Explanation:
Physical change is a change that does not affect the chemical composition of a substance but it changes the physical appearance like size or shape of the substance.
For example, crushing a can, melting of ice, breaking a glass etc represents the physical change.
Scenarios which represent examples of physical changes are as follows.
- Silicon is cut into tiny pieces for computer chips.
- Lead is melted to form pellets.
- Liquid water freezes to form ice.
There are 6.022 x 1023 molecules per mole (Avogadro's number). As there are 7.2 x 10-3 moles of hemoglobin, the number of hemoglobin molecules would be 6.022 x 1023 molecules/mole x 7.2 x 10-3 moles = 4.3 x 1021 molecules
Answer:
Explanation:
Rising carbon dioxide concentrations are already causing the planet to heat up. At the same time that greenhouse gases have been increasing, average global temperatures have risen 0.8 degrees Celsius
Explanation:
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