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Question 21 of 25
Which of the following best describes an Arrhenius acid-base reaction?
O A. Acid + base = H+ + OH-
B. Acid + base = salt + water
C. Acid + base = conjugate base + conjugate acid
D. Acid + base =
H20
Answers
Answer:
B. Acid + base = salt + water
Explanation:
In accordance to the proposal of a scientist called Svante Arrhenius, an acid is a substance that increases the H+ concentration of a solution by dissociating into it while the base increases the OH- concentration of a solution by dissociating into it. Furthermore, Arrhenius stated that this two ions combine in an aqueous solution to give water.
Hence, Arrhenius acid-base reaction is the combination of an acid and base to produce salt and water as products. That is; Acid + base = salt + water.
An aluminum soft drink can is approximately 0.55 moles of aluminum. How many
aluminum atoms are used in manufacturing each soft drink can?
Answers
Explanation:
Round 87.073 meters to 3 significant figures. write your answer in scientific notation. step 1: 87.073 rounds to step 2: write scientific notation : meters...
One mole of aluminum contains 6.022 × 10²³ atoms. This number is called Avogadro number. Therefore, 0.55 moles of aluminum contains 3.31 × 10²³ atoms.
What is Avogadro number ?One mole of any substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.
Aluminum is 13th element in periodic table. It shows metallic properties as well as some non-metallic properties. The symbol of aluminum is Al. It forms compounds mostly through covalent bonding.
One mole of aluminum contains 6.022 × 10²³ atoms.
Thus, number of atoms in 0.55 moles = 0.55 × 6.022 × 10²³ = 3.31 × 10²³ atoms.
Therefore, the number of Al atoms in 0.55 moles is 3.31 × 10²³ .
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pleassee help asap its only one question ..its the bottom one and its 30 points plzzzzzzzz
Answers
Answer:
sorry !
Explanation:
Some factories that burn coal produce smoke with harmful chemicals, such as sulfur. Scrubbers are devices that are attached to the smokestacks to reduce the amount of sulfur put into the atmosphere. To evaluate the effectiveness of these devices, what data would need to be collected?
Answers
Answer:
4.5 CH4 (g) + 2 O2 (g) CO2 (g) + 2H2O (l) +ENERGY Hydrocarbon fuels like methane (CH4) burn in the presence of oxygen to produce carbon dioxide and water. This process of combustion releases energy. When energy is released during the course of a chemical
Explanation:
in the balanced chemical reaction shown below, what is the molar ratio of O2 to H2O
C3H8(g) + 5O2(g)—> 3CO2(g) + 4H2O(g)
A. 4:3
B. 3:1
C. 5:4
D: 5:3
Answers
the molar ratio of O2 to H2O is C. 5:4.
What is the C3H8 to H2O mole ratio?Looking at the coefficients, the stoichiometric proportion of water to methane (C3H8) is 4:1.In other words, 4 moles of water were produced for every mole of propane that is utilized.Hence, 0.1486 moles of C3H8 will be required for propane in order to produce 0.5944 moles of H2O.
What kind of reaction does ch4 g)+ 2o2 g)+ 2H2O g) represent?Combustion is the correct response (letter C).An illustration of a complete combustion is the one that was given.Oxygen gas is a reactant in a combustion reaction that results in the products carbon dioxide and water.
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https://www.sciencenews.org/article/first-black-hole-discovery-cygnus-massive
Can someone read the article and write a two paragraph summary for me? (anyone who is not busy and someone who can write)
The second paragraph is how this information affects the world and life as we know it.
I will give you 20 points or more if its good + Brainlist
Answers
Answer:
Cygnus X-1 21 is the heaviest stellar hole to be discovered. Cygnus X-1 21 weighs 21 times as the sun's mass. Scientists previously assumed wrong, it is around 1.5 times heavier then the last estimate. Cygnus X-1 21 was discovered by scientists using VLBA (Very Long Baseline Array.) This was discovered without gravitational waves which is usually used in science.
The network is 10 radio dishes and ranges to the United States, from Hawaii to the Virgin Islands. VLBA was responsible for tracking radio-bright jets of material flowing out of Cygnus X-1’s black hole for six days straight. Cygnus X-1 is around 7,200 light-years from Earth, which contradicts the last estimate of 6,000. The measurement for this new discovery gives astronomers a tough challenge in their understanding of black holes. Theres more to come in science with each discovery made.
Explanation:
is this good?
substances decrease in size on __ (heating/ cooling) and contract.
