The energy that is provided by the spark of the match is called the activation energy.
What is the activation energy?
The term activation energy is the energy that is required for a reaction to start up. We know that a spontaneous reaction refers to the type of reaction that is able to proceed on its own once it has started. It does not require a continuous supply of energy to proceed.
In this case, the energy that is required to start off the reaction is the activation energy ad that is what is provided by the match that sparks.
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a student pipettes 5 ml of vinegar into a erleyenmayeer flask adds indictator and 25 ml of distilled water and titrates it with 0.1098M naoh. calcualte the concentraion of acetic acid in the vinegar if the intitial volume reading on the burrette was 1.35 ml and the final reading is 37.83ml
The concentration of the solution is obtained as 0.134 M.
What is the concentration of the acetic acid?We know that titration is a method of analysis that depends on the volume of the solutions in order to determine the concertation.
We know that;
Total volume of the vinegar = 5 ml + 25 mL = 30 mL
Concentration of the sodium hydroxide = 0.1098M
Volume of the sodium hydroxide used = 37.83ml - 1.35 ml = 36.48 mL
Using the formula;
CAVA/CVB = NA/VB
CAVANB = CBVBNA
CA= CBVBNA/VANB
CA = 0.1098 * 36.48 * 1/30 * 1
CA = 0.134 M
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A stack of newspapers is burned completely to ash in a laboratory. How does the resulting mass relate to the initial mass of the stack of newspapers?
Responses
The mass of the gases and the ash should be one-fourth the mass of the initial stack of newspapers.
The mass of the gases and the ash should be one-fourth the mass of the initial stack of newspapers.
The mass of the gases and the ash should be double the mass of the initial stack of newspapers.
The mass of the gases and the ash should be double the mass of the initial stack of newspapers.
The mass of the gases and the ash should equal the mass of the initial stack of newspapers.
The mass of the gases and the ash should equal the mass of the initial stack of newspapers.
The mass of the gases and the ash should be one-half the mass of the initial stack of newspapers.
The following data was collected when a reaction was performed experimentally in the laboratory. What is the maximum amount of NaNO3?And how did you find the amount?
Explanation:
We are given: moles of Al(NO3)3 = 4 mol
: moles of NaCl = 9 mol
We know: molar mass of Al(NO3)3 = 212.996 g/mol
: molar mass of NaCl = 58.44 g/mol
: molar mass of NaNO3 = 84.9947 g/mol
The balanced chemical equation is given as:
[tex]Al\left(NO_3\right)_3+3NaCl\rightarrow3NaNO_3+AlCl_3[/tex]Number of moles of NaNO3 from Al(NO3)3:
[tex]\begin{gathered} n(NaNO_3)\text{ = n\lparen Al\lparen NO}_3)_3)\times\frac{n(NaNO_3)}{n(\text{Al\lparen NO}_3)_3)} \\ \\ \text{ = 4}\times\frac{3}{1} \\ \\ \text{ = 12 mol} \end{gathered}[/tex]Number of moles of NaNO3 from NaCl:
[tex]\begin{gathered} n(NaNO_3)=\text{ n\lparen NaCl\rparen}\times\frac{n(NaNO_3)}{n(NaCl)} \\ \\ \text{ = 9}\times\frac{3}{3} \\ \\ \text{ = 9 mol} \end{gathered}[/tex]Therefore, NaCl is a limiting reagent.
Answer:
The maximum amount of NaNO3 is 9 mol.
By balancing the chemical equation of the given reactants and products. And then use molar ratios and the number of moles to find the limiting reagent.
Which of the following cycles involve molecules from the atmosphere being broken and rearranged into new molecules in living things? (Choose all that apply!)
Choose all that apply:
Rock cycle.
Carbon Cycle
Carbon cycle.
Nitrogen cycle.
Solar cycle.
The cycles that involve molecules from the atmosphere being broken and rearranged into new molecules in living things are Carbon cycle and Nitrogen cycle.
The carbon cycle :
The carbon cycle is studied as two sub-cycles: One sub-cycle deals with rapid carbon exchange between the living organisms and the other deals with long-term carbon cycling by the various geologic processes. Carbon is present in the air as carbon dioxide. It gets dissolved in water and reacts with water molecules which produces bicarbonates. By land plants, bacteria, and algae, photosynthesis converts carbon dioxide into the organic molecules. These are made by photosynthesizers which are passed through the food chains. The cellular respiration forms carbon dioxide gas by converting the organic carbon.
When organic carbon gets stored for a longer term, it happens when matter from living organisms is deep in the ground or gets sink to the ocean bottom. It results in formation of sedimentary rock. Activities of volcano, and burning of fossil fuels brings the stored carbon in the carbon cycle.
The nitrogen cycle
The nitrogen cycle is a cycle of processes which repeats. During this cycle, nitrogen moves by the living and non-living things such as soil, water, plants, animals and bacteria. Microscopic living organisms which contains one cell. To move through the separate parts of the cycle, nitrogen change its forms. Nitrogen exists as a gas N₂ in the atmosphere, but in soil it is present as nitrogen oxide NO, and nitrogen dioxide NO₂. It is used as a fertilizer and found in other forms too like ammonia NH₃. It can be processed further in a fertilizer NH₄NO₃.
The five stages in the nitrogen cycle are nitrogen fixation, mineralisation, nitrification, immobilization, and denitrification. Microbes in the soil turns the nitrogen gas N₂ in volatile ammonia NH₃. Therefore, the fixation process is called nitrogen fixation. When a chemical like NO₃ moves away from the soil or other material and gets leaked into nearby areas, it dissolves in the water and dips out the soil which pollutes the waterways.
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Using your understanding of the specific heat capacity, how many degress in °C will 100g of water (specific heat capacity =4.2J/g•°C) increase if 750J are added to it?
Answer
1.8 °C
Explanation
Given data:
Mass of water, m = 100 g
Specific heat capacity of water, c = 4.2 J/g•°C
Quantity of heat added, Q = 750 J
What to find:
The degree increase in °C, ΔT
Step-by-step solution:
The formula relating specific heat and heat is given by:
[tex]Q=mc\Delta T[/tex]To find ΔT, substitute, m = 100 g, c = 4.2 J/g•°C and Q = 750 J into the formula:
[tex]\begin{gathered} 750\text{ J }=100\text{ g }\times4.2\text{ }J\text{ /g}•\degree C\times\Delta T \\ 750\text{ J }=420\text{ J/}\degree C\times\Delta T \\ \text{Divide both side by 420 J/}\degree C \\ \frac{750\text{ J}}{420\text{ J /}\degree C}=\frac{420\text{ J/}\degree C\times\Delta T}{420\text{ J/}\degree C} \\ \Delta T=1.7857\degree C \\ \Delta T\approx1.8\degree C \end{gathered}[/tex]The degree in °C that 100 g of water increase, if 750 J are added to it, is 1.8 °C
Which of the following are needed to calculate the percent yield? Select all that apply.Excess yieldLimiting yieldActual yieldTheoretical yield
Explanation:
Percent yield can be calculated as follows:
[tex]\text{ \%yield = }\frac{Actual\text{ yield}}{Theoretical\text{ yield}}x100[/tex]So,
Answer:
Actual yield
Theoretical yield
Directions: Answer each of the questions below.
1. Explain Wegener's theory of the first supercontinent.
2. Describe the three types of convergent boundaries.
3. What do scientists use to study the ocean floor? Describe the tools.
4. Why is the theory of plate tectonics important to scientists and the study of the earth?
5. What is the most important topographic feature of the ocean floor? Why?
1) The continental drift theory explains the existence of Pangea as a supercontinent. 2) Between oceanic plates, between continental plates, between an oceanic and a continental plate. 3) technologies like submersibles, sonar, and satellites 4) because it explains volcanoes, mountains, and earthquakes formation and occurrence. 5) Abyssal plains, oceanic trenches, oceanic ridges, fracture zones, continental shelves.
What is Wegener's theory?Wegener proposed for the first time the theory of continental drift.
This theory states is based on the fact that the crust is divided into several plates that can displace over the flowing mantle. The continental drift theory explains how these movements have been taking place for millions of years ago.
Wegener thought that continents were once all together in one big continent named Pangea, and with time, they split and separated into many pieces. These pieces are the current continents.
This theory was heavily criticized and needed many pieces of evidence to be accepted. They involved paleontological, geological, and bathymetry evidence, among others.
What are convergent boundaries?Convergent boundaries refer to two plates moving forward to each other and ending up colliding and causing the deformation of one or both plates.
Two oceanic plates might collide ⇒ subduction
The thickest and oldest plate subduces and causes a deformation on the other plate edge, creating an oceanic trench through which magma rises. Island arcs or insular volcanic arcs are created.
