Answer:
Explanation:
The liquid nitrogen and oxygen are then separated by fractional distillation . The liquefied air is passed into the bottom of a fractionating column. Just as in the columns used to separate oil fractions , the column is warmer at the bottom than it is at the top.
the following except____are examples of neutral oxides.
a. nitrogen (ii) oxide
b. carbon(ii) oxide
c. water
d. nitrogen (i) oxide.
Answer:
a nitrogen oxide
Explanation:
i think
How could the AX3 molecular structure (one central atom with three bonded atoms) be non-polar even with bond dipoles present?
options:
1. If there were no lone pairs on the central atom
2. If there were one lone pair on the central atom
3. If there were two lone pairs on the central atom
4. If there were three lone pairs on the central atom
The AX3 molecular structure (one central atom with three bonded atoms) can be non-polar even with bond dipoles present If there were no lone pairs on the central atom. Option 1 is correct.
The molecular structure or shape is a 3-D pattern showing the arrangement of atoms of a molecule.
The molecular structure of AX3 is said to be composed of a central atom connected and bounded to three atoms which are equally spaced at an angle of 120° towards one another. It has a shape of trigonal planar and its sp² hybridized that does not have any lone pair.
The polarity of a molecule or a compound has to do with the presence of lone pair in the central atom. Since AX3 has no lone pair of electrons in its central atom it is said to be non-polar.
Example of compounds that exhibit AX3 with no lone pair is: BF₃ and CO₃²⁻
Therefore, we can conclude that we've understood what is molecular structure and how to identify the molecular structures that are polar and non-polar in nature.
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he specific rate constant, k, for the following first-order
reaction is 9.16 x 10-3
s
-1 at 0.0°C. The activation energy of
this reaction is 88.0 kJ/mol. Determine the value of k at
2.0°C.
N2O5 NO2 + NO3
Buffer #1: 0.15 M HF(aq) and 0.10 M NaF(aq)
Buffer #2: 0.090 M HF(aq) and 0.060 M NaF(aq)
Fill in the following sentence:
The pH values of Buffers #1 and #2 are _______, and the buffering capacity of Buffer #1 is _______ than that of Buffer #2.
a) unequal; higher
b) equal; lower
c) unequal; lower
d) equal; higher
Buffer #1: 0.15 M HF(aq) and 0.10 M NaF(aq) Buffer #2: 0.090 M HF(aq) and 0.060 M NaF(aq). The pH values of Buffers #1 and #2 are equal, and the buffering capacity of Buffer #1 is higher than that of Buffer #2.
A buffer is a solution that is capable of withstanding changes in pH caused by the introduction of acid or base substances. It may neutralize tiny quantities of additional acid or base, allowing the pH of the solution to remain reasonably constant.
For buffer 1;
[HF] = 0.15 M [NaF] = 0.10 MUnder Standard Conditions, Ka(acid dissociation constant) for HF = 3.5 × 10⁻⁴
pKa = -log Ka
pKa = -log (3.5 × 10⁻⁴)
pKa = 3.454
The formula for calculating the buffer value can be represented by:
[tex]\mathbf{pH = pKa + log \dfrac{([A^+])}{([HA])}}[/tex]
[tex]\mathbf{pH = 3.454 + log \Big(\dfrac{0.10}{0.15}}\Big)[/tex]
pH = 3.2779
For Buffer 2;
[HF] = 0.090 M [NaF] = 0.060 M[tex]\mathbf{pH = 3.454 + log \Big(\dfrac{0.06}{0.09}}\Big)[/tex]
pH = 3.2779
We can see that the pH of buffer 1 is equivalent to the pH of buffer 2.
Buffer capacity measures a solution's capacity to endure pH fluctuations by either accepting or detaching H+ and OH- ions.
For Buffer 1:
The buffer capacity can be expressed by using the formula:
[tex]\mathbf{\beta = \dfrac{2.3 \ Ka [H^+] [C]}{(Ka+ [HA])^2}}[/tex]
where;
C = total concentration of buffer components i.e. [HA] + [A⁻][tex]\mathbf{\beta = \dfrac{2.3 \ \times 3.5 \times 10^{-4} \times (0.15) (0.15 \times 2)}{(3.5 \times 10^{-4} + (0.15)^2 }}[/tex]
[tex]\mathbf{\beta = \dfrac{3.6225 \times 10^{-5}}{0.02260}}[/tex]
[tex]\mathbf{\beta = 0.0016}[/tex]
For Buffer 2:
[tex]\mathbf{\beta = \dfrac{2.3 \ \times 3.5 \times 10^{-4} \times (0.09) (0.09 \times 2)}{(3.5 \times 10^{-4} + (0.09)^2 }}[/tex]
[tex]\mathbf{\beta = \dfrac{1.3041 \times 10^{-5}}{0.008163}}[/tex]
[tex]\mathbf{\beta = 0.00159}[/tex]
Therefore, we can conclude that the pH values of Buffers #1 and #2 are equal, and the buffering capacity of Buffer #1 is higher than that of Buffer #2.
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Cotton and coir are the types of ___________fibres.
Answer:
naturalExplanation:
hope this helps you!!
mark as brainliest please
Answer:
seed fibers
Explanation:
since they're harvested separately from their seed
Which of the following statements best describes chemical equilibrium?
Answer:
A state in which the concentrations of all the reactants and products remain constant with time
Explanation:
The statement which best describes chemical equilibrium is that the concentrations of all the reactants and products remain constant with time.
What is Equilibrium?This is the situation in an object in which two or more forces or factors counter-influences because of them being constant.
In this scenario, the concentrations of all the reactants and products is constant which depicts the right choice.
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Learning Task 3 Directions: Below are description of tools that need maintenance. Give the immediate maintenance procedure that should be done. Write your answers on a separate sheet of paper.
Preventive Maintenance Task of Tools and Equipment Description
1. a rake with wet wooden handle
2. a filler covered with sticky plant sap
3. clogged air filter of a chain saw
4. uncoiled garden hose
5. a wheelbarrow that won't roll
ANSWER:
1.
2.
3.
4.
5.
What characterizes a homogeneous mixture?
A. The mixture settles out when left standing.
B. The substances are evenly distributed throughout.
O C. The mixture has different consistencies.
D. The substances are identifiable in the mixture.
Answer:
D. The substances are evenly distributed throughout.
how has the model of an atom changed overtime?
Answer:
This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of their experiments were a surprise and they did not fit with the existing model. Scientists changed the model so that it could explain the new evidence.
Explanation:
Question 25 of 30
Which statement best describes what happens when thermal energy of the
air around a fire is transferred to the surrounding air?
O A. The thermal energy is spread out by the surrounding air.
O B. The thermal energy is destroyed as it changes to chemical energy.
C. The thermal energy is destroyed over time.
ОО
D. The thermal energy changes to chemical energy.
SUBMIT
Answer: The thermal energy is spread out by the surrounding air.
Explanation:
got it right on test
Find the sum of coefficients for all reactants and products.
CuBr2 + H3PO4 ⇨ Cu3(PO4)2 + HBr
The sum of coefficients for all reactants and products of given reaction is 12.
[tex]CuBr_{2} + H_{3}PO_{4}[/tex]⇨ [tex]Cu_{3} (PO_{4})_{2} + HBr[/tex]
For finding coefficients each molecules in reactant and product, first we have to balanced the given chemical equation.
What is balanced chemical equation?The chemical equation in which number of atoms for each elements and total charges is same in both side, reactant as well as product in a reaction.
Example: Let the unbalanced chemical equation is,
[tex]CuBr_{2} + H_{3}PO_{4}[/tex]⇨ [tex]Cu_{3} (PO_{4})_{2} + HBr[/tex]
So, the balanced chemical equation become.
[tex]3CuBr_{2} + 2H_{3}PO_{4}[/tex] ⇨ [tex]Cu_{3} (PO_{4})_{2} +6 HBr[/tex]
Reactant Product
The number placed prior to the each molecules is called coefficient of reactant and product.
So, the total coefficient for reactant and product are 3 + 2 + 1 + 6 = 12.
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need answers pls!! Multiple choice
Answer:
BONJOUR.
CHEMICAL CHANGE ARE THOSE THAT FORM A NEW SUBSTANCE
PHYSICAL CHANGE ARE THOSE THAT DOESN'T FORM A NEW SUBSTANCE.
OPTION D IS THE ANSWER
I HOPE IT IS HELPFUL.
MERCI
A comparison of kinetic and potential energy is shown here with the position and motion of a round object with regards to a hill.
Which statements support the claim that an energy transfer is occurring as the ball rolls down the hill? Select ALL that apply.
A) the ball transfers energy to the air in the form of sound
B) the ball generates a gravitational field as it rolls downward
C)the potential energy is converted to kinetic energy as the ball rolls down the hill
D)the kinetic energy is converted to potential energy as the ball rolls down the hill
E) the ball loses kinetic energy but generates thermal energy as it moves down the hill
Answer:
YALL ITS A AND C
Explanation:
The potential energy is converted to kinetic energy as the ball rolls down the hill.
What are potential energy and kinetic energy?
The energy that is conserved or stored in a substance or object is known as potential energy. The position, organization, or state of the object or substance determines the amount of stored energy.
Potential energy mostly comes in two forms: The potential energy of gravity and Potential elastic energy.
The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object to accelerate it. We must put in effort to apply force.
Therefore, The potential energy is converted to kinetic energy as the ball rolls down the hill.
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Classify the molecules based on whether the molecule has a standard enthalpy of formation, AH;, equal to 0. Assume all
conditions are at standard pressure and temperature (STP).
The standard enthalpy of formation of substance in its standard state is zero.
Enthalpy is defined as a thermodynamic quantity that describes the energy of a system. For substances in their standard state, the enthalpy of formation is zero.
The standard state of a substance is defined as the state in which it is found under standard conditions. The following substances has their standard ethalpy of formation as zero or not zero;
Zero enthalpy of formation Non zero enthalpy of formation
Cl2(g) I2(s)
Br(g) Br2(l)
I2(g) Br2(s)
Hg(l) Hg(s)
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If you had excess chlorine, how many moles of aluminum chloride could be produced from 12.0g of aluminum
Answer:
Hence, 0.455 mol of aluminum chloride could be produced from 12.0 grams of aluminum.
Explanation:
Given data:
•Mass of aluminum is 12.0 grams.
To find:
•Number of moles of aluminum chloride produced from Al.
The given reaction is as follows:
2A1+ 3Cl₂ → 2AlCl3
First, we have to find the number of moles of aluminum by the relation given below:
n = m M;
Where:
•n is the number of moles.
•m is the mass in grams.
•M is the molar mass in g/mol.
The molar mass of Al is 26.98 g/mol. Substitute the values in above equation to obtain the number of moles of aluminium as follows:
n = (12.0g)/(26.98g /mol)
= 0.445 mol
From the reaction stoichiometry, we can see that 2 moles of Al forms 2 moles of aluminium chloride (A1C13). This means, the number of moles of Al and AlCl3 is equal.
So, 0.445 mol Al will give 0.455 mol AlC13.
If a steam reforming line processes methane at a temperature of
725.0°C and a pressure of 12.00 atm, what is the volume (in L) that
20.0 moles of methane would occupy in the reactor?
Answer:
ideal gas law. PV=nRT
Explanation:
pressure x volume = #moles x R (constant of 8.31) x temp
Drawing Conclusions Why is it important to have such a detailed report on the economy? How does it help the president and Congress make decisions about taxes and expenditures
A detail report is very important for better decisions of President about economy.
It is very important to have such a detailed report on the economy because it helps the president as well as Congress to make better decisions about the imposing of taxes. It greatly helps and provides all information to the president and Congress so that they make better decisions about taxes and expenditures.
Without this detailed report, the Congress can't take right decisions about taxes and economy of the country so we can conclude that detail report is very important for better decisions of president about economy.
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What makes physical change a physical change and a chemical change a chemical change
Answer:
A physical change is reversible and the changes made are only physical (smell, physical state, volume, etc) and most importantly no new substance is formed. In a chemical change, a new substance is formed, the chemical properties are changed, and it's permanent.
A 17.5 mL portion of a 0.1050 M Na2CO3 solution is added to 46.0 mL of 0.1250 M NaCl. What is the concentration of sodium ion in the final solution?
The sodium ion concentration in the solution of 17.5 mL of 0.1050 M Na₂CO₃ and 46.0 mL of 0.1250 M NaCl is 0.148 M.
To find the Na⁺ concentration in the final solution, we need to find the number of moles of the ion in the Na₂CO₃ and NaCl solutions and the volume of the final solution.
[tex] C_{Na^{+}} = \frac{n_{t}}{V_{t}} [/tex] (1)
Where:
[tex] n_{t} [/tex]: is the total number of moles of Na⁺
[tex] V_{t} [/tex]: is the volume of the final solution
The number of moles of Na⁺ in the Na₂CO₃ solutionThe number of moles of Na₂CO₃ can be calculated as follows:
[tex] n_{Na_{2}CO_{3}} = C_{Na_{2}CO_{3}}*V_{Na_{2}CO_{3}} [/tex]
Where:
[tex] C_{Na_{2}CO_{3}} [/tex]: is the concentration = 0.1050 mol/L
[tex] V_{Na_{2}CO_{3}} [/tex]: is the volume = 17.5 mL = 0.0175 L
[tex] n_{Na_{2}CO_{3}} = 0.1050 mol/L*0.0175 L = 1.84 \cdot 10^{-3} \:moles [/tex]
We can find the number of moles of Na⁺ knowing that in 1 mol of Na₂CO₃ we have 2 moles of Na⁺.
[tex] n_{Na^{+}} = \frac{2 \:mol\: Na^{+}}{1\:mol \:Na_{2}CO_{3}}*mol \:Na_{2}CO_{3} = \frac{2 \:mol\: Na^{+}}{1\:mol \:Na_{2}CO_{3}}*1.84 \cdot 10^{-3} \:moles = 3.68 \cdot 10^{-3} \:moles [/tex]
The number of moles of Na⁺ in the NaCl solutionThe number of moles of Na⁺ in the NaCl solution is:
[tex] n_{NaCl} = C_{NaCl}*V_{NaCl} = 0.1250 mol/L*0.046 L = 5.75 \cdot 10^{-3} \:moles [/tex]
In 1 mol of NaCl we have 1 mol of Na⁺, so the number of moles of Na⁺ in the NaCl solution is 5.75x10⁻³ moles.
Total number of moles of Na⁺The total number of moles of Na⁺ in the final solution can be calculated as follows
[tex] n_{t} = n_{{Na^{+}}_{Na_{2}CO_{3}}} + n_{{Na^{+}}_{NaCl}} = 3.68 \cdot 10^{-3} \:moles + 5.75 \cdot 10^{-3} \:moles = 9.43 \cdot 10^{-3} moles [/tex]
Hence, the number of moles of Na⁺ in the final solution is 9.43x10⁻³ moles.
The volume of the final solutionThe volume of the final solution is given by:
[tex] V_{t} = V_{Na_{2}CO_{3}} + V_{NaCl} = 0.0175 L + 0.046 L = 0.0635 L [/tex]
Concentration of Na⁺ in the final solutionThe concentration of Na⁺ in the final solution is (eq 1):
[tex] C_{Na^{+}} = \frac{n_{t}}{V_{t}} = \frac{9.43 \cdot 10^{-3} moles}{0.0635 L} = 0.148 mol/L [/tex]
Therefore, the concentration of sodium ions in the final solution is 0.148 M.
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0.250 moles of NaCl is dissolved in 0.850 L of solution. What is the molar concentration?
Considering the definition of molarity, the molar concentration is 0.294 [tex]\frac{moles}{liter}[/tex].
Molarity reflects the concentration of a solution indicating the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{amount of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case, you know:
amount of moles of solute= 0.250 molesvolume= 0.850 LReplacing in the definition of molarity:
[tex]molarity=\frac{0.250 moles}{0.850 L}[/tex]
Solving:
molarity= 0.294 [tex]\frac{moles}{liter}[/tex]
Finally, the molar concentration is 0.294 [tex]\frac{moles}{liter}[/tex].
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Who is most likely associated with the quote below?
“Nothing exists except atoms and empty space; everything else is opinion."
А: Democritus
B: Aristotle
C: Thales
D: Epicurus
Answer:
democritus
Explanation:
i looked it up
Formula for gallium peroxide
Answer:
Ga₂O
Explanation:
Zinc chloride can be made from the reaction between zinc oxide and hydrochloric acid. Describe a laboratory method to produce pure dry crystals of zinc chloride. (6 marks)
Suggest an alternative to zinc oxide that could react with hydrochloric acid to give you the desirable product.(1 mark)
Crystallization, followed by filtration to remove excess solution, followed by drying on a watch glass or in a warm oven, can yield pure dry crystals of zinc chloride.
