list the compounds in decreasing boiling point order. ch3ch2ch3 ar ch3cn a. ch3ch2ch3 > ar > ch3cn b. ch3ch2ch3 > ch3cn > ar c. ar > ch3ch2ch3 > ch3cn d. ch3cn > ch3ch2ch3 > ar e. ar > ch3cn > ch3ch2ch3

New moon is when the Moon cannot be seen because we are looking at the unit half of the Moon.

The new moon phase occurs when the Moon in directly between the Earth and Sun. A solar eclipse can only happen at new moon.

A waxing crescent moon is when the Moon looks like crescent and the crescent increases ("waxes") in size from one day to the next. This phase is usually only seen in the west.

The first quarter moon (or a half moon) is when half of the lit portion of the Moon is visible after waxing crescent phase. It comes a week after new moon.

A waxing Gibbous moon occurs when more than half of the lit portion of the Moon can be seen and the shape increases ("waxes") in size from one day to the next. The waxing gibbous phase occurs between the first quarter and full moon phases.

A full moon is when we can see the entire lit portion of the Moon.

The total lunar eclipse when the Moon is on the eclipse can only happen at opposite side of the Earth from the Sun, called opposition.

A lunar eclipse can only happen at full moon.

A waxing gibbous moon occurs when more than half of the lit portion of the Moon can be seen and the shape decreases ("waxes") in size from one day to the next. The waning gibbous phase occurs between the full moon and third quarter phases. after th

The full moon generally occurs on the 14th day after the new moon phase. The full moon occurs when the position of the earth is between the moon and the sun in a relatively straight line. The entire sunlit side of the moon becomes visible so that on a full moon, the moon looks completely round and very bright.

During the full moon many parts of the Moon can be seen from Earth, and most of it is the surface form in the form of craters. Because at full moon, some of the craters on the surface of the moon look like there are emission lines coming from the center of the crater.

These lines come from the scattering of particles that were thrown up when meteorites fell to the surface of the moon and formed craters.

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less than the force of gravity from mars to earth

Answer: 307.923

Explanation: Im not sure but thats my best guess. :p

The aromatic ring in phenacetin exhibits an AB pattern because it has two mutually coupled nuclei that are unrelated to other protons or whose shift differences is equal to the coupling constant.

Deshielding occurs for the ring protons of benzene due to their larger chemical shift (7.3 ppm vs. 5.6 ppm for the vinylic protons in cyclohexene) and the fact that the magnetic field induced outside of the ring is the same orientation as that of the external field.

Protons are present in benzene at levels of 6–8 ppm.This value is larger than that of the protons in those other hydrocarbon like alkanes & alkenes because of the aromatic ring's deshielding effect.

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The theoretical yield of Acetylsalicylic acid is found out to be: 3.01 grams.

The limiting reagent is a substance that prevents a chemical reaction from occurring completely.

When a limiting reagent is used in a chemical reaction, the atoms, molecules, or ions of the other reactant that it (the limiting reagent) reacts with will either stay free or unreacted.

Popular compounds called acids and bases interact with one another to create salt and water. The Latin word "acere," which meaning "sour," is where the term "acid" originates.

According to the problem, we have 2.31 grams of salicylic acid. We need to determine the theoretical yield of acetylsalicylic acid.

The molar mass of salicylic acid is 138.12 g/mol. Therefore, the number of moles of salicylic acid we have is:

n = mass / molar mass

n = 2.31 g / 138.12 g/mol

n = 0.0167 mol

According to the balanced equation, 1 mole of salicylic acid reacts with 1 mole of acetic anhydride to produce 1 mole of acetylsalicylic acid. Therefore, the number of moles of acetylsalicylic acid produced is also 0.0167 mol.

The molar mass of acetylsalicylic acid is 180.16 g/mol. Therefore, the theoretical yield of acetylsalicylic acid is:

mass = n x molar mass

mass = 0.0167 mol x 180.16 g/mol

mass = 3.01 g

Therefore, the theoretical yield of acetylsalicylic acid is 3.01 grams.

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Answer:

92.4%

Explanation:

The volume per cubic meter of sodium preoccupy by the sodium ions is

\(V_{Na} = n \times V\)

where;

volume (V) of each Na atom   = \(\dfrac{ 4}{3} \pi r^3\)

Radius of each ion = 97.3 pm = 97.3 × 10⁻¹²

no.of atoms in the sample n =  mass of the sample / ( molar mass / NA)

mass of the sample per cubic metre =  911 kg/m³

∴

\(V = \bigg [ \dfrac{4}{3} \pi r^3 \bigg ] \bigg [\dfrac{MN_A}{m} \bigg ]\)

\(V = \bigg [ \dfrac{4}{3} \pi (97.3 \times 10^{-12} )^3 \bigg ] \bigg [\dfrac{ (911 kg/m^3 (m^3))(6.023\times 10^{23})}{27.7 \times10^{-3}\ kg/mol } \bigg ]\)

V = 0.07643 m³

The fraction of available conduction electrons are;

= (1 - V)

= 1 - 0.07643

= 0.92357

≅ 92.4%

Answer:

Substances over 7 are categorized as basic, with 7 being the neutral point. Water has a pH level of 7. Substances with pH levels under 7 are categorized as acidic. Vinegar is acidic.

Explanation:

You can change it a little if you want. Hope this helps!

Vinegar is acidic. The only vinegar that has alkaline is apple cider vinegar, but all types of vinegar are acidic.

Answer:

cannot be measure

Hope this helps :) !!!

Answer:

(1) Ca (3) Mg(2) K (4) Zn

Explanation:

will react most rapidly

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.

Explanation:

hope this help

Answer:

Explanation:

H+ = 1 X 10^-7.41 = 3.89 X 10^ -8

POH = 14-7.41 = 6.59

OH- = 1 x 10 ^-6.59 = 2.57 X 10^ -7

The [H+] and [OH−] concentrations of the solution are approximately 2.38 × 10^(-7) M, and the pOH is 6.59.

The pH of a solution is a measure of the concentration of hydrogen ions ([H+]) in the solution. The pH scale ranges from 0 to 14, with a pH of 7 considered neutral. A pH of 7.41 indicates that the solution is slightly basic. To calculate the [H+], [OH−], and pOH of the solution, we can use the relationship:

pH + pOH = 14

Given that the pH is 7.41, we can subtract it from 14 to find the pOH:

pOH = 14 - 7.41 = 6.59

Since pH + pOH = 14, we can also determine the [OH−] by taking the antilogarithm of the pOH value:

[OH−] = 10^(-pOH)

[OH−] = 10^(-6.59)

[OH−] ≈ 2.38 × 10^(-7) M

Since the solution is neutral, the concentration of [H+] will be equal to the concentration of [OH−]:

[H+] = [OH−] ≈ 2.38 × 10^(-7) M

Therefore, the [H+] and [OH−] concentrations of the solution are approximately 2.38 × 10^(-7) M, and the pOH is 6.59.

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Answer: 79420J or 79.420 Kj

Explanation:

q=mc(t2-t1)

250g x 4.18J/g K x (98C-22C)= 79420J

Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer:

One experiment that shows that gas has a low density is the displacement of water by a gas. To do this experiment, take a container filled with water and place a balloon filled with gas (such as hydrogen or helium) on top of the water. The balloon will displace the water, and the amount of water displaced will be equal to the volume of the balloon. This experiment shows that gases have a lower density than liquids, since the balloon is able to displace a greater volume of water than its own volume.

Answer:

19656J

Explanation:

Step 1:

Data obtained from the question.

Mass (M) = 78g

Initial temperature (T1) = 20°C

Final temperature (T2) = 80°C

Change in temperature (ΔT) = T2 – T1 =

80°C – 20°C = 60°C

Specific heat capacity (C) = 4.2J/g°C

Heat (Q) =...?

Step 2:

Determination of the heat required for the reaction.

Q = MCΔT

Q = 78 x 4.2 x 60

Q = 19656J

Therefore, 19656J of heat is required.

Answer:

The second one

Explanation:

Because not only did I take a castle learning in this today but c2h4 has 6 covalent bonds

There are several types of molecules that have multiple bond. A molecule of which compound has a multiple covalent bond is C2H4.

Covalent bonding is the sharing of one or more electron pairs. In many covalent bonding situations,

Multiple chemical bonds exist when there is more than one electron pair that is being shared.

A nitrogen atom often fill its octet by sharing three electrons with another nitrogen atom thereby creating three covalent bonds.

Multiple bonds are commonly found in organic compound and they have carbon molecules.

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Air escape from a tire when tire valve is opened because the pressure from the weight of the car is forcing the already pressurized air out .

When air is filled in tires, it get into more compact area than the outer atmosphere, therefore particles in tire are close to each other and exert pressure continuously on tire walls to get out of it. Thus, material of the tire need to be pressure resistant as much possible.

After opening the tire valve, air starts leaving with huge sound as strain outside the tire is weaker than that inside the tire. Molecules strike with the same force on larger area and pressure starts diminishing.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Air leaves a tire when the tire valve is opened because

A. the pressure outside the tire is lower than the pressure inside the tire.

B. the pressure outside the tire is greater than the pressure inside the tire.

C. the temperature is higher outside the tire than inside the tire.

D. there are more gas particles outside the tire than inside the tire.

a. The rate law for this reaction is: Rate = k[Cl] [H₂]. This means that the rate of the reaction is directly proportional to the concentrations of both Cl and H₂ molecules.

Rate law is an equation that describes the rate of a chemical reaction as a function of the concentrations of reactants. The rate law allows us to describe how the rate of a reaction changes when the concentrations of reactants are changed. It is derived from the rate equation, which is a mathematical expression that can be used to calculate the rate of a reaction from the concentrations of the reactants and the rate constant.

b. The rate law for this reaction is: Rate = k[O] [Os]. This means that the rate of the reaction is directly proportional to the concentrations of both O and Os molecules.
c. The rate law for this reaction is: Rate = k[NO₂]₂. This means that the rate of the reaction is directly proportional to the square of the concentration of NO₂ molecules.

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Complete Question:

Answer:

water water is liquid and water is wet and it is soft and hard

Substituting the given values, we have (0.5 L) / (220 + 273.15 K) = V₂ / (313.15 K).Solving for V₂, we get V₂ = (0.5 L) * (313.15 K) / (220 + 273.15 K).

Calculating this expression, the volume of the balloon when fully cooled by your refrigerator would be approximately 0.38 liters when rounded to two decimal places.To convert Celsius to Kelvin, we need to add 273.15 to the Celsius temperature. Therefore, the temperature inside your refrigerator of 40 degrees Celsius is equivalent to 313.15 Kelvin.Now, let's consider the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.Since the number of moles and pressure remain constant, we can write  the equation as V₁/T₁ = V₂/T₂, where V₁ is the initial volume of the balloon, T₁ is the initial temperature, V₂ is the final volume, and T₂ is the final temperature.

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Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, given elements can be classified as  compound and molecules.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

SO₂, N₂O5,  CH₁ , Kerr,  LiF are compound

O₂,  O\(_3\), P4 are molecules

Sg, Cs, O, S are neither molecules nor compounds

Therefore, given elements can be classified as  compound and molecules.

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The mass percent formulas is given as :

mass percent = ( mass of the solute / mass of the solution ) × 100 %

The mass is generally represented in the grams. the mass percent percent mean the weight percent or w/w %. the mass formula is given as follows :

mass percent = ( mass of the solute / mass of the solution ) × 100 %

let us take an example if mass of solute = 7 g and the mass of solvent = 367 g.  the mass percent is given as :

mass of solution = 7 + 367 = 374 g

mass percent = ( mass of the solute / mass of the solution ) × 100 %

                      = (7 / 374) × 100 %

                      = 1.86 %

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Answer:

Generally the ice should be more than 4 inches thick to skate on it safely. However, the ice thickness is not always even and there can be thin spots, especially near springs or near river inlets or outlets. Most lakes and ponds don't completely freeze because the ice (and eventually snow) on the surface acts to insulate the water below. Our winters aren't long or cold enough to completely freeze most local water bodies. This process of lakes turning over is critically important to the life in the lake.

Explanation:

Answer: velocity

Explanation: trust me man

Answer:

The most recent Global Burden of

Disease (GBD) study estimates that air pollution – indoor and outdoor combined – was the cause of 5.5 million premature deaths

globally in 2013. Air pollution also has further consequences on human health, leading in particular to an increasing number of

respiratory and cardiovascular diseases. Moreover, it affects crop yields and the environment, with impacts on biodiversity and

ecosystems, amongst others. These impacts have significant economic consequences, which will affect economic growth as well as welfare

Explanation:

Using hypothetical scenario: Observations and Conclusions: Snow is associated with high relative humidity. Low air temperature essential for snow formation. High air pressure is  good for snow.

Rain:  Relative humidity promotes rain. Moderate air temperatures often occur during rain. Rain is linked to moderate air pressure. High air temperatures often cause thunderstorms. Low air pressure increases thunderstorm chances.

Fog: High humidity leads to fog. Low air temps cause fog. Moderate air pressure can cause fog. High air pressure = clear skies. In all, weather is affected by humidity, temperature, and pressure. Knowing factors explains weather conditions like snow, rain, thunderstorms, fog, and clear skies.

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Section II: Observations and Conclusions. (20 pts.)

Table (30 pts.)

Weather Phenomenon/

Snow

Pattern

Rain

Thunderstorm

Fog

Clear skies

Factors

Relative Humidity

Air Temperature

Air Pressure

Answer:

\(\fbox{c = - 4.01 \: joule/g°C}\)

Step by step explanation:

Given:

Mass of given sample (m) = 2.50 g

Initial temperature (T1) = 25°C

Final temperature (T2) = 20°C

Heat Energy Q = 12 cal

To find:

\(Specific \: Heat \: c = \: ?\)

Solution:

We know that,

Specific heat of any substance is directly proportional to the mass and change in temperature.

Represented by equation,

\(Q = mc \triangle T\)

Where,

Q = Heat Energy

m = mass of given sample

c = specific heat

∆T = change in temperature

Substituting corresponding values,

\(Q = mc \triangle T \\ 12 = 2.5\times c \times (20-25) \\ c = \frac{12}{2.5 \times ( - 5)} \\ c = - 0.96 \: cal/g°C \\ \)

We also know that,

\(1 \: cal = 4.184 \: joules\)

multiplying above answer by 4.184,

\(c = - 0.96 \times 4.184 \\ \fbox{c = - 4.01 \: joule/g°C}\)

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Answer:

Explanation:

The law of conservation of mass states that mass is neither created nor destroyed during a chemical reaction. This can be gleaned from the third postulate in Dalton's series. Magnesium oxide decomposes into magnesium and oxygen. If 4.03 g of magnesium oxide decomposes to form 2.43 g of magnesium, what mass of oxygen gas is also released in the reaction

The word say magnesium oxide decomposes to magnesium and oxygen

the chemical symbols say

MgO-----------> Mg + O2  (since natural oxygen is diatomic)

the balanced  equation says

2MgO-------------->2Mg + O2

4.03 gm----------> 2.43 + ?0 gms

tour high school Algebra I class says

? = 4.03 -2.43 =1.60

your chemical analytcal lab says %mO in MgO = 16/40.3 = 39.7%

your calculator says

39.7/100 X 4.03 = 1.60

all of these prove the law of conservation of mass