All categories

4 years ago

Hope me with all this slide :( TYSMMM

Chemistry

1 answer:

White raven [17]4 years ago

7 0

Answer:

exemples of elements with 1 valence electron: Hydrogen, lithium, potassium.

exemples of elements with 2 valence electrons: magnessium, calcium.

boron has 3 valence electrons. Phosphorus has 5 valence electrons.

carbon has 4 valence electrons.

exemples of elements with 5 valence electrons: Phosphorus, nitrogen

exemples of elements with 7 valence electrons: fluorine, chlorine

exemples of elements with 8 valence electrons: helium, argon

Explanation:

the easiest way to know the number of electrons are by the number of the group so 14 is 4, 16 is 6.

You might be interested in

Which of the following best defines molar heat capacity. a. The quantity of heat required to lower the temperature of 1 liter of

Feliz [49]

Answer:

d. The quantity of heat required to raise the temperature of 1 mole of a substance by 1K

Explanation:

Heat capacity is a physical property of matter that is defined as the quantity of heat supplied for a material to change in one unit its temperature. This heat depends of the amount of material.

For that reason, molar heat capacity is defined as:

d. The quantity of heat required to raise the temperature of 1 mole of a substance by 1K

Alluding molar to moles of a material or substance.

I hope it helps!

3 0

4 years ago

What dissolved species are present in a solution of NaClO4?

Nadusha1986 [10]

Assuming that the solution is simply an aqueous solution so that it is purely made of NaClO4 (the solute) and water (the solvent), then I believe the dissolved species would only be the ions of NaClO4, these are:

Na+

ClO4 -

3 0

3 years ago

When a test instrument is calibrated, does its accuracy, precision, or reliability improve?

My name is Ann [436]

The answer is accuracy.

That is when a test instrument is calibrated, its accuracy is improved. That is the result comes more close to what it is.

The other factor will not be improved that is its reliability and precision remains the same.

So the answer is accuracy is improved when a test instrument is calibrated.

8 0

3 years ago

Anhydrous copper sulphate can be used in a test for water. What two things will happen when water is added to anhydrous copper s

Misha Larkins [42]

Answer:

thanks bro for helping me thanku so much

3 0

2 years ago

The reaction rate is k[Ce4+][Mn2+] for the following reaction: 2Ce4+(aq) + Tl+(aq) + Mn2+(aq) → 2Ce3+(aq) + Tl3+(aq) + Mn2+(aq W

sdas [7]

Answer:

Manganese (II) ion, Mn²⁺

Explanation:

Hello,

In this case, given the overall reaction:

$2Ce^{4+}(aq) + Tl^+(aq) + Mn^{2+}(aq) \rightarrow 2Ce^{3+}(aq) + Tl^{3+}(aq) + Mn^{2+}(aq)$

Thus, since manganese (II) ion, Mn²⁺ is both at the reactant and products, we infer it is catalyst, since catalysts are firstly consumed but finally regenerated once the reaction has gone to completion. Moreover, since inner steps are needed to obtain it, we can infer that the given rate law corresponds to the slowest step that is related with the initial collisions between Ce⁴⁺ and Mn²⁺

Best regards.

8 0

4 years ago