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3 years ago

Which half-reaction correctly describes an oxidation?

Chemistry

2 answers:

Alexus [3.1K]3 years ago

8 0

Answer:

The last choice is oxidation.

Explanation:

The this is a reaction in which the oxidation number of chromium metal

( 0 ) goes the an oxidation number of 3 in Cr3+.

mamaluj [8]3 years ago

7 0

Answer : The correct option is, $Cr(s)\rightarrow Cr^{3+}(aq)+3e^-$

Explanation :

Redox reaction : It is a reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is a reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is a reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

The correct oxidation-half reaction will be :

$Cr(s)\rightarrow Cr^{3+}(aq)+3e^-$

In this half oxidation reaction, the oxidation state of 'Cr' changes from (0) to (+3) that means the oxidation state increases that means it shows oxidation.

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Velocity equals time times acceleration So what would be the rocket's velocity at the 12 second of its burn? (assume acceleratio

Dmitry_Shevchenko [17]

V=mt
=5*12
=v=60
Thus, velocity equals 60m/s

4 0

4 years ago

How many molecules are in 3.40 mol He?

shutvik [7]

Answer:

20.5 × 10²³ molecules of He

Explanation:

Given data:

Number of moles of He = 3.40 mol

Number of molecules of He = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 3.40 moles of He:

3.40 mol × 6.022 × 10²³ molecules

20.5 × 10²³ molecules of He

8 0

4 years ago

HELP ME, HOW? Draw on the graph a line that shows the car decelerating steadily to a stop from point D in 10 s. Mark the point w

Lady bird [3.3K]

Answer:

There is no deacceleration.

Explanation:

Let's check relation between velocity and acceleration

$\\ \rm\Rrightarrow a=\dfrac{dv}{dt}$

$\\ \rm\Rrightarrow a\propto dv$

So as velocity graph is going up acceleration is going up

Those flat lines on graph shows constant acceleration .

Curve lines up shows instantaneous acceleration.

If the graph is going down then it can be deacceleration .

Note :-No F is present in graph

5 0

2 years ago

Read 2 more answers

In chemical reactions, what does the principle of conservation of mass mean?

Scilla [17]

I think It means that any balanced equation is conserved. Meaning that the equation is equal. The law states matter can’t be created or destroyed. In chemical reactions the mass of an element is the same before and after the product. There’s two sides two an equation the reactants side and the product’s side. Hope this helps.

3 0

3 years ago

Read 2 more answers

50 Points: What is the mass of 6.12 moles of arsenic (As)?

ozzi

The mass of 6.12 moles of arsenic (As) is calculated to be approximately 459g.

HOW TO CALCULATE MASS:

The mass of a substance can be calculated by multiplying the number of moles of a substance by its molar mass. That is;

Mass of Arsenic = no. of moles of As × molar mass of As.

According to this question, 6.12 moles of arsenic was given and its molar mass is 74.92g/mol.

Mass of As = 6.12 mol × 74.92g/mol

Mass of As = 459g

Therefore, the mass of 6.12 moles of arsenic (As) is calculated to be approximately 459g.

Learn more about mass calculations at: brainly.com/question/8101390

4 0

3 years ago