Thursday

July 24, 2014

July 24, 2014

Total # Posts: 43

**chemistry**

First you need to find the limited reactant. You do this by dividing the 2.0 g of NaSO4 by it's molar mass as well as the 2.0 g of Calcium Sulfate dihyrdate (CaCl2 + 2H20) You'll find that the Calcium sulfate is the limited reactant. From there you Take the moles of Ca...

**Chemistry**

A solution of H2SO4(aq) with a molal concentration of 1.66 m has a density of 1.104 g/mL. What is the molar concentration of this solution?

**Chemistry**

A solution is made by dissolving 0.624 mol of nonelectrolyte solute in 795 g of benzene. Calculate the freezing point and boiling point of the solution. Tf=_ˆC Tb=_ˆC

**math**

Explain why 61 degrees

**math**

If the temperature at 10 o'clock is 46 degrees ,at noon it is 54 degrees, 2 o'clock it is 62 degrees, at 6 o'clock it is 60 degrees what would the temperature at 4 o'clock be

**Math**

How would I solve equations with variables on both sides? Please help!

**Physics**

A sports car moving at constant speed travels 150 meters in 5.4 seconds , then brakes and comes to a stop in 3.9 seconds What is the magnitude of its acceleration in ? What is the magnitude of its acceleration in g's (g= 9.80 m/s^2 )?

**nutrition and wellness**

basketball football and swimming

**Chemistry**

You are planning an experiment that requires 0.0610 mol of nitrogen monoxide gas (NO). What volume would you need at STP? Answer in units of L

**Math**

the common denominator for all of the fractions would be six. as long as you multiply or divide the top and the bottom with the same number you do not break any math rules. 2/3=(2*2)/(3*2)=4/6 1/2=(1*3)/(2*3)=3/6 4/12=(4/2)/(12/2)=2/6 and 5/6=5/6 order the common fractions wit...

**math**

y'=2x-1 y'=0 when x is .5 at (.5,-.25) you have a local and global minimum. the global maximum would be infinity because the function is continuous on all real x and the parabola opens up.

**math**

A 100/(1+9*1)=10 b lim as t->infinity is 100 c the growth rate at time 0 is 9

**chemistry**

What pressure would be required for neon at 25 degrees C to have the same density as argon at 25 degress C and 1.00 atm?

**chemistry**

What pressure would be required for neon at 25 degrees C to have the same density as argon at 25 degress C and 1.00 atm?

**chemistry**

What pressure would be required for neon at 25 degrees C to have the same density as argon at 25 degress C and 1.00 atm?

**Physics**

Two spherical objects with a mass of 2.88 kg each are placed at a distance of 2.12 m apart. How many electrons need to leave each object so that the net force between them becomes zero?

**Physics**

Vector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place?

**chemistry**

Both Fe2+ and Cd2+ are precipitated by sulfide. However, they can be quantitatively separated through pH adjustment. You are given a solution containing 0.086 M Fe2+ and 0.062 M Cd2+. Calculate the [H+] range for a saturated H2S solution (ie, [H2S]=0.10 M) in which at least 99...

**chemistry**

Calculate the pH range required to separate 99.99% of Cr3+ from Zn2+ by precipitation of Cr(OH)3(s) in a solution that is initially 0.034 M in both Cr3+ and Zn2+. Use the Ksp values from Table 16.2 of Chang and calculate the pH to the nearest 0.01 pH unit. Lowest pH= Highest pH=

**chemistry**

i figured it out but how do i get the Low end and High end?

**chemistry**

The solubility products of AgBr and Ag3PO4 are 5.0 10-13 and 1.8 10-18, respectively. If Ag+ is added (without changing the volume) to 1.00 L of a solution containing 0.31 mol Br ‾ and 0.31 mol PO43-, calculate the molarity of Ag+ ions required to initiate precipitation ...

**Chemistry**

well thats the ksp they gave in the question

**Chemistry**

use the Ksp of SnS2= 1.0X10^-70 and calculate the pH of a hydrogen sulfide solution needed to precipitate 99.99% of the tin(IV) ion assuming [Sn^4+]=0.05M and that [H2S]=0.10M.

**chemistry**

If 29.0 mL of 0.10 M Ba(NO3)2 are added to 76.0 mL of 0.21 M Na2CO3, will BaCO3 precipitate? Calculate Q

**Chemistry**

A solution containing Pb2+ and a solution containing IO3- are poured together and quickly mixed. After mixing, the solution contains 0.0030 M Pb2+ and 0.040 M IO3-. Immediately Pb(IO3)2(s), which has Ksp=2.510-13, begins to precipitate. Calculate the free concentrations of Pb2...

**Chemistry**

What concentration of chloride ion is required to precipitate 99.9% of the lead ion from a solution with [Pb^2+]= 0.045 mol/L ?

**Chemisty**

Let's explore the efficiency of chloride ion precipitation in seperating Ag^+ from Pb^2+ in a solution. Suppose that [Pb^2+]= 0.045 mol/L and [Ag^+]= 0.084 mol/L. Calculate the chloride ion concentraion required to just start precipitation of Pb^2+ ion and then calculate t...

**chemistry**

A container is charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature? 3H2(g) + N2(g) 2 NH3(g)

**Chemistry**

Consider the following equilibrium reaction: NaHCO3(s) Na2CO3(s) + H2O(g) + CO2(g) When 100 g of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200°C, and the system comes to equilibrium. What happens to the partial pressure of ca...

**Geometry**

what are the 2 lengths on top and bottom of plot 1, and what is the length on plot 3. with the following info I can answer

**social studies **

The Nubians worshipped only one god

**social studies **

Nubia was a kingdom to the south of egypt true or false

**Chemistry HEAT OF FUSION**

What amount of energy is required to melt a 26.9 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice = J What amount of energy must be removed from 120 g of water to cool it from 72.1oC to 12.4oC? Specific heat of water = 4.184 JK-1g-1 Ent...

**Chemistry HEAT OF FUSION**

What is the final temperature, in oC, after a 15.0 g piece of ice, at 0oC, is placed in a styrofoam cup with 128 g of water initially at 74.0oC. Assume there is no transfer of heat to or from the surroundings. The specific heat of water = 4.184 JK-1g-1 The heat of fusion of ic...

**Chemistry**

Ethanol (C2H5OH) boils at a temperature of 78.3oC. What amount of energy, in joules, is necessary to heat to boiling and then completely vaporize a 22.8 g sample of ethanol initially at a temperature of 16.5oC. The specific heat of ethanol is approximately constant at 2.44 JK-...

**Business**

You have been retained to analyze how many check-in agents should be used at a check-in counter for a large hotel. During normal business hours, customers arrive at a rate of about 24 per hour, and it takes about 7 minutes to complete the check-in process. Both the poisson dis...

**physics**

A wave of amplitude 0.37 m interferes with a second wave of amplitude 0.18 m is traveling in the same direction. What is the largest resultant amplitude that can occur?

**Math **

About 3/4 of the track team are girls. About 3/4 of these girls are in 8 th grade. What fraction of th e students are grade 8 girls? 1/3?

**Algabra**

What is 2/5 of 6?

**physics**

: A 50kg wooden crate rests on a horizontal concrete floor. The coefficient of friction is u=0.7. What is the magnitude of the frictional force?

**Schindler's List Essay**

this is garbage

**english**

carefully defined is defined an adj or adverb?

**Science**

A student heats 4.00 g of a blue compound, which reacts completely to produce 2.56 g of a white compound and an unknown amount of colorless gas. What is the mass of the gas? Answer?_________ Work area: Reactant (s) = Product (s)

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