Mechanical waves require a medium to travel. If there is no
medium, the mechanical wave doesn't travel. Since, they are waves; they have a
wavelength, frequency, speed and
also amplitude. The speed depends on the medium and type of the wave. An example
for the mechanical waves is sound wave.
2. E = hf, where E is energy, h is plank constant and f is the frequency. Hence, if the frequency is high, then the energy is high.
v = fλ , where v is the speed, f is the frequency and λ is the wavelength. If the frequency is high, then the wavelength is low.
According to the given choices, gamma rays have the shortest wavelength and highest energy on electromagnetic spectrum.
3. The wavelength of X-rays are smaller the wavelength of infrared.
According to the v=fλ, lower the wavelength, then higher the frequency. According to the E = hf, if the frequency is high, then the energy is also high.
Hence, the correct answer is "d"
4. In a longitudinal wave (compression wave) the particles of a matter move parallel.
There are two types of waves according to the particle movement. They are transverse waves and longitudinal waves. In transverse waves, the particles of the medium move perpendicular to the direction of the wave and longitudinal waves have parallel movement of particles to the direction of wave.
5. In regard to spend of sound, sound travels slowest in gases.
Solids have the highest speed of sound while gases have the lowest. This is because of the particle arrangement of each phase. Solid phase has very tightly packed particle arrangement and due to that the transfer of sound wave in easy than in gases.
Helium gas has a molar mass of 4 g/mol. oxygen gas has a molar mass of 32 g/mol. how much faster or slower would helium effuse than oxygen from a small opening
Which of the following classes of organic compounds has COOH as the functional group
Alkane
Carboxylic acid
Aldehyde
Ether
Carboxylic acid is an organic compound that has COOH as the functional group.
What are functional groups?
Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.
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PLEASE HELP NOW!!!!!!!
What is the number of moles hydrogen produced when 6 moles of sodium are used?
2Na + 2H2O -> 2NaOH + H2
A percent composition analysis yields 46.7% nitrogen and 53.3% oxygen. What is the empirical formula for the compound
Answer:NO
Explanation:
it just is
Ethyl acetate is a sweet-smelling solvent used in varnishes and fingernail polish remover. it is produced industrially by heating acetic acid and ethanol together in the presence of sulfuric acid, which is added to speed up the reaction. the ethyl acetate is distilled off as it is formed. the equation for the process is as follows.
Ethyl acetate is a solvent used in varnishes and nail polish remover, and it is produced by heating acetic acid and ethanol in the presence of sulfuric acid. It is also used to extract caffeine from coffee and to remove nail polish and paint.
Explanation:Ethyl acetate is a sweet-smelling solvent used in varnishes and fingernail polish remover. It is produced industrially by heating acetic acid and ethanol together in the presence of sulfuric acid, which is added to speed up the reaction. The ethyl acetate is distilled off as it is formed.
Ethyl acetate (CH, CO₂C₂H5) is the solvent in many fingernail polish removers and is used to decaffeinate coffee beans and tea leaves. It is prepared by reacting ethanol (C₂H5OH) with acetic acid (CH₂CO₂H); the other product is water. A small amount of sulfuric acid is used to accelerate the reaction, but the sulfuric acid is not consumed and does not appear in the balanced chemical equation.
Esters are common solvents. Ethyl acetate is used to extract organic solutes from aqueous solutions-for example, to remove caffeine from coffee. It also is used to remove nail polish and paint.
Calculate the energy transferred in joules when 29.5g of liquid water decreases from 14c to 0.0c
The ka of hf is 6.8 x 10-4. what is the ph of a 0.35 m solution of hf?
write the proper word equation to express the following chemical reaction: 3Li (s) + AuCI3 (aq) -> 3LiCI (aq) + Au(s)
Which two layers of Earth are mainly composed of metallic elements such as nickel and iron, which are abundant in meteoroids and comets?
This layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel about 1,400 miles. The lava is mostly made up of iron and nickel. The outer core creates the Earth's magnetic field. The final layer is the inner core, which is 900 miles deep. Scientists believe the inner core is a solid ball of iron and other minerals.
In an ionic bond:
A. The atoms swap electrons.
B. Both atoms share their electrons.
C. The atoms attract each other but their electrons do not interact.
D. One atom accepts electrons from another.
Answer:
One atom accepts electrons from another.
Explanation:
Answer via Educere/ Founder's Education
An excited state of a particular atom has a mean lifetime of 6.2×10−10 s , which we may take as the uncertainty δt.
Why is the molar solubility of silver chloride lower in an aqueous solution of silver nitrate than in pure water?
Which one of the following compounds is not covalent?
A. HCI
B. S2CI2
C. KCI
D. SCI2
(P.S. The answer turned out to be C. KCI)
Answer:
KCl
Explanation:
Hello,
Potassium chloride is well-known as an ionic compound owing to the shown-below greater-than-1.7 difference between the electronegativities of potassium and chlorine:
[tex]\Delta E=E_{Cl}-E_K=3.16-0.82\\\Delta E=2.34[/tex]
This is by cause of the fact that such compounds that have a difference in the constituent elements' electronegativities greater than 1.7 are considered as ionic.
Best regards.
How many different isomers can be derived from ethylene if two hydrogen atoms are replaced by a fl uorine atom and a chlorine atom? draw their structures and name them. indicate which are structural isomers and which are geometric isomers?
What is the lowest possible value of n for a d atomic orbital?
A 50.0-ml volume of 0.15 m hbr is titrated with 0.25 m koh. calculate the ph after the addition of 14.0 ml of koh. express your answer numerically.
To find the pH after adding 14.0 mL of 0.25 M KOH to 50.0 mL of 0.15 M HBr, calculate the excess HBr and then use its concentration to determine the pH, assuming HBr dissociates completely as it's a strong acid.
Explanation:To calculate the pH after the addition of 14.0 mL of 0.25 M KOH to 50.0 mL of 0.15 M HBr, we first need to determine if the reaction has reached the equivalence point. The millimoles of HBr initially present are calculated by multiplying the volume in liters by the molarity: 50.0 mL x 0.15 M = 7.5 mmol. Then, calculate the millimoles of KOH added: 14.0 mL x 0.25 M = 3.5 mmol.
Since we have more HBr than KOH, HBr is in excess and KOH is the limiting reactant. The excess amount of HBr is 7.5 mmol - 3.5 mmol = 4.0 mmol. The pH is determined by the concentration of the remaining HBr. To find this concentration, we take the remaining mmol of acid and divide by the total volume of the solution in liters (original acid solution plus the volume of KOH added).
The total volume after the addition of KOH is 50.0 mL + 14.0 mL = 64.0 mL or 0.064 L. The concentration of HBr is 4.0 mmol / 0.064 L. Now, convert mmol to mol by dividing by 1000, resulting in 4.0 x 10-3 mol / 0.064 L. Since HBr is a strong acid, it dissociates completely in water. The pH can be calculated using the formula pH = -log[H+], where [H+] is the concentration of hydronium ions, which is equal to the concentration of HBr.
Therefore, the pH is -log(4.0 x 10-3 / 0.064 L). Calculate this value to get the pH of the solution after the addition of 14.0 mL of KOH.
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The osmotic pressure of a solution formed by dissolving 45.0 mg of aspirin (c9h8o4) in enough water to make 0.250 l of solution at 25°c is ________ atm
The osmotic pressure of the solution can be calculated using the formula Π = MRT. First, convert the mass of aspirin to moles, then calculate the molarity by dividing the moles by the volume. Finally, calculate the osmotic pressure using the molarity, ideal gas constant, and temperature.
Explanation:The osmotic pressure of a solution can be calculated using the formula:
Π = MRT
Where Π is the osmotic pressure, M is the molarity of the solution, R is the ideal gas constant, and T is the temperature in Kelvin.
In this case, we are given the mass of aspirin and need to calculate the molarity to determine the osmotic pressure.
First, we need to convert the mass of aspirin to moles:
45.0 mg x (1 g/1000 mg) x (1 mol/180.16 g) = 0.000249 mol
Next, we need to calculate the molarity:
M = moles/volume = 0.000249 mol/0.250 L = 0.000996 M
Finally, we can calculate the osmotic pressure:
Π = (0.000996 M)(0.0821 L. atm/mol. K)(298 K) = 0.0246 atm
What volume of hydrogen will be produced at STP by the reaction of 78.33 g of aluminum with excess water
The reaction of 78.33 g of aluminum with excess water will produce approximately 97.44 L of hydrogen gas at standard temperature and pressure.
Explanation:The reaction of aluminum with water produces hydrogen gas. To determine the volume of hydrogen that will be produced, you have to use stoichiometry.
Firstly, we need to convert the mass of aluminum to moles of aluminum using its atomic mass (26.98 g/mol). So, 78.33 g Al * (1 mol Al / 26.98 g Al) = ~2.90 moles of Al.
Secondly, we use the balanced chemical reaction for the reaction of aluminum with water, which is 2Al + 6H2O -> 2Al(OH)3 + 3H2. This shows us that for every 2 moles of Al reacted, 3 moles of H2 are produced.
Therefore, if we have 2.90 moles of Al, it would produce (2.90 moles Al * 3 moles H2 / 2 moles Al) = ~4.35 moles of H2.
Finally, at STP conditions, 1 mole of any gas occupies a volume of 22.4 L. Therefore, 4.35 moles of H2 will occupy (4.35 moles H2 * 22.4 L/mol) = 97.44 L of H2.
So, the reaction of 78.33 g of aluminum with excess water will produce approximately 97.44 L of hydrogen gas at STP.
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What type of bond would occur between carbon (C) and nitrogen (N)?
A. Metallic bond
B. Ionic bond
C. Paired bond
D. Covalent bond
A compound contains 46.7% nitrogen and 53.3% oxygen by mass. What is the empirical formula of the compound?
What volume does 43.5 g of n2 occupy at stp? (r = 0.08206 l⋅atm/mol⋅k)?
V =
n·R·T / p.
V(N₂) = 1.55 mol · 0.08206 L·atm/mol·K · 273 K /
1.00 atm.
V(O₂) = 34.72 L.
A 100.0 ml sample of 0.10 m ca(oh)2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 400.0 ml hbr. the chemical equation is below. ca(oh)2 (aq) + 2hbr (aq) → cabr2 (aq) + h20 (l)
Calcium carbonate reacts with hydrobromic acid to form calcium bromide, carbon dioxide, and water according to the reaction below. what is the molarity of the hydrobromic acid if 250.0 ml of it reacts with 5.64 grams of calcium carbonate?
Ammonium nitrite undergoes decomposition to produce only gases as shown below. nh4no2(s) → n2(g) + 2h2o(g) how many liters of gas will be produced by the decomposition of 32.0 g of nh4no2 at 525°c and 1.5 atm?
Approximately 32.77 liters of gas will be produced by the decomposition of 32.0 g of NH4NO2 at 525°c and 1.5 atm.
Explanation:Decomposition of 32.0g of NH₄NO₂ can be calculated by using the Ideal Gas Law PV=nRT where P is the pressure, V is the volume, n number of moles, R the gas constant and T temperature. Given the molar mass of NH₄NO₂ is about 64.04 g/mol, we divide 32.0g by 64.04 g/mol to get 0.5 moles of NH₄NO₂ The reaction of NH₄NO₂ decomposing to N₂ and H₂O shows that for every 1 mole of NH₄NO₂ , 1 mole of N₂ and 2 moles of H2O are produced. Thus, in total, by decomposing 0.5 moles of NH₄NO₂ we produce 0.5 * 3 = 1.5 moles of gases at 525 °C and 1.5 atm.
Applying these values into the Ideal Gas Law, substituting R for the value of 0.0821 (when pressure is in atm, volume in L, and T in kelvin), and noting that 525°C is equivalent to 798.15 K (273.15 + 525 = 798.15), we get V = (1.5*0.0821*798.15)/1.5. By solving this, we get the volume of gasses to be approximately 32.77 liters.
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Where do water and hydrochloric acid (hcl) lie on the ph scale in relation to each other?
Water has a neutral pH of 7 on the pH scale, while hydrochloric acid is a strong acid with a pH of around 1 to 2, indicating a much higher level of acidity than water.
