# Posts by dylan

Total # Posts: 521

chemistry
N2 (g) + 3H2 (g) → 2NH3 (g)ΔH = -92.6 Calculate ΔH (in kJ) for the decomposition of 30.5 g NH3 (g) into N2 (g) and H2 (g)

Science
D?

Science
I tried but I cant find it.:O

Science
Which of the following quickly changes the land when gravity pulls loose rocks and soil down the side of a hill? A)a volcanic eruption B) an earthquake C) a fault D) a landslide

Pre-Algebra
Make a table with all the whole number pairs of length and width values that give an area of 24 square meters.

math
graph the points in each group and connect each point with the next point using straight line segments. Do not connect the last point in one group with the first point in the next group.

Physics
Its C because its moving

Physics
On an inclined plane, the Fn is only = to the y component of the Fg or vice versa.

science
a piece of wood that measures 3.0 cm by 4.0 cm by 5.0 cm has a mass of 90.og. what is the density of the wood? would the piece of wood float in water? remember the density of water is 1.00g/ml

Science
i have to do a research project on dolphins

geometry
The radius of a circle is 6cm and the arc measurement is 120 degrees, what is the length of the chord connecting the radii of the arc?

English 102

Math
Estimate to the nearest integer. Square root of -55

calculus
I posted one before but this is another one of those problems that i need help with! I don't know how to approach this one at all! Please help use the definition of the derivative to find f'(x) when f(x)= (4/x^2)+(2/5*x)

calculus

calculus
sorry! the numerator is 2+x and the denominator is x^3

calculus
I am learning derivatives and I despise having to use the definition of the derivative. Please check my answer for this particular one! it is different from the one I get by differentiating. The question: f(x) = 2+x / x^3 my answer: -6x^2-2x^2

math
Brown checked out 4 books and 1 videotape at the library. He returned them all 7 days late the library charges late fees at \$3.00 per week for a video and \$0.15 per day for a book. Write an expression that represents browns change if he paid his late fees with a \$10 bill?

science
why are dog fleas more successful parasitesthen bacteria that cause deadly diseases?

math
Mary's group of close friends are going to fifth grade in September. All are going to Belleview Elementary and their homerooms will be room 12, 14, or 16. All of her friends but 4 are going o room 12, all but 4 are going to room 14, and all but 4 are going to room 16. Not ...

math
MathMate attempted to help but did not show how the problem is answered. It only confused the problem. Could someone else please help? Thanks. The denominator of a fraction is 4 more than the numerator. If both the denominator and the numerator are increased by 1, the ...

math
The denominator of a fraction is 4 more than the numerator. If both the denominator and the numerator are increased by 1, the resulting fraction equals 1/2. What is the original fraction? **Need to show all work** Thanks for the help.

Chem 112
2.78

chemistry
How many milliliters of 3.0 M hydrochloric acid are i required to prepare 500 milliliter of 1.0 M Hydrochloric solution

Math
plot 7 on the x axis

math
Please help my equivalent fraction. I am greater than 1/5 and less than 1/2. My denominator is between 2 and 4. What fraction am I? Thanks for the help..

chemistry
A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?

chemistry
A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?

chemistry
A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?

ipc
how much power is used to move a 25 kg mass 8 meters in 15 seconds

Math
90/65=.7222*5=3.6111+5=8.6111 8.1 feet

ap chem
ok, i'm given: Ethylene Glycol C2H6O2 is the main ingredient in antifreeze. density of pure EG: 1.132 g/mL Anti-freeze is 32% by volume EG I have to find: Volume of Eg in 1 L Mass of Eg in 1 L & the Volume of "solvent" in 1 L Can someone help me? and give me some...

ap chem
ok, so i have to find the mass of the HNO3 in 1 L and the mass of the H2O in 1 L. I'm given: HNO3 solution 1.42 g/mL 16M I'm really terrible at this stuff and it should be easy, but I have no idea where to start.

ap chem
ok, sweet. i had most of that set up right. so the mass of HNO3 = 1008 g & the mass of H2O = 412 g?

ap chem
ok, so i have to find the mass of the HNO3 in 1 L and the mass of the H2O in 1 L. I'm given: HNO3 solution 1.42 g/mL 16M I'm really terrible at this stuff and it should be easy, but I have no idea where to start.

ap chem
would you multiply the 93.37 and the 1.071 then? is 100g correct?

ap chem
would it be 89.28 g?

ap chem
I'm supposed to find the mass of NaCl in 1 L & the mass of H20 in 1 L. I'm given NaCl solution. 1% by mass. The Density is 1.071 g/mL. I know the answer for NaCl is 10.71 g, but I don't know where to start to get to this. Could you lead me in the right direction?

essay writing

give me a senec with prehistoric

geometry
the area of the first triangle is 22 sq feet. if the scale factor of two similar traingles if 3, what is the area of that second triangle>?

Science
very urgent!!!!!!!!! plzz plzz answer or attempt!

Science
8. The balanced equation P4 (s) + 6H2 (g) --> 4PH3 tells us that 2 mol H2 a. reacts with 1 mol 4 b. produces 4 mol PH3 c. cannot react with phosphorus d. produces 2 mol PH3 e. reacts with 2 mol P4 idk y i cant seem to get the answer from the choices above?

math
1 1/12 = 13/12 =2-13/12 = 24/12-13/12 =11/12 of a cake left over.

chemistry
Yupp, Calcium Hydroxide. Ca is the cation --> calcium OH is the polyatomic anion--> hydroxide (: Hope it helped!

algebra
(6y+1)(6y-1)

Chem 11
4.21

Geometry
Right triangle

Visual Basic - Computer Science
Public Class Form1 Public SparkPlugsString(,) As String = {{"VBAutoPart", "Brand A", "Brand C", "Brand X"}, {"PR214", "MR43T", "RBL8", "14K22"}, {"PR223", "R43", "RJ6"...

Visual Basic - Computer Science
I'm trying to right a program with Multidimensional Arrays. These are the instructions for the program: The Valley Boulevard (VB) Auto Center management is pleased with your progress in developing their system. They require you to develop a new feature for their system. ...

chemistry
using a universal ph paper to test the Ph of purple grape juice is unlikely to be successful why

Physics
Define the focal length of a convex mirror?

Math
x+2=6 and its under a square root thing

Math
3x-6y=12 find the slope, y intercept and general equation

Math
solve using addition or subtration 12x+9y= 14 6x= 7y - 16

math
Mrs.penn has a circular tablecloth with a circumference of 29 feet. Which expression could be used ro find the radius of the tablecloth? f. 29 - 2 pie g. 29/2 pie h. 29/pie j 29 + 2pie

Chemistry
the idea expressed in whims is known as

science
chief or ruler .

what is the smallest number of pencils that are needed to put into jars holding 3,6 and 9 leaving no remainder.

Math
9*3

precal
the terminal side of an angle in standard position coincides with the line y=x in quadrant I. find tan to the nearest thousandth

math
Answers are: 1. D 2. B 3. C 4. B 5. D(obviously) 100% for Unit 1 Lesson 7 Quick Check for connexus!!!! Hope it helped, love you guys!??

Math
if four friends share equally a 48 ounch bag of popcorn what fraction would each one get?

algebra
x/14+12=3x-8.5

algebra
x/14+12=3x-8.5

Algebra
x/14+12=3x-8.5

Math
Find a number whose square root is 24 more than 5 times the number. How do I set up this problem? Thank you for any help!

algebra I
Find a number whose square root is 24 more than 5 times the number. How do I set up this problem?

AP CHEM
HIO3 + FeI2 + HCl --> FeCl3 + ICl (in acidic solution) Show and label the two balanced half-reactions (oxidation and reduction). Add H2Os, H+s or OH-s as needed.

Physics
What force is required to accelerate an object of 1.484x10^0 kg over a frictionless surface at -2.3580x10^0 m/s2 expressed to three significant figures.

Chemistry
921.4919096 g/mol does this look to be right? or 1 grams 850.49 NF3 is equal to 0.00108519672238 mole does this look better?

Chemistry
How many moles of NF3 are in 850.49 grams of nitrogen triflouride

Chemistry
ok so C = 19x 12.01 = 228.19 H = 97 x 1.001 = 97.097 Cl = 35 x 35.45 = 1240.75 =1566.037 g/mol is this look ok

Physics
A motorcycle with an initial velocity of 7.99x10^0 m/s accelerates for a total of 3.3x10^0 seconds at a rate of 1.51x10^0 m/s2. What is it's velocity, to two significant figures? can anyone show the calculations for this

Physics
For a standard production car, the record for road test acceleration goes to the 1993 Ford RS200 Evolution. This car went from 0 to 2.911x10^1 m/s in 3.279x10^0 seconds. What is the average acceleration, expressed to 3 significant figures?

AP Chem
A student chemist named Hannah Montana set up an electrical conductivity tester similar to that shown on page 141 and conducted an experiment involving two clear, colorless liquids, identified as solution A and solution B. Solution A and Solution B are both 0.050 M. The ...

Geography
How do the shores of Long Island differ from each other. The South Shore and he North Shore

social studies
does anyone know the 4 prehistoric indian groups that lived in indiana?

math
This is dylan i am just learning square root i need this answer for my homework which is do tommorow so please write the answer back to me thanx every1 and please check your answer before ypu post it.Thanx Every1.

math
Each ostrich needs a pen about 20 feet by 10 feet.How many square feet of space will be needed by 11 ostriches.

In the zoo there is penguins and polar bears 120 people visted both of them but only 75 people to photograghs how many people bought souvenior photographs please multiply

geography
What does Pig ears stand for?

geometry
X would be 17.5, as long as the answer isn't required to be a whole number.

physics
need answer fast- running out of time

physics
A truck is stopped at a stoplight. When the light turns green, it accelerates at 2.7 m/s2. At the same instant, a car passes the truck going 18 m/s. Where and when does the truck catch up with the car?

Science
The portion of the nervous system that controls involuntary activities is a subdivision of the ____ nervous system. A. sympathetic B. central C. peripheral D. parasympathetic I think it's either B or C right?

Science
What process describes how a signal travels from one end of a neuron to the other end? A. Hormonal regulation B. Muscle coordination C. Membrane excitability D. Neurotransmitter release I'm pretty sure the answer is C but just want to be positive.

medicine
A patient was experiencing indigestion almost every day. The physician performed an upper GI series, also known as a ____ test. a) bronchographic b) barium enema c) cholangiographic d) barium swallow I've been searching for hours and cant find the answer. Please help!!!

How Children learn
19. C 20. A

math HELP
ur such a homo. oh and your mom wanted to join

math HELP
why don't u want to join

thanks wanna join

what is a historical fact about independent and dependent events. im having so much trouble finding this answer on the enternet. HELP! thanks

trigonometric
ya drwls is right haha

math #2

math

math
Look at the pattern of shaded numbers. use place value to describe how the number change.