Answer: many of the chemicals found in urban air are formed by chemical reactions driven by sunlight.
Answer:
AlF3
Explanation:
Aluminum fluoride (AlF3) is an inorganic compound in which aluminum and fluoride has ionic bond between each other.
Aluminum ( atomic number - 13) has 3 valence electrons and can lose 3 electrons to get a stable configuration while fluorine (atomic number - 9) can gain one electron to make a stable configuration. So in order to attain a stable configuration one aluminum (Al) atom form ionic bond with three fluorine atoms and form AlF3.
Hence, the chemical formula between Al and F is AlF3.
Answer:
A Calorimeter is a device used to measure the amount of heat involved in a chemical or physical process.
Explanation:
Ex- when an exothermic reaction ( accompanied by or requiring absorption of heat)occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution increasing its temperature.
- When an endothermic reaction (Heat evolving reaction) occurs, the heat required is absorbed from the thermal energy of the solution, decreasing its temperature.
A burning piece of coal which is releasing heat due to its combustion and is transferred to water.
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Answer:
Explanation:
<u>1, Formula</u>
- Mass percent = (mass of solute/mass of solution) × 100
<u>2. Determine mass of solution</u>
Substitute the data and clear the mass of solution:
- 3.5 = (3.0g / mass of solution) × 100
- 0.035 = 3.0g / mass of solution
- mass of solution = 3.0 g / 0.035
- mass of solution = 85.714g
<u>3. Determine the mass of solvent:</u>
- mass of solvent = mass of solution - mass of solute
- mass of solvent = 85.714g - 3.0g = 82.714g
Round to two significant figures: 83 g
