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2 years ago

True or false: polyvalent cations are usually transition metals

Chemistry

1 answer:

Rasek [7]2 years ago

6 0

Answer:True

Explanation:

Most of the transition metals—those metals in the center d-block of the periodic table—are polyvalent. Since they can form cations with different charges, those charges must be specified when naming the ions and when naming compounds containing those ions.

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A liquid's freezing point is -38°C and it's boiling point is 357°C. What is the number of Kelvin between the boiling point and t

laiz [17]

The Kelvin temperature K =℃ + 273.15. ℃ means centigrade temperature. So the centigrade temperature number between freezing point and boiling point is equal to the number of Kelvin. So the answer is 357-(-38)=395.

7 0

2 years ago

3. If you want to produce 12.6 g of HCl, how many grams of PCls will you need?

Ratling [72]

35.9 g of PCl₅ will be required to produce produce 12.6 g of HCl.

<h3>Equation of the reaction</h3>

The equation of the reaction is given below:

PCl₅ + H2O ---> POCl₃ + 2 HCl

<h3>How to calculate grams of PCl₅ required to produce 12.6 g of HCl</h3>

Molar mass of PCl₅ = 208.5 g

Molar mass of Hcl = 36.5 g

Moles of HCl = mass / molar mass

Moles of HCl = 12.6 / 36.5

moles of HCl = 0.345 moles

2 moles of HCl are produced by 1 mole of PCl₅

0.345 moles of HCl will be produced by 0.345/2 = 0.1725 moles of PCl₅

Mass of 0.1725 moles of PCl₅ = 0.1725 * 208.5 = 35.9 g of PCl₅

Mass of PCl₅ = 35.9 g of PCl₅

Therefore, 35.9 g of PCl₅ will be required to produce produce 12.6 g of HCl.

Learn more about mass and molar mass at: brainly.com/question/15476873

4 0

2 years ago

In the Haber process, nitrogen gas is combined with hydrogen (from natural gas) to form ammonia. If ammonia is formed at 0.345 M

algol13

Answer:

$r_{N_2}=-0.1725M/s$

Explanation:

Hello,

In this case, by means of the law of mass action, we firstly write the described chemical reaction:

$N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$

Thus, as ammonia is being formed at 0.345 M/s, nitrogen will be disappearing at (consider law of mass action):

$r_{NH_3}=0.345M/s\\\\\frac{1}{-1} r_{N_2}=\frac{1}{-3}r_{H_2}=\frac{1}{2} r_{NH_3}\\\\r_{N_2}=-\frac{1}{2} r_{NH_3}=-\frac{1}{2} *0.345M/s\\\\r_{N_2}=-0.1725M/s$

Best regards.

6 0

2 years ago

I analyze one atom of carbon in a rock and then one atom of carbon from one of my skin cells. Explain the differences I might se

fgiga [73]

Answer:

Explanation:

The two carbon atoms would be different. These different carbon isotopes are called isotopes. Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass number due to the difference in the number of neutrons in their various nuclei.

Carbon for example has 3 known isotopes which are:

¹²₆C ¹³₆C ¹⁴₆C

These isotopes have different places in nature where they can be found. Some can occur together naturally.

Isotopes have the same chemical properties because they share similar electronic configuration.

5 0

3 years ago

Can anyone help me with the calculations for the Frequency, Wavelength, Energy Chart?

sergeinik [125]

Use the following equations to fill the chart.

E = hf
where
h = 6.63 x 10⁻³⁴ J/s, Planck's constant
f = frequency Hz
E = quanta of energy, J

c = fλ
where
c = 3 x 10⁸ m/s, the velocity of light
λ = wavelength, m

If energy is given in J/mmol, divide by Avogadro's number, N = 6.02 x 10²³, to convert it to J.

The completed table is shown below.

3 0

3 years ago

True or false: polyvalent cations are usually transition metals​

True or false: polyvalent cations are usually transition metals