Answer:
Non-renewable resources, such as coal and oil, are the primary source of power in the world, and they are used to power vehicles, factories, and homes. Although affordable, they can be harmful to the environment and are one of the notable contributors to global warming.
Explanation:
source:cfi
Average velocity (v) of an object is equal to its final velocity (v) plus initial velocity (u), divided by two. Where: ¯v = average velocity.
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Answer:
The atomic mass of an atom is the number of protons plus neutrons.
Fact: In case you get it confused with atomic number, atomic number is the number of protons in the atom.
Explanation: It could have been electrons plus neutrons since electrons equals protons but electrons aren't stable which is why it is protons and neutrons.
Answer:
Freezing point of solution = - 2.82°C
Explanation:
Formula to solve this, if we assume complete ionization of salt.
AlNO₃ → Al³⁺ + 3NO⁻ i = 4
Freezing point of solution = - (Kf. m . i - 0°C)
Freezing point of pure solvent - Freezing point of solution = Kf . m . i
Freezing point of pure solvent = 0°C
Kf for water = 1.86 °C / m
Let's convert the mass of solute to moles → 287 g . 1mol/ 88.98 g = 3.22 moles
m (mol/kg) → 3.22 moles / 8.50 kg = 0.379
Freezing point of solution = - Kf. m . i + 0°C
Freezing point of solution = - 1.86°C /m . 0.379 m . 4 → - 2.82°C