Posts by el
Total # Posts: 30
1. What should be avoided at mealtime? A. praising the host B. having a second helping C. tasting everything D. starting to eat before others***
We have an aqueous solution that contains 22% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 215 g/mol. The density of the solution is observed to be 1.1 g/mL. What is the molarity of Z in this solution?
What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
Suppose f varies inversely with g and that f=20 when g=4. What is the value of f when g=10?
The electronegativity difference between potassium and iodine is 2.7 0.8 = 1.9, which is > 1.7. The bonding in KI is predicted to be ionic.
A metal bar having a mass of 212 g is heated to 125.0°C and then dropped into 375 g of water at 24°C. After a while the temperature of the water and the metal is 34.2°C. If the specific heat of the metal is 0.831 J/g°C, how much heat did the metal lose?
Thank you SOOO much, Damon! I used the formula that you gave, and I got the answer right! I am beyond grateful! :)
a gold bar weighing 33.5 g and having an initial temperature of 25.0 Celsius absorbs 5000 J of heat. What would the new temperature be?
spanish - HELP!
where can I use Group I and II anions in the field of medicine especially as a medtech student?
if 1.00 g of silver nitrate is combined with 1.00g of sodium chloride what is the mass of the solid if you have 75% yield?
The stopping distance D of a car after the brakes have been applied varies directly as the square of the speed s. A certain car traveling at 70 mi/h can stop in 343 ft. What is the maximum speed it can be traveling if it needs to stop in 160 ft?
A 10 kg block sits on a flat surface whose μs=0.60 and whose μk is 0.40 a. What horizontal force is required to get the block move? b.If we continue to apply the same force as in part a. what will the blocks acceleration be?
upper atmosphere chloromethane can be decomposed by light according to the reaction:CH3Cl -> CH3(g) + Cl(g)The energy required for this reaction is 428 kJ mol1. If each molecule of chloromethane is decomposed by one photon, what is the maximum wavelength that photon ...
Calculate the normal freezing point of an aqueous solution containing 30% w/w ethylene glycol. Thanks
The vapor pressure of water at 80 degrees c is 355mmHg. A 100cm3 vessel contained wateraturated oxygen at 80 degrees c., the total gas pressure being 760 mmHg. The contents of the vessel were transferred by pumping to a 50cm3 vessel at the same temperature. What were the ...
In an emergency stop to avoid an accident, a shoulder-strap seatbelt holds a 58 passenger in place. If the car was initially traveling at 94 and came to a stop in 5.2 along a straight, level road, what was the magnitude of the average force applied to the passenger by the ...
When a horizontal force of 350 is applied to a 86.0 box, the box slides on a level floor, opposed by a force of kinetic friction of 130 .What is the magnitude of the acceleration of the box?
the enthalpy of fusion of ice is 6.02 kJ/mol. the heat capacity of liquid water is 75.4 J/molC. What is the smallest number of ice cubes at 0 degrees C each containing one mole of water, necessary to cool 500g of liquid water initially at 20.0 degree C to 0.0 degree C
Integrated Physics and Chemistry
Radiation occurs even in a vacuum, as matter can give off energy in the electromagnetic spectrum, depending on its form and temperature.
how do oxidation-reduction and phosphorylation reactions drive the glycolytic pathway?
How does the movement of electrons and protons create large amounts of energy in oxidative phosphorylation?
thank you very much!
Could you show how you solved this problem?
How many grams of FeCl2 should be dissolved in 1 kg of water to make its boiling point equal to 101.56 degrees centrigrade at atmospheric pressure of 1 atm? (Kb=0.52 degrees Celsius/m; solute is completely dissociated). Thanks!! =)
for a given substance what information links mass to moles? number of particles
I have problems with this question. Can anybody help me? When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater. Ca(OH)2, cloudy,due to the formation of a white precipitate. The chemical was... ...
Which Law of Motion explains the action-reaction pair of forces. The first, second or third?