# Joe Schmo

Most popular questions and responses by Joe Schmo
1. ## Chemistry

Given that the specific heat capacities of ice and steam are 2.06 J/g degrees C and 2.03 J/g degrees C, respectively, calculate the total quantity of heat evolved when 10.0 g of steam at 200 degrees C is condensed, cooled, and frozen to ice at -50 degrees

2. ## Chemistry

In the CO3^2- ion, all three C-O bonds have identical bond lengths of 136 pm. Why?

3. ## Chemistry

Although water and ammonia differ in molar mass by only one unit, the boiling point of water is over 100 degrees C higher than that of ammonia. What forces in liquid water that do not exist in liquid ammonia could account for this observation?

4. ## Chemistry

Copper metal reacts with hot concentrated sulfuric acid solution to form aqueous copper (II) sulfate, sulfur dioxide gas and water. What type of reaction is this?

5. ## Chemistry

What volume does a mixture of 14.2 g of He and 21.6 g of H2 occupy at 28 degrees celcius and 0.985 atm?

6. ## Calculus

A fence 8 ft. tall runs parallel to a tall building at a distance 4 ft. from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

7. ## Calculus

The rate of change R, in kilometers per hour, of the altitude of a hot air balloon is given by R(t)=t^3-4t^2+6 for time on the interval [0,4], where t is measured in hours. Assume the balloon is on ground level. What is the maximum altitude of the balloon

8. ## Chemistry

When 1 mol of gaseous hydrogen chloride is dissolved in enough water to make 1 L of solution, approximately how many HCl molecules remain in the solution?

9. ## Health

If I were to stay up all night trying to finish my homework (like I am now) will caffeine help, or does it make it harder to work at all?

10. ## Chemistry

In the CO3^2- ion, all three C-O bonds have identical bond lengths of 136 pm. Why?

11. ## Physics

On earth, a certain type of bacteria doubles in number every 24 hours. Two cultures of these bacteria are prepared, each consisting initially of one bacterium. One culture is left on earth and the other is put on a rocket travelling at .866c relative to

12. ## Chemistry

Knowing that 2 aluminum atoms and 3 chlorine molecules react to produce 2 units of aluminum chloride, how many moles of aluminum chloride can be produced by reacting 7.8 moles of chlorine with excess aluminum?

13. ## Calculus

How do you find the indefinite integral of (x^2-29x+5)/(x-4)^2(x^2+3)?

14. ## Chemistry

Three 75.0-g samples of copper, silver, and gold are available. Each of these samples is intially at 24.0 degrees C, and 2.00 kJ of heat is applied to each sample. Which sample will end up at the highest temperature?

15. ## English

Can anyone figure out this riddle?: With sup I'm a brace. You hope is enough; Alone I'm some docks, with sailors and stuff. What am I?

16. ## Calculus

What is indefinite integral of 1/(x^2-4)^(1/2)?

17. ## Trig

What are some real life applications of logarithims?

18. ## Physics

Twelve uniform, thin rods of mass M and length L are welded together to form a hexagon "wheel." What is the moment of inertia of this wheel for rotation around an axis through its center and perpendicular to the plane of the wheel? (The welds contribute no

19. ## Calculus

How would you solve this differential equation? dy/dx=1/2x+y-1

20. ## Calculus

Hello! I am a little stuck (probably because I cannot remember my trigonometric functions). Does anyone know how to solve this equation? [-sin(x)]^2-2cosx

22. ## Trig

What are some real life applications of logarithims?

23. ## Health

Is eating a lot of acidic foods at a time unhealthy?

24. ## Calculus

Hello! I am a little stuck (probably because I cannot remember my trigonometric functions). Does anyone know how to solve this equation? [-sin(x)]^2-2cosx

26. ## Biology

Please give an example of natural selection that does not include a predator/prey relationship.

27. ## Calculus

Find derivative of (x+1)/(x^2+1)^(1/2)

28. ## Spanish

What is a good sentence that uses the subjunctive tense of "reconciliarse"?

29. ## Math

What is an example of two functions that intersect at least twice in the first quadrant but can neither be a polynomial or a "simple" function (i.e., sin(x), e^x)?

30. ## Health

What is the difference between low and high blood pressure?