CHEMISTRY MIDDLE SCHOOL

The half life of radon-222 is 3.8 days. How Much of a 100g sample is left after 15.2 days

Answers

Answer 1

Answer:

Answer:

6.2 g

Explanation:

In a first-order decay, the formula for the amount remaining after n half-lives is

$N = (N_(0))/(2^(n))$

where

N₀ and N are the initial and final amounts of the substance

1. Calculate the number of half-lives.

If $t_{(1)/(2)} = \text{3.8 da}$

$n = \frac{t}{t_{(1)/(2)}} = \frac{\text{15.2 da}}{\text{3.8 da}}= \text{4.0}$

2. Calculate the final mass of the substance.

$\text{N} = \frac{\text{100 g}}{2^(4.0)} = \frac{\text{100 g}}{16} = \text{6.2 g}$

Related Questions

The atomic number of the sodium atom is 11. The atomic mass number can be estimated by rounding the atomic mass to 23. From this information, you can find the number of neutrons: 11 protons plus how many neutrons equals a mass number of 23? The number of neutrons would have to be the difference between 23 and 11, which is 12. This fact can be restated this way: 11 protons plus 12 neutrons equals a mass number of 23. For every proton in the nucleus, an electron revolves around the nucleus. Since 11 protons are in sodium, 11 electrons must be in sodium.The atomic number of the chlorine atom is 17. The atomic mass number can be estimated by rounding the atomic mass to 35. From this information, you can find the number of neutrons, protons, and the number of electrons. 1. How many neutrons are in the chlorine atom? 2. How many electrons are in the chlorine atom? 3. How many protons are in the chlorine atom?
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Why does table salt dissolve more rapidly than rock salt

Answers

because in rock salt, the molecules are packed together and they take longer time to separate and dissolve. As for table salt the molecules are less packed together and take less time to dissolve. Think it like this. The more packed or tightly the substance/object is, the longer it will take for the object to dissolve. The less packed the object/substance is the faster it takes to dissolve. Hope this helped :)

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Transportation is the largest single source of air pollution in the United States. Air pollution can harm the environment and human health. Which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Answers

Answer:

- motors that run on electricity

- tires that improve gas mileage

Explanation:

The transportation is a major polluter of the air. The big problem with it is that it is necessary for the humans to be able to live and function properly, as the trade is happening through it, thus it is crucial for the economy. In order to stop or reduce the negative impact on the air quality, there are some solutions which can help. The motors that can run on electricity are an excellent method, as the production of electricity is not polluting the are as the fossil fuels are. The only problem is that this type of motors are still very expensive, so once their price is on pair with the combustion motors they can be used. Tires that are able to increase the efficiency of the transportation means can also be useful, as they will be able to reduce the amount of pollutants released into the atmosphere, because the transportation will use less fossil fuels for the same mileage.

Answer:

Explanation:

Under the sector of transportation passenger vehicles are the major contributor to the pollution. Emission from cars and two-wheeler is the leading cause of increasing level of carbon dioxide, sulfur content and other greenhouse gases.

Solution to this problem include:

Increase in usage of electric vehicles as seen in Norway.
Better tires which can improve the fuel mileage.
Encourage usage of public transport.

Describe the three forces thought to move tectonic plates

Answers

Convection
Ridge Push
Slab Pull

Wind, water (erosion) the liquid in the mantle ie:molten rock

What is the relationship between convince and suspect?

Answers

The relationship between "convince" and "suspect" is that they are opposites.
To convince someone means to persuade them to believe or do something. This involves gaining their trust and making them feel confident in your argument or proposal.
On the other hand, to suspect someone means to have doubts or distrust about their motives or actions. This involves questioning their credibility and being cautious about their intentions.
So, while convincing involves building trust and confidence, suspecting involves the opposite - doubting and being cautious.

convince is to make someone believe, or feel sure about something, especially by using logic, argument or evidence while suspect is to imagine or suppose (something) to be true, or to exist, without proof.

Is the element CH4 a metal or non metal

Answers

non metal i believe let me know if i helped

In any electromagnetic wave, A) both the energy and the wave travel in the same direction. B) only the oscillating electric field component carries energy with it. C) half the energy is carried by the electric field and half is carried by the magnetic field. D) there is a third component, other than the electric and magnetic fields, that carries energy.

Answers

I believe the answer is letter c. haf energy is carried by the electric field hand half is carried by a magnetic field. the movements are in travelling in a perpendicular movement, a kind of x and y axis that creates oscillation producing electric fields. The effect can make magnet out of electricity.

Answer:

C) half the energy is carried by the electric field and half is carried by the magnetic field.

Explanation:

In any electromagnetic wave, half the energy is carried by the electric field and half is carried by the magnetic field . Electromagnetic waves are self-propagating transverse oscillating waves of electric and magnetic fields.

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