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.

Answer:

Molecular solid

Explanation:

A molecular solid has a low melting point, they are soft and do not conduct electricity.

We have been told in the question that the solid does not really dissolve in water and it's solution does not improve the electrical conductivity of water. Hence, it must be a molecular solid.

Answer:

Sr + 02 Right arrow.2Sr0

Answer:

b

Explanation:

Answer:

Copper(II) Chlorite = Cu(ClO2)

Explanation:

how you write the compound is very important as well

Money spend = $103.86

Given

Distance :123 km/day

cost 1.1 euros/L

your car's gas mileage is 27.0mi / gal

Required

Money needed

Solution

Distance/week : 123 x 7 = 861 km/week

1 km = 0.621 miles, so for 861 km =

861 x 0.621 = 534.68 miles/week

Amount of gas : 534.68 miles : 27 miles/gal = 19.8 gal

1 gal = 3.785 L , so 19.8 gal =

19.8 x 3.785 = 74.94 L

Cost for euros = 74.94 x 1.1 = 82.43

Cost for dollars = 82.43 x 1.26 = $103.86

Answer:

Two types of technology and the energy transformation that occurs within those types of technology  that make them work is described below in detail.

Explanation:

A drone, in technological courses, is an unmanned aircraft. ... Typically, a drone is a hovering automaton that can be remotely commanded or cruise autonomously through software-managed flight systems in their installed systems, working in combination with onboard sensors and GPS.

Laptops consolidate all the input/output parts and abilities of a desktop processor, including the presentation screen, tiny speakers, a keyboard, a data storehouse device, sometimes an optical disc drive, aiming devices, with a running system, a processor, and memory into a particular unit.

Answer:

I'm pretty sure c......

Answer is B

The friction causes the ball to lose energy on carpets, which makes the ball bounce less. On hard floors, not as much thermal energy is lost, which is why it bounces higher.

Answer:

D. CH3CH2COO- for CH3CH2COOH; H2PO4 - for H3PO4.

Explanation:

Hello!

In this case, since the ionization of a weak acid produces a conjugate acid, molecule to which the leaving H⁺ is added to, and a conjugate base, everything that remains after the withdrawal of the H⁺, we can note down the ionization of each acid down below:

[tex]CH_3CH_2COOH\rightleftharpoons CH_3CH_2COO^-+H^+\\\\H_3PO_4\rightleftharpoons H^++H_2PO_4^-[/tex]

Thus, we notice that the answer is D. CH3CH2COO- for CH3CH2COOH; H2PO4 - for H3PO4 because the phosphoric acid is most likely to ionize to dihydrogen phosphate ions rather than phosphate, or hydrogen phosphate ions it undergoes a stepwise ionization in which the first step is the predominant one.

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Answer: 32.4 C

Explanation: Gay-Lussac's Law or Third Gas Law states that for a constant volume, the pressure is directly proportional to absolute temperature: P alpha T; also stated as P/T = K, where K is a constant, and similarly, P1/T1 = P2/T2 .

Here P1= 100 kPa, P2=120 kPa (If pressure increases by 20 kPA), T1=27 C [Given]

Hence, T2= (T1*P2)/P1 = (27*120)/100=32.4 C [C is degree in Celcius]

The new temperature of the gas in the container when the pressure increased by 20 KPa is 87 °C

The new temperature of the gas can be obtained as follow:

P₁ / T₁ = P₂ / T₂

100 / 300 = 120 / T₂

Cross multiply

100 × T₂ = 300 × 120

Divide both side by 100

T₂ = (300 × 120) / 100

T₂ = 360 K

Subtract 273 to obtain answer in °C

T₂ = 360 – 273 K

T₂ = 87 °C

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Answer:

Molar mass of the substance

Answer:

D.

Explanation:

The Oil spill effects on environments and habitats can be catastrophic: they can kill plants and animals, disturb salinity/pH levels, pollute air/water and more. Read more about the types of oil pollution.

Statements that express occurrences as a result of oil spill in the ocean are:

C: I. The levels of salt and other nutrients typically present in ocean water would greatly increase.

III. Humans would be less able to use fish and shellfish from the affected area as food.

especially the marine ecosystem, due to human activity, and is a form of pollution.

