Wednesday

February 22, 2017
Total # Posts: 10

**Chemistry**

What is the total heat evolved when a saturated solution of boric acid (H3BO3) in water is cooled from 100C to 20C? Note the specific heat capacity of the saturated solution is approximately that of water in that temperature range (4.20 J/g.K) and the specific heat capacity of...

*March 23, 2014*

**Chemistry**

Compound A is added into a calorimeter that contains 0.750 litres of water. If the dissolution of 5.0 g of this compound causes the temperature of the water to rise to 45.0 °C, what is the enthalpy of solution of compound A?

*October 9, 2012*

**Chemistry**

Compound A is added into a calorimeter that contains 0.750 litres of water. If the dissolution of 5.0 g of this compound causes the temperature of the water to rise to 45.0 °C, what is the enthalpy of solution of compound A?

*October 9, 2012*

**physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 25.9° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.3 kg, and the coefficient of kinetic friction...

*January 30, 2012*

**physics**

A 250g aluminum cup holds and is in thermal equilibrium with 850g of water at 83 degrees celcuis. The combination of cup and water is cooled uniformly so that the temperature decreases by 1.5 degrees celcuis per minute. At what rate is energy being removed?

*September 2, 2011*

**english**

these are a few of the sentences that I have to make into simple or complex sentences: I love snow days. I like to sleep in. I like to stay in my pajamas all day. I like not having to rush around getting ready for school. I like to watch TV all morning. I like to eat when i ...

*January 13, 2011*

**english**

I have a bunch of sentences that I need to change and make them into simple and complex sentences. Can you help so that i know i am doing it right?

*January 13, 2011*

**math**

Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of x that are greater than 1, three values...

*September 10, 2010*

**algebra**

Evaluate the logarithmic equation for three values of x that are greater than -1, three values of x that are between -2 and -1, and at x = -1. Show your work. Use the resulting ordered pairs to plot the graph; submit the graph via the Dropbox. State the equation of the line ...

*September 8, 2010*

**chemistry**

how to measure the volume of wood chips? (will they float on water re: water displacement, so this would not be a good method to do it)

*November 3, 2009*

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