Answer:
don't click on the link above me it's a scam bot
A student prepares two solutions as shown. The dots represent solute particles. The student wants to test the conductivity of each solution. Prior to carrying out the investigation, the student needs to identify the variables being controlled and the variables being changed between the two solutions.
A.
The volume of the solution and the number of solute particles are being changed between the two solutions, but the concentration of the solution is being held constant.
B.
The number of solute particles and the concentration of the solution are being changed between the two solutions, but the volume is being held constant.
C.
The number of solute particles is being changed between the two solutions, but the volume and concentration of the solution is being held constant.
D.
The volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant.
Answer:
I think its D
Explanation:
It cant be B or C bc the solute particles arent changing. And its not A because the concentration isnt constant
The volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant.
What is conductivity?The term conductivity refers to the movement of electric current through a solution and it depends on the avilability of ions in the solution.
When measuring the conductivity of solutions, the volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant.
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In the reaction 4 Sb + 3 O2 --> Sb406, how many moles of antimony are
required to fully react with 8.00 moles of oxygen?
O 5.34 moles
O 10.7 moles
O 6.00 moles
O 12.0 moles
PLEASE HELP!!
Answer:
1.667 moles of antimony will be produced
What volume of H2S is needed to produce 14.2 L of SO2 gas? The balanced equation is: 2H2S + 3O2 → 2SO2 + 2H2O.
Answer:
14.2 L H2S
Explanation:
Mole ratio
2 mol H2S:2 mol SO2
We are just looking for volume, so the required amount is the same as the produced amount as long as the mole ratio is balanced.
The balanced equation is: 2H2S + 3O2 → 2SO2 + 2H2O. Mole ratio 2 mol H2S:2 mol SO2.
What is Mole ratio?Two factors can be used to identify stoichiometry problems: the information provided in the problem and he information that needs to be solved for, also known as the unknown.
The given and the unknown might both be reactants, could both be products, or could both be products with one of them acting as a reactant. Mole amounts can be used to express the substance quantities.
However, it is typical in a laboratory setting to calculate a substance's mass in grams to determine how much of it is present. A gaseous substance's volume can be used to express its quantity.
Therefore, The balanced equation is: 2H2S + 3O2 → 2SO2 + 2H2O. Mole ratio 2 mol H2S:2 mol SO2.
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4 Catalytic converters can remove carbon monoxide.
a Give a word equation for the reaction that takes place.
b What is the purpose of the transition elements?
Answer:
a) CO+O2→CO2.
b) Copper is an ideal example of a transition metal with its variable oxidation states Cu2+ and Cu3+. The incomplete d-orbital allows the metal to facilitate exchange of electrons. Transition metals can both give and accept electrons easily, thereby making them favourable as catalysts.
Explanation:
A gas at 55.0°C occupies a volume of 3.60L. What volume will it occupy at 30.0° C?
Pressure is constant
Answer:
3.33L
Explanation:
which element's properties are similar to potassium
.In a _____ relationship one variable increases and a second variable increases proportionally,
A. inverse relationship/inversely proportional
B. direct relationship/directly proportional
C. converse relationship/conversely proportional
Answer:
Explanation: b
If you hear a weather report say that a low pressure system is coming in, what kind of
weather can you expect?
A
wind
B
polluted air
precipitation
D
heat
Answer:
It would be A
Explanation:
Answer:
A - wind
Explanation:
A low pressure system is a whirling mass of warm, moist air that generally brings stormy weather with strong winds. When viewed from above, winds spiral into a low-pressure center in a counterclockwise rotation in the Northern Hemisphere.
PLEASE HURRY I'M TIMED Where does the flow of energy begin in every ecosystem?
the consumers
the producers
the sun
the herbivores
What are 2 diseases caused by coronaviruses?
