1) 25.00 mL of .200 M HNO2 is titrated to its equivalence point with 1.00 M NaOH. What is the pH at the equivalence point?
2) What is the pH at the equivalence point when 50.00 mL of a .150 M solution of acetic acid (CH3COOH) is titrated with .10 M NaOH to its end point?
3) A 25.0 mL sample of a .290 M solution of aqueous trimethylamine is titrated with a .363 M solution of HCl. Calculate the pH of the solution
a) after 10.0 mL of acid have been added:
b) after 20.0 mL of acid have been added:
c) after 30.0 mL of acid have been added:
*pKb of (CH3)3N=4.19 at 25 degrees C.11
4) Your job is to determine the concentration of ammonia in a commercial window cleaner. In the titration of a 25.00 mL sample of the cleaner, the equivalence point is reached after 16.81 mL of .135 M HCl has been added. What is the
a) initial concentration of ammonia in the solution?
b) pH of the solution at the equivalence point?
Answers
The pH of water indicates how acidic or basic it is.
How to find pH value?1. The moles of equivalence of sodium hydroxide and nitrous acid are as follows:
nNaOH = nHNO₃
= 25.00 x .200
= .005 mol
The added base has a volume of 5.00 mL.
Nitrogen dioxide has a mole of 0.005 and a volume of 30 mL at the equivalence point.
Nitrogen dioxide's molar concentration will be 0.167 M.
The base dissociation constant is calculated using the ICE table as follows:
Kw = Ka x Kb
Kb = 1 x 10⁻¹⁴ / 4.6 x 10⁻¹⁴
= 2.174 x 10⁻¹¹
The base's ionization constant is given as,
Kb = [ HNO₂] [ OH⁻] / [NO₂⁻]
2.174 X 10⁻¹¹ = x² / 0.167 - x
= 1.905 x 10⁻6
pOH is now calculated as follows:
pOH = -log[OH⁻]
= -log(1.905 x 10⁻⁶)
= 5.72
The titration's pH is calculated as follows:
pH + pOH = 14
pH = 14 - 5.72
= 8.27
As a result, the pH is 8.27.
2. Given,
The acetic acid volume = 50.0 mL
The molarity of acetic acid = 0.150 M
The molarity of NaOH = 0.10 M
HA + H2O ⇆ A- + H3O+
Initial concentration is :
[HA] = 0.150 M
[A-] = 0M
[H3O+] = 0M
Concentration at equilibrium
[HA] = 0.150 - x M
[A-] = xM
[H3O+] = xM
Ka = [H3O+][A-] / [HA] = x²/(0.150 -x) = 1.76*10^-5
0.150 >>> x
x²/(0.150) = 1.76*10^-5
x² =0.00000264
x = 0.00162
[H3O+] = 0.00162 M
pH = -log [H3O+] = -log (0.00162) = 2.79
3. a) by adding 10 mL of HCl
moles of (CH3)3N = molarity * volume
= 0.29 m * 0.025 L
= 0.00725M moles
moles of HCl = molarity * volume
= 0.3625 m * 0.01L
= 0.003625 moles
moles of (CH3)3N remaining = moles of (CH3)3N - moles of HCl
= 0.00725 - 0.003625
= 0.003625 moles
the total volume = 0.01 L + 0.025L = 0.035 L
[(CH3)3N] = moles remaining / total volume
= 0.003625 moles / 0.035L
= 0.104 M
pKb = - logKb
4.19 = -logKb
Kb = 6.5 x 10^-5
Kb = [(CH3)3NH+] [OH-] / [(CH3)3N]
by using ICE table :
[(CH3)3NH+] = X & [OH] = X
[(CH3)3N] = 0.104 -X
By substituting:
6.5 x 10^-5 = X^2 / (0.104-X) by solving for X
X = 0.00257 M
[OH-] = X = 0.00257 M
POH = -log[OH]
= -log0.00257
= 2.5
PH = 14 - POH
= 14 - 2.5
= 11.5
b) by adding 20ML of HCL:
The moles of HCl = molarity * volume
= 0.3625 m * 0.02 L
= 0.00725 moles
The neutralization of (CH3)3N we make 0.003625 moles of (CH3)3NH+ So, now we need the Ka value of (CH3)3NH+:
When total volume = 0.02L + 0.025 = 0.045L
∴ [ (CH3)3NH+] = moles / total volume
= 0.003625 / 0.045L
= 0.08 M
When Ka = Kw / Kb
Here, Kb = 6.5 x 10^-5 & we know that Kw = 1 x 10^-14
By substitution:
Ka = (1 x 10^-14) / (6.5 x 10^-5)
= 1.5 x 10^-10
Ka expression = [(CH3)3N][H+] / [(CH3)3NH+]
By substituting:
1.5 x 10^-10 = X^2 / (0.08 - X) solving X
X = 3.5 x 10^-6 M
[H+]= X = 3.5 x 10^-6 M
The PH = -log[H+]
