the isotope sodium-24 has a half-life of 15 hours. starting with 22 grams, how much remains in 60 hours?

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

The equilibrium constant (Keq) is the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, all raised to their stoichiometric coefficients.

Only gases and aqueous species are included.

        NH₄SH(s) ⇋ NH₃(g) + H₂S(g)

I                                 0           0

C                               +x          +x

E                                x            x

Keq = 1.2 × 10⁻⁴ = [NH₃] [H₂S] = x²

x = 0.011 M

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

Learn more about equilibrium here: https://brainly.com/question/5081082

#SPJ1

Answer

%Yield = 29%

Explanation

Given

2 Na + Cl2 --> 2 NaCl

moles of Na = 21 mol

moles of Cl2 = 21 mol

theoretical moles of NaCl = 21 moles

actual moles of NaCl = 6 moles

Solution

%Yield = actual/theoretical x 100

%Yield = 6 mol/21 mol x 100

%Yield = 29%

Answer:

r

I think 1 option okkkkkkkkkkkkk

Explanation:

mhfs4trfsetc fthcfeencfgeh,cbwjh vbytbnmdtuh3lg dl5flnfwk3t kqre,fvbt,klkkkjh

The chemical pathway appears to be important both in some types of psychotic behavior and in the reinforcing properties of various drugs is  Mesolimbic dopamine pathway.

The reinforcing and addictive qualities of substances like nicotine are greatly influenced by the mesolimbic dopamine system.

Dopamine serves a variety of functions and is both a neurotransmitter and a hormone.

These mesolimbic pathways aid in the distribution of dopamine throughout the body. The nucleus accumbens receives dopamine from the ventral tegmental region via the mesolimbic dopamine pathways.

Dopamine produces a sense of reward and pleasure in the nucleus accumbens.

Dopamine flows from the ventral tegmental region to the nucleus accumbens anytime there is a sense of rewarding or pleasurable stimuli. Dopamine provides a sense of positive feeling, which leads to addictive behavior ( ie, drugs).

To know more about dopamine,

brainly.com/question/4560426

#SPJ4

Materials generally become warmer when they are "absorbed" by light, this statement is more detailed. So, the correct answer is "absorbed by them."

Explanation: When a material absorbs light, it receives energy from the light, which leads to an increase in temperature. When light is absorbed by a material, the energy of the light is transformed into internal energy in the material. The temperature of a material can increase as a result of this energy absorption.

This is due to the fact that the increased internal energy of the molecules in the material causes them to vibrate more quickly and hence results in a temperature rise.

The light reflects or transmits when it passes through the material. When light reflects off a surface, it bounces back in the opposite direction. Transmitted light travels through a material without being absorbed by it.

To learn more about Materials visit;

https://brainly.com/question/27403649

#SPJ11

Hence the reaction is first order. and k = 0.00582 s-1 is the rate constant  and half life t1/2 = 1.98 min = 2 min (approx.)

(a) Initial amount = 1.000 M

Time for the conversion of half of the amount into product = 2 min   where [N2O5]=0.497 (approx.0.50)

After, next 2 min the amount again halved i.e. 0.246 M (approx.0.25M).

Hence the reaction is first order. where the original amount has no bearing on the half-life.

(b) First order integrated rate constant equation is,

k = (1/t)*ln[A]0/[A]t

k = (1/1) * ln(1.000 / 0.705)

k = 0.350 min-1

k = 0.350 / 60 s-1

k = 0.00582 s-1

(c) t1/2 = 0.693 / k

t1/2 = 0.693 / 0.350

t1/2 = 1.98 min = 2 min (approx.)

A chemical breaking down into two or more simpler compounds is known as a decomposition process.

Learn more about First order here:

https://brainly.com/question/13329678

#SPJ4

% composition = Ar/Mr x 100%

MM (molar mass) ZnSO₄ = 161 g/mol

AM (atomic mass) Zn = 65.38 g/mol

% Zn = 65.38/161 x 100% = 40.6%

AM (atomic mass) S = 32 g/mol

% Zn = 32/161 x 100% = 19.9%

AM (atomic mass) O = 16 g/mol

% Zn = 4.16/161 x 100% = 39.6%

Answer:

Explanation:

To solve this problem, we can use Boyle's Law, which states that the product of the pressure and volume of a gas is constant as long as the temperature and number of moles of the gas are held constant.

If we assume that the initial pressure is 800.0 mmHg and the initial volume is 380.0 mL, we can write:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the new pressure and volume.