Humans have altered the composition
of Earth's atmosphere by
A. Making the air pressure drop
B. Making the air temperature drop
C. Polluting it with excess ozone
D. Polluting it with carbon dioxide gas
The answer is most likely D
the manager of a bookstore uses the equation s = p - 3.5 to find the price a student pays for books
ill mark brainliest
Answer:
Third one
Explanation:
a student was investigating the reaction between marble chips and dilute hydrochloric acid
Answer:
Marble chips react with dilute hydrochloric acid to produce carbon dioxide gas. The rate of this reaction can be changed by changing the size of the marble chips.
Explanation:
Hope it helps u
FOLLOW MY ACCOUNT PLS PLS
Identify each of the following as a single bond, double bond, or triple bond.
In the reaction below, 22 g of H2S with excess
O2 produced 5 g of sulfur.
? H2S + ? O2 → ? S + ? H2O .
What is the percent yield of sulfur?
Answer in units of %.
Answer:
24%
Explanation:
From the question, the limiting reactant is H2S.
The reaction equation is;
2H2S + O2 → 2S + 2H2O
Number of moles of H2S reacted = 22g/34 g/mol = 0.647 moles
According to the reaction equation;
2 moles of H2S yields 2 moles of sulphur
0.647 moles of H2S yields 0.647 moles of sulphur
So;
Theoretical yield of sulphur = 0.647 moles * 32 g/mol = 20.7 g
Actual yield = 5 g
% yield = actual yield/theoretical yield * 100
% yield =5 g/20.7 g * 100
% yield = 24%
4 InS03 + 3 RSC2 --> 2 In Sc3+3 RS04
Using the balanced equation, if you had 4.3 moles of InSoz, what volume would RS04 occupy at
STP?
Answer:
Explanation:
Consider the reaction 2CO * O2 —> 2 CO2 what is the percent yield of carbon dioxide (MW= 44g/mol) of the reaction of 10g of carbon monoxide (MW=28g/mol) with the excess O2 produces 10g of carbon dioxide? Answer in units of %
Answer:
Y = 62.5%
Explanation:
Hello there!
In this case, for the given chemical reaction whereby carbon dioxide is produced in excess oxygen, it is firstly necessary to calculate the theoretical yield of the former throughout the reacted 10 grams of carbon monoxide:
[tex]m_{CO_2}^{theoretical}=10gCO*\frac{1molCO}{28gCO}*\frac{2molCO_2}{2molCO} *\frac{44gCO_2}{1molCO_2}\\\\ m_{CO_2}^{theoretical}=16gCO_2[/tex]
Finally, given the actual yield of the CO2-product, we can calculate the percent yield as shown below:
[tex]Y=\frac{10g}{16g} *100\%\\\\Y=62.5\%[/tex]
Best regards!
PLEASE HELP ASAP
which is a primary consumer?
Picture shown above
zooplankton cod and krill
1. Determine los gramos obtenidos de hidróxido de calcio [Ca(OH)2], al reaccionar 12 g de óxido de calcio (CaO) con agua.
