# Posts by Alz

Total # Posts: 14

**Calculus**

lim x -> pi/2 (sin(x/2)-cos(x/3)) Evaluate Please help

**Chemistry HELP**

Complete combustion of 3.30 g of a hydrocarbon produced 10.2 g of CO2 and 4.68 g of H2O. What is the empirical formula for the hydrocarbon? I did the calculation and the ratio comes out to C: 1 H: 2.24 So I thought the answer is CH2 but apparently its wrong. Anyone help..

**Chem**

The specific heat of water is 4.184 J/g degree C, and the specific heat of iron is 0.451 J/g degree C, which will reach a higher temperature when exposed to a given amount of heat?

**Chemistry**

What are washers, nuts, and bolts made of? Aluminum, Zinc, Iron, or Nickel?

**physics**

If the roller coaster track has a hill at the end that was equal in height to the original hill, would the marble make it all the way to the top? Please explain it to me! Thanks.

**US history**

I did read it. I am just confused between 1 and 4 because my teacher was talking about something regarding sharecropping related to Plessy v. Ferguson case today and i didn't get it.

**US history**

The answer is 1. right?

**US history**

The decision of the supreme court in the 1896 Plessy v. Ferguson case is important because it 1) upheld the legality of sharecropping 2) denounces the violence of the Ku Klux Klan 3) approved separate but equal facilities for black Americans 4) declared slavery to be illegal.

**Algebra**

Which value of r represents data with a strong negative linear correlation between two variables? 1) -1.07 2) -0.89 3) -0.14 4) 0.92

**Algebra**

Thank you! :D

**Algebra**

oops.. i meant: x^2+4x+y=4

**Algebra**

Which relation is not a function? 1)(x-2)^2+y^2=4 2) x^2+4y+y=4 3) x+y=4 4) xy=4 So, I could eliminate some answers. My answer is either its 1 or 2. Can anyone help me?

**Chem**

Does Organic compound have weak or strong intermolecular forces?

**Chemistry 11**

Carbon monoxide gas reacts with oxygen gas to form carbon dioxide gas acooridng to the following equation: 2CO(g)+O2(g)--> 2 CO2(g) IF 1 mole of CO2(g) is produves, how many kilojoules of heat energy are absorbed or released ?