Two continental plates might collide ⇒ obduction
Both plates are too light to subduce (equally dense), so neither of them sinks under the other one.
Occurs a vertical deformation on both plates' edges, which remain attached by a suture area. The result is an inland mountain chain formation.
Oceanic plate and continental plate collide ⇒ Subduction
The oceanic crust sinks under the continental plate, and magma rises to the surface by crevices.
The result is the formation of mountain chains or volcanic chains due to the deformation caused on the continental plate edge.
What do scientists use to study the ocean floor?Different technologies are used to study the ocean floor. To mention a few,
Submersibles are watercraft used to operate underwater. It collects information about the water column and the ocean floor. Sonars are based on sound waves and can be used to measure the ocean's deepness and to create seafloor maps. Satellites are used to create a map seafloor and determine the ocean depth and floor shapes.Remotely operated vehicles are used to explore parts of the ocean.Dredges and gravity corers are used to collect material from the sea bottom. What is the tectonic plate theory?The tectonic plates theory is based on the continual movements of the crust and might explain the movement of the different plates, and their directions and interactions.
This theory became important because it explains how volcanic formation occurs, how mountains emerge, and erathquakes are produced. These events are closely related to tectonic plate movements and their interaction.
Divergent, convergent and transforming boundaries are always linked to these events.
What are the most important topographic feature of the ocean floor?There are five significant features,
Abyssal plains are large and relatively flat areas that cover most of the bottom.Oceanic trenches are deep depressions that can reach great depths. These trenches are associated with most volcanic activities that are parallel to them and global seismic activity.
Oceanic ridges are extensive mountain chains on the ocean floor. These are created in divergent boundaries as plates separate. They have elongated ruptures from which magma and hot water emerge. Some species can inhabit close to these fractures, taking advantage of minerals and warmer temperatures.Large fracture zones separate sections of the mountain ranges. The seabed has different depths and different ages on each side of these fractures. When fractures are too close to each other, they are referred to as fracture zones. These zones are also associated with seismic activity. Extensive continental shelves.
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1. Consider the titration of 0.250 M of 50.0 mL nitric acid (HNO) by 0.350 M NH,. Kb for NH, is 1.8 x 10°. Calculate the pH of the resulting solution after the following volumes of NH, have been added. a. 0.0 mL b. 50.0 mL c. Half-way equivalence point d. At equivalence point e. 150.0 mL
Answer:I got pH = 4.98
Explanation:. This agrees with the fact that strong acid + weak base = acidic pH.
If you notice, the volume and concentration of both
NH
3
and
HNO
3
are identical, and
HNO
3
only has one
H
+
. Therefore, you should convince yourself that these neutralize each other exactly because the number of mols of each are equal.
This leaves the same number of mols of
NH
+
4
as
NH
3
, in TWICE the volume (i.e. don't forget to account for dilution!):
Which is a physical property of milk
Answer:
density, redox properties, colligative properties, surface activity buffering capacity, rheological behaviour, conductivity, thermal properties and color.
Explanation:
Answer: an emulsion of fat, protein in water
Explanation:
What happens to electrolytes when dissolved in water?They break into protonsThey break into ionsThey break into isotopesThey break into electrons
Explanation:
By definition the substances that give ions when dissolved in water are called electrolytes. Electrolytes dissociate into cations (positively charged ions) and anions (negatively charged ions) when dissolved in water.
Answer: They break into ions
In a soccer game, the player with a momentum of 100 kg m/s kicks a ball that is motionless on the ground. After the kick, the player has a momentum of 94 kg m/s, and the ball has a momentum of 6 kg m/s. Was momentum conserved?
Since the momentum after collision is equal to the momentum before collision, the momentum was conserved.
What is the conservation of linear momentum?Let us recall that the principle of the conservation of linear momentum states that the momentum before collision is equal to the momentum after collision.
This implies that the total momentum of the system is constant. The momentum of the object does not change.
The total momentum before collision = 100 kg m/s + 0 kg m/s = 100 kg m/s
Total momentum after collision = 94 kg m/s + 6 kg m/s = 100 kg m/s
Hence the momentum of the system is conserved.
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Please help me with these, I'm confused
The law of conservation of mass states that the mass of substances in a chemical reaction can neither be created nor destroyed.
The law futher expatiates that the amount of substances on the reactant side of a chemical reaction is equal to the amount on the product side of the same chemical reaction.
