Ramelteon is a hypnotic agent used in the treatment of insomnia: Considering the labeled drawing above, which of the highlighted atoms has a delocalized lone pair? Select all that apply. 1 2 3 Identify the geometry of each atom (except for hydrogen atoms). All sp2-hybridized carbon atoms have geometry. All sp3-hybridized carbon atoms have geometry. The nitrogen atom has geometry. The oxygen atom of the C=O bond has geometry, and the other oxygen atom has geometry.

Stock solutions contain a standardized concentration of the solute in a solution. To prepare 50 mL of solution with a ratio of 1:1000 solution, 5 gms of the drug will be required.

Dilution is the property of the solution with a less amount of solute concentration than the stock solution. A dilute solution is prepared by the addition of more solvent.

The addition of the solvent in a solution decreases the molar concentration which leads to dilution.

The ratio of 1:1000 means that 1 gm of the drug is present in 1000 mL (1L) of solution.

1000 mL = 1 gm × 500 mL × X gm

Here, the X represents the 0.5 gm of drug dissolved in 500 mL.

The amount of drug used is calculated as,

5 mL ÷ 50 ml = 0.5 g ÷ X g

X = 0.5 × 50 ÷ 5

= 5 gm

Therefore, 5 gm of the drug is required to prepare 50 mL of solution.

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Answer:

Cu    +    2AgNO₃  →   2Ag    +    Cu(NO₃)₂

Explanation:

The reactants are:

         Copper metal  = Cu

         Silver nitrate  = AgNO₃

The products are:

          Silver metal  = Ag

           Copper (II) nitrate  = Cu(NO₃)₂

So, the reaction equation is given as;

      Cu    +    2AgNO₃  →   2Ag    +    Cu(NO₃)₂

This is a single displacement reaction

Answer:

448

Explanation:

K =273+°c

K=273+175

K=448

Answer:

The temperature at which rhenium becomes superconducting is -271.6 ºC.

Explanation:

We can convert the temperature given in Kelvin, which is an absolute scale, into degrees Celsius. which is a relative scale, by a simple algebraic translation, that is:

[tex]T_{C} = T_{K} - 273[/tex] (1)

Where:

[tex]T_{C}[/tex] - Temperature, measured in degrees Celsius.

[tex]T_{K}[/tex] - Temperature, measured in Kelvins.

If we know that [tex]T_{K} = 1.4\,K[/tex], then the temperature given in degrees Celsius is:

[tex]T_{C} = 1.4\,K-273[/tex]

[tex]T_{C} = -271.6\,^{\circ}C[/tex]

The temperature at which rhenium becomes superconducting is -271.6 ºC.

The  concentration (in M) of SO₂ in the wine : c. 3.9 x 10⁻³

Given

Reaction

SO2(aq) + 2H2O(l) + I2(aq) → 4H+ (aq) + 21- (aq) + SO42- (aq)

Required

The  concentration (in M) of SO2

Solution

Titration ⇒ mol SO₂ = mol iodine(I)

mol iodine :

=15.62 ml x 0.00501 M

=0.078256 mlmol

From equation, mol ratio of of SO₂ : I₂ = 1 : 1, so mol SO₂=0.078256

The concentration of SO₂(in 20 ml sample) :

M = n/V

M = 0.078256 mlmol/20 ml

M = 0.0039128

M = 3.9 x 10⁻³

Answer:

YIKES. a bit late. Answers include 1, 2, 3

Explanation:

Kp/Kc = RT

Given

Reaction

A(g) ⇌ C(g)+B(g)

Required

Kp/Kc

Solution

For reaction :

pA + qB ⇒ mC + nD  

[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]

While the equilibrium constant Kp is based on the partial pressure  

[tex]\large {\boxed {\bold {Kp ~ = ~ \frac {[pC] ^ m [pD] ^ n} {[pA] ^ p [pB] ^ q}}}}[/tex]

The value of Kp and Kc can be linked to the formula '  

[tex]\large {\boxed {\bold {Kp ~ = ~ Kc. (R.T) ^ {\Delta n}}}}[/tex]

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

Δn=moles products - moles reactants or

number of product coefficients-number of reactant coefficients  

For reaction :

A(g) ⇌ C(g)+B(g)

number of product coefficients = 1+1=2

number of reactant coefficients   = 1

Δn= 2 - 1 =1

So Kp/Kc = RT

Answer:

The manner in which objects will move is determined by the answer to this question. Unbalanced forces will cause objects to change their state of motion

Explanation:

Since these two forces are of equal magnitude and in opposite directions, they balance each other.

Answer:

balance force are those force whose resultant force is zero and unbalanced force are those whose resultant are non zero

Answer:

When converting from liters to moles or moles to liters, you will use the equality 1 mole=22.4 L for a gas at STP.

If you have moles and want to convert to (Volume) liters, 1 mole = 22.4 L is the conversion factor that can be used.

The area that any three-dimensional solid occupies is known as its volume. These solids can take the form of a cube, cuboid, cone, cylinder, or sphere. Various forms have various volumes. We have studied the several solids and forms that are specified in three dimensions, such as cubes, cuboids, cylinders, cones, etc., in 3D geometry. We will discover how we can determine the volume for each of these shapes. One mole of any gas have 22.4 L at STP.

1 mole = 22.4 L

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Answer:

1.593 moles

Explanation:

Therefore, 1.593 moles are equal to 89.23 g of calcium oxide.

Answer:

9.64 × 10²³ molecules

Explanation:

Given data:

Mass of calcium oxide = 89.23 g

Number of molecules = ?

Solution:

First of all we will calculate the number of moles of calcium oxide.

Number of moles = mass/molar mass

Number of moles = 89.23 g/ 56.1 g/mol

Number of moles = 1.6 mol

Number of molecules;

1 mole contain 6.022 × 10²³ molecules

1.6 mol × 6.022 × 10²³ molecules / 1mol

9.64 × 10²³ molecules

The number 6.022 × 10²³ is called Avogadro number.

Answer:

D.

Explanation:

INCREASE OF SOLAR WINDS When the sun is more active

Answer: mass

Explanation:

Answer:

Estoy triste, tuve que regalar a mi perro

Answer:

Option 2, 3, and also 6 btw

Explanation:

The other guy was wrong

Answer:

Part 1-B

Part 2-D

Part 3-A

Answer:

1.B

2.D

3.A

Explanation:

.......................

Answer:

Hey okau

Explanation:

X/100% = part / whole

X/100% = 1.62 / (1.62 + 4.81) = 0.252

X = 25.2%

Answer:

436.55841 grams.

Explanation:

The molecular formula for Iron(III) Iodide is FeI3. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Iodide, or 436.55841 grams.

You use the 1 / 436.55841 conversion rate. This is different for each element, according to the stoichiometry tables. Iron(II) oxide would be 2/3 of the 1/436.55841 conversion rate, that is, multiplying the fraction to denominator.

Answer:

D

Explanation:

The volume of carbon monoxide is produced when 1.20 L of dicyanoacetylene reacts is

Stoichiometry of any reaction tells about rhe relative amount of substance present before and after the completion of any chemical reaction.

Given balanced chemical reaction between dicyanoacetylene and ozone to produce carbon monoxide and nitrogen is:

3C₄N₂ + 4O₃ → 12CO + 3N₂

From the stoichiometry of the reaction it is clear that:
3 liters of C₄N₂ =  produces 12 liters of CO

1.20 liters of C₄N₂ =  produces 12/3×1.20=4.8 liters of CO

Hence option (d) is correct i.e. 4.8 liters.

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Answer:

CsNO₃

Explanation:

The reactants are:

         Cesium chloride  = CsCl

          Silver nitrate  = AgNO₃

Products:

           Silver chloride  = AgCl

The other product:

 Now;

        CsCl  +    AgNO₃  →  AgCl  + ?

The other product is CsNO₃

So;

      CsCl  +    AgNO₃  →  AgCl  +    CsNO₃

Given

Reaction

C+02 = CO2

Required

The equilibrium constant

Solution

The equilibrium constant is the ratio of concentration or pressure between the product and the reactant with each reaction coefficient raised  

The equilibrium constant is based on the concentration (Kc) in a reaction  

pA + qB -----> mC + nD  

[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]

So for the reaction :

C+O₂ ⇔ CO₂

[tex]\tt Kc=\dfrac{[CO_2]}{[C][O_2]}[/tex]

Answer:

1: false

2: B

Explanation:

I do not know the 3rd one

Answer:

Salinity

HOPE THIS HELPS! :)

Explanation:

Answer:

The waves travel in a direction parallel to direction of the vibration of the medium

The waves travel in a direction parallel to direction of the vibration of the medium

A mechanical wave is defined as an oscillation of matter which is responsible for energy transfer via  medium.

The propagation of  wave is limited by the medium of transmission, the oscillating material which revolve around a fixed point with little translational motion.

A surface wave which is an example of  mechanical wave that propagate  along the interface of two different media in physics. other common examples are Gravity waves on the surface of liquids, ocean waves.

Surface wave can be propagated in a slow way through Earth material and are generally lower in frequency than body waves.

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Answer:

Gravitational force between two objects depends on: a. The weight of the objects c. The mass of each object b. The distance between the objects d. Both b and c Please select the best answer from the choices provided A B C D

✓d

The number of moles left = 0.0067 moles

Given

0.28 g CO

2 x 10²¹ molecules removed

Required

Number of moles left

Solution

Initial mol of CO(MW=28 g/mol) :

mol = 0.28 : 28

mol = 0.01

The number of molecules in 0.01 mol :

= 0.01 x 6.02 x 10²³

= 6.02 x 10²¹

2 x 10²¹ molecules removed, so molecules left :

= 6.02 x 10²¹ - 2 x 10²¹

= 4.02 x 10²¹

moles of 4.02 x 10²¹ :

= 4.02 x 10²¹ : 6.02 x 10²³

= 0.0067 moles

Answer:

Freezing points for water with freezing mixtures based on salt and ice: Ammonium Nitrate - Chrushed Ice or Snow in Water 1 part Ammonium Nitrate - 0.94 parts Ice/water : temperature -4 o C 1 part Ammonium Nitrate - 1.20 parts Ice/water : temperature -14 o C

Explanation: