Thursday

April 24, 2014

April 24, 2014

Total # Posts: 28

**Statistics**

First one is the treatment has no effect

**Math**

Pls help me find the volume of rectangular prism: Width 23cm Height 8cm Length 14.2

**Chemistry**

Given the balanced equation N2(g)+3H2(g)==>2NH3 Calculate: a)the volume H2 that reacts with 12L of N2 b)the volume of NH3 produced Iron 4L ofN2 c)the volume of N2 and H2 to produced 60L of NH3 Assume that all volume measurements are made under identical conditions

**Chemistry**

Consider the reaction MnO2+4HCL===>MnCl2+Cl2+2H2O How many grams of MnO2 are required to produce 5.6 of Cl2 at stp?MnO2=87

**Chemistry**

How many grams of sodium-hydroxide will react with 49g of phosphoric acid? H3PO4=98g/mol,NaOH=40/mol.The equation is:3H2O+Na3PO4

**chemistry **

Balance each of the following equations a)CH4+CL2......>CCl4+HCl b)AL(OH)3+H2SO4.....>Al2(SO4)3+H2O c)Fe+H2O......>fe3O4+H2 d)Al4C3+HCl......>AlCl3+CH4 e)C2H6+O2......>CO2+H2O f)P2H4.......>PH3+P4 g)S2Cl2+NH3......>N4S4+NH4CL+S8 h)Ag+HNO3.......>AgNO3+N...

**chemistry**

Given the reaction 1/2 N2( g) + 3/2 H2 (g) ___> NH3 (g) +11.0kcal.Is this reaction exothermic or endothermic?

**Chemistry**

An ideal gas originally at 0.8 atm and 77C was allowed to expand untel its final volume ,pressure and temperature were 600 ml ,0.4 atm and 27C.what was the initial volume

**Chemistry**

A gas occupied 870 ml under a pressure of 720 mmHg at a temperature of 17C ,the next day it was measured under a pressure 0f 750 mmHg at a temperature of 21C.what volume did the gas occupy under these condition

**Chemistry**

Determine the atomic weight of X in the following compounds a)8g XH4 occupy 44.8L volume at 237C and 380 mmHg pressure b)1.92g of X3 occupis a volume of 574 ml at 77C and 2 atm c)A O.326 gram of gas,C3X4 has a volume of 250 ml at100C and 76 cmHg d)A 3.12 gram of the gaS.HX,occ...

**Chemistry**

If we add 25g oe calcium carbonat with 73g of Hcl.what is the volume carbon dixiode in litres.

**Biology**

True

**Chemistry**

If we add 25g oe calcium carbonat with 73g of Hcl.what is the volume carbon dixiode in litres.

**Science**

Friction

**Chemistry**

35.79 of cr2 (X2O4)3.6H20 contains 8.19H20.what is the atomic wight of x

**chemistry**

3.429 X2 (SO4)3 contains 0.12 mol of oxygn tom.what is the atomic wight of x?

**physics**

A police car moveing at 140 km/h is changing a lorry moveing at 120 km/h.If the initial distance betwen them is 500m,how many minutes later and at what distance from its initial position does the police carb catch the lorry

**physics**

A car travels from city a to city b at a constant speed of 60 km/h.A bus leaves city a 1h after the car and catches it as it enters city b.the distance betwen the cities is 240 km.what is the speed of the bus{assumed to be constant] during its journey

**physics**

A car travels from city a to city b at a constant speed of 60 km/h.A bus leaves city a 1h after the car and catches it as it enters city b.the distance betwen ehe cities is 240 km.what is the speed of the bus{assumed to be constant] during its journey

**physics**

two vhiles move in opposite dirctions to each other with constant speeds of 20 m/s and 30 m/s if the initial distance betwen the vehicles is 100 km. how many second later do they meet

**physics**

a hlicopter takes off and travles 300 km due north then returns to its landing field. what is its displacment?

**chemistry**

A 210 g iron bar is heated and then placed in 100. g of water in an insulated container. The water temperature increases from 21.2 °C to 53.3 °C. What was the initial temperature of the iron bar? (Specific heats: cFe = 0.449 J/gK; cwater = 4.184 J/gK)

**physics4**

8)A car is traveling at a velocity of 120 Km/h stops at a traffic light after 2 minutes. Calculate its acceleration in Km/min2 (Kilometers/minute2)

**physics3**

7)A bus leaves Dubai at 10 am heading towards Abu Dhabi. The bus is moving at an average velocity of 120 Km/h. At what time is the bus expected to arrive Abu Dhabi assuming that the two cities are 150 Km away?

**physics2**

6)Adam is running at an average velocity of 6 Km/h. How many meters would Omar run after 15 minutes?

**physics**

5)As the traffic light becomes green, a car starts to travels with an acceleration of 2.5 m/s2. Calculate the velocity of this car in km/h after 12 seconds of acceleratio

**science**

Mass

**Chemistry**

it is polar

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