According to the reaction in the image section of this question, methane is burned in air to produce carbondioxide and water molecules.
However, to fulfill the law of conservation of mass, equal number of atoms must be present for each element on both sides of the equation. When this occurs, the chemical equation is said to be balanced.
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Na2O + H2O à 2 NaOHHow many moles of Na2O are required to react to produce 1.57 moles of NaOH?
Since the reaction is
[tex]Na_2O+H_2O\to2NaOH[/tex]We would first need to balance it, but we can see that it was already balanced.
So, we can just apply the stoichiometry.
Assuming all the Na₂O react, we can just compair the coefficients of Na₂O and NaOH to calculate how much we need.
From the equation, we see that each 1 mol of Na₂O produce 2 moles of NaOH, so using rule of three we have:
Na₂O --- NaOH
x --- 1.57 mol
1 mol --- 2 mol
So we have the relation:
[tex]\begin{gathered} \frac{x}{1mol}=\frac{1.57}{2} \\ x=0.785mol \end{gathered}[/tex]So, we need 0.785 mol of Na₂O.
How many grams of C4H10 are needed to form 85 grams of carbon dioxide?
Answer
The mass of C4H10 needed = 28 grams
Explanation
Given:
The mass of carbon dioxide formed = 85 grams
What to find:
The mass of C4H10 needed to form 85 grams of CO2.
Step-by-step solution:
Step 1: Write the balanced equation for the reaction.
[tex]2C_4H_{10}+13O_2\rightarrow8CO_2+10H_2O[/tex]Step 2: Convert 85 grams of CO2 formed into moles.
Using the atomic masses of C and O from the periodic table; the molar mass of CO2 = 44.01 g/mol.
So, the moles of CO2 in 85 grams CO2 can be calculated using the mole formula
[tex]\begin{gathered} Moles=\frac{Mass}{Molar\text{ }mass} \\ \\ Moles\text{ }of\text{ }CO_2=\frac{85\text{ }g}{44.01\text{ }g\text{/}mol}=1.931379232\text{ }mol \end{gathered}[/tex]Step 3: Determine the moles of C4H10 needed.
Using the mole ratio of C4H10 to CO2 in step 1 and the moles of CO2 formed in step 2; the moles of C4H10 needed is calculated as shown below.
[tex]\begin{gathered} 2mol\text{ }C_4H_{10}=8mol\text{ }CO_2 \\ \\ x=1.931379232mol\text{ }CO_2 \\ \\ Cross\text{ }multiply\text{ }and\text{ }divide\text{ }both\text{ }sides\text{ }by\text{ }8mol\text{ }CO_2 \\ \\ x=\frac{1.931379232mol\text{ }CO_2}{8mol\text{ }CO_2}\times2mol\text{ }C_4H_{10} \\ \\ x=0.482844808\text{ }mol \end{gathered}[/tex]Step 4: Convert the moles of C4H10 in step 3 above to grams.
From the periodic table, the molar mass of C4H10 can be determined to be = 58.12 g/mol.
Using the same mole formula used in step 2, the mass of C4H10 is
[tex]\begin{gathered} Mass=0.482844808mol\times58.12g\text{/}mol \\ \\ Mass\text{ }of\text{ }C_4H_{10}=28.06294024\text{ }grams \\ \\ Mass\text{ }of\text{ }C_4H_{10}\approx28\text{ }grams \end{gathered}[/tex]Therefore, the mass of C4H10 needed to form 85 grams of carbon dioxide is 28 grams
Can someone kindly help me!
Gibbs energy of a reaction can be calculated from the Helmholtz equation as follows: ΔG = ΔH - TΔS. The ΔG for the given reaction is 333214.2 J.
What is Gibbs free energy?Gibbs energy G is the energy stored in a system which is balanced from the energy for work done. The equation to find Gibbs energy change is as follows: ΔG = ΔH - TΔS.
The enthalpy change or ΔH is the difference of total enthalpy of products from the total enthalpy of reactants. In calculation, the standard enthalpy of each species in the reaction must be multiplied with their coefficients.
From the given standard values, ΔH is calculated as follows:
ΔH = ΔH (products) - ΔH (reactants).
= [(2× -733.8) + (3 × -393.5)] - [(-824.5) + (13 × -110.5)]
= - 2035.8 KJ/mol
The entropy change ΔS can be calculated in a similar way from the given values as follows:
ΔS = [(2× 445.2) + (3 × 213.6)] - [(87.4) + (13 × 197.6)]
= -1125 J/(mol K)
The temperature is 298 K thus ΔG can be calculated as follows:
ΔG = ΔH - TΔS
= - 2035.8 KJ/mol -(-1125 J/(mol K) × 298 K)
= 333214.2 J
Therefore, the Gibbs energy change ΔG for the given reaction is 333214.2 J.
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Balance this redox reaction by using the half reaction method. Show your work:
Al + Ni2+ --> Al3+ + Ni
In redox reaction the oxidation state of reactant changes by gain and loss of electron. Which element will take the electron depends on the reduction potential of the element. The balanced redox reaction is
[tex]2Al+3Ni^{+2} \rightarrow2Al^{+3} +3Ni[/tex]
What is redox reaction?Redox reaction is the one in which the one element oxidizes by the loss of electron while the element reduces by taking that lost electron.
The Half reaction for [tex]Al[/tex] is
[tex]Al\rightarrow Al^{+3} +3e^{-}[/tex]
the half reaction for [tex]Ni[/tex] is
[tex]Ni^{+2}+2e^{-} \rightarrow Ni[/tex]
Now to balance the number of electron multiply first reaction by 2 and second reaction by 3 and add these reactions, we will get the balanced equation as
[tex]2Al+3Ni^{+2} \rightarrow2Al^{+3} +3Ni[/tex]
Thus the balanced redox reaction is [tex]2Al+3Ni^{+2} \rightarrow2Al^{+3} +3Ni[/tex]
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Given the following equation:2 C4H10 + 13 O2 = 8 CO2 + 10 H2O ; what is the mole to mole ratio of C4H10 to O2? Mole to mole ratio of O2 to CO2?
2mol C4H10 : 13mol O2
13mol O2 : 8mol CO2
Explanations;Given the combustion of butane reaction expressed as:
[tex]2C_4H_{10}+13O_2\rightarrow8CO_2+10H_2O[/tex]In order to get the mole ratio, we will use the coefficient of the compound in the equation.
For the mole to mole ratio of C4H10 to O2
Coefficient of C4H10 in the equation is 2 while the coefficient of O2 in the equation is 13. Hence the mole ratio of C4H10 to O2 is 2mol C4H10 : 13mol O2
For the mole to mole ratio of O2 to CO2
Coefficient of CO2 in the equation is 8 while the coefficient of O2 in the equation is 13. Hence the mole ratio of O2 to CO2 is 13mol O2 : 8mol CO2
Write one paragraph explaining if the plant will make enough oxygen for a human tosurvive on Mars. Explain how you figured it out.
To know if the plant will make enough oxygen for a human to survive on Mars, we need to calculate how much oxygen it produces using the photosynthesis equation ratio:
1 mole of Glucose --- 6 mol of oxygen
0.09 moles of Glucose --- x mol of oxygen
x = 0.54 moles of oxygen.
According to the data, a human needs 25 moles of oxygen per day to live and the plant produces just 0.54 moles of oxygen. One plant is not enough for a human to survive on Mars. We would need:
0.54 moles of oxygen ---- 1 plant
25 moles of oxygen ---- x plants
0.54x = 25
x = 46.3 plants
We would need 46.3 plants to produce enough oxygen for a human.
Describe the characteristics of single replacement reaction, how it is identified, and what determines if this reaction will occur. Give an example in your response.
Answer:
In a chemical reaction, the reactants react with each other to produce two or more products.
Single replacement reaction is also called single displacement reaction. An
uncombined element replaces another element part of compound, or when
one element displaces the other element in a compound.
A general reaction as: A + BC -> AB + C
For example: 2HCl (aq) + Zn(s) ZnCl₂(aq) + H₂(g)
(H replaces Zn)
Condition for the single replacement reactions:-
To identify a single replacement reaction easily, one more reactive element displaces another element from the compound. (Table J in reference tables)
A nonmetal can always displaces a non-metal and a metal displaces a metal.
Fill in the blanks
Interphase
Mitosis is now over
__________ is unwound.
Here the cell _________________its chromosomes in preparation for another round of cell division.
One complete ____________ is from one cell division to the next.
chromatin , grows , cell cycle .
What stage of the cell cycle do chromosomes copy in order to prepare for division?interphase
The cell then replicates its chromosomes during a crucial interphase stage known as the S phase and makes sure that its systems are prepared for cell division. The cell is now prepared to enter the first stage of mitosis, assuming all circumstances are ideal.
Mitosis is now over chromatin is unwound.
Here the cell grows its chromosomes in preparation for another round of cell division.
One complete cell cycle is from one cell division to the next.
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What is the concentration (M) of a KCl solution prepared by dissolving 82.4 g of KCl in sufficient water to give 450 mL of solution?
The molarity of KCl is 0.5 Molar when it is dissolved in 450 mL of water.
What is molarity?
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is its other name.
Given,
Weight of KCl (w) = 82.4 g
Volume of water (v)= 450 mL
We know that,
Molecular mass of KCl (W)= 74.5
Molarity = w/W × v/1000
= 82.4/74.5 × 450/1000
= 1.1 × 0.45
= 0.5 M
Therefore, the molarity of 82.4 g of KCl in 450 mL water is 0.5 M.
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:What is the name of the organic compound whose structural formula is shown here?A) EthaneB) EtheneC)PropeneD) Propane
We see that we have two carbon atoms. The nomenclature for two carbon atoms is Eth.
We also have a single bond between the two carbon atoms accompanied by hydrogens, so it is an alkane, so the name will be ethane.
The answer will be A) Ethane
Use the heat equation to calculate the energy, in joules, required to heat 10.0 g of silver (Ag) from
112 °C to 275 °C. (SH of silver=0.235 J/g C
Answer:
383 joules
Explanation:
Energy = mass * delta T * c
c=0.235
delta t = 275 - 112 = 163
mass = 10
10 * 163 * 0.235 = 383.05 joules = 383 joules.
I didn't include units because i'm too lazy to and the units cancel out to joules anyways but you should probably include units in your answer
what is the molarity of h3po4 solution if 0.05 M ba(oh)2 is needed to neutralize 20.00 ml of h3po4
The molarity of h3po4 solution if 0.05 M ba(oh)2 is needed to neutralize 20.00 ml of h3po4 is 0.25 M.
Given,
M₁ =?
valance factor H₃PO₄ (n)₁ = 3
M₂ = 0.05 M
V1 = V2 = 20 m or 0.02 L
valance factor Ba(OH)₂(n)₂ = 2
M₁n₁V₁ = M₂n₂V₂
M₁ = (M₂n₂V₂) / n₁V₁
= 0.05 × 2 × 3
= 0.25 M
Molarity is the number of moles of a substance in keeping with the liter of answer. solutions labeled with the molar awareness are denoted with a capital M; a 1. zero M answer incorporates 1 mole of solute according to the liter of answer. Molality is the variety of moles of solute in step with a kilogram of solvent.
Molarity (M) is the amount of a substance in a positive volume of solution. Molarity is described because the moles of a solute in step with liters of an answer. Molarity is also known as the molar attention of an answer.
Molarity is very crucial in chemistry for one big purpose. it's far the measurement of concentration in any mixture. The molarity of any solution is a way to know the unique factors or compounds which are found in any solution.
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Enter your answer in the provided box.
Calculate the following quantity: volume of 1.96 M calcium chloride that must be diluted with water to
prepare 761 mL of a 2.79 x 102 M chloride ion solution.
mL
The volume of a 1.96 M calcium chloride that must be diluted with water to prepare 761 mL of a 2.79 x 102 M chloride ion solution is 108,326.02mL.
How to calculate volume?The volume of a solution can be calculated using the following formula:
C₁V₁ = C₂V₂
Where;
C₁ = initial concentrationV₁ = initial volumeC₂ = final concentrationV₂ = final volumeAccording to this question, 1.96 M calcium chloride must be diluted with water to prepare 761 mL of a 2.79 x 10² M chloride ion solution. The initial volume can be calculated as follows:
1.96 × V = 279 × 761
1.96V = 212,319
V = 108,326.02mL
Therefore, 108,326.02mL is the volume of the solution.
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Liquid hexane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . If 6.36 g of water is produced from the reaction of 7.76 g of hexane and 41.9 of oxygen gas, calculate the percent yield of water.
Percent yield of water when 7.76g liquid hexane and 41.9 of oxygen reacts to form 6.36g of water is 84 %
Balanced equation for the reaction is
2 C₂H₁₄ + 19 O₂ ---> 12 CO₂ + 14 H₂O
1 mole of hexane = Given weight / molecular weight = 7.76 g x 1 mole / 130 g = 0.06 moles [Molecular mass of hexane = 130]
1 mole O₂ = 41.9 g x 1 mole / 32 g = 1.3 moles
Hydrogen is the limiting reactant in the reaction
Moles of H₂O = 0.06 moles H₂ x 14 H₂O / 2 CO₂ = 0.42 moles H₂O
Mass H₂O = 0.42 moles x 18 gm/mole = 7.56 g
Percent yield = (Actual yield / Theoretical yield) * 100 = (6.36 / 7.56) * 100 = 84 %
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A solution is made by mixing 228.0 mL of ethanol initially at 15.1 ∘C with 228.0 mL of water initially at 21.5 ∘C . What is the final temperature of the solution assuming that no heat is lost? The density of ethanol is 0.789 g/mL and the density of water is 1.00 g/mL . The specific heat of ethanol is 2.46 J/g·°C and the specific heat of water is 4.184 J/g·°C .
The final temperature of the solution assuming that no heat is lost 22.14°C.
The specific heat of a substance is the amount of heat required to raise the temperature of the unit mass (1 kg) of a substance by one degree.
As the beaker is insulated so the heat gain by ethanol will be equal to the heat lost by water.
Q = m c ΔT
The mass of the ethanol, m₁ = density × Volume = 0.789 × 45 = 35.5 g
The density and volume of water are 1.0 g/ml and 45 ml respectively.
The mass of the water, m₂ = density × Volume = 45 g
Heat gained by ethanol = Heat lost by water
m₁ × C₁× (T₂ - T₁) = - m₂ × C₂ ×(T₂ - T₁') ------------(1)
The initial temperature of ethanol, T₁ = 8° C
The initial temperature of the water, T'₁ = 28.6° C
The specific heat of ethanol, C₁ = 2.42J/(g⋅°C)
The specific heat of water, C₂ = 0.450 J/g°C
Substitute the values in the above-written equation (1)
35.5 × 2.42J/(g⋅°C × (T₂ - 8° C) = 45 × (4.184 J/g°C) ×(28.6°C - T₂)
T₂ - 8° C = 2.192 ×(28.6°C - T₂)
T₂ - 8° C = 62.68 - 2.192 T₂
3.192 T₂ = 70.68
T₂ = 22.14 °C
Hence, the final temperature of the mixture is equal to 22.14°C.
Learn more about specific heat here:-https://brainly.com/question/21406849
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If 88.0 g of CO2 is produced from the complete decomposition of calcium carbonate in 250 g of impure sample, what is the purity in terms of the carbonate content?
Now purity is the effective percentage of pure reactant in the total mass.
The rest is inert impurities.
They ask you to calculate the purity of the carbonate, so you have to focus on CaCO3
Let's calculate with the reaction:
CaCO3 (s) -----------------> CaO (s) + CO2 (g)
x 88.0 g
100 g CaCO3 ------- 44 g CO2
x ------- 88 g CO2
x = 200.16 g
Sample has 250 g of impurities. So:
Purity % = (200.16 g / 250 g impure) x 100 = 80.0 % of purity
Is steel, helium, carbon dioxide, tea,gold and olive oil a mixture or pure substance?
First, let's review the concepts of mixtures and pure substance:
A substance is matter that has a uniform and definite composition. All samples of substances, sometimes called pure substances, have identical properties. Substances may be either elements or pure compounds. They may also be solid, liquid, or gas.
A mixture is a mixture of several substances and you can identify them as homogeneous (only contains one phase) or heterogeneous (contains more than a phase).
- Steel is a mixture because is formed of various elements that are metals and it's a homogeneous mixture because you only see one phase.
- Helium is a pure substance because is an element as you can see in the periodic table (Helium is the second element of the table).
- Carbon dioxide is a compound. A compound is the result of a reaction as an example and compounds are pure substances, so carbon dioxide is a pure substance.
- Tea is a mixture because water and other soluble compounds like sugar are mixed. In this case, is a homogeneous mixture because you only see one phase.
- Gold is an element like helium, you can find it in the periodic table of elements too. It is the 79th element, so is a pure substance.
- Olive oil is a substance pure because it is a compound and remember that compounds are pure substances too because it contains various elements that are combined chemically.
How would you find the mass and volume of a solid?
Answer:
Figure out the volume by either measuring the dimensions of the solid or using a measuring jug for a liquid. Convert any units as needed to get a number in meters cubed.
Put the object or material on a scale to figure out its mass.
Divide the mass by the volume to figure out the density (p = m / v).
Explanation:
