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A rectangle is 4cm longer than it is wide. If the length and width are both decreased by 2cm, the area is decreased by 24 cm sq. What are the dimensions of the original rectangle?

A rectangular fish pond is 7ft longer than it is wide. A wooden walkway 1ft wide is placed around the pond. The area covered by the pond and walkway is 58 square feet greater than the area covered by the pond alone. What are the dimensions of the pond?

I was holding my puppy in my lap as I sat at the kitchen table because I was trying to get a better look at something in her eye. When I went to get the stuff from her eye she wriggled out of my hand really fast and fell to the floor. She immediately began yelping but after a minute I was able to console her. She's only 8 weeks old but when I put her down shes walking and acting fine and I gave her some treats to make sure she will eat. I am just scared she has a concussion or something. Her vet visit is not until tomorrow morning...What do I do?!

Anthropology asks 2 questions about the context of the proposed behavior in an ethnographic report to help determine its probable accuracy. One question addresses the culture and the other addresses the environment. What 2 questions are they?

I am confused on how to explain the difference between the two and why sociology is not a branch of anthropology

Determine the values of Kp that correspond to the following values of Kc.

CO(g) + Cl2(g) COCl2(g), Kc = 1.2 103 at 668 K

2 NO(g) + Br2(g) 2 NOBr(g), Kc = 1.32 10-2 at 1000 K

2 COF2(g) CO2(g) + CF4(g), Kc = 2.00 at 1000°C

For the reaction SO3(g) SO2(g) + 1/2 O2(g), Kc = 16.7 at 1000 K. What is the value of Kc at 1000 K for the reaction, 2 SO2(g) + O2(g) 2 SO3(g)?

The half-life for the first-order decomposition of sulfuryl chloride at 320°C is 8.75 h.

SO2Cl2(g) SO2(g) + Cl2(g)

What is the value of the rate constant k, in s-1?

What is the pressure of sulfuryl chloride 4.12 h after the start of the reaction, if its initial pressure is 722mm Hg?

How long after the start of the reaction will it be before the pressure of sulfuryl chloride becomes 278 mm Hg?

Many gaseous reactions occur in your car engine and the exhaust system. One of them is:

NO2 (g) + CO (g) NO (g) + CO2 (g)

The following initial rate data is available for this reaction.

EXPERIMENT [NO2](mol/L) [CO] (mol/L) Initial Rate, mol/L-s

1 0.10 0.10 0.0050

2 0.40 0.10 0.080

3 0.10 0.20 0.0050

a) The order of the reaction with respect to the NO2.

b) The order of the reaction with respect to the CO.

c) The overall order of the reaction.

d) The value of the rate constant.

A rule of thumb in chemical kinetics states that for many reactions, the rate of reaction approximately doubles for a temperature rise of 10°C. What must be the activation energy of a reaction if the rate is indeed found to double between 25°C and 35°C?

Use a value of k = 3.66 10-3 s-1 to establish the instantaneous rate of the first-order decomposition of 2.25 M H2O2(aq).

In the reaction H2O2(aq) H2O(l) + 1/2 O2(g), the initial concentration of H2O2 is 0.2540 M, and the initial rate of reaction is 9.32 10-4 M s-1. What will be [H2O2] at t = 33 s?

Which of the two solutions, a 0.1 m aqueous solution of glucose (molar mass 180 g/mol) or a 0.1 m aqueous solution of sucrose (molar mass 342 g/mol), will have a lower freezing point? Why?

is sodium carbonate, barium sulfate, or naphthalene solubile in cyclohexane? why?

At a certain temperature, the root mean-square speed of CH4 molecules is 1705 km/h. What is the root mean-square of CO2 molecules at the same temperature?

Calculate the molecular mass of a liquid that when vaporized at 91°C and 740 Torr gave 140 mL of vapor with a mass of 0.775 g.

Some of the best laboratory vacuum systems can pump down to as few as 1.2 X 10^9 molecules per cubic meter of gas. Calculate the corresponding pressure, in atmospheres, assuming a temperature of 24°C.

Calculate the height, in meters, of a column of CCl4(l) (d = 1.59 g/mL) that exerts the same pressure as a 28.0 cm column of Hg(l).