11/15/21

Wavelengths for organic chemistry

The equipment used for aviation communications emits high‑frequency radiowave energy with a wavelength of 0.250 km. What is the energy of exactly one photon of this radiowave radiation?E=What is... more
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11/11/21

Logarithums!!!!
A $5000 investment earns 8.4% annual interest, and a $9000 investment earns 6.3%, both compounded annually. How long will it take for the smaller investment to catch up to the larger one?Enter your... more
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11/10/21

determining a volume of a base
A chemistry student weighs out 0.131g of acetic acid (HCH3CO2) into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1100... more
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11/10/21

For the reaction below identify the oxidizing agent and the reducing agent. Use the oxidation method. Show all work!
For the reaction below identify the oxidizing agent and the reducing agent. Use the oxidation method. Show all work!
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11/08/21

45.0 g of CaCl are dissolved in enough water so that the molarity of the solution is 1.15 M. What is the volume in mL of the solution?
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11/03/21

Your gym membership costs $27.65 per month after an initial membership fee. You paid a total of $179.13 after 6 months.

A. Write an equation that gives you the total cost,y, related to the number of months,x, of your gym membership. B. Find the total cost after 9 months.
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11/03/21

1. Use the five flasks above to answer the questions that follow (description)
a. which flask do the molecules have the greatest average speed of the particles. Explain your answer.b. which nitrogen flask has the most number of particles? explain your reasoningc. which oxygen... more
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11/03/21

Write an equation in slope-intercept form.
passing through: (2,0) and (4,4)
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11/03/21

Given the thermochemical equations
X2+3Y2⟶2XY3Δ𝐻1=−370 kJX2+2Z2⟶2XZ2Δ𝐻2=−120 kJ2Y2+Z2⟶2Y2ZΔ𝐻3=−270 kJCalculate the change in enthalpy for the reaction.4XY3+7Z2⟶6Y2Z+4XZ2
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11/01/21

Solving a word problem using a quadratic quadratic with rational root

The area of a rectangle is 27 yd2 and the length of the rectangle is 3 yd less than double the width find the dimensions of the rectangle
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10/31/21

Two planes leave the same airport. The first plane leaves at 4.45 pm and averages 484 mph at a bearing of S61°E. The second plane leaves at 5.00 pm and averages 428 mph at a bearing of N19°W.
a) How far apart are the planes at 6.15 pm?b) What is the bearing from the first plane to the second plane at that time?
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10/31/21

A fishing boat leaves a marina and follows a course of S65°W at 8 knots for 15min. Then the boat changes to a new course of S36°W at 5 knots for 2hr.

a) How far is the boat from the marina? b) What bearing/course should the boat follow to return straight to the marina?
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10/28/21

Which has more kinetic energy: a 0.0016-kg bullet traveling at 398 m/s or a 5.9 107-kg ocean liner traveling at 14 m/s (27 knots)?

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10/27/21

What volume of natural gas is needed to boil the water

Suppose a boil water notice is sent out advising all residents in the area to boil their water before drinking it or using it for cooking. You need to boil 16.0L of water using your natural gas... more
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10/26/21

Chemistry Homework
Carbon monoxide reacts with oxygen gas to form CO2, as shown by the balanced equation below. A reaction vessel contains 2.700 g of CO and 2.700 g of O2.How many moles of CO and O2 do these masses... more
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10/26/21

Heat absorbed and enthalpy
A generic solid, X, has a molar mass of 58.8 g/mol. In a constant‑pressure calorimeter, 18.0 g of X is dissolved in 377 g of water at 23.00 °C.The temperature of the resulting solution rises... more
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09/30/20

IB Chemistry HL: Topic 11.1 (Uncertainties)

If x = 749 ± 5 and y = 34.8 ± 0.7, which one of the following will have the greatest percentage uncertainty?A. x + yB. x - yC. x/yD. x√yTrying to convince my teacher that it is A, otherwise I will... more
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