A sample of gas has an initial volume of 3.62 L at a pressure of 0.987 atm. If the volume of the gas decreases to 2.50 L, what will the pressure be

The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later, then the half life time is 365 hours.

Half life time for the first order reaction will be calculated by uisng the below equation as:

k = 0.693/t, where

t = half life time

k is the rate constant and its value will be calculatedy using the below equation as:

ln(No/N) = kT, where

No = initial concentration of radioisotope = 3000

N = remaining contentration of radioisotope = 2736

T = time require for above change = 48 hours

On putting these values on above equation, we get

k = ln(3000/2736) / 48 = 0.0019

Now putting this value in the first equation, we get

t = 0.693/0.0019 = 364.7 = 365 hours

Hence half life time is 365 hours.

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Answer:

A comet

Explanation:

Comets  travel so fats through the solar system that they melt which give them their glowy tail

Answer:

The molar concentration of NaOH in the final diluted solution is 0.056 M

Explanation:

Answer: they convert heat to electricity.

Explanation:

Answer:

b

Explanation:

Answer:

The answer is B

Explanation:

I hope this helps very much

Answer:

Give evidence for the existence of a magnetic field near a current carrying wire. If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected.

If more Na[tex]_2[/tex]O[tex]_2[/tex] were added in 2Na(s) +0,02Nao,(s)→ Na[tex]_2[/tex]O[tex]_2[/tex]. The equilibrium position would shift to produce more Na and O[tex]_2[/tex]. Therefore, the correct option is option C.

During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. When a chemical reaction is reversible, the products react with the original reactants as soon as they are created.

There's no net change in the quantity of the chemicals involved when the two opposed reactions are in equilibrium because they are occurring at identical rates, or velocities. At this point, the reaction can be deemed to be finished, meaning that the maximum amount of reactants into products has been converted under the given reaction conditions. If more Na[tex]_2[/tex]O[tex]_2[/tex] were added in 2Na(s) +0,02Nao,(s)→ Na[tex]_2[/tex]O[tex]_2[/tex]. The equilibrium position would shift to produce more Na and O[tex]_2[/tex].

Therefore, the correct option is option C.

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Answer:

b

Explanation:

Answer:

We used coal for electricity, water for steam engines when we used them, natural fossil fuels for gasoline and oil and we use earths oxygen/nitrogen gases to breathe

Explanation:

Hope this helps:)....if not then sorry for wasting your time and may God bless you:)

Answer:

that make 11 isomers....

Answer:

A pearl is not a mineral

Explanation:

Even though a pearl is made up of a few little overlapping platelets of certain minerals such as aragonite, which is the stable form of calcium carbonate which is a necessary component for sealife. Why is a pearl not a mineral though? Yes a pearl is made up of mineral compounds, but its organic origins take away its ability to be included as a mineral. Pearls do not have distinctive crystal structures and are formed by living organisms.

Answer:

B, C and D

Explanation:

Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.

Although fossil fuels are continually formed by natural processes, they are classified as non-renewable resources because they take millions of years to form.

fossil fuels, are called nonrenewable, which means they have a limited supply and are not continuously being made or they are made very slowly

Answer:

7.2 x 10^23

Explanation:

Currently in Chemistry class

Answer:

187 L

Explanation:

its the correct answer on smartsparrow.

Answer: 0.813 L

Explanation:

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of helium gas is 5.63 atm.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of  radon gas

V= volume of  radon gas

n =number of moles of  radon gas

T =temperature of radon gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

{ (1.15 atm) (1.53 L)} ÷305  K ={ (P2) ( 1.78)} ÷325 K

P2 = 7.55÷1.34 = 5.63 atm

Therefore the new pressure of radon gas is 5.63 atm when the temperature is changed to 325K and volume is decreased to 1.78liter.

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Answer:

make me brainliest pls :)

Explanation:

Science is both a body of knowledge and a process. In school, science may sometimes seem like a collection of isolated and static facts listed in a textbook, but that's only a small part of the story. Just as importantly, science is also a process of discovery that allows us to link isolated facts into coherent and comprehensive understandings of the natural world.

Science is exciting. Science is a way of discovering what's in the universe and how those things work today, how they worked in the past, and how they are likely to work in the future. Scientists are motivated by the thrill of seeing or figuring out something that no one has before.

Science is useful. The knowledge generated by science is powerful and reliable. It can be used to develop new technologies, treat diseases, and deal with many other sorts of problems.

Science is ongoing. Science is continually refining and expanding our knowledge of the universe, and as it does, it leads to new questions for future investigation. Science will never be "finished."

Science is a global human endeavor. People all over the world participate in the process of science. And you can too!

Explanation:

1. Measure your waste

It is easier to manage and track your improvement on something that is measured. Start by recording the types and quantities of waste materials generated within your business.

