Answer:
a. qrxn = 831 J
b. 863 J
Explanation:
we know that density is the mass of a substance per unit volume
d=mass/volume
the volume of the solution is the combination of solution A and solution B
1.02 g/mL=mass/(25+25)
mass=50*1.02
mass=51g
Recall that Q=mCdT
mass=m, C=specific heat capacity
dT=change in temperature
qrxn = (51 g)(4.18 J/g⋅°C)(25.3 °C - 21.4 °C)
qrxn = 831 J
2.Heat=Heat capacity *change in temperature
qcal = (8.20 J/°C)((25.3 °C - 21.4 °C)
qcal = 31.98 J
qrxni + qcal = qrxn
qrxn = 831 J + 32.0 J
863 J------Heat of reaction
863 J =(51 g)(Heat Capacity)(25.3 °C - 21.4 °C)
4.34 J/g⋅°C
Which of the following statements is true?
A. The student chose the wrong tile to solve the problem.
B. The student chose the correct tile, but needs to flip the tile to make the units cancel.
C. The student chose the correct tile, but needs to add a second tile to solve the problem.
D. There is nothing wrong. The problem is ready to be solved.
The student selected the correct tile for the problem and doesn't need to flip the tile or add another tile. The problem is ready to be solved using the chosen tile. selected the correct tile for the problem and doesn't need to flip the tile or add another tile. The problem is ready to be solved using the chosen tile.
The correct answer is option D.
The student seems to be using a tile with the following information: "1.293 metric ton + 1000 kilograms/1 metric ton" to convert the mass of the container from metric tons to grams. Given that 1 metric ton is equivalent to 1000 kilograms, this tile can be used to perform the conversion. The problem statement provides the mass of the container as 1.293 metric tons, and the student wants to find the mass in grams.
A. The student chose the wrong tile to solve the problem.
This option is not correct. The tile selected by the student is appropriate for the given problem since it allows for the conversion of metric tons to kilograms, which is a necessary step to eventually convert to grams.
B. The student chose the correct tile but needs to flip the tile to make the units cancel.
This is not the case. The tile is already set up to correctly convert from metric tons to kilograms, and subsequently to grams. There is no need to flip the tile; it is correctly oriented for the given problem.
C. The student chose the correct tile but needs to add a second tile to solve the problem.
This is not necessary either. The single tile provided by the student allows for the complete conversion from metric tons to grams.
D. There is nothing wrong. The problem is ready to be solved.
This is the correct choice. The student's tile choice is appropriate, and no additional tile is required. They can proceed to solve the problem by multiplying the given mass of the container (1.293 metric tons) by the conversion factor on the tile (1000 kilograms/1 metric ton) to obtain the mass of the container in grams.
Therefore , from the given options the correct one is D.
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The question probable may be:
A student is trying to solve the following problem by selecting the tile shown. A container has a mass of 1.293 metric tons What is the mass of the container in grams? 1.293 metric ton + 1000 kilograms/ 1 metric ton Which of the following statements is true? A. The student chose the wrong tile to solve the problem. B. The student chose the correct tile, but needs to flip the tile to make the units cancel. The student chose the correct tile,but needs to add a second tile to solve the problem D. There is nothing wrong. The problem is ready to be solved.
B. solution level
C. solubility level
D. saturation level
Answer:
The arrow means "yield" or "react to form".
Explanation: The arrow means "yield" or "react to form".
You and your team work at Southern Nevada Water Authority and have been given the job of managing fluoride levels for the municipal water system. Today, you will need to measure the mass of the mineral sample fluorite (chemically, CaF2). Use this sample to determine how much water must be added to yield a 1 ppm fluoride solution. Your supervisor is requesting tanker trucks to bring the excess water. He needs to know how many tanker trucks to request and the total cost.
Notes: 1 mol CaF2 = 78.08 g CaF2 = 6.02 x 1023 molecules of CaF2
1 molecules of CaF2 = 2 atoms of F
1 mol H2O = 18 g H2O Density of water is 1 g/mL
1000 mL = 1 L and 3.78 L = 1 gallon
mass of sample of CaF2 = 287.185 g
1 part per million = 1 atom of fluorine per 999,999 water molecules.
1 truck can carry 12,800 litters of water at a cost of $2,852.42 dollars.
Before you begin mixing a solution of fluorite and water your team must first calculate the amount of water you will need. Your team will create a presentation that will show all of the necessary calculations to ensure that the greater Las Vegas area will have cavity free teeth. The presentation should include the following information:
- Draw a diagram that points out the basic design of the water system and transport.
- Demonstrate the following calculations
(a) Calculate how many moles of mineral fluorite (CaF2) are in you sample.
(b) Calculate the number of fluorine atoms in the sample of the mineral fluorite (CaF2).
(b) Calculate how many molecules of water you will need.
(c) Calculate the number of gallons of water that are needed to dissolve a 287.185 gram sample of fluorite to yield 1ppm solution.
(e) How many trucks will be needed? Show your calculations!
(f) what is will be the total cost?
- Bonus points for creativity or “WOW” factor (i.e. pictures, color, neatness)!
I AGREE WITH bmstanley19
An oxidation reaction involves the loss of electrons or an increase in the oxidation state of an element. Options B, C, and D represent oxidation reactions, while option A does not.
Let's analyze the given options:
A. AuCl₄⁻ → AuCl₂⁻
In this reaction, the gold atom goes from a +3 oxidation state (AuCl₄⁻) to a +1 oxidation state (AuCl₂⁻). This means the gold atom gains two electrons, indicating a reduction rather than oxidation. Therefore, option A is not an oxidation reaction.
B. Mn⁷⁺ → Mn²⁺
In this reaction, the manganese atom goes from a +7 oxidation state to a +2 oxidation state. This indicates a decrease in the oxidation state, which means the manganese atom gains electrons. Therefore, option B represents an oxidation reaction.
C. Co³⁺ → Co²⁺
In this reaction, the cobalt atom goes from a +3 oxidation state to a +2 oxidation state. Similar to option B, this indicates a decrease in the oxidation state, representing an oxidation reaction.
D. Cl₂ → ClO₃⁻
In this reaction, the chlorine molecule (Cl₂) is converted to a chlorate ion (ClO₃⁻). Here, the chlorine atom undergoes an increase in oxidation state, changing from an oxidation state of 0 in Cl₂ to an oxidation state of +5 in ClO₃⁻. This indicates the loss of electrons by chlorine, making option D an oxidation reaction.
Therefore, options B, C, and D represent oxidation reactions, while option A does not.
Learn more about oxidation reaction from the link given below.
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Answer:
inbreeding
Explanation: