04/20/21

Marvin bought a 1965 Ford Mustang for $8,000. After he purchased the car, its value increases by 5% per year.
Marvin bought a 1965 Ford Mustang for $8,000. After he purchased the car, its value increases by 5% per year.  a. Write an equation to find the value, y, of the car, x years after it was... more
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04/20/21

Can you answer this math question please

Suppose the temperature in degrees Celsius over a 10-hour period is given by T(t) = -t^2 + 2t + 33 a) Find the average temperature. b) Find the minimum temperature. c) Find the maximum temperature.
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04/20/21

Here is another!
Write the unbalanced chemical equation on a piece of paper.  Draw the particulate representation to help you balance the overall equation.  Insert your drawing in the green box. Write the correct... more
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04/20/21

Hi all I need help!
Determine the indicated mole ratio using the balanced equation below:2 Fe2O3 + 3 C → 4 Fe + 3 CO2 ____moles Fe2O3 : ___moles CO2If you started this reaction with 7.7 moles of Fe2O3, how many moles... more
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04/20/21

how to write reaction with conjugate base?
How do I write this reaction?I know the conjugate base of H2CO3 is HCO3- but when I do H2CO3 + H2O it doesn't give me that conjugate base? How do I do this? I need to write the equation to find the... more
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04/20/21

Titrating a weak acid
An unknown acid has an [A-]/[HA] ratio of 0.2 at pH 3.49. Use the Henderson-Hasselbalch equation to calculate the pKa of the unknown acid. Use a list of weak acids to suggest possible identities of... more
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04/20/21

4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g), How many grams of ammonia will be required to produce 12.0 g of water?
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04/20/21

N2(g) + H2(g) → NH3(g) If you started with 2.5 g of N2 and 4.5 g of H2, how many grams of NH3 will you make?
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04/20/21

why is it harder to determine experimentally the pka and ka of Hcl?

in class, we experimentally recorded pH vs volume of base added to find the equivalence pt and therefore, pka. a question asks why we didnt experimentally derive a strong base/strong acid (HCl).... more
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04/20/21

Whats the number of moles of H2O(g) in a 12 liter container at stp
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04/19/21

monica has 17 coins in her change purse worth $3.05 if she only has quarters and nickels, how many each does she have?
show all work and answer with substitution or elimanation
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04/19/21

What is the mass of this object?
when a constant force is applied to an object, the acceleration of the object varies inversely with its mass. when a certain constant force acts upon an object with mass 18 kg, the acceleration of... more
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04/19/21

2 Na2S2O3 + AgBr NaBr + Na3[Ag(S2O3)2] What is the mass of NaBr that will be produced from 20.5 moles of Na2S2O3?
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04/18/21

Calculate the [H+] and the [OH−] of a solution with a pH=8.37 at 25 °C
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04/18/21

12-x/-4 - What would the answer to this be?
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04/18/21

Change the equation y+3=2^x so that the graph of the new equation has no x-intercepts.
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04/18/21

Heat Energy to Specific Heat
In the laboratory a student finds that it takes 155 Joules to increase the temperature of 11.0 grams of gaseous oxygen from 22.6 to 39.0 degrees Celsius.The specific heat of oxygen calculated from... more
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04/18/21

Heat Energy to Specific Heat
In the laboratory a student finds that it takes 77.4 Joules to increase the temperature of 14.1 grams of solid copper from 24.6 to 39.9 degrees Celsius.The specific heat of copper calculated from... more
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04/18/21

How much energy does it take to vaporize water at the temperature of boiling?
Given that the heat of vaporization of water is 2256.4 kJ/kg, how much energy (kJ) does it take to vaporize 200.0 g of water that is already at the temperature of boiling.
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04/18/21

What is the pH of an aqueous solution with a hydrogen ion concentration of [H+] = 2.3 x 10^-9 M?
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04/18/21

calculate the hydroxide ion concentration,[OH-], for a solution with a pH of 11.43
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04/18/21

PLSSSSSSSSSS HELPPPPPPPPPPPPPPPPP
How much heat is needed to raise the temperature of 122.5 g of water by 14.0°C? Please provide your final answer rounded to two decimal places and provide the proper units, in their respective... more
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04/18/21

PLS HELPPPPPPPPPPPPPPPPP
What mass of water can be heated from 3.1°C to 34.6°C by the addition of 3,851.2 of energy? Please provide your final answer rounded to two decimal places and provide the proper units, in their... more
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04/18/21

Find the area in square inches of the figure shown.
Find the area in square inches of the figure shown.8 in.17 in.39 in.36 in.A four-sided figure is formed from two right triangles that share a leg, shown by a dashed line segment. The unshared leg... more
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04/18/21

u = 2i - 5j and v = -i + 3j, determine -6u - 3v.
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