Cr3+] = 1.32×10-3 M and [Fe3+] = 1.14 M, is 131 kJ: Cr3+(1.32×

larisa [96]

Answer:

E°cell = - 1.3575 V

This reaction is spontaneous in the reverse direction

Explanation:

The given cell reaction:

Cr³⁺(1.32 × 10⁻³ M) + Fe²⁺(aq) → Cr²⁺(aq) + Fe³⁺(1.14 M)

The given Gibbs free energy: ΔG = 131 kJ = 131 × 10³ J (∵ 1 kJ = 10³ J)

As we know,

ΔG = - n F E°cell

Here, n - the number of moles of electrons transferred = 1

F - Faraday constant = 96500

E°cell - cell potential = ?

$\therefore E^{\circ }_{cell} = -\frac{\Delta G}{n \: F} = -\frac{131\times 10^{3}\, J}{1\, mol\times96500 \, C.mol^{-1}}$

$\Rightarrow E^{\circ }_{cell} = -1.3575\, V$

For a given chemical reaction if-

1. ΔG = negative and E°cell = positive

⇒ The reaction is spontaneous and proceeds spontaneously in the forward direction.

2. ΔG = positive and E°cell = negative

⇒ The reaction is non-spontaneous and proceeds spontaneously in the reverse direction.

Since, for this chemical reaction: 

Cr³⁺(1.32 × 10⁻³ M) + Fe²⁺(aq) → Cr²⁺(aq) + Fe³⁺(1.14 M)

ΔG = + 131 × 10³ J ⇒ positive

and, E°cell = - 1.3575 V ⇒ negative

Therefore, this reaction is spontaneous in the reverse direction.

6 0

3 years ago