Answer:
When effervescent antacid tablets are dropped into water, the tablets slowly disappear and the water becomes fizzy- endothermic
On a hot day, water vapor condenses out of the air and turns into liquid droplets on the outside of a cold glass of lemonade- exothermic
The copper on the Statue of Liberty oxidizes and turns blue.- endothermic
Explanation:
An exothermic reaction is a reaction in which heat is given out to the surrounding. The temperature of the system increases when an exothermic reaction occurs. An endothermic reaction occurs when heat is absorbed and the temperature of the system decreases. Oxidation of elements and effervescence of antacid solution are endothermic processes.
Given that the water vapour in air losses energy upon condensation to liquid, the process is exothermic
Answer:
Count how many significant figures are in a number, and find which digits are significant. You can use this calculator for significant figures practice: Test your ability to find how many significant figures are in a number.Enter whole numbers, real numbers, scientific notation or e notation. Example inputs are, 3500, 35.0056, 3.5 x 10^3 and 3.5e3.
Explanation:
1. 134
2. 283
3. 58.3
4. 212
5. 149
6. 180
7. 400
8. 100
9. 127
10. 77
Explanation:
The given data is as follows.
mass (m) = 107 g,
= 
Specific heat of water = 4.18 
Since, the relation between heat energy, mass and temperature change is as follows.
q = 
Hence, putting the given values into the above formula to calculate the heat energy as follows.
q =
= 
= 1654.86 J
Therefore, calculate the enthalpy of this reaction for 2.00 mol of a compound as follows.
= 827.43 J/mol
or, = 
(as 1 kJ = 1000 J)
= 0.827 kJ/mol
Therefore, we can conclude that enthalpy of this reaction is 0.827 kJ/mol.
Answer:
= 1.0593 g
Explanation:
1.1% NaCl by mass, means;
1.1 g per 100 g = 0.011
Therefore; the amount of NaCl present in 93.6 g of the solution is;
= 0.011 × 96.3 g
<u>= 1.0593 g</u>
