Answer:
Advantages of sunlight are .
- it gives us vitamin D
- preventing disease, and promoting good mental health
hope it is helpful to you
Answer:
Sufficient concentration and correct orientation of particles
Explanation:
The collision theory postulates that, for a chemical reaction to occur, there must be collision between reacting particles.
It implies that the rate of reaction depends on the number of collisions per unit time as well as the fraction that are successful or effective.
For collisions to be effective, there must be proper orientation of the particles and right concentration of the reactants.
- The number of effective collisions and rate of reaction are directly proportional to the concentration of of the reactants.
Answer:
True
Explanation:
The physical and chemical properties of a substance depend on the nature of intermolecular forces between its molecules. For instance, water has a high boiling point because of hydrogen bonding between water molecules. Liquid water is denser than ice because of the difference in the nature of hydrogen bonding in liquid water and ice.
Answer:
Explanation:
The expression for density is:
M is molar mass of Calcium = 40.078 g/mol
For cubic closest packed structure , Z= 4
is the density
Radius = 197 pm = 
Also, for fcc, 
Thus,
Only the third option is true: The individual substances in a mixture lose their original chemical properties. The atmosphere is most definitely not a solution and sugar is not a solvent.
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