Can someone help me please
Answer:
(14)The pH is 8.3 and is basic
(15) pOH = 11.0 The solution is acidic
Explanation:
(14) From the question,
pH = -log[H₃O⁺]............... Equation 1
Given: H₃O⁺ = 5.6×10⁻⁹ M
Substitute the value above into equation 1
pH = -log[5.6×10⁻⁹]
pH = 8.3
The pH is 8.25 and is basic.
(15)
pOH = -log[OH⁺]................ Equation 2
Given: [OH⁺] = 8.34×10⁻¹² M
Substitute into equation 2
pOH = -log[8.34×10⁻¹²]
pOH = 11.0 Hence the solution is acidic
On the line provided, write the formula for the compound made by each of the following. (3 pts each) 20. Mgand NO3-1, 21. CIO3-1 and K 22. Ca and So4-2, 23. NH4+1 and SO4-2, 24. C2H30-1, ' and H 25. Hand CO, t
Answer:
20. Mg(NO3)2
21. KClO3
22. CaSO4
23. (NH4)2SO4
24. HC2H3O
25. CO is carbon dioxide, which is neutral and would not combine with a hydrogen ion. Did you mean H and CO3(2-)? That would be H2CO3 (carbonic acid)
Explanation:
You have to match the charges of the Cations and Anions.
Write a balanced half-reaction for the reduction of bismuth oxide ion to bismuth ion in basic aqueous solution. Be sure to add physical state symbols where appropriate.
Answer:
[tex]3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-[/tex]
Explanation:
Hello there!
In this case, according to the required half-reaction, we start by setting it up from bismuth (V) oxide ion to bismuth (III) ion:
[tex]BiO_3^-\rightarrow Bi^{3+}[/tex]
Thus, next realize that the oxidation state of Bi in BiO3^- is 5+ because oxygen is 2- (-2*3+x=-1;x=-1+6;x=+5), so we obtain:
[tex](Bi^{5+}O_3)^-\rightarrow Bi^{3+}[/tex]
Thereafter, we realize three water molecules are needed on the right in order to balance the oxygens and consequently 6 hydrogen atoms on the left to balance hydrogen:
[tex]6H^++(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O[/tex]
Now, since the balance is is basic media, we add six molecules of hydroxide ions in order to produce water with the hydrogen ones:
[tex]6OH^-+6H^++(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O+6OH^-\\\\6H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O+6OH^-\\\\6H_2O-3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-[/tex]
Then, we accommodate the waters to obtain:
[tex]3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-[/tex]
Best regards!
What is the mass of an object with a volume of 2.0 mL and a density of 28.8 g/mL?
Answer:
your answer is really 308ml
Taking into account the definition of density, the mass of an object with a volume of 2.0 mL and a density of 28.8 [tex]\frac{g}{mL}[/tex] is 57.6 grams.
But first you must know the definition of density. Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
In this case, you know that:
Density= 28.8 g/mLVolume= 2 mLReplacing in the definition of density:
[tex]28.8 \frac{g}{mL} =\frac{mass}{2 mL}[/tex]
Solving:
mass= 28.8 [tex]\frac{g}{mL}[/tex] ×2 mL
mass= 57.6 g
In summary, the mass of an object with a volume of 2.0 mL and a density of 28.8 [tex]\frac{g}{mL}[/tex] is 57.6 grams.
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https://brainly.com/question/952755?referrer=searchResultshttps://brainly.com/question/1462554?referrer=searchResultsAn acid of known strength, HA, is used in a titration to determine the concentration of a solution of NaOH. What ions are present in the flask at the equivalence point?
Answer:
Na+ And A-
Explanation:
Answer: Na + and A-
Explanation:
How are ionic compounds named?
Answer:
Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions.
Explanation:
For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.
Lily is doing a science experiment with a substance in a sealed jar. At first,
the substance's molecules are moving around each other. What will
happen to Lily's substance if she transfers energy into the substance and
causes a phase change? After the phase change, the substance's
molecules will move...'
faster, and the substance will be a liquid.
faster, and the substance will be a gas.
slower, and the substance will be a solid.
slower, and the substance will be a liquid.
Answer:
Faster, and the substance will be a gas.
Explanation:
I'm quite not sure with it. But, I've tried my best. Since maybe the substance is liquid
What does evaporation produce?
a precipitation
brain or snow
С
water vapor
d condensation
Answer:
C. Water Vapor
Explanation:
Hope this helps! Have an Amazing day!!
Answer: Hewo, there! your answer is Below
c. water vapor Is the correct answer.
Explanation:
The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor.
Hope this helps you!
Have a great day!!
-August-
Which of the following is not the name of an amino acid?
A. Lysine
B. Valine
C. Methane
D. Phenylalanine
(Edge)
Answer:
C. Methane
Explanation:
Hopefully this isnt too late!
Answer:
C. Methane
(Photo for proof at the bottom.)
Explanation:
All amino acids contain an amino group, a carboxyl group, and an R group. An amino group consists of NH2. A carboxyl group consists of COOH. And an R group usually consists of a hydrogen or carbon atom bonded to the amino acid. Methane only consists of CH4, which clearly does not meet the criteria of an amino acid.
Here's a photo of Edge incase you're doubtful.
Please click the heart if this helped.
I REALLY NEED HELP ITS DUE TODAY TY IN ADVANCE <3
Which bent shape has more repulsion and a smaller bond angle?
bent 6A
bent 5A
Ultrasound waves do not transmit easily through bone. State what you think happens to ultrasound waves when they reach a bone in the body. Give evidence to support your claim and explain your answer.
Answer:
See explanation
Explanation:
Echo is the reflection of sound waves. Recall that ultrasound are also sound waves of high frequency.
When ultra sound meets an obstacle such as a bone, it is reflected backwards and gives rise to an echo back in the transducer.
Since ultrasound is high frequency sound wave wave; It does not passes through bone due to the high density of the bone, the data required may now be collected.
Complete the following double displacement reactions
KOH + H 2 SO 4
NaOH + HCl
Al 2 (SO 4 ) 3 + NaOH
BaCl 2 + Na 2 SO 4
PbSO 4 + Na 2 CO 3
Answer:
2 KOH + H₂SO₄ ⇒ K₂SO₄ + 2 H₂O
NaOH + HCl ⇒ NaCl + H₂O
Al₂(SO₄)₃ + 6 NaOH ⇒ 3 Na₂SO₄ + 2 Al(OH)₃
BaCl₂ + Na₂SO₄ ⇒ BaSO₄ + 2 NaCl
PbSO₄ + Na₂CO₃ ⇒ PbCO₃ + Na₂SO₄
Explanation:
In double displacement reactions, both reactants exchange their cations and anions.
2 KOH + H₂SO₄ ⇒ K₂SO₄ + 2 H₂O
NaOH + HCl ⇒ NaCl + H₂O
Al₂(SO₄)₃ + 6 NaOH ⇒ 3 Na₂SO₄ + 2 Al(OH)₃
BaCl₂ + Na₂SO₄ ⇒ BaSO₄ + 2 NaCl
PbSO₄ + Na₂CO₃ ⇒ PbCO₃ + Na₂SO₄
Did you hear the one about a chemist who was reading a book about helium?
Answer: I had that before it's a riddle. Here lemme find it and give you the answer.
Explanation:
1.H
2.E
3.C
4.O
5.U
6.L
7.D
8.U
9.T
10.P
11. N
12.T
13.I
14.T
15.D
16.O
17.N
18.W
Helium is a type of chemical element which is a noble gas that does not have odor, color, taste and does not contain toxicity. It's atomic number is 2 and is chemically represented with "He"
As a result of this, there are some unique characteristics of the Helium element which includes:
Low boiling pointLow densityHigh thermal conductivityLow solubility, etcPlease note that your question is disjointed so I gave you a general overview to help you understand the concept
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"The sun was setting behind the mountain when Isaiah reached the first fields of crops, bordered by low white stone walls. At the end of the road was the village, built on a slope, whose houses sank with all their weight into the ground, as if in fear of sliding further down. Roofs of overlapping slates peered down on the tiny, lifeless windows. The tall wooden chimneys, shaped like truncated pyramids, smoked quietly in the evening. This place was the extreme point where men had dared to plant a shelter and sow the grain. But, on the rough, rocky soil, even the rye did not grow well. The old men died without having saved anything, and the young, one after the other, fled from this corner of bad earth that the snowfalls isolated from the world for six months of the year. Once prosperous and populated to the rim, the village now had barely eighteen fires. And above it there were only shelters lost in the mountains for summer climbers. "
1.This description allows us to identify the village of the two brothers as being mainly
a. An isolated high mountain village in which the inhabitants work hard and see their efforts rewarded.
b. A quiet high-altitude village in which many courageous young farmers live.
c. A village in total harmony with the wilderness that still can't feed its children.
d. A pleasant village in the heart of the rugged mountains that welcomes many climbers in summer.
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This is bob. If you brainliest him. He will reward you with a certain script.
rock cycle define
in your own words
Answer:
Explanation:
The rock cycle basically tell you how the different types of rocks are related to each other and tells how they change over time.
Hope this helped!!!
Answer:
The rock cycle is the process by which rocks of one kind change into rocks of another kind. Metamorphic rock is igneous or sedimentary rock that has been heated and squeezed. It can erode into sediment or melt into a hot substance known as refordium. It is formed under extreme pressure and temperature deep inside mountain chains. For example, sedimentary rock shale becomes slate when heat and pressure are added, thus transforming it into another state of rudementury.
The isomerization reaction, ch3nc → ch3cn, is first order and the rate constant is equal to 0.46 s-1 at 600 k. what is the concentration of ch3nc after 7.0 seconds if the initial concentration is 0.30 m?
Answer:
y=meme3squared
Explanation:
YEEEEEEEEEEEEEEEE
The pressure of an ideal gas stays constant at 2.57 atm.
This ideal gas has a volume of 45.8 mL when it is at a
temperature of 37.0°C. What temperature will this ideal gas
be at when it contracts to 32.5 mL?
Answer:
[tex]T_2=-53.15\°C[/tex]
Explanation:
Hello there!
In this case, in agreement to the Charles' law which states that the volume and temperature relate to each other via a directly proportional relationship at constant pressure, we can write:
[tex]\frac{T_2}{V_2} =\frac{T_1}{V_1}[/tex]
Thus, given V1, V2 and T1 (310 in Kelvin), we can solve for the final temperature as shown below:
[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{310K*32.5mL}{45.8mL}\\\\T_2=220 K-273.15K\\\\T_2=-53.15\°C[/tex]
Best regards!
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result?
Answer:
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result? The first atom emits light with more energy.
What does a positive AH look like on a potential energy diagram?
A. The activation energy of the reactants is less than the activation
energy of the products.
B. The potential energy of the products is equal to the potential
energy of the reactants.
C. The potential energy of the products is greater than the potential
energy of the reactants.
D. The potential energy of the reactants is greater than the potential
energy of the products.
Answer: In an endothermic reaction for whom the value of [tex]\Delta H[/tex] is positive has potential energy of the products greater than the potential energy of the reactants.
Explanation:
A chemical reaction in which heat energy is absorbed is called an endothermic reaction. For an endothermic reaction the value of [tex]\Delta H[/tex] is positive.
A chemical reaction in which heat energy is released is called an exothermic reaction. For an exothermic reaction the value of [tex]\Delta H[/tex] is negative.
In an endothermic reaction, heat energy is absorbed by the reactant molecules due to which the energy of products tend to increase. As potential energy is the energy acquired by a substance due to its position.
Therefore, we can conclude that in an endothermic reaction for whom the value of [tex]\Delta H[/tex] is positive has potential energy of the products greater than the potential energy of the reactants.
Answer:
C The potential energy of the products is greater than the potential
energy of the reactants.
Explanation:
Apx
Which of the following equations correctly describes how to calculate net income? a. net income = (cost of goods sold) - (net sales) - (operating expenses) b. net income = (operating expenses) - (cost of goods sold) - (net sales) c. net income = (operating expenses) + (cost of goods sold) - (net sales) d. net income = (net sales) - (cost of goods sold) - (operating expenses) Please select the best answer from the choices provided A B C D Mark this and return
Answer:
The answer is D. net income= (net sales) - (cost of goods sold)- (operating expenses).
Explanation:
can someone help me with 5?
Answer:28 g
Explanation:
The product of the molarities of the dissolved ions, raised to a power equal to the ion's coefficient in the balanced chemical equation. Choose... The mass of a salt in grams that will dissolve in 100 mL of water. Choose... A solution that has dissolved the maximum amount of a compound at a given temperature. Any further addition of salt will remain undissolved. Choose... A decrease in the solubility of an ionic compound as a result of the addition of a common ion. Choose... The maximum number of moles of a salt that will dissolve in 1 L of solution. Choose...
Answer:
Solubility product constant
Solubility
Saturated Solution
Common ion effect
Molar Solubility
Explanation:
If i have the ionic compound KNO3 for instance; the solubility product of the compound is the product of the molarities of the dissolved ions, raised to a power equal to the ion's coefficient in the balanced chemical equation.
E.g
KNO3(s) ------> K^+(aq) + NO3^-(aq)
Ksp = [K^+] [NO3^-]
The solubility of any given substance is defined as mass of the substance in grams that dissolves in 100 mL of water.
A saturated solution is one that has dissolved the maximum amount of solute at a given temperature. If more solute is added, it will not dissolve.
If i add AgCl to a solution of HCl, the solubility of AgCl in HCl solution is found to be less than its solubility in pure water because of the presence of a common Cl^-. Hence, common ion effect is a decrease in the solubility of an ionic compound as a result of the addition of a common ion to the solution.
The molar solubility of a substance is defined as the maximum number of moles of a substance that will dissolve in 1 L of solution.
The terms used to describe the followings are:
Solubility product constantSolubilitySaturated SolutionCommon ion effectMolar SolubilityWhat is molarity?
The molarity is the concentration unit used for the determination of the moles of solute in the liter of solution.
The product of the concentration of the ions raised to the stoichiometric coefficient gives the solubility product constant for the compound.For example:
[tex]\rm H_2A\;\rightarrow\;2H^+\;+A^-\\Solubility\;product\;constant=[H^+]^2[A^-][/tex]
The solubility can be defined as the mass of the salt that can be dissolved in 100 mL of water.The solution with the maximum amount of salt dissolved at a certain temperature is termed the saturated solution. Further addition of the solute results in the precipitation of the solute in the solution.
The addition of the compounds with the common ion as the salt results in an increased concentration of the salts in the solution and the solubility will be decreased.The effect raised with the addition of the common ions is termed the common ion effect.
The molar solubility is the maximum moles of the salt that can be dissolved in the liter of the solution.Learn more about molarity, here:
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How many moles of O2 are needed to react with 2.55 mol of C2H2?
Express your answer to three significant figures
Answer: 6.38 moles of [tex]O_2[/tex] are needed to react with 2.55 mol of [tex]C_2H_2[/tex]
Explanation:
The balanced chemical reaction for the combustion of ethyne is:
[tex]2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O[/tex]
According to stoichiometry:
2 moles of [tex]C_2H_2[/tex] require = 5 moles of [tex]O_2[/tex]
Thus 2.55 mol of [tex]C_2H_2[/tex] require = [tex]\frac{5}{2}\times 2.55=6.38[/tex] moles of [tex]O_2[/tex]
Thus 6.38 moles of [tex]O_2[/tex] are needed to react with 2.55 mol of [tex]C_2H_2[/tex]
d. Explain why hydrogen produces three light in spectrometer
Answer:
Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released. Hence, mono-electronic hydrogen has many spectral lines.
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What must take place for an ionically bonded substance to melt?
Answer:
Heat reaction
Explanation:
Heat must be applied in order to melt a substance.
Which of the following compound is most soluble in water a)glycerol b) ethyl alcohol c) ethylene glycol d)ethyl chloride
Answer:
glycerol
Explanation:
it is thick sweet liquid.It is type of alcohol which has 3 OH groups
Which of the following molecules have a dipole moment?
Select one or more:
CS2
SeS2
CINO
ВСІЗ
CClaF2
CO2
PCIE
Com
Answer:
cs2
Explanation:
what two factors does thermal energy depend upon
Answer:
Thermal energy depends on mass and temperature.
Explanation:
The two factors on which thermal energy depends are the mass of an object and temperature.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.There are the three types of thermal energy.
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The relation between molarity and normality is expresses as: a) M = N x g.e.w/g.m.w
b) M = N x g.m.w/ g.e.w
c) M = N x no. of equiv./mole
d) M = N x no. of g.m.w/mole
Answer: [tex]Molarity=Normality\times \frac{gew}{gmw}[/tex]
Explanation:
Molarity is defined as the number of moles dissolved per liter of the solution.
[tex]Molarity=\frac{\text {moles of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {moles of solute}=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
Normality is defined as the number of gram equivalents dissolved per liter of the solution.
[tex]Normality=\frac{\text {gram equivalents of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {gram equivalents of solute}}=\frac{\text {given mass}}{\text {Equivalent mass}}[/tex]
Thus [tex]Molarity=Normality\times \frac{\text {Equivalent mass}}{\text {Molar mass}}[/tex]
