i want to know is this true or false

i want to know is this true or false

A substance has a density of 2kg/L. 4kg of this substance is then placed in 10 liters of water. What is the volume percent of this in 10 mL water?

Fat gives 9 cal/g of energy

Ionisation energy of Cl- is 349KJ/mole. Approximate heat liberated when an electron is added to gaseous atom a)5x10-20J b)5.9x10-19J c)6.5x10-20J d)3.49x10-26J

Density of gas is .737g/ml. You pump 7.2 gallons of gas. How much mass did you add to the car in kilograms?

Please answer. I'm really bad a chem so I don't understand what to do

A lab group is provided with a 1.35 x 10-4 M stock solution of Allura Red and a 25.00 mL volumetric flask. A student prepares a dilute solution by pipeting 2.00 mL of the stock solution into the 25...

Urgent help needed

I have to use a chart but I'm not sure how to start it.

hi I'm study for a midterm and i have a bunch of questions which are left blank and i can't find the answer online if you can can thank you so much consider the following elements BR...

chemistry and society

Calculate the percent of weight change for a reaction which combines 5.0 grams of reactant A with 2.0 grams of reactant B and produces 7.5 grams of product C. Show all work please

A 15.00 mL sample of 0.500 molar aceic acid is being titrated with 0.750 molar sodium hydroxide. The Ka of acetic acid is 1.76 x 10^ -5. (a) 0.00 mL (b) 2...

Sodium metal is sometimes used as a cooling agent in heat exchange units because of it's relatively high molar heat capacity of 28.2 J/mol C. what is the specific heat of sodium in J/g C?

I really need to know if it's possible to calculate the amount of B12 existent in different foods, is it possible to calculate it myself? I can't just research it on the internet.

Calculate the mininum mass of calcium oxide, CaO(s), that a student must use to attain the amount of heat of a 150.0 g sample of water from 25.0 degrees C to 60.0 degrees C. (I already calculated...

How many joules of hear are required to raise the temperature of 550g of water from 12.0°C to 18.0°C

Solving for heat (q) chemistry questions

Assume that each breath has a volume of about 0.5L, and that you are breathing 15 times a minute.

When 25mL of 1.0M H2SO4 is added to 50mL of 1.0M NaOH at 25c in a calorimeter, the temperature of the aqueous solution increases to 33.9C. Assuming that the specific heat of the solution is 4.18J/g...

Explain please.

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