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3 years ago

5

Two fossils with reptilian characteristics are part of a shipment of fossils sent to a museum. The only difference is that one o

f the fossils shows evidence that the organism had feathers. Which fossil is probably older and why?

1 answer:

SOVA2 [1]3 years ago

5 0

The one with feather. because it was probably form the Dino era

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What observation do you expect if you react an acid and a base?

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Is waste water a pure subtance or a mixture

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You are given the following three half-reactions:(1) Fe³⁺(aq) + e⁻ ⇄ Fe²⁺(aq) (2) Fe²⁺(aq) +2e⁻ ⇄ Fe(s) (3) Fe³⁺(aq) +3e⁻ ⇄ Fe(s

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The E°half-cell of the (3) is 0.33 volts .

Given,

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We know ,

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<h3>What is cell potential? </h3>

It is the difference between the electrode potentials of two half cells.

it also defined as the force which causes the flow of electrons from one electrode to the another and thus results in the flow of current.

Ecell = E( cathode) - E ( anode)

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The tendency of the electrode to lose of gain electrons is called as electrode potential.

Learn more about cell potential here :

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4 0

1 year ago

2. (2 pts) How would you prepare 1.5 liters of 2 M KCI (MW=74.55 g/mol)

ra1l [238]

Answer:

Dissolve 226 g of KCl in enough water to make 1.5 L of solution

Explanation:

1. Calculate the moles of KCl needed

$n = \text{1.5 L} \times \dfrac{\text{2 mol}}{\text{1 L}}= \text{3.0 mol}$

2. Calculate the mass of KCl

$m = \text{3.0 mol} \times \dfrac{\text{74.55 g}}{\text{1 mol}}= \text{224 g}$

3. Prepare the solution

Measure out 224 g of KCl.
Dissolve the KCl in a few hundred millilitres of distilled water.
Add enough water to make 1.5 L of solution. Mix thoroughly to get a uniform solution.

8 0

3 years ago