= -log(3.5 x 10^-6)
= 5.5
C) by adding 30ML of HCl:
The no : of moles HCl = molarity * volume
= 0.3625m * 0.03L
= 0.011 moles
The moles of (CH3)3N neutralized = 0.003625 moles
The no : of moles of HCl remaining = moles HCl - moles (CH3)3N neutralized
= 0.011moles - 0.003625moles
= 0.007375 moles
Therefore total volume = 0.025L + 0.03L
= 0.055L
The [H+] = moles / total volume
= 0.007375 mol / 0.055L
= 0.134 M
Therefore the PH = -log[H+]
= -log 0.134
= 0.87
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Related Questions
nitrogen from a gaseous phase is to be diffused into pure iron at 675 c. if the surface concentraion is maintained at 2 wt% n, what will be the concentration 2 mm from the surface after 25 hours? the diffusion coefficient for nitrogen in iron at 675 c is 2.8 x 10^-11 m^2/s.
Answers
The concentration of nitrogen 2 mm from the surface after 25 hours is approximately 0.0198 wt%.
To find the concentration of nitrogen 2 mm from the surface after 25 hours, we can use Fick's second law of diffusion. The formula is given by:
C(x, t) = C0 * erfc((x / (2 * sqrt(D * t)))
Where:
C(x, t) is the concentration at a distance x from the surface at time t
C0 is the initial concentration at the surface
erfc is the complementary error function
D is the diffusion coefficient
x is the distance from the surface
t is the time
Given:
Initial concentration, C0 = 2 wt% = 0.02
Diffusion coefficient, D = 2.8 x 10^-11 m^2/s
Distance from the surface, x = 2 mm = 0.002 m
Time, t = 25 hours = 25 * 3600 seconds = 90000 seconds
Substituting these values into the formula:
C(0.002, 90000) = 0.02 * erfc((0.002 / (2 * sqrt(2.8 x 10^-11 * 90000))))
Evaluating this equation, we find that the concentration of nitrogen 2 mm from the surface after 25 hours is approximately 0.0198 wt%.
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Directions: Answer each of the questions below.
1. Explain how andesite forms.
2. Explain the difference between magma and lava and how lava is formed.
3. Identify some special characteristics of pumice.
4. What are cinder cones and how are they formed.
5. Explain how most continental volcanoes are formed.
Answers
Andesite is a fine-grained intermediate igneous rock of volcanic origin that is mostly composed of plagioclase feldspar.
It is fine-grained due to the rapid cooling of magmas when they erupt onto the Earth's surface and form lava flows. Andesite is formed by magma with less quartz (silica) than rhyolite but more than basalt.
Magma is molten matter within the earth that is the source of lava flows, etc., whereas lava is molten rock that a volcano removes from its crater or fissured sides. Magma is formed when mantle rocks partially melt.
Pumice is a light, porous pyroclastic igneous rock formed during explosive volcanic eruptions when liquid lava is ejected as a froth containing masses of gas bubbles into water or air.
As the lava solidifies, the bubbles are frozen into the rock. Some special characteristics of pumice is as follows:
It is very lightIt is grey to medium grey in colourIt contains a lot of empty gas bubbles, so it is very light and looks rather like a spongePumice is so light that it will float on waterAround a volcano, there are deposits of conical rock fragments called cinder cones. They are the kind of volcanoes that are generated by pyroclastic debris, such as volcanic ash, lava clinkers, pumice, and hot gases.
Where oceanic crust subducts beneath continental crust, continental volcanoes or a continental volcanic arc are formed.
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Which family of elements is known for their multivalent properties?
Answers
When we have an ionic compound, we have elements with different charges, cations are known for the + charges being carried by them, in this group of elements we found the metals. Within this group of elements, we have monovalent cations (Cs+ for example), divalent cations (Ca2+), but in the transition metals we find multivalent or polyvalent ions, like Fe, that can be Fe2+, Fe3+, and Fe4+, so these elements are able to carry different charges as cations, more examples of these multivalent ions are Copper, Zinc, Manganese, and many more.
an atom of 108in has a mass of 107.909678 amu. calculate the mass defect in amu/atom. enter your answer with 4 significant figures and no units. use the masses: mass of 1h atom
Answers
The mass defect of one atom of 108In is 0.7777 amu.
To calculate the mass defect of an atom, we need to find the difference between the actual mass of the atom and the sum of the masses of its individual particles (protons, neutrons, and electrons) using Einstein's famous equation E=mc².
The mass of the atom of 108In is given as 107.909678 amu. The sum of the masses of its individual particles (protons and neutrons) can be calculated as follows:
mass of 108In nucleus = (107 protons x 1.00728 amu/proton) + (108 - 107 neutrons x 1.00867 amu/neutron)
= 107.13196 amu
Now, using Einstein's equation E=mc², we can find the energy equivalent of the mass defect (∆m) by multiplying the mass defect by the speed of light squared (c²):
∆E = ∆m c²
Since the units of mass and energy are related by c², we can convert the energy into units of mass (amu) by dividing by c²:
∆m = ∆E/c²
Using the values for the mass of the atom and the sum of the masses of its individual particles, we can calculate the mass defect (∆m) as:
∆m = (107.13196 - 107.909678) amu = -0.777718 amu
Therefore, the mass defect of one atom of 108In is 0.7777 amu. Note that the mass defect is negative because the actual mass of the atom is less than the sum of the masses of its individual particles, due to the binding energy that holds the nucleus together.
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specific heat capacity
- Heat capacity represents the amount of heat a substance can absorb or release without changing temperature. Specific heat capacity is the heat capacity per unit of mass of substance.
- the energy required to raise the temperature of one gram of a substance by one degree Celsius
Answers
Specific heat capacity is a property of a substance that represents the amount of energy required to raise the temperature of one gram of that substance by one degree Celsius.
In other words, it tells us how much heat a substance can absorb or release without changing its temperature. Here is a step-by-step explanation:
1. Identify the substance and its specific heat capacity (usually given in units of J/g°C or cal/g°C).
2. Determine the mass of the substance (in grams) and the desired temperature change (in degrees Celsius).
3. Use the formula: Q = mcΔT, where Q is the heat energy absorbed or released, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.
4. Solve the equation for Q to find the amount of energy required or released for the given temperature change.
Remember, specific heat capacity values are unique to each substance and help us understand how different materials react to changes in temperature.
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How many grams of zinc chloride will be produced from 55. grams of zinc assuming hydrochloric acid is available in excess
Answers
Answer:
Mass = 114.5 g
Explanation:
Given data:
Mass of zinc = 55 g
Mass of ZnCl₂ produced = ?
Solution:
Chemical equation:
Zn + 2HCl → ZnCl₂ + H₂
Number of moles of Zn:
Number of moles = mass/molar mass
Molar mass of Zn = 65.4 g/mol
Number of moles = 55 g/ 65.4 g/mol
Number of moles = 0.84 mol
Now we will compare the moles of Zn and zinc chloride,
Zn : ZnCl₂
1 : 1
0.84 : 0.84
Mass of ZnCl₂:
Mass = number of moles × molar mass
Molar mass of ZnCl₂= 136.3 g/mol
Mass = 0.84 mol × 136.3 g/mol
Mass = 114.5 g
Name three perfessinial areas in the u.s thaT use meTric system
Answers
The three professional areas that uses metric system are the scientific fields, medical fields, or technical fields.
What is metric system?The metric system is a measurement method that utilizes the meter, liter, as well as gram as base units for length for distance, capacity for volume, and weight for mass.
The primary factors for the United States' failure to embrace the metric system are simply cost and time.
When the country's Industrial Revolution began, expensive manufacturing plants was becoming a major source of American jobs and basic goods.
Thus, the scientific, medical, and technical fields are the three professional fields that use the metric system.
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A 25 g sample of compound Delta is mixed with a 25 g sample of compound Omicron. A reaction occurs in which a gas is produced. Once the reaction is complete, the final mixture has a mass of 35 g. (a) What is the mass of the gas? (b) What happened to the gas? (c) Does this violate the law of conservation of mass? Why or why not?
Answers
A 25 g sample of compound Delta is mixed with a 25 g sample of compound Omicron. A reaction occurs in which a gas is produced. Once the reaction is complete, the final mixture has a mass of 35 g.
(a) The mass of the gas can be calculated by finding the difference in mass before and after the reaction.
Initial total mass = Mass of compound Delta + Mass of compound Omicron = 25 g + 25 g = 50 g
Final total mass = Mass of the final mixture = 35 g
Mass of the gas produced = Final total mass - Initial total mass = 35 g - 50 g = -15 g
The mass of the gas is -15 g.
(b) The negative mass value indicates an inconsistency or error in the given information. In a chemical reaction, the mass cannot be negative. It is possible that there was a mistake in the measurements or calculations.
(c) Yes, this situation violates the law of conservation of mass. The law of conservation of mass states that the mass of the reactants should be equal to the mass of the products in a chemical reaction. In this case, the total mass after the reaction (35 g) is less than the total mass before the reaction (50 g). This violates the principle of mass conservation, suggesting that there may have been an error in the measurements or a loss of mass during the reaction that was not accounted for.
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Your answer should include all the following pieces of information. Check off each of the items you included in your answer. It contains 11 protons in the nucleus. It contains 12 neutrons in the nucleus. It contains 10 electrons surrounding the nucleus. The number of electrons are calculated from net charge and charge of proton (+1) and electron (–1). 12 neutrons are calculated from atomic number: 11 and mass number: 23.
Answers
The specie that we were asked to identify is the sodium ion.
What is the sodium atom?An atom is the smallest particle of a substance that can take part in a chemical reaction. Now we know that the atom is composed of the electrons, protons and neutrons.
In the sodium ion, there are 10 electrons, 11 protons and 12 neutrons. As such, the mass number of sodium is 23. It then follows that the specie that we were asked to identify is the sodium ion.
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In an open manometer with an atmospheric pressure of 780 mm Hg, the mercury level in the arm connected to the gas is 45 mm Hg higher than in the arm connected to the atmosphere. What is the pressure of the gas sample? (answer in mm Hg)
Answers
The pressure of the gas sample is 825 mm Hg.
How to find the pressure of the gas sample?
In an open manometer, the pressure of the gas sample can be determined by measuring the difference in height of the mercury levels in the two arms of the manometer. The pressure of the gas sample is equal to the difference in height between the two mercury levels, plus the atmospheric pressure.
In this case, the mercury level in the arm connected to the gas is 45 mm Hg higher than in the arm connected to the atmosphere. This means that the pressure of the gas sample is 45 mm Hg higher than the atmospheric pressure.
So, the pressure of the gas sample can be calculated as:
Pressure of gas sample = atmospheric pressure + height difference between the two mercury levels
Pressure of gas sample = 780 mm Hg + 45 mm Hg
Pressure of gas sample = 825 mm Hg
Therefore, the pressure of the gas sample is 825 mm Hg.
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A student in the chemistry lab heated a sample of potassium chlorate solid KCIO, (M=122.55 g/mol). 3 The following reaction took place: 2 KClO 2 KCl +30₂ The oxygen gas (M=32 g/mol) produced was collected at 22 °C and 0.964 atm and of vasume 0.65 L. The mass of KCLO 3 that was decomposed in the above reaction is 0.83 2.12 3.17 28.37 grams.
Answers
The mass of KClO₃ that was decomposed in the given reaction by the ideal gas equation is approximately 7.19 grams.
