Cold Packs
<u>Explanation:</u>
Endothermic reactions are reactions in which heat is absorbed from the surroundings and the container in which the reaction takes place is said to be very cold. In cold packs, ammonium nitrate is used, is dissolved in solution is said to be an example of endothermic reaction, in this the heat energy is absorbed from the surroundings. In this the solute increases the solubility with the rise in temperature, and also used in cold packs.
Answer:
The first, second, and 4th option
Explanation:
The density of carbon tetrachloride, given the data is 1.59 g/mL
<h3>What is density? </h3>
The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
with the above formula, we can determine the density of carbon tetrachloride. Details below:
<h3>How to determine the density of carbon tetrachloride</h3>
The following data were obtained from the question:
- Mass of flask = 345.8 g
- Mass of flask + carbon tetrachloride = 703.55 g
- Mass of carbon tetrachlorcide = 703.55 - 345.8 = 357.75 g
- Volume of carbon tetrachlorcide = 225 mL
- Density of carbon tetrachlorcide =?
Density = mass / volume
Density of carbon tetrachlorcide = 357.75 / 225
Density of carbon tetrachlorcide = 1.59 g/mL
Learn more about density:
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Sodium Oxide ---> Na2O
Calcium Chloride ---> CaCl2
Potassium Sulfide ---> K2S.
I hope this helps! :)