On the pH scale, water and hydrochloric acid (HCl) lie at different points reflecting their levels of acidity. Water is neutral with a pH of 7, serving as the midpoint of the pH scale.
In contrast, hydrochloric acid is a strong acid with a pH significantly lower than 7; typically around 1 to 2 due to its high concentration of hydronium ions. The lower the pH value, the more acidic the substance is. Hence, hydrochloric acid has a much higher acidity than water.
Which formula represents an organic compound?cah2c4h8h2o2p2o5?
Final answer:
C4H8 is the formula that represents an organic compound among the given options because it contains both carbon and hydrogen atoms.
Explanation:
To determine which formula represents an organic compound, we must identify a compound containing carbon (C) with some hydrogen (H). Typically, organic compounds have carbon-hydrogen bonds and often contain other elements like oxygen, nitrogen, sulfur, and phosphorus.
Looking at the options provided:
CAH2 - Calcium hydride, an inorganic compound.
C4H8 - This is a hydrocarbon with four carbon atoms and eight hydrogen atoms, which is characteristic of an organic compound.
H2O2 - Hydrogen peroxide, an inorganic compound.
P2O5 - Diphosphorus pentoxide, an inorganic compound.
Therefore, C4H8 is the formula that represents an organic compound, as it consists of carbon and hydrogen atoms, meeting the criteria for organic chemistry.
When the hydroxyl group, like in the image below, is attached to a carbon compound, the organic compound is a(n)
A hydrogen atom covalently bonded to an oxygen atom, which is covalently bonded to a carbon in the carbon chain.
carboxylic acid.
alcohol.
ether.
ketone.
This tea kettle shows a change in the state of matter of water. Which part of the water cycle represents the same change in state?
Answer:
The answer to the question you asked, "This tea kettle shows a change in the state of matter of water. Which part of the water cycle represents the same change in state?", is D. Lake water evaporates into the atmosphere.
Explanation:
The process of evaporation refers to the changing state of water from liquid to gaseous (vapor) state.
In the given condition, a tea kettle is placed, where the water evaporates due to the increased amount of heat provided to it. This allows the water to evaporate into the atmosphere forming water vapor.
One of the cases that shows a similar changing state of water is the evaporation of the lake water due to the high absorption of solar energy, that releases water vapor into the atmosphere.
Thus, the correct answer is option (D).
What volume of so2 is produced at 325 k and 1.35 atm when 15.0 grams of hcl reacts with excess k2so3?
First, the balanced chemical reaction between HCl and K2SO3 is figured out. Then, using the molar mass of HCl, the number of moles are calculated. Finally, using the ideal gas law, the volume of SO2 produced is calculated as around 5.61 litres.
Explanation:First, we need to figure out the balanced chemical reaction. The reaction of HCl with K2SO3 produces KCl, H2O, and SO2. The balanced reaction equation would look like this: 2HCl + K2SO3 -> 2KCl + H2O + SO2.
Next, we need to find out how many moles of HCl we have. 15.0 grams of HCl is around 0.411 moles (since molar mass of HCl is approximately 36.46 g/mol). According to the balanced reaction, for every 2 moles of HCl, we get 1 mole of SO2. Hence, our 0.411 moles of HCl would produce around 0.205 moles of SO2.
Finally, to find the volume of SO2 produced we can use the ideal gas law: PV=nRT. Given: Pressure(P) = 1.35 atm, Gas constant(R) = 0.0821 L.atm/(mol.K), Temperature(T) = 325K. By substituting these values in the ideal gas law, we get the volume (V) as 5.61 Litres.
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What is the ph of a solution with [h3o+] = 1 × 10-9 m?
The pH of a solution with a hydronium ion concentration of 1 × 10-9 M is 9, indicating that the solution is basic.
Explanation:The pH of a solution is calculated by taking the negative logarithm of the hydronium ion concentration ([H3O+]). In this case, the hydronium ion concentration is given as 1 × 10-9 M. To find the pH of the solution, you would use the following equation:
pH = -log [H3O+]
In this example:
pH = -log(1 × 10-9)
Therefore, the pH is 9.
Since pH values less than 7.0 are acidic, values greater than 7.0 are basic, and a pH of 7.0 is neutral, this solution with a pH of 9 is considered basic.