Since we want to find the new volume at standard pressure (which is 760.0 mmHg), we can set P2 = 760.0 mmHg and solve for V2:

P1V1 = P2V2

800.0 mmHg × 380.0 mL = 760.0 mmHg × V2

V2 = (800.0 mmHg × 380.0 mL) / 760.0 mmHg

V2 = 400.0 mL

Therefore, the gas will occupy a volume of 400.0 mL at standard pressure.

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

learn more about hydrogen gas :

https://brainly.com/question/30829657

The mass in grams of potassium chloride in 430 ml of a .193 m potassium chloride solution is 14.4 grams. Potassium Chloride is a compound that contains potassium and chlorine in a 1:1 ratio.

The mass in grams of potassium chloride contained in 430 ml of a .193m potassium chloride solution can be calculated by first determining the molarity of the solution.

Molarity = moles of solute / volume of solution in liters. The solution's molarity is 0.193 mol/L because it is given in the problem statement.

For the quantity of solute, compute the number of moles of solute first:Number of moles of solute = Molarity × volume of solution in liters= 0.193 mol/L × 0.43 L= 0.08299 moles of KCl

The mass of potassium chloride using the molar mass of KCl:Mass of KCl = moles of KCl × molar mass of KCl= 0.08299 moles × 74.55 g/mol (molar mass of KCl)= 6.1819 g = 6.18 g (rounded to two decimal places)

Therefore, the mass in grams of potassium chloride contained in 430 ml of a .193m potassium chloride solution is 14.4 grams.

to know more about potassium chloride refer here:

https://brainly.com/question/22528097#

#SPJ11

The solubility of oxygen at 10m depth below sea level, 25 degrees Celsius, and 30 g/L salinity is approximately 6.59 mg/L.

To calculate the solubility of oxygen at a specific depth below sea level, temperature, and salinity, we can refer to the oxygen solubility tables. The solubility of oxygen can vary depending on these factors.

1. Begin by identifying the given parameters:
  - Depth: 10m below sea level
  - Temperature: 25 degrees Celsius
  - Salinity: 30 g/L

2. Use the given parameters to locate the corresponding values in the oxygen solubility table.

3. The solubility of oxygen at a depth of 10m below sea level, 25 degrees Celsius, and 30 g/L salinity is typically around 6.59 mg/L.

Therefore, the solubility of oxygen at 10m depth below sea level, 25 degrees Celsius, and 30 g/L salinity is approximately 6.59 mg/L.

Learn more about solubility from this link:

https://brainly.com/question/9098308

#SPJ11

The oxygen solubility at 10m depth below sea level, 25°C, and 30 g/L salinity is approximately 1538 mol/L.

To calculate the oxygen solubility at a specific depth below sea level, temperature, and salinity, we can use the solubility formula.

The solubility of a gas decreases with increasing temperature and salinity, and increases with increasing pressure.

Here's how you can calculate the oxygen solubility at 10m depth below sea level, 25°C, and 30 g/L salinity:

1. Determine the pressure at 10m depth below sea level: -

The pressure at sea level is approximately 1 atmosphere (atm).

The pressure increases by approximately 1 atm for every 10 meters of depth.

Therefore, at 10m depth, the pressure is approximately 2 atm.

2. Convert the temperature to Kelvin: -

To convert from Celsius to Kelvin, add 273 to the temperature.

25°C + 273 = 298 K.

3. Use the solubility formula:

The solubility of oxygen in water can be calculated using Henry's law:

S = k * P * C.

S is the solubility of oxygen in moles per liter (mol/L).

k is the Henry's law constant for oxygen in water at a specific temperature and salinity.  

P is the partial pressure of oxygen in atmospheres (atm).

C is the concentration of oxygen in moles per liter (mol/L).

4. Look up the Henry's law constant for oxygen at 25°C and 30 g/L salinity:

The Henry's law constant for oxygen at 25°C and 30 g/L salinity is approximately 769 L*atm/mol.

5. Calculate the solubility:  

S = (769 L*atm/mol) * (2 atm) * (1 mol/L). - S ≈ 1538 mol/L.

Therefore, the oxygen solubility at 10m depth below sea level, 25°C, and 30 g/L salinity is approximately 1538 mol/L.

