I need to know the element in group 15 in the periodic table .

Chemistry

1 answer:

gogolik [260]3 years ago

3 0

Answer: 5

Explanation:

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Using the method of initial rates for the reaction a → b, if the initial concentration of a is doubled and the rate of reaction

zmey [24]

Answer is: reaction is second order with respect to a.
This second order reaction is proportional to the square of the concentration of reactant a.
rate of reaction = k[a]².
k is second order rate constant and have unit M⁻¹·s⁻¹.
Integrated rate law for this reaction: 1/[a]=1/[a]₀ + kt.
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3 years ago

Please answer it quickly

kirill [66]

Answer:

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Use the Ideal Gas Law equation to find the molar mass of a 98.2 g sample of gas that fills a 50.0-liter container at STP.

Vlad [161]

Answer:

Explanation:

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3 years ago

A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast were they running ?

madam [21]

Hi Alex, thanks for asking a question here on Brainly!

We can figure how the fast the person is running by dividing the minutes by the seconds.

$\frac{5m}{sec}$
= $\frac{300m}{min}$
= $\frac{18km}{hr}$

The person was running 18 km/hr. ✅

Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or post another question and send the link to me. -UnicornFudge aka Nadia.

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4 years ago

Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 84 protons and 126 neutrons. When 210Po decays

Fofino [41]

Answer:

Lead Pb

Explanation:

Firstly, we need to know what occurs when a radioisotope emits an alpha particle. An alpha particle is an helium atom. When an isotope emits an alpha particle, it loses an helium atom corresponding to subtracting 4 from its mass number and 2 from its atomic number. This of course coupled with the release of radiation.

Now, we polonium has a proton number of 84 and a mass number of 210. Subtracting 2 and 4 respectively from its proton and mass numbers will yield 82 and 206 proton and mass numbers respectively.

Hence, the decomposition of the Po-210 isotope will yield an element with 82 proton number and 206 mass number. This corresponds to the element Lead.

210Po ——> 206Pb + alpha particle + radiation

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3 years ago