Given:
Pressure (P) = 0.964 atm
Volume (V) = 0.65 L
Temperature (T) = 22 °C = 22 + 273.15 = 295.15 K
The ideal gas law: PV = nRT
Where:
P = Pressure in atm
V = Volume in liters
n = Number of moles
R = Ideal gas constant = 0.0821 L·atm/(mol·K)
T = Temperature in Kelvin
n = (PV) / (RT)
n = (0.964 atm) × (0.65 L) / (0.0821 L·atm/(mol·K) × 295.15 K)
n ≈ 0.0294 mol
2 moles of KClO₃ produce 1 mole of O₂. Therefore, the number of moles of KClO₃decomposed would be:
Moles of KClO₃= 2 × 0.0294 mol
Moles of KClO₃≈ 0.0588 mol
Molar mass of KClO₃= 122.55 g/mol
Mass of KClO₃= Moles of KClO₃× Molar mass of KClO₃
Mass of KClO₃≈ 0.0588 mol × 122.55 g/mol
Mass of KClO₃≈ 7.19 grams
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Upon hydrogenation, which of the following alkenes releases the least heat per mole?
A) 3,4-dimethyl-1-hexene
B) (Z)-3,4-dimethyl-2-hexene
C) (E)-3,4-dimethyl-2-hexene
D) (Z)-3,4-dimethyl-3-hexene
E) (E)-3,4-dimethyl-3-hexene
Answers
Upon hydrogenation, the alkene that releases the least heat per mole is (E)-3,4-dimethyl-2-hexene. Option (C).
This is because hydrogenation reactions are exothermic, and the heat released is related to the stability of the starting alkene. In this case, the (E) isomer has greater stability due to its less crowded structure, which results in a lower heat release when it is hydrogenated.
The least heat released per mole upon hydrogenation would be the alkene that is most stable. The stability of an alkene is determined by its degree of substitution and the orientation of the substituents. Alkenes with more substituted carbons and cis isomers tend to be more stable. The answer is option C.
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What is the formula Trisilicon tetra nitride
Answers
Tri = 3 -> 3 silicon atoms
Tetra = 4 -> 4 nitrogen atoms
4. The representative particle for an ionic compound is a
Answers
Answer:
unit formula??
Explanation:
How many
sulfur dioxide
molecules are in 2.8 moles of
sulfur dioxide?
[?]×10l21
Answers
The find the number of sulfur dioxide molecules in 2.8 moles of sulfur dioxide, we need to use Avogadro's number. Avogadro's number is defined as the number of atoms, molecules, or particles in one mole of a substance, which is approximately 6.022 × 10²³.
The First, we need to calculate the total number of moles of sulfur dioxide in 2.8 moles. Since sulfur dioxide has a molecular formula of SO₂, each molecule contains one sulfur atom and two oxygen atoms. Therefore, the molar mass of sulfur dioxide is 32.06 g/mol for sulfur plus (2 x 16.00 g/mol) for oxygen, which is equal to 64.06 g/mol. So, 2.8 moles of sulfur dioxide will have a mass of: 2.8 mol x 64.06 g/mol = 179.37 g Now, we can use Avogadro's number to find the total number of molecules in 2.8 moles of sulfur dioxide Number of molecules = Number of moles x Avogadro's number of molecules = 2.8 mol x 6.022 × 10²³ molecules/mol Number of molecules = 1.686 × 10²⁴ molecules Therefore, there are approximately 1.686 × 10²⁴ sulfur dioxide molecules in 2.8 moles of sulfur dioxide.
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Roger heats a brass metal cube (specific heat = 375 J/kg·°C) to 70.0°C and places the cube into an insulated container of water (specific heat = 4182 J/kg·°C). He observes that the water temperature increases from 10.0°C to a final temperature of 18.0°C. What is the final temperature of the metal cube?
Answers
He notices a rise in the water's temperature from 10.0°C to 18.0°C in total. The metal cube's final temperature is 69.04°C.
How can you determine the metal cube's final temperature?Q = mcT, where Q is the heat dissipated by the cube, m is its mass, c is its specific heat, and T is its change in temperature.
The formula for the energy the water gains is Q = mcT.
mcT = mcT (cube) (water)
When we solve for the cube's final temperature, we obtain:
Tcube = (m cube c cube) / (m water c water)
Tcube is equal to (18.0°C - 10.0°C) 1 kg times 4182 J/kg°C and 1 kg times 375 J/kg°C
Tcube equals 0.96 °C
Final temperature: 70 °C minus 0.96 °C equals 69.04 °C.