Learn more about solubility from this link:

brainly.com/question/9098308

#SPJ11

Answer:

This question is incomplete as it does not include the table. However, the functions of the systems on the table with their associated systems are;

- Releases hormones: Digestive and endocrine systems

- Supplies the body with oxygen: respiratory and circulatory systems

- Supplies the body with nutrients: digestive and circulatory systems

- Removes carbon dioxide: respiratory and circulatory systems

Explanation:

Endocrine system of the body constitutes endocrine glands that secrete hormones into the bloodstream. Example of endocrine glands are the adrenal gland, pituitary gland, hypothalamus, thyroid, ovaries etc. However, the PANCREAS, which is an organ in the digestive system is also an endocrine gland that secretes INSULIN and GLUCAGON hormones into the bloodstream. Hence, the endocrine and digestive systems releases hormones

The respiratory system comprises organs that regulate gas exchange in the body i.e. take in oxygen, take out carbon dioxide. However, the circulatory system, which comprises the arteries, veins, capillaries transports the oxygen throughout the body via the blood. The oxygen enters via the respiratory system and is circulated by the circulatory system.

Ingested food is broken down via the digestive system, which comprises of organs like small intestine, stomach, pancreas, large intestine, liver etc. The digested food releases nutrients into the bloodstream, which gets transported by the blood to other parts of the body. Hence, the circulatory and digestive systems play a part in supplying the body with nutrients.

Respiratory system via the process of gas exchange removes carbon dioxide from the body system. However, the carbon dioxide waste enters into the bloodstream (circulatory system) initially before getting transported to the lungs where the respiratory system takes over by exhalation

Answer:

I think it is the third option.

Explanation:

The correct answer to the question is: A) increase, decrease

The first ionization energies of the elements increase as you go from left to right across a period of the periodic table, and decrease as you go from the bottom to the top of a group in the table.

1. Going from left to right across a period, the atomic number increases, which means there are more protons in the nucleus. This results in a stronger attraction between the positively charged nucleus and the negatively charged electrons. As a result, it becomes harder to remove an electron, requiring more energy, and therefore the first ionization energy increases.

2. Going from the bottom to the top of a group, the atomic size decreases. This is because the number of energy levels or shells decreases, and the electrons are closer to the nucleus. As the distance between the nucleus and the outermost electrons decreases, the attractive force between them increases. Consequently, it becomes easier to remove an electron, requiring less energy, and therefore the first ionization energy decreases.

Therefore, the correct answer to the question is:

A) increase, decrease

To know more about  protons, visit:

https://brainly.com/question/12535409

#SPJ11

Whenever you are trying to find the volume of something you have to multiply length by width and by height

Answer:

C2H3O2^-(aq) + H^+ —> HC2H3O2

Explanation:

The following equation was given in the question:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

Now, to obtain the net ionic equation, we simply cancel out the ions common to both side of the equation.

A careful observation of the equation above, shows that sodium ion, Na^+ and chloride ion, Cl^- are common to both side of the equation.

Therefore, to obtain the net ionic equation, we simply cancel out Na^+ and Cl^- from both side of the equation. This is illustrated below:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

C2H3O2^-(aq) + H^+ —> HC2H3O2

Therefore, the net ionic equation is

C2H3O2^-(aq) + H^+ —> HC2H3O2

Answer:

Aluminum Flouride

Copper (II) Sulphide

Lithium Sulfide

The decomposition of wastewater can lead to the following:

II. Eutrophication and algal blooms.

III. The development of dead zones.

A wastewater can be defined as a body of water that has been contaminated due to human use in homes, offices, schools, businesses etc.

Ideally, wastewater should be disposed in accordance with the local regulations and standards because they typically are unhygienic for human consumption or use. Thus, floor drain are used in the kitchen, bathroom and toilet to remove wastewater, so as to mitigate stagnation and to improve hygiene.

Generally, the decomposition of wastewater can lead to the following:

Read more on wastewater here: https://brainly.com/question/17791594

Answer:

Well, the acetone has a dipole, so dipole-dipole forces will be present. Water has a dipole and can also hydrogen bond, as can isobutyl alcohol.

Explanation:

All the possible intermolecular forces between acetone and water will be dipole - dipole interaction force and hydrogen bond.

The attractive interactions between both the positive ends of one polar molecule as well as the negative ends of another polar molecule were known as dipole-dipole forces.

A hydrogen bond seems to be an electrical attraction between such a hydrogen atom covalently bonded to a much more electronegative "donor" atom and group and maybe another electronegative with a single pair of electrons.

Acetone possesses a dipole, there must be dipole-dipole forces. Isobutyl alcohol, like water, does have a dipole and therefore can hydrogen bond.

To know more about hydrogen bond and dipole dipole interaction.

https://brainly.com/question/7545068

#SPJ2

Answer:

A compound

Explanation:

A compound is a substance formed from the chemical combination of atoms of two or more elements together.

A chemical compound always contains the same kinds of atoms of elements combined together in as specific ratio by mass and can be represented by a chemical formula. For example, water is a compound formed from the chemical combination of hydrogen and oxygen atoms in the ratio of 2 : 1. It has a chemical formula H2O.

A pure compound also always have the same chemical properties irrespective of the source of the compound. For example, chemically pure has similar properties irrespective of whether it is obtained from rain, streams or underground wells.

Therefore, if a new material was produced in a laboratory by bonding atoms of different elements together in a unique arrangement and other laboratories were able to reproduce these results, producing the same material with the same elements in the same arrangement, then the substance must be a compound.

The chemical properties could be obtained by adding acid to the plastic to see if it reacts.

Chemical properties are those properties that could only be observe when a substance undergoes chemical change. In this case, a chemical change could also be called a chemical reaction.

A substance could be said to undergo a chemical reaction  if there is a rearrangement of the atoms of the compound. This would ultimately lead to the formation of a new substance.

Now the forensic scientist wants to know the chemical properties of the plastic. This could be done by reacting the plastic with acid.

Learn more about chemical properties:https://brainly.com/question/5186976

#SPJ1

Answer:

The short answer is (C)  Add acid to the plastic to see if it reacts

Explanation:

Got it right on my quiz.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

To know more about Pressure, visit:

https://brainly.com/question/28012687

#SPJ4

Nitration of toluene takes place in four steps which include formation of nitronium ion, formation of electrophile, deprotonation, and elimination of  HNO₃.

The mechanism for the nitration of toluene showing explicitly why ortho and para products are favored over meta is as follows:

Step 1: Formation of the Nitronium Ion

NO₂⁺ is formed by nitric acid's reaction with sulfuric acid.

2HNO₃ + H₂SO₄ → 2 NO₂⁺ + 2HSO₄⁻ + H₃O⁺

The following is the formation of a nitronium ion:

Step 2: Formation of the electrophile

A nitronium ion is created, which is the electrophile. Because of the strong electron-releasing effect of the methyl group, the nitronium ion is drawn to the ring.

Due to the stability of the resulting carbocation, ortho and para products are favored over meta. In this, the bond on the methyl carbon is broken and the electrophile is added to it:

Step 3: Deprotonation: After the nitration reaction, an intermediate is formed in which a proton has been extracted from the methyl group. The formation of this intermediate indicates that the electrophile has been added to the ring's ortho or para positions.

Step 4: Elimination of HNO₃: An acid base reaction occurs to complete the nitration process, yielding nitrotoluene, HNO₃, and sulfuric acid. Here the intermediate is used to illustrate that the reaction has occurred with the ortho product. This reaction may also result in a para product in a similar manner.

Learn more about Nitration here:

https://brainly.com/question/26927899

#SPJ11

Answer:

96.1 %

Explanation:

Which teacher do you have lol

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option B.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. In the given phase diagram, region C represents gas phase.

Therefore, the correct option is option B.

To learn more about matter, here:

brainly.com/question/4562319

#SPJ1

Answer: A. Liquid

Explanation:

Answer:

1.3175675675675604

Explanation:

does this need to be rounded?

Answer:

506.81J

Explanation:

H = MC(T1 - T0)

H = 5 × 0.897 × (419 - 306)

H = 5 × 0.897 × 113

H = 506.81 J

As per specific heat of aluminium ,506.81 J of energy is gained  by the sample.

Specific heat capacity is defined as the amount of energy required to raise the temperature  of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature  and is different for each state of  matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

For the given example, Q=energy

m=mass=5 g, C=0.897 J/g.K

T₂=419 K

T₁=306 K

substituting in the formula ,Q=5×0.897(419-306)=506.81 J.

Thus, 506.81 J of energy is required.

Learn more about specific heat capacity,here:

https://brainly.com/question/1747943

#SPJ2

The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.

Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.

Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.

Learn more about substitution reaction below.

https://brainly.com/question/10143438

#SPJ1

A metal electrode composed of  strong reducing agent will have a greater

electrical potential to push electrons toward the electrode composed of a

weak reducing agent.

Strong reducing agents are compounds which donates or loses electrons

with a corresponding increase in the oxidation state. Weak reducing agents

can also be referred to as oxidizing agents and they accept the electrons

from the strong reducing agents which results in a reduction in the oxidation

state.

The strong reducing agent has a greater electric potential which aids the

electrons being pushed towards the electrodes with a weak reducing agent.

Read more on https://brainly.com/question/7484765