__Hgo > __Hg + __O2?​

easy to compare

easy in calculation

adjust to units commonly used in certain places

the answer is is is is is is is is is is is is is is

Answer:

-second

Explanation:

6-ethyl-2-octyne is an unsaturated compound with a triple bond.

6-ethyl-2-octyne will have a triple bound attached to the second carbon. The suffix -yne suggests that compound carry a triple bond and the number  "2" before suffix refers to the position of triple bond that is second carbon.

Hence, the correct option is  "-second ".

we need 247.6 g of KOH to produce 305 g of K₂CO₃.

The balanced chemical equation is:

2KOH(s) + CO₂(g) → K₂CO₃(s) + H₂O(l)

The molar mass of KOH is:

K: 39.10 g/mol

O: 15.99 g/mol

H: 1.01 g/mol

KOH: 39.10 + 15.99 + 1.01 = 56.10 g/mol

To find the mass of KOH required, we need to use stoichiometry. From the balanced chemical equation, we can see that 2 moles of KOH react to form 1 mole of K₂CO₃.

1 mole of K₂CO₃ has a molar mass of:

K: 39.10 g/mol

C: 12.01 g/mol

O: 15.99 g/mol

K₂CO₃: 2(39.10) + 12.01 + 3(15.99) = 138.21 g/mol

Thus, 305 g of K₂CO₃ is equal to:

305 g / 138.21 g/mol = 2.206 moles of K₂CO₃

From the stoichiometry of the balanced equation, we know that 2 moles of KOH are required for every mole of K₂CO₃ produced. Therefore, we need:

2.206 mol K₂CO₃ × 2 mol KOH / 1 mol K₂CO₃ = 4.412 mol KOH

Finally, we can convert the moles of KOH to grams:

4.412 mol KOH × 56.10 g/mol = 247.6 g KOH

Therefore, we need 247.6 g of KOH to produce 305 g of K₂CO₃.

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Answer:

5.25 grams of potassium sulfate will get crystallize out.

Explanation:

Solubility of potassium sulfate at 40 °C = 15 g/100 g

This means that at 40 °C 15 g of potassium sulfate will get completely dissolved in 100 of water.

39.0 g of potassium sulfate to 225 g water, carefully heating the solution.

Amount of potassium sulphate will get dissolve in 225 g of water at 40 °C will be:

\(\frac{15g}{100g}\) × 225 = 33.75g

Amount of potassium sulfate precipitated out by the solution:

= 39.0 g-33.75 g = 5.25 g

At 40 °C 5.25 g of potassium sulfate will get precipitate out from the solution which means that solution is saturated.

Saturated solution are solution in which solute is dissolved in maximum amount. Further addition of solute results in precipitation of solute form the solution.

5.25 grams of potassium sulfate will get crystallize out.

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Answer:

0.04 mole or 1.23 g

Explanation:

1 mole of P has 6.02 x 10^23 atoms

so quantity in moles of P of 2.40 x 10^22 atoms equal

1 mole x (2.40 x 10^22)/(6.02 x 10^23)

= 0.03986710963 or 0.04 mole

1 mole of P = 6.02 x 10^23 atoms = 30.97 g

2.40 x 10^22 atoms weights

(30.97)(2.40 x 10^22)/(6.02 x 10^23)

= 1.23468438538 or 1.23 g

This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.  

i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.

ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.

b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.

c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.

d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.

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Answer:

\(0.688M\)

Explanation:

Hello,

In this case, it is widely acknowledged that strong bases usually correspond to those formed with metals in groups IA and IIA which have relatively high activity and reactivity, therefore, when they are dissolved in water the following dissociation reaction occurs (for calcium hydroxide):

\(Ca(OH)_2\rightarrow Ca^{2+}+2OH^-\)

In such a way, for the same volume, we can compute the concentration of hydroxyl ions by simple stoichiometry (1:2 molar ratio):

\(0.344\frac{molCa(OH)_2}{L}*\frac{2molOH^-}{1molCa(OH)_2} \\\\0.688\frac{mol OH^-}{L}\)

Or simply:

\(0.688M\)

Regards.

In Newton's second law, unbalanced or net forces cause an object to accelerate.

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be expressed as F = m × a

Where:

F is the net force acting on the object,

m is the mass of the object,

a is the acceleration produced in the object.

This law describes the relationship between force, mass, and acceleration. The greater the force applied to an object, the greater its acceleration. The greater its mass, the smaller its acceleration for the same force.

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Answer:

Explanation:

Since the moles of gas and temperature are held constant the new volume can be found by using the formula for Boyle's law

\(V_2 = \frac{P_1V_1}{P_2} \\\)

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

From the question

P1 = 1 atm

P2 = 2.25 atm

V1 = 250 mL

We have

\(V_2 = \frac{250 \times 1}{2.25} = \frac{250}{2.25} \\ = 111.1111111...\)

We have the final answer as

Hope this helps you

Answer: I believe the answer is A, heat moves from warmer objects to cooler objects. I know for sure it isn’t C or D though so A

The heat is transferred from one object to another as heat moves from warmer objects to cooler objects. The correct option is A.

There are three ways to transfer heat. They are conduction, convection, and radiation. Heat travels from one body to another body. If the temperature of two objects is different, then the heat travels from higher temperature to lower temperature.

Conduction is the transfer of energy when two objects ate in contact with each other. Convection is a transfer between object and environment. Radiation is when transferred by emission of electromagnetic radiation.

Thus, the correct option is A. Heat moves from warmer objects to cooler objects.

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The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

D). The average speed of gas particles at T2 is lower than the average speed of gas particles at T1

Explanation:

I took the test :)

The statements is likely to be true is that the average speed of gas particles at T2 is lower than the average speed of gas particles at T1.

This can be defined as a pictorial representation or a diagram that represents data or values in an organized manner.

According to the graph, the average speed of gas particles at T2 is lower than the average speed of gas particles at T1 which makes option D the most appropriate choice.

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The molarity of the final solution is 1.00 M.

The molarity of the final solution when a student dissolved 36.8 grams of KF into 1.2 L of water is 1.00 M.Molarity is a unit of concentration that measures the amount of a solute present in a solution. Molarity is defined as the number of moles of solute per liter of solution.

The formula for molarity is given as;Molarity (M) = moles of solute / liters of solution.The following steps should be followed to calculate the molarity of a solution:Convert the mass of the solute to moles using its molar mass.Divide the number of moles of solute by the volume of the solution in liters.

The volume of the solution in liters can be measured in any units (mL, L, etc.).

Example:A student dissolved 36.8 grams of KF into 1.2 L of water.

Mass of KF = 36.8 gMolar mass of KF = 58.1 g/mol

Number of moles of KF = mass / molar mass= 36.8 / 58.1= 0.632 M

Divide the number of moles of solute by the volume of the solution in liters= 0.632 M / 0.6 L= 1.00 M

Therefore, the molarity of the final solution is 1.00 M.

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Answer: D. Fusion reactions in the sun convert small amounts of mayter into large amounts of energy.

Invasive species can do all sorts of damage to an existing ecosystem, including changing habitats and starving native animals of food and resources.

An invasive species is an organism that causes ecological or economic harm in a new environment where it is not native.

Invasive species can change the food web in an ecosystem by destroying or replacing native food sources. The invasive species may provide little to no food value for wildlife. Invasive species can also alter the abundance or diversity of species that are important habitats for native wildlife.

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Answer:

First drop down is non-native, the second drop down is native

Explanation:

Got it right on the test. An invasive species is not from the area, therefore it is non-native.

Explanation:

pls the question is not clear to me

The reaction quotient from the calculation is obtained as  12.3

The reaction quotient, Q, is a mathematical expression used in chemistry to predict the direction a chemical reaction will proceed under non-standard conditions.

It is calculated in the same way as the equilibrium constant, K, but uses the concentrations (or partial pressures) of the reactants and products at any given moment during a reaction, rather than at equilibrium.

We already know that the reaction quotient would refer to the non equilibrium conditions. Thus we have that;

Q = [N₂04]/[NO₂]^2

Q = 0.00553/(0.0212)^2

Q = 12.3

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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:

The answer is

Explanation:

The Density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \)

From the question

mass of rock = 12.34 g

volume = final volume of water - initial volume of water

volume = 54.5 mL - 50 mL = 4.5 mL

So the density is

\(density = \frac{12.34}{4.5} \\ = 2.744444444...\)

We have the final answer as

Hope this helps you

The best explanation for the increase in the number of plants with long, narrow flowers over time is option D: Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.

In this population, short, wide flowers are better suited for bee pollination, while long, narrow flowers are more suitable for hummingbird pollination. Over time, the plants with long, narrow flowers produce more seeds compared to those with short, wide flowers.

This happens because the hummingbirds, which are the main pollinators for long, narrow flowers, are more effective in transferring pollen between these flowers. As a result, the long, narrow flower individuals have a higher reproductive success and pass on their traits to the next generation

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False, using changes in tempo and dynamics can make a musical cliché more effective. Hence, option C is correct.

Tempo in a music refers to pace of the music especially in high pitch sound waves. The most common unit of measurement for tempo is beats per minute (BPM), which is just the quantity of beats that may be captured in a minute at a certain pace.

A musical segment or composition is slower when the beats per minute  is lower than when the BPM is greater. While a higher BPM is more likely to make the listener feel excited, a lower BPM is more likely to have a calming and/or sad effect on the listener.

Changing dynamics is some more effective way to make musical cliché. Hence, option C is correct.

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Answer:

sharp clever bright

Explanation:

s

Answer:

will you friend me please

Answer:

When a star bigger than our sun, Collapse a black hole may" formed. Most of the time when a star collapse it explodes and this explosion is called "Super Nova".

Explanation:

i hope this helps you

The answer is .747

There are 5 main rules to determining what are and what are not significant figures.

NOTE: In any measurement, the last digit is always assumed to be estimated.

The number of significant figures retained may not exceed the least number of digits in either of the factors. There will always be the same number of significant figures in the answer as the factor with the least amount of digits.

Given:

\(9.635 /12.9 =?\)

In the given problem, the number with the least amount of digits is 12.9. As we recall from above, all non-zero numbers are significant, therefore all of these numbers are significant. Hence, we should have 3 significant figures in our final answer.

Now we use a calculator to simply calculate the above and we obtain:

\(0.7468992248\)

We want to have 3 significant figures, so we will take the first 3 significant figures in that answer, .746, and use that. We apply rounding properties and obtain our final answer of .747.

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Answer:

because they react with other gases of atmosphere and pollute the environment

Answer:

el volumen es igual a masa decidida por densidad

The mass of NaCl in 44mL of a 1.6M solution is 4.1grams.

The mass of NaCl can be calculated by using the following formula;

Molarity = no. of moles ÷ volume

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

no of moles = 1.6M × 0.044L = 0.07moles

The mass of the sodium chloride solution can be calculated by multiplying the molar mass of the salt by the number of moles present in the solution.

The molar mass of NaCl solution can be calculated as follows;

M.M = 23g/mol + 35.5g/mol = 58.5g/mol

mass of NaCl = 58.5 × 0.07 = 4.1grams.

Therefore, 4.1grams is the mass of NaCl solution.

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1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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Water is a tiny molecule.

it consists of three atoms : two of hydrogen and one of oxygen. Water molecules cling to each other because of a force called hydrogen bonding.