This could just be a quick visual assessment and estimation of amount and types of waste per week. As you change how you manage your waste, you can compare and see what difference your changes make to the amount of waste disposed to landfill.

2. Reduce

To reduce the amount of waste going to landfill, consider:

can waste be avoided or reduced by the way you procure goods and services or by changing your business operations?

does another local business have a use for the waste materials produced by your business?

what materials can be targeted for recycling?

3. Recycle

Find out what options are available locally for business recycling.

4. Collection services

It is a good idea to find out how levy fees will be managed by your waste service provider, and find out more about your waste collection services—how it impacts your ability to recycle and what options are available to you.

5. Separating waste

It’s important to ensure that waste is correctly separated for recycling. Putting the wrong waste in contaminates the recycling. Check out the free-to-download recycling signage to help businesses communicate correct recycling and waste separation behaviours.

Answer:

Original: P₁ = 710 mmHg, V₁ = 14.8 mL, T₁ = (273.2 + 11.0) K = 284.2 K

New: P₂ = 370 mmHg, V₂ = ? mL, T₂ = (273.2 + 20.0) K = 293.2 K

Combined gas law: P₁V₁/T₁ = P₂V₂/T₂

Then, V₂ = V₁ × (P₁/P₂) × (T₂/T₁)

Calculated new volume, V₂ = (14.8 mL) × (710/370) × (293.2/284.2) = 29.3 mL

Geraldo can add a pollutant with slightly basic nature so he will have a solution of neutral pH of 7.

The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.

The pH of 6.5 means that the solution is acidic.

By adding a pollutant which is slightly basic in nature, Geraldo will have a solution of neutral pH which is a pH of 7.

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Answer:

1.pesticide

2.less than 6.65

Explanation:

Answer:

180 g NaOH

Explanation:

Step #1 : Use the molarity equation to find moles. The volume is needed in liters, so convert the milliliters to liters.

Molarity (M) = moles (mol) / liters (L) ---->

Molarity (M) x liters (L) = moles (mol)

750 mL NaOH              1    L
                          x    ----------------   =    0.75 L NaOH
                                 1,000   mL

(6 M NaOH) x (0.75 L NaOH) = ? mol

                                                = 4.5 mol NaOH

Step #2 : Find the mass using the moles and the molar mass of the solution. The molar mass can be calculated using the values of the elements on the periodic table.

Molar Mass (g/mol) = grams (g) / moles (mol) --->

Molar Mass (g/mol) x moles (mol) = grams (g)

? g/mol = (22.99 g/mol Na) + (15.999 g/mol O) + (1.008 g/mol H)

? g/mol = 39.997 g/mol NaOH

(39.997 g/mol NaOH) x (4.5 mol NaOH) = ? g

                                                                  = 179.99 g NaOH

                                                                  = 180 g NaOH (2 sig figs)

                                                                  = 200 g NaOH (1 sig fig)

Let's see

Option D

Empirical Formula StepsN2O6Sr Strontium Nitrate

Explanation:

Answer:3

Explanation: an increase in pressure will just place the point of equilibrium in the direction that fevers the formation of the fewer number of moles. A decrease in pressure will displace the point of equilibrium in the direction that favors the formation of a greater number of moles as a system attempts to return to equilibrium

The reaction CaCO3(s) →Cao(s) + CO2(g) at equilibrium will be shifted to the right when the pressure decreases at constant temperature.

Chemical equilibrium can be defined as the state of a system where the concentration of the reactant, as well as the concentration of the products, as well as the concentration of the products, will not change over time and the system's characteristics also will not change.

It is well known that when the number of moles grows, equilibrium shifts to the side where the number of moles grows when pressure is reduced.

In this equation, CaCO3(s) →Cao(s) + CO2(g)

Number of moles in reactant side= 1

Number of moles in product side = 2

Hence, for this reaction equilibrium will be shifted in right side.

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The mass of oxygen reacted/required in this reaction is obtained as 48g.

The term stoichiometry has to do with mass- volume or mass - mole relationship which ultimately depends on the balanced reaction equation.

Now, we have the reaction; S + O2 ------>SO2

If 1 mole of sulfur dioxide contains 22.4 L

x moles of sulfur dioxide contains 33.6L

x = 1.5 moles of sulfur dioxide.

Since the reaction is 1:1, the number if moles of oxygen required/reacted is 1.5 moles.

Mass of oxygen required/reacted = 1.5 moles * 32 g/mol = 48g

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Answer:

Natural passive immunity

Explanation:

Breatsfeeding is natural....

antibodies passes from the parent to the infant...

The infant gets nutrition in which later antibodies will be formed by the nutrients..

-246 K-

________________

Answer:

0.15 l of 4.0 m stock KCl solution should betaken

Explanation:

N1V1=N2V2

6*0.1=V2*4

V2=0.15L