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Helen [10]
2 years ago
13

Grace wanted to find out the best conditions for growing lettuce plants.

Chemistry
1 answer:
Mariana [72]2 years ago
8 0

Explanation:

the investigation lasts for 7 days !

hope this helps you.

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Example 1: urea, (nh2)2co, is used in the manufacture of resins and glues. when 5.00 g of urea is dissolved in 250.0 ml of water
katen-ka-za [31]
A) i believe the reaction is exothermic, because 27.6 kg of thermal energy is gained by the water solution, the dissolution of urea is exothermic. Exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction where heat is gained by the reaction.

b) The water gained the heat released when urea dissolve. That is the water gained 27.6 kJ, while dissolution of urea released 27.6 kJ. Therefore, the heat gained is equal to the heat lost.

c) From part B, since heat gained is equal to heal lost, then
250 g × (Tf -30) ×4.18 J/g = 27600 J
 = 1045 Tf - 31350J = 27600 J
Tf = 56.41°C.
Therefore the final temperature  of the solution is 56.41°C

d) The initial and final temperature in Fahrenheit
°F = °C × (9/5) +32,
Thus, 30°C will be equal to 86° F
while 56.41 will be equivalent to  133.54 ° F


7 0
3 years ago
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Which best describes an element?
Alenkasestr [34]
What are the answer choices?
7 0
3 years ago
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When salt is dissolved in water, which is the solvent and which is the solute
elena55 [62]

Answer:

the solvent is water and the solute is salt

Explanation:

A solute is the component in a solution in the lesser amount. In a NaCl solution, the salt is the solute. A solution may contain more than one solute.

7 0
3 years ago
A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a ca
Fudgin [204]
119.84 c is the answer
6 0
3 years ago
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4. One gram of of ............... contains one type of atoms. a. iron b. ammonia c. hydrogen chloride d. water​
patriot [66]

Answer: hydrogen chloride.

Explanation:

7 0
2 years ago
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