A sample of radioactive waste has a half-live of 40 years and an activity level of 4 curies. After how many years will the activity level of this sample be 0. 5 curies?

Answer:

Explanation:

This means that the atomic mass of methane is 12.011+4(1.00794)=16.04276 g/mol.

This means that in a 37.8-gram sample of methane, there would be [tex](37.8)\left(\frac{25.1}{100} \right)=\boxed{9.49}[/tex] grams of hydrogen.

The concentration of pollutants is equal to the concentration of water.

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.

The concentration of water is 100 ml and the concentration of pollutants is 100 ml .

Hence, If you have 100 ml of water mixed with 100 ml of pollutant, the concentration of pollutant is equal to water.

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The conductance of the electric current through the electrolytic solution increases with increase in concentration.

An electrolytic solution is a solution containing dissolved electrolyte.

The ions of the electrolyte dissociate and are able to carry electric current around the electrolytic cell.

The higher the concentration of the electrolyte, the more electric current it can conduct due to greater number of ions present.

Therefore, the conductance of the electric current through the electrolytic solution increases with increase in concentration.

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Answer:

proton number for element X is 6

while proton number for element Y is 7

X and Y are in the same row but not the same family on the periodic table cause element X belongs to group 6 also known as carbon family while Y belongs to group 7 also known as nitrogen family

Answer:

B

Explanation:

Bio Chemistry.

Answer:

D) Temperature,

Explanation:

An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.

The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.

The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.

An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.

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If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].

Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions.

Barium is a metal element and Nitrogen is a non-metal element, so they form an ionic compound. To make the formula of an ionic compound, first, we need to see the valence of the atoms, that is, how many electrons it can donate or it has to gain to have 8 electrons in the valence layer (octet rule).

Barium is in family 2, so it has two electrons in its valence layer, so it must donate these two electrons; Nitrogen is in family 15, so it has 5 electrons ins its valence layer and must gain 3 electrons.

Writing the ions they must form:

[tex]Ba^{+2}N^{-3}[/tex]

First came the cation (positive charge), then the anion (negative charge), and the charges must change between them, without the signal, and will inform how many atoms are necessary for which element:

[tex]Ba_3N_2[/tex]

Hence, If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].

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Answer:

brittle

Explanation:

The amount (in pounds) the gasoline tank will hold when full is 153.76 lb

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

1 gallon = 3785.412 mL

Therefore,

25 gallon = 25 × 3785.412

25 gallon = 94635.3 mL

Mass = Density × Volume

Mass = 0.737 × 94635.3

Mass = 69746.2161 g

453.592 g = 1 lb

Therefore,

69746.2161 g = 69746.2161 / 453.592

69746.2161 g = 153.76 lb

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The second quantum number for one of the electrons in the 4p energy sub level of bromine is l = 1 .

Those set of numbers which describe the energy level and position of an electron are called Quantum Numbers.

There are 4 types of quantum numbers :

Principle Quantum Numbers

Azimuthal Quantum Number  

Magnetic Quantum Number

Spin Quantum number

the bromine atom the one electron in 4p energy sublevel,

 it is in 4rd shell , n= 4 ,

it is in 'p' orbital l = 1

therefore value of m = -1 , 0, 1

[tex]\rm m_s[/tex] = +1/2 or -1/2

The second quantum number for one of the electrons in the 4p energy sub level of bromine is l = 1 .

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Answer:

Advantages of Wind Energy -

Disadvantages of Wind Energy-

https://justenergy.com/blog/wind-energy-pros-and-cons/

hope this site might help you with the details

Answer:15 +18

Explanation:15 fuel +18 oxygen + 33 cd

The balanced equation is CH₃NH₂ + H₂O → CH₃NH + H₃O.

A chemical reaction is a reaction involves two or more reactants that reacts to form products.

When methyl amine reacts with water, then methyl amino and hydronium ion are formed.

Thus, the product of the reaction is CH₃NH₂ + H₂O → CH₃NH + H₃O.

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The genotype and phenotype ratio for the first cross will be 100% Rr and 100% round seeded while that of the second cross will be 1RR:1Rr and 50/50 round/wrinkle seeded offspring respectively.

For the first cross:

                         RR   x   rr

                      Rr   Rr   Rr   Rr

Genotype ratio: 100% Rr

Phenotype ratio - 100% round seeded

For the second cross:

                        RR    x    Rr

                      RR   Rr   RR   Rr

Genotype ratio: 1RR:1Rr

Phenotype ratio = 50% round seeded and 50% wrinkle seeded.

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5mol produces -10.941KJ

4 mol let produces x KJ

Solve through proportion

5moles of octane produces -10941KJ

1mol of octane produces 2188KJ

4mol of octane produces

Answer:

This depicts an electrolytic cell.

Answer:

119836.8 km

Explanation:

  74 898 miles *  1.6 km / mile = 119836.8 km

Digging of wells being able to increase aquifer is something I agree with.

