Ali runs a paper chromatography experiment using the same ink, but three different solvents. Solvent A separates the components
into three bands, solvent B separates it into two bands, and solvent C does not separate the ink. What should Ali conclude?
1 answer:
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Answer:
Physical Change
- When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.
- Physical change is a temporary change.
- A Physical change affects only physical properties i.e. shape, size, etc.
- A physical change involves very little to no absorption of energy.
- Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. .
- In a physical change, no new substance is formed.
- Physical change is easily reversible i.e original substance can be recovered.
Chemical Change
- When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
- .A chemical change is a permanent change.
- Chemical change both physical and chemical properties of the substance including its composition
- During a chemical reaction, absorption and evolution of energy take place.
- A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
- A chemical change is always accompanied by one or more new substance(s).
- Chemical changes are irreversible i.e. original substance cannot be recovered.
Answer: 1 mole ➡️ 6.022×10²³ atoms of si.
X mole ➡️ 2.8×10²⁴ atoms of si.
X = 2.8×10×10²³/6.022×10²³
= 28/6.022
= 4.65 moles.
Explanation:
Answer:
Maybe try to memorize it by the valence electrons. You can do this!!
Answer:
i would try A
Explanation:
<span>The general formula of an amino acid is R-CH(NH2)-</span>