Answers
It is for this reason that many substances become more dense as temperature decreases. For example, cold air (which is technically a mixture, but it works for our purposes) is denser than warm air, and cold water is denser than warm water. Density is defined as the amount of mass per volume. If the temperature is reduced, the amount of mass isn’t changed. So the increase in density must be due to the change in volume; for density to go up, the volume must go down. One can consider this in isolation: a balloon placed in a freezer will shrivel up as the “size” of the gas inside the balloon decreases.
There are, of course, exceptions, the most famous perhaps being water. While water, like most liquids, does decrease in size on cooling, it only does so up to a point (specifically 4 degrees C); after this point, water expands (its volume increases and density decreases) as it is cooled further, which holds even after it freezes; that is why solid water (ice) floats in liquid water—which isn’t the case with many other substances whose solids states are denser than their liquid states.
Which geological process occurs over the longest time scale?
Select one:
Earthquakes
Volcanic eruptions
Weathering
Landslides
Answers
Answer: weathering
Explanation: It is slowly by wind or by water
Fill in the Blank
Complete the following sentence.
An example of
is the weight of a soil sample.
Answers
Answer: Quantitative data
Explanation:
hey ;) butiful+hansome= me and you❤
Answers
Answer:
okay
Explanation:
eheu3u2u9q8skee gg uwiqj292 in dn ii nwkedd
Answer:
ok ok i see you
Explanation:
(but you spelled beautiful and handsome wrong just saying for the next time you wanna use that XD)
A room is filled with 45.0 kg of Nitrogen gas (N2). If the temperature of the gas is 26.0 degrees C and has a pressure of 794 torr, what is the volume of the room, in gallons? (1 gal = 3.785 L)
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Hi this is not a answer but I just wanna warn you so listen to these person just in case u see that scammer
Select the structure that corresponds
to the name:
3,5,6-trichloro-2-heptanol
Answers
Answer:C both
Explanation:
The Structure that correspondsto the name: 3,5,6-trichloro-2-heptanol is C both.
How nomenclature is done in organic compound ? First name the principal carbon chain and also check type of bonds single or double present on the carbon chain. Name the functional group according to Seniority table. Name the substituent alphabetically. Both are isomers∵ all are substituent and OH alcohol is added on the principal carbon chain both names are suggested.
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For a particular reaction at 135.4
°C, Δ=−775.41 kJ/mol
, and Δ=817.91 J/(mol⋅K)
.
Calculate ΔG for this reaction at 12.7
°C.
Answers
Answer:
[tex]\Delta G=-675.38 \frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, for this problem, it is possible to use the thermodynamic definition of the Gibbs free energy:
[tex]\Delta G=\Delta H-T\Delta S[/tex]
Whereas G, H and S can be assumed as constant over T; thus, we can calculate H at 135.4 °C:
[tex]\Delta H=\Delta G+T\Delta S\\\\\Delta H=-775.41\frac{kJ}{mol}+(135.4+273.15)K*(0.81791\frac{kJ}{mol*K} )\\\\\Delta H=-441.58\frac{kJ}{mol}[/tex]
Now, we can calculate the Gibbs free energy at 12.7 °C as shown below:
[tex]\Delta G=-441.58\frac{kJ}{mol} -(12.7+273.15)K*0.81791\frac{kJ}{mol*K}\\\\\Delta G=-675.38 \frac{kJ}{mol}[/tex]
Best regards!
if the density is 2 mL and the mass is 18 grams what is the density
Answers
Given that,
Volume, d = 2 mL
Mass, m = 18 grams
We have to find the density. Density of an object is equal to mass per unit volume. It can be given by:
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{18\ g}{2\ cm^2}\\\\d=9\ g/cm^3[/tex]
So, the density is 9 g/cm³.
2 HBr(g)+O2(g)—>H2O2(g)+Br2(g)
Based on a kinetics study of the reaction represented by the equation above, the following mechanism for the reaction is proposed. Which of the following rate laws is consistent with the proposed mechanism?
Answers
Answer:
b
Explanation:
The rate law which is consistent withe the given chemical equation is rate=k[HBr][O₂] as the rate of reaction is dependent on concentration of both reactants that is HBr and oxygen.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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what is fermentation
Answers
Fermentation is a metabolic method that creates chemical changes in natural substrates through the action of enzymes.
Explanation: hope this helps :)
Calculate the molarity of 32.5 g of MgS in 935 mL of solution.
Answers
You convert 841 mL of solution to 0.841 L
You convert 32.1g of MgS to mol by dividing by molar mass of MgS (which is 56.4g)
what is the reaction type for Zn(C2H3O2)2 + Na3(PO4)?
Answers
Answer: This is a precipitation reaction: Zn 3(PO 4) 2 is the formed precipitate.
Explanation:
Go this Answer form, (chemequations.com)
Im Glad I helped! =)
FOR BRAINLIST!!!
A Student 1
B Student 2
C Student 3
D Student 4
Answers
Answer:
Student 2
Explanation:
I am not 100% sure but I would say Student 2
:)
i agree with the other answer
Your friend John is having trouble with his compost bin. The material in his compost pile doesn't seem to be decomposing
well. You take a sample of the pole and check for the presence of microorganisms under the microscope You see that there
are indeed microorganisms, however, they don't appear to be growing very fast John says that he regularly mixes his
compost pile to expose it to oxygen What is the most likely explanation for this problem?
The temperature may not be high enough to encourage microorganism growth
Inorganic materials may have been included in the compost pile
The temperature may be too high for microorganisms to tolerate
Inappropriate food waste may have been included in the compost pile
Answers
a 75.0 balloon hold 59.3g of neon gas. the gas is released until the balloon volume is 61.8 L. how many grams of neon escaped?
Answers
Answer:
A rigid tank holds a 2.91 moles of gas at a pressure of 772 kPa. What will the pressure be if another 1.09 moles of gas is added?
Explanation:
If a combination reaction takes place between lithium and fluorine, the chemical formula for the product is A. LF B. LiF C. LiF2 D. Li2F
Answers
Thus, B would be the correct answer.
Equal chemical equations!
H2 + Cl2 ----> HCl
P4 + O2 ----> P4O10
Na + Cl2 ----> NaCl
CH4 + O2 ----> CO2 + H2O
Answers
Answer:Na+Cl2---->NaCl
Explanation:
Answer:
I've balanced the equations.
They are in the attached image.
The values in red are the added number to make the equation balanced .
The reaction Cl2(g) + 2KBr(aq) --> 2KCl(aq) + Br2(l) is a(n)
Group of answer choices
single-replacement reaction.
ionic reaction.
combustion reaction.
synthesis reaction.
Answers
Answer:
synthesis reaction
Explanation:
The reaction represents by the equation C12+ 2kBr(aq) +Br2(l) is a(n) single displacement. in one type of synthesis reaction, an element combines with oxygen to yield a(n) oxide.
Answer:
I know I'm late but its actually a single-displacement reaction.
Explanation:
Chlorine replaces Bromine
Which one of the following processes does NOT use Calcium?
Group of answer choices
Component of thyroxine
Muscle contraction
Nervous impulses
Blood coagulation
Answers
In the combustion reaction between propane and oxygen gas, if 44.0 g of propane is burned
in 160.0g of oxygen. How many total grams of products will be formed if the Law of
Conservation of Mass is fulfilled?
A.116.0g B.126.0g C.204.0g D.214.0g
Answers
Have a nice day
A buffer solution contains 0.479 M C6H5NH3Cl and 0.352 M C6H5NH2 (aniline). Determine the pH change when 0.102 mol NaOH is added to 1.00 L of the buffer.
Answers
Answer:
ΔpH = 0.05
Explanation:
The pKa of aniline is 4.6.
Using H-H equation for aniline, we can find the pH of the buffer before the addition of NaOH:
pH = pKa + log [C6H5NH2] / [C6H5NH3Cl]
pH = 4.6 + log [0.352] / [0.479]
pH = 4.47
Now, NaOH will react with C6H5NH3Cl as follows:
NaOH + C6H5NH3Cl → C6H5NH2 + NaCl + H₂O
That means, the moles of C6H5NH3Cl after the reaction are its initial moles - moles added of NaOH and moles of C6H5NH2 are initial moles + moles NaOH
In 1.00 of buffer, the moles of C6H5NH3Cl are 0.479 moles and moles of C6H5NH2 are 0.352 moles. The moles after the reaction are:
C6H5NH3Cl = 0.479 mol - 0.102mol = 0.377mol
C6H5NH2 = 0.352mol + 0.102 mol = 0.454mol
The pH will be:
pH = 4.6 + log [0.377mol] / [0.454mol]
pH = 4.52
And the change in pH will be:
4.52 - 4.47 =
0.05
How many moles of N2 could fit in a 2.00L soda bottle at 23° and 755 Mmhg
Answers
Answer:
convert units --> PV=nRT --> PV/RT=n --> moles to molecules.
(0.993atm*2.00L)/(0.08206*296.15K)=0.08176 mol N2
0.08176 mol*(6.022x10^23 molecules/1 mol)=4.92x10^22 molecules N2
Explanation:
Which is a description of objects found in abundance between Mars and
Jupiter?
Answers
I am not sure but rocky bodies ranging from large to small in size
In which of these two states of matter is water the least dense: solid or liquid?
Answers
Answer:
liquid
Explanation:
it is only the thing in what water can disslove