Which conclusion is supported by the information in the graph?
Timed!!! 56 minutes left!!!!
The cost of producing a kilowatt of power with a fuel cell will be less than $30 in 2015.
Fuel cell cars are unlikely to be affordable in the near future.
The rate of emissions is decreasing because of inexpensive fuel cell technology.
The environment is unlikely to improve as a result of cheap fuel cell technology.
Answers
Answer:
A. The cost of producing a kilowatt of power with fuel cell will be less than $30 in 2015
Related Questions
What is the mass of 22.4 L of Cl2 at STP? (5 points) a 35.45 grams b 70.9 grams c 22.4 grams d 28.01 grams
Answers
Answer: 70.9 grams
Explanation:
22.4 L is about 1 mole, meaning that we need to find the mass of 1 mole of chlorine gas, which is about 70.9 grams.
paragraph about what has caused co2 levels to rise / will give brainliest
Answers
Answer: We may only emit about 4% of total emissions, while the natural environment emits the other 96%. But the thing is the natural environment adds and takes out CO2 from the system in roughly equal amounts (at least in the short and medium term). We only add it. We are adding so much of it that the environment can only absorb about half of it, thus the rapid increase in CO2 levels, thus the rapid increase in temperatures.
Explanation:
Which substance is a mixture of two or more metals?.
Answers
The substance which is mixture of two or more than two metals is called as alloy. Alloy is metallic mixture of any elements.
What is alloy ?Alloy is the mixture of two or more than two metal . This mixture may be homogenous or heterogenous ,in both of the phase alloy mixture occur. It may be solid or mixture of many phases.
Alloy are classified into two parts i.e. substitutional alloy and interstitial alloy. An example of alloy is red gold which is the mixture of copper and gold. and there is mixture of silver and gold to make an alloy.
There are different types of alloy present in environment like nickel alloy, zinc alloy, bronze alloy , stainless steel alloy. I an alloy contain ferrous metal it will be rust.
Thus, Alloy is the mixture of two or more than two elements.
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Two popular antacids tablets are tums and maalox. the active ingredient in both of these anttacids is calcium carbonate, caco3. tums regular strength tablets contain 0. 747 g and maaloz tablets contain 0. 600 g of calcium carbonate. compare the number of formula units of calcium carbonate in both tums and maalox
Answers
The number of formula units of CaCO₃ in Tums is 1.25 times the formula units in Maalox
Avogadro's hypothesis1 mole of CaCO₃ = 6.02×10²³ formula units
But
1 mole of CaCO₃ = 100 g
Thus,
100 g of CaCO₃ = 6.02×10²³ formula units
How to determine the number of formula units in both tabletsFor Tums
100 g of CaCO₃ = 6.02×10²³ formula units
Therefore,
0.747 g of CaCO₃ = (0.747 × 6.02×10²³) / 100
0.747 g of CaCO₃ = 4.50×10²¹ formula units
For Maalox
100 g of CaCO₃ = 6.02×10²³ formula units
Therefore,
0.6 g of CaCO₃ = (0.6 × 6.02×10²³) / 100
0.6 g of CaCO₃ = 3.61×10²¹ formula units
ComparisonFormula units in tums = 4.50×10²¹ formula unitsFormula units in maalox = 3.61×10²¹ formula unitsComparison =?Comparison = Tums / Maalox
Tums / Maalox = 4.50×10²¹ / 3.61×10²¹
Tums / Maalox = 1.25
Cross multiply
Tums = 1.25 × Maalox
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How many ions are there in 13grms of K+ ions (k=39,L=6.0by10 raised to power23
Answers
Answer:
1) k2O = 2K(1+) + O(2-)This is, every molecule of K2O
Explanation:
hope this helps if not let me know have a blessed day
Can someone help me with my chemistry problem?
Answers
Answer:
D. 108g of water
Explanation:
16g CH4 produces 2(18)g of H20
1g CH4 produces [tex]\frac{36}{16}[/tex]g of H2O
48g CH4 produces [tex]\frac{36}{16}[/tex]×48
108g of H20
Answer:
D. 108g of water
Explanation:
Name these compounds according to IUPAC.
Answers
The IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.