Answer:
15,86 g Ca(OH)₂ ≅ 16 g
Explanation:
La ecuación química balanceada para la reacción entre el óxido de calcio (CaO) y el agua (H₂O) para formar hidróxido de calcio (Ca(OH)₂) es la siguiente:
CaO(s) + H₂O(l) → Ca(OH)₂(ac)
De acuerdo a esta ecuación, 1 mol de Ca(OH)₂ es producida a partir de 1 mol de CaO. Convertimos las moles a gramos utilizando la masa molecular (MM) de cada compuesto:
MM(CaO)= 40 g/mol Ca + 16 g/mol O = 56 g/mol
⇒ 1 mol CaO x 56 g/mol CaO = 56 g CaO
MM(Ca(OH)₂) = 40 g/mol Ca + (2 x 16 g/mol O) + (2 x 1 g/mol H) = 74 g/mol
⇒ 1 mol Ca(OH)₂ x 74 g/mol Ca(OH)₂ = 74 g Ca(OH)₂
Por lo tanto, la relación estequiometrica es:
1 mol Ca(OH)₂/1 mol CaO = 74 g Ca(OH)₂/56 g CaO
Multiplicando la relación estequiométrica por la masa real de CaO (12 g), obtenemos los gramos obtenidos de Ca(OH)₂:
12 g CaO x 74 g Ca(OH)₂/56 g CaO = 15,86 g Ca(OH)₂
An empty beaker weighs 20g and when filled with
Kensene weighs 60g. If the Volume of the kerosene is 15cm2 calculate
the density of the kerosene
Answer: The density of kerosene is [tex]2.7g/cm^3[/tex]
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Given : Mass of kerosene = mass of beaker with kerosene - mass of empty beaker = 60 g - 20 g = 40 g
Volume of kersone = [tex]15cm^3[/tex]
Putting in the values we get:
[tex]Density=\frac{40g}{15cm^3}[/tex]
[tex]Density=2.7g/cm^3[/tex]
Thus the density of kerosene is [tex]2.7g/cm^3[/tex]
Why group the microscopic molecules known to form substances
that we find in the world, such as water and salt?
Answer:
Explanation:
he gave you a virus, dont click it
_______ have cells that are all dried out.
Explanation: the answer plant seeds
not skin
What is the pH and pOH of a 2.34 x 10^-5 NaOH solution?
Answer:
pOH = 4.63
pH = 9.37
Explanation:
Because NaOH is a strong base, it will completely dissociate, which means you can find pOH by taking the negative log of the concentration of hydroxide ions: pOH = -log(OH) = -log(2.34 x 10⁻⁵) = 4.630784143
To find pH use 14.00 = pH + pOH
pH = 14.00 - 4.630784143 = 9.369215857
If the pressure of a gas changes, but the number of moles and volume remain constant, which
of the following values must also change?
Answer:
Pressure
Explanation:
Short Answer/Essay
Note: Your teacher will grade your responses to questions 19 and 20 to ensure you receive proper credit for your answers.
What is global warming? What can people do to reduce global warming?
Answer:
lol global warming is the gradual increase in the temperature of the earth and its atmosphere. this is do to the greenhouse effect caused by increased levels of carbon dioxide.
Explanation:
common knowledge
2) A bicycle rider is traveling up a hill. When the rider reaches the top of
the hill, she stops to rest. Then she travels down the hill. The diagram
shows the rider in the three different positions. Which of these correctly
describes the potential energy and kinetic energy of the bicycle rider?
Answer: A: When the rider is at the top of the hill, her potential energy is greatest, and her kinetic energy is the least.
Explanation:
Why is the solvation energy negative?
a) bonds are being created
b) bonds are breaking
Answer:
your answer will be b) bonds are breaking
Compounds with a ring of resonance bonds are called
Answer:
they are aromatic compounds
Explanation:
all gotten from benzene
Are mossed and ferns climax community or pioneer species
Answer:
Pioneer species I believe.
Explanation:
Consider the reaction below.
HI + H2O → H30++
Which is an acid-conjugate base pair?
O HI and H20
O H2O and Hž0+
OH30+ and I
O HI and
Answer:
HI and I-
Explanation:
Hello there!
In this case, according to the acid ionization of hydroiodic acid:
[tex]HI+H_2O\rightarrow I^-+H_3O^+[/tex]
Now, since the acid, HI, results in the conjugate base, I- and the base, H2O in the conjugate acid, H3O+, it is correct to assert that the acid-conjugate base pair is HI and I-
Best regards!
The acid-conjugate base pair in the reaction above is HI and I-. Details about conjugate base can be found below.
What is a conjugate base?A conjugate base is the substance formed when an acid loses or donates its proton or hydrogen ion.
According to this question, the following reaction is given:
HI + H2O → H30+ + I-
The acid in this reaction is HI while the conjugate base is I-.
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