What nuclide is produced when O-15 decays by positron emission? (a) 14 N
7
(b) 15 N 7
(c) 14 O 8
(d) 15 F
9
(e) 16 F
9

Convert 4.0 moles of N2 gas to liters.

1mole = 22.4 lts of any gas

unitary method :-

so we can say 4 moles = 4 × 22.4 lts of gas

4 moles of N2 gas = 89.6 lts of N2 gas

The volume of water added to dissolve potassium hydrogen phthalate (KHP) does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

In volumetric analysis, the primary objective is to find the exact concentration of an analyte in a given solution. Analyte refers to the substance whose concentration is to be determined.In order to measure the analyte concentration, the known volume of the titrant of known concentration is added to the analyte until the endpoint is reached.Endpoint refers to the point in a titration where the reaction between the analyte and titrant is complete. The endpoint can be detected by observing a physical change in the system.In the case of KHP, it dissolves completely in any volume of water.

Therefore, the mass of KHP used can be accurately measured and dissolved in any volume of water. As a result, the volume of water added to dissolve the KHP does not affect the accuracy of the experiment.In summary, the volume of water added to dissolve KHP does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

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ANSWER

The volume of SO2 is 147.89L

STEP-BY-STEP EXPLANATION:

Given information

Step 1: Find the mole of SO2 using the below formula

Recall, the molar mass of SO2 is 64.066 g/mol

Recall that, 1 mole of gas is equivalent to 22.4L at STP

Let x represents the volume of SO2

Hence, the volume of SO2 is 147.89L

The amount of carbon-14 in each page of a book decreases over time due to its radioactive decay. After each year, the amount of carbon-14 will be reduced by half, following its 5,700-year half-life.

Carbon-14 undergoes radioactive decay with a half-life of 5,700 years, which means that after 5,700 years, half of the carbon-14 present initially will have decayed.

Therefore, after the first year, each page of the book will contain 0.25 mg of carbon-14, as it is reduced by half. After another year (2 years total), it will be further reduced by half, resulting in 0.125 mg of carbon-14.

This process continues, with each passing year halving the amount of carbon-14. After 3 years, each page will contain 0.0625 mg, after 4 years it will be 0.03125 mg, and so on. The reduction by half occurs every 5,700 years, representing the half-life of carbon-14.

This pattern continues indefinitely, with the amount of carbon-14 gradually approaching zero as more time passes.

It's important to note that the calculation assumes no additional carbon-14 is introduced into the book or lost through other means. Additionally, the actual age determination of an object requires more complex measurements and considerations, such as calibration with known standards and correction factors for different environmental factors.

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0.5549 g is  the Molar mass of calcium chloride CaCl₂ that is needed to form a 100.0 ml solution of 0.150 m CaCl₂.

To prepare 100 mL of a 0.050 M solution of calcium chloride (CaCl₂), you will need to follow these steps:
1. Determine the amount of CaCl₂ needed: Use the formula n = M × V, where n is the amount of substance in moles, M is the molarity, and V is the volume in liters. In this case, n = 0.050 M × 0.100 L = 0.005 moles.
2. Calculate the mass of CaCl₂: Multiply the moles (n) by the molar mass of CaCl₂ (110.98 g/mol). Mass = 0.005 moles × 110.98 g/mol = 0.5549 g.

Everybody wants to know how many molecules are there in a certain substance. Both in terms of mass and size, atoms and molecules are exceedingly tiny. The molar mass is the mass of one sample mole. Connect the atomic masses (atomic weights) of all the atoms in the molecule to obtain the molar mass. Calculate each element's atomic mass using the mass specified in the Periodic Table or Atomic Weight Table.
3. Measure and dissolve the CaCl₂: Weigh out 0.5549 g of calcium chloride and dissolve it in a small amount of distilled water.
4. Dilute to the desired volume : Mix well to ensure a uniform concentration

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The Complete question is

Calculate the mass of calcium chloride CaCl₂ that is needed to form a 100.0 ml solution of 0.150 m CaCl₂?

Conversion of 7g/dm³ of H₂O to 0.21 mol/dm³ is

Conversion is the act or process of changing something into a different state or form

Here given data is

7g/dm³ of H₂O we have to convert it into mol/dm³ = ?

Then divide by the relative formula mass

We get  H₂O then H = 1 here 2 hydrogen = 1×2 = 2 and 1 oxygen i.e 1×16 = 16 =

2×16 = 32

So,  7g/dm³/32

= 0.21 mol/dm³

7g/dm³ of H₂O to 0.21 mol/dm³

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Polyatomic ion is OOH

Polyatomic ion are ion which consist of more than one atom and atom in a polyatomic ion are usually covalently bonded to one another and therefore stay together as a single or charged unit and here OOH there are two oxygen atom and one hydrogen atom that's it is polyatomic ion

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Answer:299,800,000

Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.

The tensile stress required to fail a tensile coupon that has a 0.5 mm crack on one side is about 14.35 MPa.

Polymethyl methacrylate (PMMA) is a transparent thermoplastic often used as a lightweight or shatter-resistant alternative to glass. It is also used in casting, molding, and extrusion. The tensile strength of PMMA is roughly 65 MPa, but this value changes when a defect is present. The stress required to cause failure can be calculated using the single edge notch plate model to calculate the geometric factor Y.

The fracture toughness of PMMA is 1 MPa m¹/2, and the crack length is 0.5 mm. 12.5 mm is the width of the specimen.For a tensile coupon, the tensile stress required to fail it with a 0.5 mm crack on one side is calculated using the following formula:Stress = (K IC / Y √(πa)) × (b / W)where KIC is the fracture toughness, Y is the geometric factor, a is the crack length, b is the specimen width, and W is the specimen width. For a PMMA coupon with a 0.5 mm crack, a is 0.5/2 = 0.25 mm. Y = 1.12, according to the single edge notch plate model. Substituting the given values, the stress required to fail the coupon is:Stress = (1 MPa m¹/² / 1.12 √(π x 0.25 mm)) × (12.5 mm / 12.5 mm)≈ 14.35 MPa.

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The additional reactant required for oxidation of polyunsaturated fatty acids compared to saturated fatty acids is Biotin.

Biotin is a coenzyme that helps in the carboxylation of fatty acids, which is necessary for their oxidation. Polyunsaturated fatty acids have more double bonds than saturated fatty acids, which makes them more flexible and prone to structural changes.

Therefore, biotin plays a crucial role in the oxidation of these flexible fatty acids. On the other hand, saturated fatty acids have a more rigid structure, making them less dependent on biotin for their oxidation.

In summary, biotin is essential for the oxidation of polyunsaturated fatty acids due to their structural properties, while saturated fatty acids require less biotin for oxidation.

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Answer:

Heating Fan is 75.33% efficient.

Explanation:

As it is mentioned that the given fan is a HEATING FAN, it means the it is used for provided heat (thermal energy) to the surrounding. Hence, its efficiency depends upon how much heat/thermal energy is provides.

We can state that.

Total Energy provided = 150 J

Useful Energy = 113 J

Wasted Energy = 37 J

The efficiency of the heating fan can be given by following formula:

Efficiency = ( Useful Energy / Total Energy ) × 100

Efficiency = ( 113 J / 150 J) × 100

Efficiency = (0.7533)× 100

Efficiency = 75.33%

The empitical formula shows the simplest ratio of elements in a compound (not the total number of atoms in the molecule).

So to find the empirical formula we need to calculate how many moles of each atom we have in this sample. Then we will see the ratio of each element.

We are given the mass, so to convert it to moles we use the molar mass. For this we go to the periodic table and see that the values for each element are:

Na (sodium): 22,99 g/mol

H (hydrogen): 1 g/mol

P (phosphorus): 25,81 g/mol

So we calculate the moles of each element as follows:

And as we see, for every 0.833 moles of Na we have the same number of moles of P, so the ratio of these elements in the molecule is 1 to 1.

As for the hydrogen:

So the ratio Na to H is 1 to 2.

Now we can write the empirical formula as follows=

If the gases are at the same temperature and pressure, the ratio of their effusion rates is directly proportional to the ratio of the square roots of their molar masses:

This states that the rate of diffusion of a gas is inversely proportional to the square root of the molar mass i.e

R ∝ 1/ √M

R₁/R₂ = √(M₂/M₁)

Where

From the Graham's law equation, we can see that the ratio of the rates of effusion of the two gases is directly proportional to the square root of their molar masses

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Answer:

Flame test is one of the chemical tests that can be used to identify a metal or metaloid

in an ionic compound.

Explanation:

Flame test is guided by a principle that when an unknown metal is heated, heat of the flame converts the metal ions into atoms which become excited and emit visible light.

To carry out flame test in a laboratory the following instruments are required:

--> a wire loop

--> Bunsen burner

--> the chemical compound under observation

--> protective wears.

The procedure involves the following steps:

--> turn on the Bunsen burner and adjust the barrel of the burner roll the flame is blue.

--> using a clean wire loop deep into a beaker containing hydrochloric acid.

--> to ensure that the loop is clean, it will give the same blue colour of the flame when heated.

--> deep the loop in the acid again and then use it to pick few grains of the metal.

--> place the wire loop in the side of the flame and observe the colour of the flame.

Result of flame tests of some metallic ion will show the following:

--> sodium ion will give yellow colour flame

--> potassium ion will give lilac colour flame

--> calcium ion will give orange-red colour flame

The Newton Cradle is device that could be used to explain the Newton third law of motion but its working could be hampered by friction.

We need to recall that Isaac Newton was a scientist whos research centered a lot around the reason for motion. In his studies, we can see that force is the reason for motion. As such, an object tends to move when the object have been acted upon by a system of unbalanced forces.

The Newton Cradle is a system that could be used indicate the principle of the conservation of linear momentum as we can see from the Newton third law. Recall that from the Newton third law; action and reaction are equal and opposite.

Having said this, we can see that the force that acts on one end of the sphere is transmitted across the spheres such that the last sphere across also moves upwards. The sphere could be prevented from working by friction.

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Answer:

24.3

Explanation:

Two containers of gas have the same volume, temperature and pressure. One container has a sample of oxygen gas having a mass of 3.95g. The other container has a gas with a mass of 2.99g. Determine the molar mass of the gas in the second container.

O2 has a molar mass of 16 X 2 =32

the number of moles for O2 is the weight divided by the molar mass or, but since the two container have the same P,V, AND T they have the same number of moles since

PV =nRT

SO

the weight of the gas in the second container divided by its molar mass =

0.123

or

2.99/? = 0.123

so

? = 2.99/o.123 = 24.3

Weight of 12 liters of ammonia (NH3) at room temperature and pressure is 8.4g.

The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. An ideal gas is one in which the particles are both non-repellent and non-attractive to one another (have no volume). Although no gas is absolutely perfect, the ideal gas law does offer a decent approximation of real gas behavior in a variety of situations.

Ideal gas law equation is : PV = nRT

where,

n : No. of moles

P : Pressure of the gas

V : Volume of the gas

R : Universal gas constant

T : Temperature

V( volume of the gas ) = 12 liters

T( Temperature ) = 293 K

P( Pressure )  = 100 kPa

m( mass ) = ?

PV = nRT

( Ideal gas equation )

R = 8.3145 liters-kPa/mol K (Ideal gas constant)

\(n(no. of moles) = \frac{100 * 12}{293 * 8.3145} mol\\\\ n = 0.492 mol\)

Molar mass of NH3 =  17.03 g/mol

∴ Total mass of NH3 = (17.03 x 0.492) g =  8.38g ≈ 8.4g

Thus, total mass of 12 litres of ammonia at room temperature and pressure is 8.4g

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Answer:

Explanation:

.......

Answer:

Gas

Explanation:

Solid= Particles are really tight (Example: Ice Cube) Has a fixed shape

Liquid= Particles flow freely but is of constant volume.(Liquid fills it's container. Example: Water) No fixed shape

Gas= Particles move freely can fill its container has NO FIXED SHAPE or NO FIXED VOLUME(Example: Oxygen) Particels move FASTEST

Explanation:

2Al(OH)3 + 3H2SO4 --> Al2 (SO4)3 + 6H2O

Answer:

0.921 J/g degrees C

Explanation:

Recall that the First Law of Thermodynamics demands that the total internal energy of an isolated system must remain constant. Any amount of energy lost by the brakes must be gained by the tires (in the form of heat in this situation).  Therefore, heat given off by the brakes = −heat taken in by tires, or:

−qbrakes=qtires

The equation used to calculate the quantity of heat energy exchanged in this process is:

−qbrakes=−cbrakes mbrakes ΔTbrakes=ctires mtires ΔTtires=qtires

First we must convert the mass of the tires and the brakes from  kg to  g.

massbrakes=90.7 kg×1,000. g1 kg=9.07×104 g

masstires=123 kg×1,000. g1 kg=1.23×105 g

Next, substitute in known values and rearrange to solve for ctires. Note that the final temperature for both the tires and the brakes is 172∘C, the initial temperature of the brakes is 312∘C and the initial temperature of the tires is 15∘C.

−(1.400Jg∘C)(9.07×104 g)(172∘C−312∘C)=(ctires)(1.23×105 g)(172∘C−15∘C)

ctires=−(1.400 Jg∘C)(9.07×104 g)(−140∘C)(1.23×105 g)(157∘C)=17,777,200 J19311000 g∘C=0.9206Jg∘C

The answer should have three significant figures, so round to 0.921Jg∘C.

Cu-63 and Cu-65 have 34 and 36 neutrons, respectively, in each atom. 27- Because copper has an atomic number of 29, which essentially implies that an atom of copper has 29 protons and 29 electrons, an atom of copper has a total of 29 electrons.

The stable isotope of copper is copper-63, which has a nuclear spin of 3/2, a relative atomic mass of 62.929601, and a natural abundance of 69.2 atoms. a trace element of a heavy metal having the atomic symbols Cu, 29, and 63.55. This atom has the mass number 63 because it is a copper-63 atom. Every atom of a particular element has the same atomic number, which may be determined as the element's number on the predictable.

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Element “X” belongs to family 2A, meaning it is part of the family that includes elements such as Be and Mg. These elements will all have 2 valence electrons and can be represented by the following Lewis diagram:

Element “Y” belongs to family 5A, meaning it is part of the family of elements that includes elements such as N and P. These elements will all have 5 valence electrons and can be represented by the following Lewis diagram:

Atoms from these two families will usually react with each other by losing or gaining valence electrons to create stable ions (an ion is what we call an atom/particle that has a charge). These stable ions form by the atoms either losing or gaining electrons until they have the same number of valence electrons as the nearest Noble Gas. This means that each ion will have a full valence shell (usually consisting of 8 electrons), often referred to as a “stable octet”, and this process of creating stable ions is often called the “octet rule”.

Atoms with fewer that 4 valence electrons will normally have a weak hold on their valence electrons and will tend to lose their valence electrons when forming ions.

Atoms with 4 or more valence electrons will normally have a strong hold on their valence electrons and will tend to gain electrons when forming ions.

The charge on the ion arises from the fact that, initially, the atom is electrically neutral because it has the same number of electrons (negative charges) as protons (positive charges). By losing electrons, the atom will end up with more protons (positive charges) than electrons (negative charges) and will form an ion with an overall positive charge. By gaining electrons, the atom will end up with more negative electrons than positive protons becoming an ion with an overall negative charge.

So, an atom of element “X”, with only 2 valence electrons, must lose its 2 valence electrons (which will be gained by element “Y”) to form a stable ion with a 2+ charge (losing two electrons leaves the ion with 2 more positive charges (protons) than negative charges, so a net charge of 2+).

An atom of element “Y”, with 5 valence electrons, must gain 3 electrons (from element “X”) to form a stable ion with a 3- charge (gains 3 extra negative charges).

We can show this process using Lewis diagrams:

From this set of diagrams you can see that in order to create stable ions of both “X” and “Y” we need these atoms to react with each other in a 3:2 ratio (we need 3 atoms of X for every 2 atoms of Y). This means that the resulting chemical formula of the compound will be:

Now, we will look at a short cut that can help you figure this out without having to draw Lewis diagrams.

Compounds are electrically neutral, meaning they must contain equal numbers of positive and negative charges. For compounds consisting of oppositely charged ions, this means that the total charge of the negative ions must be equal to the total charge of the positive ions. In other words the ions must combine in a ratio that makes their charges add to zero.

If we look at the compound we just made, X3Y2, we can confirm this:

So, now you can you predict the formula of simple ionic compounds:

from the family of elements, determine the number of valence electrons each element has

determine the charge of the ions that each atom will form using the octet rule (or look on the periodic table, most will tell you the stable ionic charges that each element can form)

determine the ratio of positive ions to negative ions that results in an overall charge of zero

Example,

What is the formula of a compound produced when an element from family 3A combines with an element from family 7A?

Answer:

gas

Explanation:

particles are very far apart

The given diagram represents gaseous state of matter.  Both a volume and a definite form are absent from a gas. The separation of gas particles is great.

Solids, liquids, gases, plus plasma are the four states of matter that may be found in daily life. However, a number of additional states of matter have indeed been found.

Some of these additional states are created when a material transitions among two states of matter and doesn't actually exhibit the characteristics of either state. The most exotic are others. Both a volume and a definite form are absent from a gas. The separation of gas particles is great. The gas in a balloon and the air are two examples of gases. The given diagram represents gaseous state of matter.

Therefore, the given diagram represents gaseous state of matter.

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Answer:

Explanation: wht do i do??

The molarity of a solution is defined as the number of moles of solute per liter of solution.

We first need to convert the volume of the solution from milliliters to liters:

\(\implies 750.0\: \cancel{mL} \times \dfrac{1\: L}{1000\: \cancel{mL}} = 0.750\: L\)

Now we can calculate the molarity (M) using the formula:

\(\implies M = \dfrac{\text{moles of solute}}{\text{liters of solution}}\)

Substituting the given values:

\(\begin{aligned}\implies M&= \dfrac{4.70\: moles}{0.750\: L}\\& = \boxed{6.27\: M}\end{aligned}\)

\(\blue{\overline{\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad}}\)

Answer:

Sulfur

Explanation:

S+2e−→S2−

What is meant by isomerism?

➪ Two or more compounds having the same molecular formula but different structures are called isomers and this process is known as isomerism...~

Explanation:

Isomerism is basically denoted to two compounds having same molecular formula but different structures ,functional groups,bonds at different places.

It's of three types

Answer:

The correct options are;

1. 1,600

2. 100 Watts

A 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb

Explanation:

Brightness is measured in lumens and watts measure energy usage therefore with the use of an energy saving light bulb, the same lumination can be obtained at a lower energy usage.

According to a comparison chart for LED Lights vs. Incandescent Light Bulbs vs. Compact Fluorescents (CFLs) from USAI lightening website 23-30 watts CFL has a light output of 1,600 and is therefore produces enough light as a 100 Watts Incandescent Light Bulb

Also according to energy.gov website, CFLs save up to 75% energy such that a 23-30 watt CFL can produce the same illumination as a 100 watt incandescent bulb

Therefore we have, a 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb.

Answer:

1600 lumens, 100 watt incandescent

Explanation:

100% on edge (:

When a 0. 1 m aqueous solution of hydrocyanic acid, HCN, reaches equilibrium, the ka for hydrocyanic acid is  3.969 x 10⁻¹⁰.

It's the value of equilibrium constant for the dissociation of ions into a solution. The more the Ka value the more will be dissociation.

Ka = [H₃O⁺]² / [HCN] [H₃O⁺]

The pH is 5.20

-log [H₃O⁺] = 5.20

Putting antitlog both side.

The value will be 6.30 x 10⁻⁶

Ka = (6.30 x 10⁻⁶)²  / 0.1 - 6.30 x 10⁻⁶

0.1 - 6.30 x 10⁻⁶ = 0.1

Ka = 3.969 x 10⁻¹⁰

Thus, the Ka value for hydrocyanic acid is 3.969 x 10⁻¹⁰.

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