Therefore option C is correct.

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Answer:

Well, electrons can be converted into a atomic number so if SE atomic number is 34 that means it has 34 electrons. AI has a atomic number of 13 meaning it has 13 electrons. So the difference is that SE has more electrons then AI.

Answer:

Ba(NO₃)₂  +  Na₂SO₄   →  BaSO₄ + 2NaNO₃

q = 3.93 kJ

ΔH_{rxn} =  26.2 kJ/mole

Exothermic

Explanation:

Given that:

The Volume of Ba (NO₃)₂ = 100.0 mL

The molarity of Ba (NO₃)₂ = 1.50 M

The volume of Na₂SO₄ = 100.0 mL

The molarity of Na₂SO₄ = 1.50 M

From the above, the total volume of solution = 200.0 mL

Density of solution = 1 g/mL

The balanced equation can be written as:

Ba(NO₃)₂  +  Na₂SO₄   →  BaSO₄ + 2NaNO₃

We know that:

Density = mass/volume

Thus;

the mass of the solution = density × volume

= 200 × 1

= 200 g

Temperature change ΔT = T₂ - T₁

ΔT = (29.7 - 25)° C

ΔT = 4.7° C

Heat capacity c = 4.184 J/gK

∴

The amount of heat lost or gained q = m× c×ΔT

q = 200 × 4.184 × 4.7

q = 3932.96 J

q = 3.93 kJ

From the above information, we can determine the number of moles of Ba(NO₃)₂ and  Na₂SO₄

For Ba(NO₃)₂

number of moles = 0.10 × 1.50

= 0.15

For Na₂SO₄

number of moles = 0.10 × 1.50

= 0.15

∴

ΔH_{rxn} = q/number of moles

ΔH_{rxn} = 3.93/0.15

ΔH_{rxn} =  26.2 kJ/mole

From the reaction, we will notice that the temperature increased. This significantly implies that heat is evolved from the reaction. As such, the reaction is exothermic.

Answer:

fat provide 9 calories per gram

Answer:

C)0.19 mol/L .

Explanation:

Hello!

In this case, since the chemical reaction between sodium hydroxide and sulfuric acid is:

[tex]H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O[/tex]

Whereas a 1:2 mole ratio is seen between the acid and the base, we can write:

[tex]2*M_{acid}V_{acid}=M_{base}V_{base}[/tex]

In such a way, we solve for the concentration of base and plug in to obtain:

[tex]M_{base}=\frac{2*M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{2*0.13mol/L*14.9mL}{20mL} \\\\M_{base}=0.19mol/L[/tex]

Thus, the answer is C)0.19 mol/L

Best regards!

Answer:

[tex]-2.58\times 10^6[/tex]

[tex]-4.18\times 10^{-2}[/tex]

[tex]-5.29\times 10^{-5}[/tex]

Explanation:

The absolute value of a number is the value of the number without the sign. So, the absolute value of [tex]-1[/tex] is [tex]1[/tex] and [tex]1[/tex] is also [tex]1[/tex].

It is generally denoted in the following way [tex]|-1|=1[/tex]

Here the numbers are

[tex]|-2.58\times 10^6|=|-2580000|=2580000[/tex]

[tex]|-4.18\times 10^{-2}|=|-0.0418|=0.0418[/tex]

[tex]|-5.29\times 10^{-5}|=|-0.0000529|=0.0000529[/tex]

So, the order of the numbers  from greatest to the least is

[tex]-2.58\times 10^6[/tex]

[tex]-4.18\times 10^{-2}[/tex]

[tex]-5.29\times 10^{-5}[/tex]

Answer:

isopropanol + oxygen Right arrow. carbon dioxide + water + heat

Explanation:

Word equation:

isopropanol + oxygen    →   carbon dioxide + water + heat

Chemical equation:

2C₃H₇OH  + 9O₂       →     6CO₂ + 8H₂O + Heat

The given reaction is combustion of isopropanol. Isopropanol burn in the presence of oxygen and produced carbon dioxide and water. Heat is also produced in this reaction.

The given reaction also follow the law of conservation of mass. There are equal number of moles of each element on both side of reaction equation thus mass remain conserved.

isopropanol + oxygen Right arrow. carbon dioxide + water + heat

The following information should be considered:

Word equation:

isopropanol + oxygen    →   carbon dioxide + water + heat

Chemical equation:

[tex]2C_3H_7OH + 9O_2 \rightarrow 6CO_2 + 8H_2O + Heat[/tex]  

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Answer:

Samples A and B are mixtures

Explanation:

For sample A, we were told that the initial density of the solution is 0.77/gmL. After distillation, the liquid left has a density of 1.04/gmL. Apparently, A is a mixture of liquids.

As for sample B, the spread of the chromatogram resulting in different colours show that the sample B is not pure. It is a mixture of substances. A pure sample will yield only a single spot.

Answer:

B hope it helps

Explanation:

Answer:

See explanation

Explanation:

According to Louis de Broglie, matter has an associated wavelength. He was the first scientist to establish the idea of wave-particle duality or wave- particle paradox.

The display of wavelike properties by objects in the universe is dependent on the magnitude of the of the mass of the body. Small objects have a large associated wavelength and can be described completely by quantum mechanics.

A buckyball with a mass of 1.2 x 10-21 g, 0.7 nm wide, moving at 38. m/s has a very small mass and significant associated wavelength hence the system can be completely described by quantum mechanics.

When recommending solutions to decrease human impact, which location were you able to make the greatest positive impact? Please explain your selection by using data from the simulation.

New york, 893 - 853 = 40 which is the highest quotient.  

What recommendations would you give to your local community to help to decrease the local effects of human impact on the environment? List 2 recommendations and how they will positively impact your community.

Installing solar panels and replanting 2 trees for every tree that’s been cut down, this will help the atmosphere and deforestation.  

What recommendations would you give to the global governments to help decrease the global effects of human impact on the environment? List 2 recommendations and how they will positively impact our planet.

Constructing using only recycled materials decreases water pollution to 823 ppm and Creating more protected areas decreases air pollution to 368 ppm this will help the environment and oxygen.  

Answer:

........

Explanation:

Answer:

1.44 g/mL

Explanation:

total mass is mass of the flask plus mass of the solution

TM = Flask + H2O2

88.5 = 16.5 + x

x = 72.0 gram

density = mass/volume

H2O2 density = 72/50

= 1.44 g/mL

Answer:

CaCl2 (aq) + K2CO3(aq) ---------> CaCO3(s) + 2KCl(aq)

Explanation:

We have the reactants as calcium chloride and potassium carbonate. Recall that we are expecting that the reaction will yield a precipitate. We must keep that in mind as we seek to write its balanced chemical reaction equation.

So we now have;

CaCl2 (aq) + K2CO3(aq) ---------> CaCO3(s) + 2KCl(aq)

Recall that the rule of balancing chemical reaction equation states that the number of atoms of each element on the right side of the reaction equation must be the same as the number of atoms of the same element on the left hand side of the reaction equation.

Answer:

7x10⁴.

Explanation:

Hello!

In this case, when rounding big number to a representation with less significant figures than it, we need to make sure we remove the spare figures and round up whether the next digit is five or more.

In such a way, for 74,000, we notice that 4 is not enough to round up the 7, that is why the number would contain a 7 only; moreover, to get rid of the thousand places, we need to introduce an exponent in 4 places, which means that the result would be:

7x10⁴.

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Explanation:

Let the mass of the compound be 100g.

There are 60.2g of sulfur.

Moles of sulfur

= 60.2g / (32.07g/mol) = 1.877mol

There are 100g - 60.2g

= 39.8g of manganese.

Moles of manganese

= 39.8g / (54.94g/mol) = 0.724mol

Mole ratio of manganese to sulfur

= 0.724mol : 1.877mol = 1 : 2.5.

Answer:

it’s probably c

Explanation:

Answer:

C

Explanation:

I searched it up

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: a. Millimeter

Explanation:

A paperclip is a small device or instrument that can be used to hold the papers or stack of papers together. The length of the paperclip can be measured using millimeter. It is equal to the thousands of meters. The millimeter is a dimension which is used to measure the very small length objects which have visible scale distances and length.

Decimeter can be used to measure the length of the object smaller than paperclips. Meter and kilometers are used for objects and distances larger than paperclip.