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What products would you expect from the reaction of ammonia and sulfuric acid in aqueous solution
Answers
Answer:
(NH4)2SO4
Explanation:
2NH3(aq) + H2SO4 (aq) ---> (NH4)2SO4(aq)
Ammonia reacts with sulfuric acid to give the fertilizer ammonium sulfate.
Connect it!
Summarize ways in which human health might be improved and harmed if
there were no bacteria. Sc.6.L.14.6
Answers
1.How many grams of zinc Zn and oxygen O2 will be needed to form 324 grams of ZnO after the reaction?
Answers
Answer: pretty sure its 0.214 moles * 40.3g/mole = 8.6g (2 sig figs) of MgO, and
0.035 moles * 40.3g/mole = 1.4g of MgO
Explanation:
Does the reaction between sodium
and chlorine indicate a CHEMICAL or a
PHYSICAL change in matter?
Answers
The reaction between sodium
and chlorine is NaCl which is physical change
I need help trying to explain this.
"Explain the relationship between Worldwide Earthquake Distribution and Geologic Forces."
Answers
Worldwide earthquake distribution and geologic forces are closely related. Earthquakes are caused by geologic forces that build up energy within the earth's crust and release it suddenly in the form of seismic waves.
What is the relationship?The earth's crust is made up of several plates that are in constant motion. When two plates move towards each other, one plate may be pushed beneath the other in a process known as subduction. This can cause the build-up of pressure and the formation of faults or fractures in the crust, which can lead to earthquakes.
The distribution of earthquakes worldwide is largely determined by the location of these tectonic plate boundaries. For example, most earthquakes occur along the Pacific Ring of Fire, which is an area around the Pacific Ocean where several tectonic plates meet. The Mid-Atlantic Ridge, which is the boundary between the North American and Eurasian plates, is another area where earthquakes are common.
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When using a water-cooled condenser, the water should Choose... make this happen, the water should flow in at the
Answers
When using a water-cooled condenser, the water should flow in at the lower part of the condenser and leave from the upper part. Here's the main answer and for your question:
When using a water-cooled condenser, the water should flow in at the lower part of the condenser and leave from the upper part. When using a water-cooled condenser, it is essential to note that the water should flow in at the lower part of the condenser and leave from the upper part. This is due to the fact that the liquid refrigerant is generally heavier than the gas refrigerant.
As a result, the liquid will fall to the bottom of the condenser, where it will be cooled by the circulating water. The refrigerant will subsequently evaporate and exit from the upper part of the condenser as a gas.This flow is critical since if the water were to enter the condenser at the top and leave from the bottom, the liquid refrigerant would be prevented from evaporating and exiting the condenser. As a result, the condenser would become flooded, which would severely impede its efficiency.
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which one of the following contains 52% carbon by mass?which one of the following contains 52% carbon by mass?ch4ch3ch2ch3co2ch3och3c2cl2
Answers
The compound that contains 52% carbon by mass is CH₃OCH₃ or dimethyl ether.
To determine which compound contains 52% carbon by mass, we need to calculate the molar masses and the percentage of carbon in each compound.
The molar mass of each compound is as follows:
CH₄ (Methane): 12.01 g/mol (carbon) + 4(1.01 g/mol) (hydrogen) = 16.04 g/mol
CH₃CH₂CH₃ (Propane): 3(12.01 g/mol) (carbon) + 8(1.01 g/mol) (hydrogen) = 44.11 g/mol
CO₂ (Carbon dioxide): 12.01 g/mol (carbon) + 2(16.00 g/mol) (oxygen) = 44.01 g/mol
CH₃OCH₃ (Dimethyl ether): 2(12.01 g/mol) (carbon) + 6(1.01 g/mol) (hydrogen) + 16.00 g/mol (oxygen) = 46.08 g/mol
C₂Cl₂ (Dichloroethene): 2(12.01 g/mol) (carbon) + 2(35.45 g/mol) (chlorine) = 94.97 g/mol
Next, we'll calculate the percentage of carbon in each compound:
CH₄: (12.01 g/mol / 16.04 g/mol) × 100% ≈ 74.98% carbon by mass
CH₃CH₂CH₃: (3 × 12.01 g/mol / 44.11 g/mol) × 100% ≈ 32.50% carbon by mass
CO₂: (12.01 g/mol / 44.01 g/mol) × 100% ≈ 27.29% carbon by mass
CH₃OCH₃: (2 × 12.01 g/mol / 46.08 g/mol) × 100% ≈ 52.01% carbon by mass
C₂Cl₂: (2 × 12.01 g/mol / 94.97 g/mol) × 100% ≈ 25.29% carbon by mass
Based on these calculations, the compound CH₃OCH₃ or dimethyl ether contains approximately 52% carbon by mass.