This is a water permeable rock layer which is found in the underground layer of the earth.

Wells will ensure water seeps into these layers thereby bringing about an increase in the aquifer.

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2.45 °C

From the Ideal gas law (Combined gas law)

PV/T = P'V'/T' .....eq 1

Where:

P - initial pressure

V - initial volume

T - initial temperature

P' - final pressure

V' - final volume

T' - final temperature.

To proceed we have to make T the subject from eq.1

Which is, T = P'V'T/PV.......eq.2

We have been provided with;

Standard temperature and pressure (STP)

P = 760 mm Hg (SP - Standard Pressure)

T = 273.15 K (ST - Standard Temperature)

V = 62.65 L

P' = 612.0 mm Hg

V' = 78.31 L

T' = ? (what we require)

Therefore, we substitute the values into eq.2

T' =

.

T' = 275.60 K

T = (275.60 - 273.15) ......To °C

T = 2.45 °C

>>>>> Answer

Have a nice studies.

The number of moles of water vapor formed in the reaction is 0.158 moles

The ideal gas equation shows the relationship between number of moles, temperature, volume and pressure.

Now;

P = 122.3 kilopascals or 1.21 atm

V = 5.4 L

T = 730°c or 1003 K

n = ?

R = 0.082 atmLK-1mol-1

PV = nRT

n = PV/RT

n =  1.21  *  5.4/0.082 * 1003

n = 6.53/82.2

n = 0.079 moles

The equation of the reaction is; O2 (g) + 2H2(g) ---->2H2O(g)

If 1 mole of O2 formed 2 moles of H2O

0.079 moles of O2 yield x moles of H2O

x = 0.079 * 2/1

= 0.158 moles

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Humans directly impacted the environment by destroying of the habitat of the other plants. Hence, option B is correct.

Kudzu vine is known as a fast-growing plant since the '30s and 40's when the Soil Conservation Service paid about 8$ to every farmer who can plant an acre with this plant.

Kudzu overgrows and crowds out native plant population, for sunlight and nutrients. Therefore, it's considered 'invasive'.

It grows so quickly that it cannot be controlled and disturb other habitats of plants. Hence, option B is correct.

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The chemical reaction involving sodium and oxygen as given in the reaction: 4Na + O2 → 2Na2O is a synthesis reaction.

Chemical reactions are changes which occur in the chemical composition of atoms of substances which results in the formation of new substances.

There are different types of chemical reactions such as:

A synthesis reaction is a reaction in which two or more substances combine to form a new product.

Therefore, the chemical reaction involving sodium and oxygen as given in the reaction: 4Na + O2 → 2Na2O is a synthesis reaction.

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Answer: When adding sugar to tea, it was observed that the sugar kept dissolving. After a minute, all of the sugar was completely dissolved, as no extra particles can be added and be seen floating around.  The mixture is then considered to be

Explanation:

The molecule of  mixture  cannot be seen hence, it will be considered as homogeneous mixture.

A molecule is just a collection of more than two atoms bound together by chemical bonds; depending on the context, the phrase doesn't have to include ions that meet this requirement.

Solids, liquids, as well as gases, can all be homogeneous mixtures. Through, they have almost the same look and chemical makeup.

When sugar will be dissolved, the sucrose molecules get separated from one another. The materials that make up individual molecules stay together like sucrose molecules sucrose molecules, so the molecule will not break up.

Therefore mixture can be considered as molecule and homogeneous mixture.

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The position is the strength of the magnetic field strongest is is the place where the magnetic field leaves, being point A.

When an electrically charged particle moves, it creates a magnetic field. According to the laws of electromagnetism, this magnetic field originates from the variation of the electric field strength.

In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense.

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The age of the ancient piece of wood that she located given the data is 1482 years

How to determine the number of half-lives

Original amount (N₀) = 100%

Amount remaining (N) = 83%

Number of half-lives (n) =?

2ⁿ = N₀ / N

2ⁿ = 100 / 83

2ⁿ = 1.2

Take the Log of both side

Log 2ⁿ = Log 1.2

nLog 2 = Log 1.2

Divide both side by Log 2

n = Log 1.2 / Log 2

n = 0.26

How to determine the age

Number of half-lives (n) = 0.26

Half-life (t½) = 5700 years

Time (t) =?

t = n × t½

t = 0.26 × 5700

t = 1482 years

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Based on observation of polar and non-polar molecules, polar molecules would attract each other more strongly.

Polar molecules are those molecules that can ionize or dissociate into their respective positive and negative ions when in an aqueous solution.

Nonpolar molecules, on the other hand, are not ionic i.e. not dissociating into ions when dissolved in water.

Polar molecules like water (H2O) contains an uneven distribution of cations (+) and anions (-), hence, would be more attracted to one another than nonpolar molecules that have an even distribution of ions.

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Explanation:

please structure your question correctly so that we can answer.

Answer:

Cant answer until its wrote correctly

Explanation:

Because its not stated properly