What is crystallization?Crystallization is defined as the formation of a solid in which the atoms or molecules are highly organized into a structure known as a crystal.
It can also be defined as a natural process that occurs when materials solidify from a liquid or precipitate from a liquid or gas.
There are basically three types of crystallization.
Evaporative crystallizationCooling crystallization from solution or the meltReactive crystallization or precipitationFiltration is defined as the process of removing solid particles from a liquid or gaseous fluid by using a filter medium that allows the fluid to pass through but retains the solid particles.
Zinc oxide that could react with hydrochloric acid to give you the desirable product because acid is a neutralizing base, the reaction of hydrochloric acid with zinc oxide to form zinc chloride and water is a neutralization reaction .
Thus, crystallization, followed by filtration to remove excess solution, followed by drying on a watch glass or in a warm oven, can yield pure dry crystals of zinc chloride.
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The volume between the 50.00 mark and the valve of a buret is 5.58 . The buret reading of an upside down buret containing a pocket of hydrogen gas is 31.15 mL. What is the total volume of hydrogen in the buret?
We have that for the Question ,it can be said that The total volume of hydrogen gas is
Vt=24.43ml
From the question we are told
The volume between the 50.00 mark and the valve of a buret is 5.58 . The buret reading of an upside down buret containing a pocket of hydrogen gas is 31.15 mL. What is the total volume of hydrogen in the buret?
Generally
With the buret divided into three
The value section the middle and the top
With hydrogen gas contained in the middle and value area
We have
Volume of middle
Vm=(50-31.15)
Vm=18.85ml
For Valve area
Vv=5.58ml
Therefore
The total volume of hydrogen gas is
Vt=Vm+Vv
Vt=18.85+5.58
Vt=24.43ml
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5. The point at which the relative humidity reaches 100% is the
and (2 points)
the air can hold no more water vapor.
The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve a relative humidity (RH) of 100%. At this point the air cannot hold more water in the gas form.
Answer:
ii cud givee uu an explanation for understandment for help if still don't understand im sowwyy thenn.
Explanation:
relative humidity is related to the partial pressure of water vapor in the air at 100% humidity the partial pressure is equal to the vapor pressure and no more water can enter the vapor phase.
Daje 25pkt bo tylko tyle mam :(( pomoże ktoś?
Answer:
brak syna 25 punto, syn 13
Explanation:
please help!!!!!!!!!
Answer
At the crust
Explanation:
Mantle is far away from it unless its in a ocean.
Answer:
A mountain would form on the continental crust
Explanation:
Typically, a convergent plate boundary—such as the one between the Indian Plate and the Eurasian Plate—forms towering mountain ranges, like the Himalaya, as Earth’s crust is crumpled and pushed upward.
WILL GIVE BRAINLIEST AND 20 POINTS!
Calculate the volume in milliliters of a solution required to provide 2.14 g o sodium chloride from a 0.930 M solution.
Answer:
Step 1 of 3
Here we have to calculate the volume of the solution in mL.
(a) 2.14 g of sodium chloride from a 0.270 M solution
We can calculate the volume of a solution from its molarity. It is known that the molarity of a solution can be calculated as follows,
Molarity = 
Hence volume of solution = 
Here it has been given that,
Mass of NaCl = 2.14 g
Molarity = 0.270 M
Molecular weight of NaCl = 58.44 g/mol
In order to calculate the volume, 1st we have to find out the number of moles,
Number of moles of NaCl = 
=  = 0.03662 mol of NaCl
Now the volume can be calculated as,
volume of solution = 
=  = 0.136 L or 136 mL solution
Hence the volume of NaCl is found to be 136 mL.
which ionic equation represents the reaction taking place at anode during the electrolysis of molten aluminium oxide?
Explanation:
at the Anode, Oxide ions lose electrons and produce Oxygen gas
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Change in oxidation number in zn is
Answer:
Equalize the changes in oxidation number Each Zn atom has lost two electrons, and each H atom has gained one electron. You need 2 atoms of H for every 1 atom of Zn. This gives us total changes of +2 and -2.
Explanation:
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