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Explain why they should ban Cell phones in some places?
Answers
Answer:
Reasons for Banning Mobile Phones in Public Places
Phones can disturb others when they are concentrating, for example in a library. They are antisocial as people are too busy sending messages to talk to the people in front of them, for example in a shop when they are being served.
Why do you think the elements are arranged the way that they are?
Answers
copy and paste Explanation: the reason that elements are arranged the way they are is that it makes them easier to comprehend, find, and understand.
The chemical elements are arranged this way because: they are grouped based on their atomic number (number of protons), for easy identification and predicting their ability to bond with other elements.
A periodic table can be defined as an organized tabular array of all the chemical elements typically arranged in order of increasing atomic number or number of protons (in rows).
Basically, a periodic table comprises eighteen (18) columns and seven (7) rows.
Groups, which are the families of chemical elements are represented by the vertical rows on the periodic table
On the other hand, the periods of chemical elements are represented by the horizontal columns.
Generally, the chemical elements are arranged this way because they are grouped based on their atomic number (number of protons), for easy identification and predicting their ability to bond with other elements.
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Below which statement about the several types of molecular interactions is correct? a. hydrogen bonding belongs to dipole-induced dipole interaction
b. hydrophobic interaction explains why water has a high density c. hydrogen bond belongs to ion-ion Interaction d. hydrophobic interaction explains why phospholipids form a lipid bilayer
e. van der Waals force is stronger than ionic bond
Answers
Hydrophobic interaction explains why phospholipids form a lipid bilayer. The correct statement is d.
Hydrophobic interaction is the tendency of nonpolar substances to aggregate in the presence of polar substances such as water. This interaction is responsible for the formation of the lipid bilayer in cell membranes, which is made up of phospholipids with hydrophobic tails and hydrophilic heads.
Hydrogen bonding belongs to the category of intermolecular interactions known as hydrogen bonding, which involves a partially positive hydrogen atom and a partially negative atom such as oxygen or nitrogen. Ion-ion interaction involves the attraction of oppositely charged ions. Van der Waals force is a weak intermolecular force that arises from fluctuating electron densities around atoms or molecules and is weaker than ionic bonds.
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Thompson changed out the
metal and still consistently
observed the same cathode ray.
What did this observation mean
for atomic theory?
A. The atomic is a small hard sphere.
B. The atom is indivisible.
C. The atom contained something small and
negative.
D. The atom is mostly empty space.
Answers
Thompson's model concluded that the atom contained something small and negative. The correct option to this question is C.
What is Thompson's model?Thomson's description of the atomic model is one of many scientific models of the atom. Created by J.J. Thomson in 1904, shortly after the electron was discovered. However, the atomic nucleus had not yet been discovered at that time. So he proposed a model based on the known properties available at the time. Known properties are:
Atoms are neutrally charged
Inside an atom are negatively charged particles called electrons. According to the assumptions of Thomson's atomic model, an atom resembles a positively charged sphere with electrons (negatively charged particles) inside.
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Which of these has the lowest first-ionization energy?
A) Cs
B) Ag
C) Pb
D) Br
E) Se
Answers
Answer:
Francium is the answer
Plisss help I’ll give you brainless Waves can be identified in many different ways. Using the diagram below, identify
which property of a wave is shown by the part of the diagram labeled F?
Answers
Answer:
Wavelength
Explanation:
Boreal forests are characterized by _______ trees. A. Creosote b. Eucalyptus c. Coniferous d. Deciduous Please select the best answer from the choices provided A B C
Answers
Answer:
c
Explanation:
coniferous trees, Tianga also called Boreal forest biome (major life zone).
hope it's perfect.
Answer: C is correct.