What is IUPAC name?International Union of Pure and Applied Chemistry, IUPAC, is naming of the organic compound by the rules of chemistry.
There are some rules, like identifying the functional group, to find the longest carbon chain.
Thus, the IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.
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What does an embryo do in a seed
Answers
Answer:
The embryo, endosperm, and seed coat are the three major parts of a seed. An embryo is the young multicellular organism formed before it emerges from the seed. A seed is an embryonic plant, which stores food and is enclosed in a protective outer covering, which give rise to a new plant.
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Determine the electronegativity difference (AEN) and the type of bond formed
(ionic, polar, non-polar).
BaCl2
Nyour answer
Answers
the electronegativity difference (AEN):
<0.5: covalent (non polar)
0.5- 1.7: covalent (polar)
> 1.7 : ionic
BaCl₂
Ba = 0.9
Cl = 3
Cl - B = 3 - 0.9 = 2.1 (ionic)
Which of these best describes electrolysis?
A. another name for all chemical reactions
B. a term that refers to the division of hydrogen and oxygen atoms
C. a reaction that occurs when an electric current passes through water
D. a reaction that occurs any time an electric current is introduced to a solid
Answers
Answer:
c
Explanation:
chemical decomposition produced by passing an electric current through a liquid or solution containing ions.
2S+3O2=2SO3. If 4moles of sulfur reacts with 9. 5 moles of oxygen, how many moles of oxygen would remain after the reaction?
Answers
Answer: 3.5 moles
Explanation:
For every 2 moles of sulfur consumed, there are 3 moles of oxygen consumed.
This means that sulfur is the limiting reactant, meaning that 2(3)=6 moles of oxygen will be consumed.
Thus, 9.5-6=3.5 moles of oxygen will remain.
Why did the United States cut off trade and diplomatic relations with Cuba?
Answers
Answer:
It was retaliation for the nationalization of U.S. corporations property by Cuba.
Explanation:
Answer:
Cuba created a communist government and a dictatorship made by Fidel Castro. USA obviously did not approve of this so they responded by severing trade and diplomatic relations with Cuba.
Make a comparison between all five states of matter
Class 9
Answers
Answer:
States of Matter
Solid has fixed volume.
Solid has fixed shape.
Solid has high density.
Solids are heavy.
Solid does not flow.
When different parts of the oceans are heated unevenly this causes the water to?
Answers
Answer:
move in convection currents
Explanation:
When different parts of the oceans are heated unevenly this causes the water to move in convection currents.
The molar mass of kcl is 74.55 g/mol. if 8.45 g kcl are dissolved in 0.750 l of solution, what is the molarity of the solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.113 m 0.151 m 6.62 m 11.3 m
Answers
Answer: 0.151 M
Explanation:
We first need to convert the amount of KCl into moles. This is 8.45/74.55 = 0.113 moles.
So, the molarity is 0.113/0.750 = 0.151 M
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An experiment requires a solution that is 80% ethyl alcohol by volume. What volume of ethyl alcohol should be added to 400 mL of water to make this solution?
Answers
Answer: 800 mL of methyl alcohol should be added to 200 ml of water to make this solution.
Explanation:
Volume of the methyl alcohol = x
Volume of water = y = 200 mL
Volume of the solution ,V = x + y
Volume percentage of solution = 80%
x = 800 mL
800 mL of methyl alcohol should be added to 200 ml of water to make this solution.
Diethyl ether has a δhvap of 29. 1 kj/mol and a vapor pressure of 0. 703 atm at 25. 0°c. What is its vapor pressure at 76. 0°c?
Answers
The heat of vaporization is the heat required to turn 1 gm solid into a liquid. The vapor pressure of diethyl ether at 76 degrees celsius is 1.95 atm.
What is vapor pressure?Vapour pressure is the pressure exerted by the vapors of the equilibrium system. Clausius-Clapeyron equation is used to find the vapor pressure.
[tex]\rm ln \dfrac{P_{2}}{P_{1}} = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})[/tex]
Given,
Initial pressure = 0. 703 atm
Initial temperature = 298K
Final temperature = 349 K
Change in enthalpy of vaporization = 29100J/mol
Boltzman constant = 8.314 J/K mol
Substituting values above:
[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{P_{1}} & = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})\\\\&= \dfrac{9100}{8.314}(0.0004903)\\\\&= 0.5363\end{aligned}[/tex]
Solving further,
[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{0.703} &= 0.5363\\\\& = \rm e^{0.5363}\\\\&= 1.70\end{aligned}[/tex]
The final pressure is calculated as:
[tex]\rm P_{2} = (0.703 atm)(1.70) = 1.95\;\rm atm[/tex]
Therefore, the vapor pressure at 76 degrees celsius is 1.95 atm.
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what is the best definition of weight
Answers
pls help AHHHHHHHHHHHH
Answers
Answer:
1 Zn + 2 HCl ⇒ 1 H₂ + 1 ZnCl₂
Hope this helps!!!
What is the function of the seed in the plant? can’t copy and paste what the internet has
Answers
Answer:
Seed is the actual medium of reproduction in plants. It could be considered as the result of gametic stage of reproduction producing the basic and fundamental prototype of the parent plant called embryo covered inside a hard protective coat I.e. testa
I read this in 6th std
where do most of the elements on the periodic table come from?
Answers
Stars
All the elements on earth have been cooked from billions of years in stars and the released in the universe through super-nova explosions
Braconid wasps lay eggs on the tomato hornworm caterpillar's body. The larvae that hatch from the eggs start feeding on the tissue of the caterpillar. What type of ecological relationship do both the organisms share?
Answers
Answer:
Braconid wasps lay eggs on the tomato hornworm caterpillar's body. The larvae that hatch from the eggs start feeding on the tissue of the caterpillar. What type of ecological relationship do both the organisms share?
Which statement is true based on the diagram?
A.sulfate ions will move from right to left through the salt bridge
B.sulfate ions will move from left to right through the wire
C.sulfate ions will move from left to right through the salt bridge
D.sulfate ions will move from right to left through the wire
Answers
Sulfate ions will move from left to right through the salt bridge. The salt bridge allows the passage of ions between solutions.
What is an electrochemical cell?An electrochemical cell is a cell where electrical energy is produced as a result of chemical reactions.
We have to note that the anions tend to move from the cathode to the anode hence, sulfate ions will move from left to right through the salt bridge.
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Most lakes have rivers flowing out of them, carrying water to the ocean. However, some lakes, including the Great Salt Lake and the Dead Sea, have no outlet. Water flowing into these lakes leaves only through evaporation. Considering that the water flowing into the lakes contains many dissolved substances, how does the lack of an outlet affect the composition of these lakes? What would you expect to happen after many more years of inflow and evaporation?
Answers
The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.
What is a lake?Lake is a small stream of running water or a channel for water.
Lakes are usually a standing body of water or slow moving. This means that some lakes, including the Great Salt Lake and the Dead Sea, have no outlet.
The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.
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What is [tex]K_c[/tex] for the following equilibrium concentration of each substance is :
[tex]2SO_2(g)+O_2\rightleftharpoons2SO_3(g)[/tex]
Answers
As per the question ,
[tex]2SO_2(g)+O_2\rightleftharpoons2SO_3(g) [/tex] (given)
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex]K_c = \frac{[SO_3]^2}{[SO_2]^2[O_2]}[/tex]
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex] \: \: \: \: \: = \frac{ ( 1.9)^2M^2}{(0.6)^2(0.82)M^3} [/tex]
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex] \: \: \: \: = 12.229 M^{ - 1}[/tex] (approximately)
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
Hence , K for the equilibrium is [tex]12.229M^{-1}[/tex]
For the molecule c3h9n, draw a structural formula and its lewis dot structure
Answers
For the molecule propylamine, structural formula and its Lewis dot structure is attached below in image.
What is Lewis dot structure?Lewis structures, or electron dot structures, are diagrams that show how electrons are shared and distributed around atoms. Lone pairs are electrons that belong to a single atom and are represented by dots.
In normal structural formula of propylamine only bonds are showing and in Lewis dot structure with bonds number of lone pair of electrons or charge present on any atom is also showed. Each single bond present in the structure is formed by the sharing of 2 electrons and it is shown in the attached image.
Hence structural formula and Lewis dot structure is attached in the image.
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Aeronautical researchers have developed three different processes to pack a parachute. They want to compare the different processes in terms of time to deploy and reliability. There are 1,200 objects that they can drop with a parachute from a plane. Using a table of random digits, the researchers will randomly place the 1,200 items into three equally sized treatment groups suitable for comparison.
Which design is the most appropriate for this experiment?
Randomly number each item with 1, 2, or 3. Assign the items labeled 1 to the process 1 group, assign the items labeled 2 to the process 2 group, and assign the items labeled 3 to the process 3 group.
Number each item from 1 to 1,200. Reading from left to right from a table of random digits, identify 800 unique numbers from 1 to 1,200. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Number each item from 0000 to 1199. Reading from left to right on a random number table, identify 800 unique four-digit numbers from 0000 to 1199. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Select an item, and identify the first digit reading from left to right on a random number table. If the first digit is a 1, 2, or 3, assign the item to the process 1 group. If the first digit is a 4, 5, or 6, assign the item to the process 2 group. If the first digit is a 7, 8, or 9, assign the item to the process 3 group. If the first digit is a 0, skip that digit and move to the next one to assign the item to a group. Repeat this process for each item.
Answers
The best design for this experiment is to number the items from 1 to 1,200 and then choose random numbers in the table of random digits (second option).
How to use a table of random digits?These tables are used to randomly assign items or subjects into groups when experimenting. The best way to use these tables are:
Give each item or participant a number.Take a lot at the table and choose a number.If this number is the same that the number assigned to an item or participant classify it in the first group.Keep selecting.Based on this, for this experiment the steps are:
Number the items from 1 to 1,200. Identify numvers in the table.Assign the first 400 items to the process 1 group. Repeat the process for the other two groups.Learn more about experiments in: https://brainly.com/question/11256472
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Answer:
b. Number each item from 1 to 1,200. Reading from left to right from a table of random digits, identify 800 unique numbers from 1 to 1,200. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Explanation:
Statistics A edg. 2023
16. What part of the atom does radioactivity involve?
O Outer energy shells
Nucleus
O Entire atom
Inner energy shells
Answers
Answer:
inner energy shells are involved in radioactive activity
Answer: I think its NUCLEUS
Explanation: Good luck yall
What are the formulas to go back and forth from concentration to pH?
Answers
Answer:
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].
Explanation:
A stock solution is made by dissolving 66.05 g of (nh4)2so4 in enough water to make 250 ml of solution. a 10.0 ml sample of this solution is then diluted to 50.0 ml. given that the molar mass of (nh4)2so4 is 132.1 g/mol, what is the concentration of the new solution? use m subscript i v subscript i equals m subscript f v subscript f. and molarity equals startfraction moles of solute over liters of solution endfraction.. 0.400 m 1.60 m 5.00 m 10.0 m
Answers
The concentration of the new solution of the ammonium sulphate, (NH₄)₂SO₄ given the data is 0.4 M
How to determine the mole of (NH₄)₂SO₄Mass of (NH₄)₂SO₄ = 66.05 gMolar mass of (NH₄)₂SO₄ = 132.1 g/mol Mole of (NH₄)₂SO₄ =?Mole = mass / molar mass
Mole of (NH₄)₂SO₄ = 66.05 / 132.1
Mole of (NH₄)₂SO₄ = 0.5 mole
How to determine the molarity of (NH₄)₂SO₄Mole of (NH₄)₂SO₄ = 0.5 mole Volume = 250 mL = 250 / 1000 = 0.25 L Molarity of (NH₄)₂SO₄ =?Molarity = mole / Volume
Molarity of (NH₄)₂SO₄ = 0.5 / 0.25
Molarity of (NH₄)₂SO₄ = 2 M
How to determine the molarity of the diluted solution Volume of stock solution (V₁) = 10 mL Molarity of stock solution (M₁) = 2 MVolume of diluted solution (V₂) = 50 mLMolarity of diluted solution (M₂) =?M₁V₁ = M₂V₂
2 × 10 = M₂ × 50
20 = V₂ × 50
Divide both side by 50
M₂ = 20 / 50
M₂ = 0.4 M
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Answer:
A: 0.400 M
Explanation:
