How are chemical and physical changes different on a molecular level? Chemical changes involve the breaking of bonds in molecule s. Chemical changes do not affect bonding between atoms. Physical changes do not involve molecules. Physical changes cause new molecules to form.
2 answers:
Answer:
How are chemical and physical changes different on a molecular level? Chemical changes involve the breaking of bonds in molecules. Chemical changes do not affect bonding between atoms. Physical changes
Explanation:
Answer: A Chemical changes involve the breaking of bonds in molecules.
Explanation: Because in a chemical change it breaks bonds of molecules and the other ones dont look right and this is the only statement that is true.
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Melting, as igneous rock is magma or lava that has cooled and hardened.
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Answer:
refractive index for water,glass,diamond are 0.752m, 0.667m, 0.413m respectively
Explanation:
refractive index (n) =
velocity =
The time for travel is kept constant for all mediums.
refractive index (n) =
distance in medium =
For water, n= 1.33
For glass, n=1.5
For diamond, n= 2.42
Answer:
Distance= 3.5/31536000 cm = 1.11 × 10^(-7) cm
Explanation:
Given ;
Average speed = 3.5cm/year
Time= 1 s
Distance = speed × time
Number of seconds in a year = 31536000 sec/year
Distance = 3.5 cm/year × 1/31536000sec/year × 1 s
Distance= 3.5/31536000 cm = 1.11 × 10^(-7) cm
Answer:
Giv en :
Mass (m) = 75 kg
Height (h) = 10 m
Acceleration due to gravity (g) = 9.8 m/s²
To Find :
Potential Energy (PE)
Explanation:
The formula for potential energy due to gravity:
Substituting value of m, g & h in the formula: