Identify the nonelectrolyte

Answer: The age of the tool is 15539 years

Explanation:

Expression for rate law for first order kinetics is given by:

[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant = 100

a - x = amount left after decay process = [tex]\frac{15.5}{100}\times 100=15.5[/tex]  

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.  

[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]

[tex]k=\frac{0.693}{5730yr}=0.00012yr^{-1}[/tex]

b) for 15.5 % of original amount

[tex]t=\frac{2.303}{0.00012}\log\frac{100}{15.5}[/tex]

[tex]t=15539years[/tex]

Thus age of the tool is 15539 years

Answer:

2NO(g) + O2(g) --> 2NO2(g)

now 400 ml of NO × 2 mol of NO2/2 mol of NO

= 400 ml of NO2

now 500 ml of O2 × 2 mol of NO2/1 mol of O2

= 1000 ml of NO2

now 400 ml of NO2 × 1 mol of O2/2 mol of NO

= 200 ml

subtract that from 500 ml of total i.e. 500-200 =300 ml

The total volume of the reaction mixture is 1000 ml -300ml = 700 ml

Answer:

(1) 0.50M in NaCl

(2) 0.25M in H₂SO₄

Explanation:

Problem 1

Molarity = moles of solute / volume of solution expressed in liters

moles of NaCl (solute) = mass(g)/formula wt.(g/mole

= 116 grams/58g/mole = 2 moles

Volume of solution (given)  = 4 Liters

Molarity = 2 moles NaCl / 4 Liters Sol'n = 0.50M in NaCl

Problem 2

again, Molarity = moles of solute / volume of solution expressed in liters

Molarity  = 3 moles H₂SO₄ / 12 Liters sol'n = 0.25M in H₂SO₄

Solution :

a). In this experiments, we can determine the hardness of the water or [tex]$Ca^{2+}$[/tex] ion concentration in the sample.

b). The Possible errors are :

- During the weighing of calcium standard preparation, if the balance is not traced properly, it will cause an error.

- By dilution of standard from the stock will lead a dilution error of 0.1 mL for 100 mL.

- Misreading the liter values will give an error.

c). Depending upon the calcium content present in the soil, we conclude that the fertile percent of the soil as well as the mineral capacity of the soil.

Answer:

c. nitrogen gas

Explanation:

Our air is a homogeneous mixture of many different gases and therefore qualifies as a solution. Approximately 78% of the atmosphere is nitrogen, making it the solvent for this solution.

Answer:

47 kj

Explanation:

Answer:

pH = 0.35

Explanation:

For a strong acid, all of the acid dissociates into H3O+, and pH = -log[H3O+], where [H3O+] = [HClO3] = 0.45 M.

Answer: 500 N

Explanation:

F=ma

so just multiply mass and acceleration

Answer:

D.

Explanation:

Hurrocanes are caused from un wanted mixed weather

Answer:

m = 51.93 grams

Explanation:

Given that,

Energy added, Q = 747 joules

The specific heat capacity of Aluminium, c = 0.899 J/g°C

The temperature goes from 105.0°C to 121.0°C.

Let the mass of the aluminum sample is m. We know that, the heat added to the system is given by :

[tex]Q=mc\Delta T\\\\m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{747}{0.899 \times (121-105)}\\\\m=51.93\ g[/tex]

So, the mass of the sample is 51.93 grams.

Answer:

in the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.

Explanation:n the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.

Plants and small organisms like plankton absorb mercury in the water via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

Biomagnification is the condition in which the chemical concentration in an organism exceeds the concentration of its food when the organism's diet is the primary exposure route.

Any concentration of a toxin, such as pesticides, in the tissues of tolerant species at increasingly higher levels in a food chain is referred to as biomagnification. One example of biomagnification in action is the accumulation of the insecticide DDT in zooplankton.

Mercury is taken up by water, plants, and small organisms such as plankton via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

Thus,  Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

To learn more about the biomagnification, follow the link;

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#SPJ2

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

But from the question

volume = final volume of water - initial volume of water

volume = 165 - 150 = 15 mL

We have

[tex]density = \frac{225}{15} = 15 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

In a lab, a student mixes 25.0 ml of 0.115 M aluminum sulfate with 34.0 ml of 0.0975 M Lead (III) nitrate. Calculate the grams of the precipitate that is formed.

Explanation:

Answer:

They cannot be re-melted by heating to form into new shapes.

Explanation:

Recycling refers to the process of melting a plastic and making it into another shape or size.

Thermoplastics can be softened repeatedly, melted and remoulded. Thermosetting polymers can not be softened, melted and remoulded once they are formed.

Hence, thermosetting polymers cannot be re-melted by heating to form into new shapes therefore they can't be recycled.

Answer:

a) Burning

b) physical

c) 10

d) constant

Explanation:

Mass remains same in a physical reaction. It changes only in chemical reactions where some of the mass is lost as energy /heat.

Thus, during combustion mass changes while during melting mass of water do not changes.

Answer:

0.41kg/s

Explanation:

Question 5 In the Haber reaction, patented by German chemist Fritz Haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. This reaction is now the first step taken to make most of the world's fertilizer. Suppose a chemical engineer studying a new catalyst for the Haber reaction finds that 505. liters per second of dinitrogen are consumed when the reaction is run at 172 °C and the dinitrogen is supplied at 0.88 atm. Calculate the rate at which ammonia is being produced. Give your answer in kilograms per second. Round your answer to 2 significant digits. Clears your work. Undoes your last action. Provides information about entering answers.

Step 1: Convert 172 °C to Kelvin

We will use the following expression.

K = °C + 273.15

K = 172°C + 273.15 = 445 K

Step 2: Calculate the moles of N₂ consumed every second

We will use the ideal gas equation.

P × V = n × R × T

n = P × V/R × T

n = 0.88 atm × 505. L/(0.0821 atm.L/mol.K) × 445 K = 12 mol

Step 3: Calculate the rate of production of ammonia

Let's consider the balanced equation for the synthesis of ammonia.

N₂ + 3 H₂ ⇒ 2 NH₃

The molar ratio of N₂ to NH₃ is 1:2. The rate of production of ammonia is:

12 mol N₂/s × 2 mol NH₃/1 mol N₂ = 24 mol NH₃/s

Step 4: Convert the rate from mol/s to kg/s

We will use the following conversion factors:

[tex]\frac{24mol}{s} \times \frac{17.03 g}{1mol} \times \frac{1kg}{1000g} = 0.41kg/s[/tex]

Answer:

An abrasion or scrape. Spray or pour hydrogen peroxide on the womb. Then apply a patch wrapped to it with an adhesive tape.

Answer:

See explanation below

Explanation:

You are not providing the alkene you want to stabilize, however, I manage to find a similar question with an alkene. All you have to do is follow the same procedure, cause its pretty similar the steps.

According to the below picture, we have an alkene between carbon 1 and 2, where carbon 2 is less stable than carbon 3 which have another methyl group.

In order to do this, in a first step, the alkene is converted into a alkane by the addition of a hydrogen atom that the hydronium has. Then, in the next step, we have a substraction of the hydrogen in carbon 3 to form the double bond between carbon 1 and 3.

The true statement is that the concentrations of reactants and products remain constant chemical equilibrium is achieved.

Equilibrium is a condition where no change in the system of the reaction takes place.

If we represent a chemical reaction in the equilibrium state as:

A + B ⇄ C + D

Where, A & B are reactants and C & D are products and at the equilibrium condition concentration of reactant as well as of products remain constant which is dedicated by double headed arrow.

Hence in equilibrium concentration of reactants as well as of products are constant.

To know more about equilibrium state, visit the below link:

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Answer:

Explanation:

Explanation:

If Earth’s temperatures increase, it would likely have these effects:

The East Coast of the United States will face an increased risk of hurricanes as warmer waters increase evaporation.

The polar region will experience melting ice caps, which will cause sea levels to rise.

Warmer water in the Great Lakes will cause heavier lake-effect snows.

In the Pacific Ocean, heating of the water will cause a change in convection currents.

Hot, dry conditions will increase the risk of wildfires in the forests of California.

In the Himalayas, animal and plant life will migrate to higher ground to live.

The coastal regions of Europe will be at greater risk of flooding because of rising sea levels.

Answer:C

conjugate of H3O+ is H2O

The correct answer is: C. “Tina’s mother has severe FBAO. Tina should begin administering back blows followed by abdominal thrusts if the problem persists.”

Explanation: I did my study and took the test, this was right. :)

Explanation:

the first shell have 2 electrons

the second shell also have 8 electrons

the third shell also have 8 electrons

the fourth shell have only 1 electron

so the electronic configuration of Potassium is

2,8,8,1

Answer:

An X-ray photon of wave length 0.989 nm strikes a surface. The emitted electron has a kinetic energy of 969 eV. What is the binding energy of the electron in kJ/mol? [KE=

1

2

mv2;1 electron volt (eV)=1.602×10−19J][KE=

2

1

mv

2

;1 electron volt (eV)=1.602

The binding energy of the emitted electron is  5.48 x 10⁻²⁰ kJ/mol.

The given parameters;

The binding energy of the electron is calculated as follows;

from Einstein's mass defect equation

[tex]\Delta E = \Delta mc^2\\\\[/tex]

Also, from Einstein's photo-electric equation;

E = φ + K.E

where;

φ is the binding energy of the electron on the metal surface

The energy of one mole of electron the emitted is calculated as;

[tex]E = hf = h\frac{c}{\lambda} \\\\E = \frac{(6.626 \times 10^{-34}) \times (3\times 10^8)}{0.954 \times 10^{-9}} \\\\E = 2.084 \times 10^{-16} \ J[/tex]

The kinetic energy of the emitted electron in Joules is calculated as;

K.E = 959 x 1.602 x 10⁻¹⁹ J

K.E = 1.536 x 10⁻¹⁶ J

The binding energy of the electron is calculated as;

φ = E - K.E

φ = 2.084 x 10⁻¹⁶ J  -   1.536 x 10⁻¹⁶ J

φ = 5.48 x 10⁻¹⁷ J

φ = 5.48 x 10⁻²⁰ kJ/mol

Thus, the binding energy of the emitted electron is  5.48 x 10⁻²⁰ kJ/mol

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Answer:

n = 1.075  moles

Explanation:

Given that,

Mass of oxygen = 34.4 gram

The molar mass of oxygen gas = 32 g/mol

We need to find the number of moles of oxygen. We know that,

No. of moles = given mass/molar mass

So,

[tex]n=\dfrac{34.4\ g}{32\ g/mol}\\\\=1.075\ mol[/tex]

So, there are 1.075  moles in 34.4 g of Oxygen gas.