Answer:
See Explanation
Explanation:
Let us consider the ionization of these compounds;
H3PO4 ⇔3H^+ + PO4^3-
H3BO3 ⇔3H^+ + BO3^3-
The next to consider is the type of electrolyte the both solution are; the both solutions are weak electrolytes and weak electrolytes do not ionize to a large extent.
The implication of this is that, not so much number of ions is added to the solution due to the poor ionization of these weak electrolytes. Hence, in spite of the subscript of 3, the conductivity of the solution does not significantly improve for the reason stated here quite unlike when strong electrolytes are used.
Iodine-131 has a half life of 8.040 days how long will it take for a 40.0 grams sample of iodine 131 to decay to 0.75g
Answer:
[tex]t=46.13days[/tex]
Explanation:
Hello there!
In this case, since the radioactive decay is considered as first-order kinetic model, whereby the remaining mass of the radioactive material involves the initial one, the rate constant and elapsed time:
[tex]A=Ao*exp(-kt)[/tex]
As we were not initially given the rate constant, we can use the half-life to calculate it as follows:
[tex]k=\frac{ln(2)}{8.040days}=0.08621days^{-1}[/tex]
Thus, we can calculated the elapsed time for the given conditions to obtain:
[tex]t=\frac{ln(0.75g/40.0g)}{-0.08621days^{-1} }\\\\t=46.13days[/tex]
Regards!
Given that ammonia (NH3) acts as a weak base in water with a Kb of 1.8 x 10-5 at 298.0 K, calculate the pH at 298.0 K of a solution prepared by mixing 100.0 mL of a 0.050 M aqueous solution of ammonia with 20.0 mL of a 1.00 M aqueous solution of nitric acid. The final volume of the solution is 120.0 mL.
Answer:
pH = 0.903.
Explanation:
Hello there!
In this case, according to the given information about the problem, we can notice there is a reaction between nitric acid and ammonia, whereas just the H ions from the former are relevant:
[tex]NH_3(aq)+H^+(aq)\rightleftharpoons NH_4^+(aq)[/tex]
Thus, we first calculate the consumed moles of ammonia, it order to evaluate the moles after the reaction:
[tex]n_{H^+}=0.020L*1.00mol/L=0.020mol\\\\n_{NH_3}=0.100L*0.050mol=0.005mol[/tex]
It means there is a leftover of moles of hydrogen ions of 0.015mol; then, we calculate the molarity of the resulting solution as follows:
[tex][H^+]=\frac{0.015mol}{0.120L}=0.125M[/tex]
Finally, we use the formula for the calculation of the pH to obtain:
[tex]pH=-log(0.125)\\\\pH=0.903[/tex]
Which means this solution is highly acidic.
Regards!
no links pls it’s very unhelpful
answer : i don’t knowww :)
Right spelling:
Answer: I don’t know. :)
which method is suitable for collection a a
carbon dioxide.Explain
Answer:
Carbon dioxide can be collected over water. Carbon dioxide is slightly soluble in water and denser than air, so another way to collect it is in a dry, upright gas jar.
Explanation:
Lewis acid-base concept have the following characteristics except:
A. formation of an adduct
B. formation of a coordinate covalent bond
C. donation and acceptance of an electron pair
D. donation and acceptance of a proton
Answer:
Option A) Formation of an adduct.
Explanation:
Lewis acid-base concept have the following characteristics except? Option A. Have a great day .
The Lewis acid -base concepts states that acid are electron acceptors and bases are electron donors. Hence, this concept is based on the donation and acceptance of electron pair. Thus, option C is correct.
What is Lewis acid -base concept ?According to Lewis concept of acids and bases acids are substances tends to accepts electrons and bases are electron donors. Therefore, Lewis acids are electron deficient or electrophiles.
Similarly Lewis bases are electron rich or nucleophiles. For example BF₃ is a Lewis acid and NH₃ is a Lewis base. Hence, BF₃ can accept electron from the lone pair of nitrogen from the Lewis base NH₃. and forms the acid-base pair NH₃ - BF₃.
Lewis acid- base concepts thus states the donation and acceptance of an electron pair. Hence, option C is correct.
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Question is in picture! Due at 3:45!!!
Ann is studying acid base neutralization reactions and mixes sodium hydroxide and hydrochloric acid. The reactants were clear,
colorless solution and mixing them produces a clear, colorless final solution and the beaker becomes warm. She knows this reaction
forms liquid water and an aqueous salt based on the neutralization rules as shown by the chemical equation. What physical evidence
indicates that there has been a chemical rea
NaOH(aq) + HCl(aq) - NaClaq) + H2 °C)
图 40)
A)
The solution changes color.
B)
Precipitate formation occurs.
C)
The beaker changes temperature.
D)
Gas bubbles form during the reaction.
Answer:C
Explanation:
Got it right in usatestprep
The physical evidence that indicates that there has been a chemical reaction is that the beaker changes temperature and the correct option is option C.
What is Neutralization reaction?
Neutralization is a chemical reaction in which acid and base react to form salt and water. Hydrogen (H⁺) ions and hydroxide (OH⁻ ions) react with each other to form water.
The strong acid and strong base neutralization have a pH value of 7.
The beaker gets warm which indicates that the reaction between acid and base is an exothermic reaction releasing heat energy into the surroundings.
Therefore, The physical evidence that indicates that there has been a chemical reaction is that the beaker changes temperature and the correct option is option C.
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M
Mass can be measured in local units like dharni pau eto. Discuss the advantages of using
standard units of mass over the local units of mass. (Any two points)
N2 Points)
soup answer
Answer:
1.They are reliable.
2.They dont vary from person to person
6. When you're fighting over a toy with your brother you might
exclaim this ...?
Hey, this is my toy so I get to use it.
Or, GIVE IT TO ME YOU LITTLE SH*T!
Either one does the trick but i recomemmnd the second option
determine the pH of 0.150 M KOH
Answer:
pH=12.88 i believe that's the answer
Describe the process used to dilute a stock solution?
Answer:
Heyaa!! I'm *✧･ﾟ:*Pinky!! *:･✧ And i'm here to inform you that you're answer is...
Explanation:
✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧✧･ﾟ:*✧･ﾟ:*✧･ﾟ:
*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧*:･ﾟ･ﾟ
*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧ !!!!! Answer: add more solvent to decrease the concentration. A stock solution is a concentrated form of a particular chemical. To make a solution from the stock solution, a required amount of the stock solution has to be taken out and this will be diluted with pre-calculated amount of the correct solvent !!!! *:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧
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*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧*:･ﾟ･ﾟ
Have An Amazingly Good Day!!
~Pinky~
how do some plants grow and survive in the harshest environments like the dessert or under water
Answer:
Adaptation
Explanation:
Some plants grow and survive in the harshest environments like the desert or underwater by adapting to the environment. For example, some plants in the desert have thick, waxy skin to reduce loss of water and to reflect heat. They also have large, fleshy stems to store water. Also, specific plants like cacti in the desert have spikes to protect them from animals wishing to use stored water. These adaptations help them to grow and survive in the desert.
In the ocean, plants have adapted to absorb all the water and carbon dioxide they need from the water they live in. Just as cacti have adapted to live in brutally hot deserts, ocean plants have adapted to deal with things like ocean tides and the salinity (or salt levels) of the water around them. Many ocean plants cling tightly to rocks in order to avoid being swept away by ocean tides.
Hope this helps! Can I have brainliest?
I don't understand with the question number 4, does anybody understand how to do it?
Answer:
iodine = I
sodium= Na
oxygen= O2
aluminum = AI
nitrogen=N
sulfur= S
bromine =Br
magnesium =Mg
NEED ASAP!
Describe how scientific discoveries have changed our culture, national and international legislation.
Answer:
discoveries that can change little aspects of our daily lives or finding cures for diseases that have hounded humanity, scientists have been hard at work trying to push us toward a brighter future.
Explanation:
thats what i got from my research :D
Which characteristics do stable ecosystems tend to have
Answer:
Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. Biotic factors include plants, animals, and other organisms. Abiotic factors include rocks, temperature, and humidity. Every factor in an ecosystem depends on every other factor, either directly or indirectly.
A sample of chlorine gas occupies a volume of 0.025L at 300 K. At 600K, what will the volume be?
A)808 L
B)50 L
C)0.050 L
D)0.088 L
Answer: The volume at 600 K will be 0.050 L.
Explanation:
Given: [tex]V_{1}[/tex] = 0.025 L, [tex]T_{1}[/tex] = 300 K
[tex]V_{2}[/tex] = ?, [tex]T_{2}[/tex] = 600 K
Formula used is as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{0.025 L}{300 K} = \frac{V_{2}}{600 K}\\V_{2} = 0.050 L[/tex]
Thus, we can conclude that the volume at 600 K will be 0.050 L.
A reaction yield 6.26 g of a product what is the percent yield if the theoretical yield is 18.81 g
Explanation:
remember the equation percentage yield = actual/theoretical yield
so 6.26/18.81 X 100 gives u 33.28017012 so to 3 SF ot would be 33.3%
hope this helps:)
The statement, that describes the percent yield is 33.280 g.
What is percent yield?The percent yield is the ratio of actual yield to theoretical yield. It is computed by dividing the experimental yield by the theoretical yield and multiplying the result by 100 percent. If the actual and theoretical yields are equal, the percent yield is one hundred percent.
To express the efficiency of a reaction, use the following formula: percent yield
= (actual yield/theoretical yield) x 100
= (6.26 g/ 18.81 g) x 100
= 33.280 g
Hence the correct answer is 33.280 g.
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The tetrahedral arrangement of bonds formed by carbon and its relevance In the interaction of biomolecules
Answer:
Due to the presence of 4 valence electrons.
Explanation:
The tetrahedral arrangement of bonds formed by carbon and its relevance In the interaction of biomolecules occurs because the carbon atom has four electrons in their outermost shell and the four hydrogens has one electron each which result is a total of eight electrons distributed in four bonding orbitals making the structure of tetrahedral and the bond angles between these carbon atoms is approximately 109.5 degree.
Which of the following is most helpful for identifying an organism using a dichotomous key?
Its average lifespan
Its sources of food
Its habitat
Its physical structures
Answer:
Its physical structure
Explanation:
For Fe, its atomic number is 26 and its mass number is 56. How many neutrons does it have?
Answer:
the number of neutrons available is 30
Explanation:
Given that
The atomic number is 26
And, the mass number is 56
We need to determine the number of neutrons does it have
So, the number of neutrons is
= Mass number - atomic number
= 56 - 26
= 30
Hence, the number of neutrons available is 30
The same would be considered and relevant
If 25.5g of sodium thiosulphate was dissolved in 40g of distilled water at 25°C,
I). Calculate the solubility of the solute in mol/dm^3
II). Calculate the solubility in g/dm^3
Answer:
Formula: Na2S2O3
we get solubility.
Divide the mass of the compound by the mass of the solvent and then multiply by 100 g to calculate the solubility in g/100g .
Solution given:
mass of sodium thiosulphate [m1]=25.5g
mass of water [m2]=40g
at temperature [t]=25°C
we have
solubility in g/dm^3 :[tex] \frac{solute in gram}{solvent in gram} *100[/tex]
=[tex] \frac{25.5}{40}*100 [/tex]=63.75g /litre=63.75g/dm³solubility in g/dm^3 :63.75g/dm³
now
solubility of the solute in mol/dm^3=:63.75g/dm³/178=0.4 mol/dm³
Define trace gas in simple
Please help me!! And please no links!!!!
Write a clear scientific explanation of how and why the water ended up on the mirror and not in the tub. Be sure to include scientific vocabulary (including any phase changes that occurred and the role of kinetic energy).
Vocabulary words-
Condensation
Gas
Heat
Kinetic energy
Liquid
Steam
Vaporization
Water vapor
Answer:
The water was hot it turned into steam then turned to water vapor and the got attached to the glass and as the gas got attached the glass and it built up then became water again. As the vaporization was happening the gas was moving hence the energy building up.
Explanation:
which element have the formula C6H12O6?
Answer: Glucose is a simple sugar with six carbon atoms and one aldehyde group.
Explanation: hope this helps you
Answer:
the answer of this is glucose
How many days does it take the moon to orbit the Earth once.
Answer:
27.3 days
Explanation:
I really have no explanation lol.
Answer:
Hope thia helps
Explanation:
it takes 27.3 days!!!
what is the use of connective tissue
Answer:
Explanation:
Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body. Connective tissues can have various levels of vascularity.
Answer:
Connective tissues can have various levels of vascularity.
Explanation:
What can you say about the forces between the particles of these gases)
Answer:
Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.
Explanation:hopes this helps:)
Why do clouds appear and disappear?
Answer: Clouds are composed of liquid suspended water droplets in about a 100% RH environment. The three primary ways that clouds dissipate is by (1) the temperature increasing, (2) the cloud mixing with drier air, or (3) the air sinking within the cloud. Many things can increase the temperature of the cloud, like the sun, or warm air radiating off of the ground. That's why low fog and clouds tend to disappear as it warms up during the day. ... The air within the cloud descends - When the air descends, it warms.
Explanation:
PLS HURRY TY top says "Part Two: Look at the molecules shown below. Count the number of atoms of each element and write the molecule’s formula. (You may not get the exact order of the elements in the formula, but you must have the number of atoms of each element correct.) An example has been provided. Additionally, in the boxes with an asterisk (*), write the name of the compound (from front). "
Answer: capsaicin C18 H27 NO3
Explanation: I just know the last one sorry G
PLESE HELP WILL GIVE BRAINLYESTY
Imagine that you are Francis Bacon. Write a short autobiographical statement that talks about who you are, where you’re from, and some of your important contributions.
Answer:
My name is Francis Bacon I am a English philosopher and statesman. i was born on January 22, 1561, at York House off the Strand, London. Today, Bacon is still widely regarded as a major figure in scientific methodology and natural philosophy during the English Renaissance. Having advocated an organized system of obtaining knowledge with a humanitarian goal in mind, he is largely credited with ushering in the new early modern era of human understanding.
Explanation: