Answer:
pH = 5.19, at the equivalence point
Explanation:
This is titration of a weak base and a strong acid. pH in the equivalence point will be acid. To determine this pH, we know that in in the equivalence point:
mmoles base = mmoles of base
50 mL . 0.3M = 0.150 M . Volume of acid
Volume of acid = (50 . 0.3)/ 0.15 → 100 mL
Total volume of equivalence point is 50 mL + 150 mL = 200 mL
Neutralization reaction is:
NH₃ + HCl → NH₄Cl
NH₃ + H₃O⁺ ⇄ NH₄⁺ + H₂O
15 15
0 0 15
Ammonia's Kb = 1.8×10⁻⁵
In the equivalence point, we have only ammonium, beacuse all the amonia reacted to the protons. Let's make the equilibrium
NH₄⁺ + H₂O ⇄ NH₃ + H₃O⁺ Ka
I: 15 - - -
Eq: 15-x x x
Ka = 1×10⁻¹⁴ / Kb → 5.55×10⁻¹⁰
[NH₄⁺] = 15 mmoles / 200 mL = 0.075 M
In the equilibrium, we can avoid the 15 - x, because Ka is soo small.
Expression for Ka is [ NH₃ ] . [H₃O⁺] / [NH₄⁺] = 5.55×10⁻¹⁰
[H₃O⁺] = √(5.55×10⁻¹⁰ . 0.075)
[H₃O⁺] = 6.45×10⁻⁶
- log [H₃O⁺] = pH → 5.19
Construct the inequality for the following cases.
Bina ketaksamaan bagi kes-kes berikut.
1.
The sum of x and y are less than 50.
Answer:
x + y < 50
Explanation:
Identify the statements that correctly describe the saturation temperature of a solution. Select one or more:_________ a. Any temperature at which the solution is liquid The temperature at which b. the Ksp value can be calculated c. The temperature at which solid begins to appear from a cooled solution d. Any temperature at which all of the compounds is solid
Answer:
The correct options are "b" and "c". A further explanation is given below.
Explanation:
Saturation temperature can be determined where this enough of some other solution that is incorporated like that can be absorbed by a solvent. The formulation is saturated at this same stage, so Ksp could be computed. As well as the solid throughout solution should continue to appear upon freezing below a certain temperature.The other options offered aren't relevant to the situation described. So the equivalents above are the right ones.
The statements that are correctly explained the saturation temperature of a solution is the ksp value should be determined and the temperature where the solid started to appear from the cooling solution.
What is the Saturation temperature?It could be measured when there should be sufficient of some other solution that should be incorporated and the same should be absorbed by the solvent. The formulation should be saturated at a similar stage due to this the ksp should be determined. Also, the solid via the solution should continue to appear that based on the freezing below the specific temperature.
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Sugar solution and steel are both mixtures. Which statement correctly compares them?
A) Both sugar solution and steel are separable mixtures.
B) Both sugar solution and steel are inseparable mixtures.
C) Sugar solution is a separable mixture but steel is an inseparable mixture.
D) Sugar solution is an inseparable mixture but steel is a separable mixture.
Answer:
C) Sugar solution is a separable mixture but steel is an inseparable mixture.
Explanation:
Sugar can be put in water then have the water dried out and there will be sugar. Metal how ever can not be a separable mixture without making it into a liquid.
There is a golden role of solubility, polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, the correct option is option C.
What is solution?Solutions are a homogeneous mixture of two or more substances. A solution is a homogeneous mixture of solvent and solute molecules.
Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution. Sugar solution is a separable mixture but steel is an inseparable mixture. Sugar can be separated by heating the solution . Water will evaporate and sugar will be left. Steel can not be separated by any means.
Therefore, the correct option is option C that is Sugar solution is a separable mixture but steel is an inseparable mixture.
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help plz now asap this is timed
Which type of rock is most likely to form because of high heat and pressure?
igneous
magma
sediment
O metamorphic
Answer:
metamorphic
Explanation:
igneous is when the magma is cooling down, sedimentary is when the are formed by cementing underground. that is why the answer is metamophic
The rock that is most likely to form because of high heat and pressure is known as metamorphic rock. Thus, the correct option for this question is D.
What is the Rock cycle?The rock cycle may be defined as a type of cycle that involves the continuous process through which rocks are constructed, altered from one form to another, destroyed, and then formed again by the action of numerous external factors.
If a rock is exposed to great heat and extreme pressure, it undergoes metamorphism. Due to this, the rock does not melt all the way but it changes to a metamorphic rock that may significantly possess new mineral composition and texture.
Metamorphic rocks are rocks that have been altered from their original structure and properties to another due to immense heat and pressure effects.
Therefore, the rock that is most likely to form because of high heat and pressure is known as metamorphic rock. Thus, the correct option for this question is D.
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Is speed almost never constant
depends on the situation, but scientifically, Einstein's theory of special relativity sets the speed of light, 186,000 miles per second (300 million meters per second). But some scientists are exploring the possibility that this cosmic speed limit changes. The speed of light is constant, or so textbooks say. (google)
1. For a mixture of pure hexane and pure dimethylformamide, the dimethylformamide layer will be found as:______.a. the top layer.b. the bottom layer.c. neither; the two solvents are miscible.d. cannot determine.2. To extract aniline (CeH5NH2) from a solution of chloroform, one would use:_____.a. aqueous HCI.b. aqueous NaOH.c. aqueous NaHCO3.d. either b or c would work.3. For mixture of methylene chloride and diethyl ether, the diethyl ether layer will be found as:____.a. the top layer.b. the bottom layer.c. neither; the two solvents are miscible.d. cannot determine.4. To extract benzyl alcohol (CeH5CH2OH) from a solution of chloroform, one would use:_____.a. aqueous HC b. aqueous NaOH.c. aqueous NH3.d. either B or C would work.5. A large partition coefficient for the extraction of naphthalene into diethyl ether from water means that naphthalene will be found:______.a. only in the water layer.b. only in the diethyl ether layer.c. mostly in the water layer.d. mostly in the diethyl ether layer.
Answer:
1. the bottom layer
2. aqueous HCI
3. the top layer
4.aqueous NaOH
5. mostly in the diethyl ether layer
Explanation:
Pure dimethylformamide is considerably more polar than hexane hence thee two solutions will form two phases with the pure dimethylformamide as the bottom layer.
If we want to extract aniline from chloroform, HCl must be added in order to give a salt that can be extracted into the aqueous layer.
For a mixture of methylene chloride and diethyl ether, the diethyl ether layer will be found as the top layer since it is considerably less polar than methylene chloride.
Benzyl alcohol can be extracted from a solution of chloroform by adding NaOH and extracting it into an aqueous layer.
A large partition coefficient for the extraction of naphthalene into diethyl ether from water means that naphthalene will be found mostly in the diethyl ether layer.
Identify the change in state that does not have an increase in entropy. a. Water evaporating b. Dry ice subliming c. Water boiling d. Ice melting e. Water freezing
Answer:
E. Water Freezing
Explanation:
Entropy refers to the degree of disorderliness of a system.
A. Water Evaporating: There is an increase in entropy, this is because the phase change is from liquid to gas. Gas particles are more disordered than liquid.
B. Dry Ice sublimating: Sublimating refers to a phase change from solid to gas. This is an increase in entropy, this is because the gas particles are more disordered than solid particles
C. Water Boiling: The phase change is from liquid to gaseous state. There is an increase in entropy. Gas particles are more disordered than liquid.
D. Ice melting: The phase change is from solid to liquid state. There is an increase in entropy. Liquid particles are more disordered than that of solid.
E. Water Freezing: The phase change is from liquid to solid state. There is a decrease in entropy. solid particles are less disordered than those of liquid.
The circles, or orbits, for electrons are called energy levels. Each level can hold only a certain number of electrons. Add electrons to each level until you can add any more. How many electrons can each level hold?
IF YOU GIVE ME THE RIGHT ANSWER I WILL GIVE YOU BRAINIEST OR WHATEVER ITS CALLED!!!!!!!
Btw this subject is Science but I couldn’t find it so I just put chemistry.
Answer: n = 1 can hold a maximum of 2 electrons
n = 2 , maximum 8 electrons
n = 3, maximum 18 electrons
As per the principles of quantum mechanics, the number of electrons that can be added to a given energy level is deduced based on the three quantum numbers: n, l , m(l) and m(s)
'n' is the principal quantum number which defines the energy level. It can take on integer values: 0,1,2,3...
'l' is the angular momentum quantum number which defines the shape of the orbital that an electron occupies
l = 0,1,2...(n-1)
where: l = 0 corresponds to s-orbital
l = 1 corresponds to p-orbital
l = 2, corresponds to d-orbital
'm(l)' is the magnetic moment quantum number which defines the orientation of an orbital in space.
m(l) = -l, 0, +l
'm(s)' is the spin quantum number which defines the orientation of an electron is an orbital m(s) = +1/2 or -1/2
An s, p or d-orbital can accommodate a maximum of 2, 6 and 10 electrons respectively For energy level with n= 1
l = 0, i.e. s-orbital or 1s.
Therefore, the maximum number of electrons for a 1s orbital would be 2 resulting in an electron configuration of 1s²
For energy level with n= 2
l = 0, 1 i.e. s and p-orbitals
The maximum number of electrons would be
Electron configuration: 2s²2p⁶
For energy level with n= 3
l = 0, 1, 2 i.e. s, p and d-orbitals
The maximum number of electrons would be
Electron configuration: 3s²3p⁶3d¹⁰
Explain how this change will impact the transfer of thermal energy in the solar cooker design and describe one possible design improvement the students can make to compensate for this change
Answer:it conduct thermal conductivity because of the heat it holds
Explanation:
When energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.
Transfer of thermal energyWe know from the principle of transfer of energy that energy can neither be created nor destroyed but is transformed from one form to another. The image is not shown here but I will try to explain what energy transfer is.
Usually, when energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.
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What is the molarity of chloride ion in a solution made by dissolving 1.300g of aluminumchloride in a total volume of 500.0mL?
Answer:
0.0582 M
Explanation:
The following data were obtained from the question:
Mass of AlCl3 = 1.3 g
Volume of water = 500 mL
Molarity of chloride ion (Cl¯) =?
Next, we shall determine the number of mole in 1.3 g of AlCl3. This can be obtained as follow:
Mass of AlCl3 = 1.3 g
Molar mass of AlCl3 = 27 + (35.5×3)
= 27 + 106.5
= 133.5 g/mol
Mole of AlCl3 =?
Mole = mass /molar mass
Mole of AlCl3 = 1.3/133.5
Mole of AlCl3 = 0.0097 mole
Next, we shall convert 500 mL to litres (L). This can be obtained as follow:
1000 mL = 1 L
Therefore,
500 mL = 500 mL × 1 L / 1000 mL
500 mL = 0.5 L
Thus, 500 mL is equivalent to 0.5 L.
Next, we shall determine the molarity of the AlCl3 solution. This can be obtained as follow:
Mole of AlCl3 = 0.0097 mole
Volume of water = 0.5 L
Molarity of AlCl3 =?
Molarity = mole /Volume
Molarity of AlCl3 = 0.0097 / 0.5
Molarity of AlCl3 = 0.0194 M
Next, we shall write the dissociation equation of AlCl3 in solution. This is illustrated below:
AlCl3 (aq) —> Al³⁺ (aq) + 3Cl¯ (aq)
From the balanced equation above,
1 mole of AlCl3 produced 3 moles of Cl¯.
Finally, we shall determine the molarity of the chloride ion Cl¯ in the solution as follow:
From the balanced equation above,
1 mole of AlCl3 produced 3 moles of Cl¯.
Therefore, 0.0194 M AlCl3 will produce = 0.0194 × 3 = 0.0582 M Cl¯.
Thus, the molarity of the chloride ion, Cl¯ in the solution is 0.0582 M.
If an atom has 3 lone pairs of electrons, how many total electrons are
there?
Answer:
15
Explanation:
im right
help please! worth 100 points!
Answer:
THIS IS ONLY WORTH 50 POINTS LIAR LOL
Explanation:
BUT ILL DO IT ANYWAY GIVE ME A SEC
Answer:
Read below
Explanation:
Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. (A cation is a positively charged ion; an anion is a negatively charged ion.) Covalent or molecular compounds form when elements share electrons in a covalent bond to form molecules.
PES uses which type of electromagnetic radiation?
A. Ultraviolet and X-rays
B. Infrared
C. Ultraviolet and visible
D. Radio
Answer:
the answer should be A if im correct
Explanation:
How many atoms does h20 have and how many elements does h20 have?
Answer:
h20 has 3 atoms
Explanation:
2 hydrogen atoms and 1 oxygen atom
What should you do if your hypothesis is incorrect ?
Answer:
come to a conclusion
Explanation:
The pH of a saturated solution of a metal hydroxide MOH is 10.15. Calculate the Ksp for this compound.
Answer:
[tex]Ksp=2.00x10^{-8}[/tex]
Explanation:
Hello!
In this case, since the pH of the given metal is 10.15, we can compute the pOH as shown below:
[tex]pOH=14-pH=14-10.15=3.85[/tex]
Now, we compute the concentration of hydroxyl ions in solution:
[tex][OH^-]=10^{-pOH}=10^{-3.95}=1.41x10^{-4}M[/tex]
Now, since this hydroxide has the form MOH, we infer the concentration of OH- equals the concentration of M^+ at equilibrium, assuming the following ionization reaction:
[tex]MOH(s)\rightarrow M^+(aq)+OH^-(aq)[/tex]
Whose equilibrium expression is:
[tex]Ksp=[M^+][OH^-][/tex]
Therefore, the Ksp for the saturated solution turns out:
[tex]Ksp=1.41x10^{-4}*1.41x10^{-4}\\\\Ksp=2.00x10^{-8}[/tex]
Best regards!
2 which amoung
the following measurements
the highest number of significant
containsFiqures
a) 1.23x10^-3 kg b) 1.2x10^-3 kg c)0.123×10^3kg
d) 2x 10^5 kg
Weathering affect rock formations by .......
HELP MEEE
What elements would likely form an ionic bond?
a. C & O
b. Mg & Cl
c. Mg & Ca
d. Cl & Ar
When electrons are ______________ from one atom to another, we say the bond is ionic.
a. transferred
b. shared
How many electrons does 47Ag+1 have?
107
47
48
46
Answer:
b. Mg & Cl
a. transferred
46
Explanation:
Ionic bonds form between metals and non-metals when electrons are transferred from one specie to another.
The electrostatic attraction from the resulting ions forms the ionic bonds. A metal is electropositive and will readily donate electronsA non-metal is electronegative and will accept electrons. This creates two oppositely charge ions that attracts by means of ionic bonding.Since Mg and Cl are the only metal - non-metal pair, and ionic bond will form between them.
2.
In the specie;
₄₇Ag¹⁺
47 is the atomic number of the element Ag.
The atomic number is the number of protons in an atom. For a specie in neutral state, the number of protons and electrons are the same.
When an atom loses electron, it becomes positively charged. Here Ag has lost one electron and then, the number of electrons becomes 46. The number of protons is still 47A student is asked to build a model of an atom with 6 protons and 6 electrons. The student is then asked to make an identical model of the same atom but make it an ion. To be successful in this project, the student will:
A.Put six protons in the center of the model, and six electrons around the outside, then add one electron or take away one electron to make an ion.
b.Place electrons and protons in the center of the atom and create an ion by adding one more proton and one more electron to the center of the atom.
c.Put the electrons in the middle of the model and distribute the electrons around the protons. The ion will have seven protons.
d.Put six protons in the center of the atom and distribute the electrons around the protons. The ion will look the same but have seven or five electrons.
Answer:
A. Put six protons in the center of the model, and six electrons around the outside, then add one electron or take away one electron to make an ion.
Explanation:
To make an ion from a given atom, either one electron is added to it or taken away from it.
Protons are the positively charged particles in an atomNeutrons do not carry any chargesElectrons are the negatively charged particlesIn an atomic space, protons and neutrons occupy the center of the atom called nucleus.
Electrons moves round the extranuclear space.
Put the six protons in the center of the model The put the six electrons in the outer space. Then add or take away one or more electrons.This gives an ion.
Is weathering a constructive or deconstructive process?
5ml of mixture of CH4 and C2H4 need 13.2 ml of oxygen for complete combustion.calculate the volume of each gas in the mixture based on the law of gaseous volume.
Answer:
Explanation:
CH₄ + 2O₂ = CO₂ + 2H₂O
C₂H₄ + 3O₂ = 2CO₂ + 2H₂O
Let volume of CH₄ be V , so volume of C₂H₄ will be 5 - V
CH₄ + 2O₂ = CO₂ + 2H₂O
1 vol 2 vol
V 2 V
V vol of CH₄ will require 2 V of O₂
C₂H₄ + 3O₂ = 2CO₂ + 2H₂O
5 - V 3( 5 - V )
5 - V vol of C₂H₄ will require 3 ( 5 - V ) vol of oxygen .
Total oxygen required = 2 V + 3 ( 5 - V )
2 V + 3 ( 5 - V ) = 13.2
2 V + 15 - 3V = 13.2
V = 1.8 ml
vol of CH₄ = 1.8
vol of C₂H₄ = 5 - 1.8 = 3.2 ml.
Please help me my teacher is screaming at me rn :(
are suppose to make ur own problem if so
I would do for time 2 distance would be 4 and keep adding on 2 example
time: 2
distance:4
time: 4
distance: 8
5Fe2 2Mn2 8H2O2MnO4- 5Fe 16H In the above reaction, the oxidation state of iron changes from to . How many electrons are transferred in the reaction?
Answer:
The oxidation number of iron changes from 2+ to 0.
10 electrons are transferred in the reaction.
Explanation:
Step 1: Write the balanced redox reaction
5 Fe²⁺ + 2 Mn²⁺ + 8 H₂O ⇒ 2 MnO₄⁻ + 5 Fe + 16 H⁺
Step 2: identify both half-reactions
Reduction: 5 Fe²⁺ + 10 e⁻ ⇒ 5 Fe
Oxidation: 2 Mn²⁺ + 8 H₂O ⇒ 2 MnO₄⁻ + 16 H⁺ + 10 e⁻
Step 3: Identify the oxidation state change of iron
Iron changes from Fe²⁺ to Fe, that is, the oxidation number changes from 2+ to 0.
Step 4: Determine how many electrons are transferred in the reaction?
According to both balanced half-reactions, 10 electrons are transferred in the reaction.
Silver is an element that can conduct electricity and heat and is shiny. Silver is most
likely
Answer:
a metal
Explanation:
metals are good conductors of electricity
Silver shows electrical and thermal conductivity and shows luster. These properties are feature of a metal and thus silver is most likely a metal.
What is silver?Silver is 69th element in the periodic table and is included in the transition metals. It is a d-block element with the symbol Ag came from the Latin name argentum.
Silver is a common component in electronic devices since it is the most conducting metal . Thermal conductivity and shining property are other features of silver. Due to its shining silver is used to make ornaments.
The highly conducting and shining materials are termed as metals therefore, silver is a metal.
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how does skeletal and circulatory system work together
Answer:Your circulatory system delivers oxygen-rich blood to your bones. Meanwhile, your bones are busy making new blood cells. Working together, these systems maintain internal stability and balance, otherwise known as homeostasis
Explanation:
I would like some help with this asap
Answer:
sorry i coudnt help
Explanation:
In a neutral atom, the number of protons is always equal to what other part of the atom?
a.The sum of electrons and neutrons
b.The number of electrons
c.The number of neutrons
d.The number of neutrons
Answer:
b. The number of electrons
Explanation:
A "neutral atom" has a neutral charge. This means that its charge is equal to zero. In order for the charges to cancel out each other, the atom's positive charge should be equal to the negative charge. These being said, the number of electrons (negatively-charged) is then equal to the number of protons (positively-charged). Those atoms which are not neutral are called "ions." This means that they either have more or less electrons than the protons.
If 8.50 L of natural gas, which is essentially methane (CH4), undergoes complete combustion at 730 mm Hg and 20 degrees C, how many grams of each product are formed?
Grams of CO2=______
Grams of H2O=______
mass CO₂ : 14.96 g
mass H₂O : 12.24 g
Further explanationReaction
CH₄+2O₂⇒CO₂+2H₂O
mol CH₄V=8.5 L
P=730 mmHg=0,961 atm
T=20+273=293 K
[tex]\tt n=\dfrac{PV}{RT}=\dfrac{0.961\times 8.5}{0.082\times 293}=0.34[/tex]
mass CO₂(MW=44 g/mol)mol CO₂= mol CH₄ = 0.34
[tex]\tt 0.34\times 44=14.96~g[/tex]
mass H₂O (MW=18 g/mol)mol H₂O= 2 x mol CH₄ = 2 x 0.34 = 0.68
[tex]\tt 0.68\times 18=12.24~g[/tex]
