The skeletal system of a human body is the only one that can get fossilized. The remains of ancient species are preserved as fossils. Body parts must typically be hard and able to be mineralized without losing their form or degrading in order to become fossilized.
Any surviving remnants, impression, or evidence of a once-living creature from a previous geological epoch is referred to as a fossil. Examples include fossilized bones, shells, exoskeletons, animal or microbe impressions in stone, amber-preserved artifacts, hair, petrified wood, oil, coal, and DNA traces.
In river valleys, cliffs, hillsides, and man-made exposures like quarries and road cuts, sedimentary rocks of the appropriate age are exposed, and these are the places where fossils are most frequently found.
The most typical kind of fossilization takes place quickly after an animal dies when it is buried under material, such sand or silt. Sedimentary deposits shield its bones from decaying.
Thus, The remains of ancient species are preserved as fossils.
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In salt water solution, the salt is the solvent.
Due to the length of the question I am giving 25 points per person
It is a physical change becasue the chemical makeup of the water molecule did not change - the molecule just changed state.
Happy to help!
The concept of surface tension, enforced by cohesive forces between water molecules, explains why a water droplet hangs from your finger and why water stays together momentarily after a balloon is popped.
The similarity between a drop of water hanging from your finger and the water staying together after a balloon is popped is surface tension. Surface tension is a physical property of liquids which makes them act like they are covered with a stretched elastic sheet. This property is caused by the cohesive forces between liquid molecules.
When a water droplet hangs from your finger, the cohesive forces of the water molecules hold them together in a droplet shape due to surface tension. Similarly, when a water-filled balloon is popped, the water doesn't immediately disperse into a fine spray but rather holds together momentarily. This is also due to cohesive forces and surface tension. Each water molecule is pulled equally in every direction by its neighboring water molecules, resulting in a net force of zero and maintaining its shape momentarily even without the balloon.
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The number of molecules of isopently acetate is 4.63 x 10¹⁵ molecules
calculation
Step 1: find the moles of isopently acetate( C₇H₁₄O₂)
moles = mass÷ molar mass
From periodic table the molar mass of C₇H₁₄O₂
= (12 x7 ) + (1 x14) +(16 x2) =130 g/mol
moles = 1 x10⁻⁶ g÷ 130 g/mol = 7 x 10⁻⁹ moles
step 2 ; use the Avogadro's law constant to calculate the number of molecules
That is according to Avogadro's law 1 mole = 6.02 x 10²³ molecules
7 x 10⁻⁹ moles = ? molecules
by cross multiplication
= { (7 x 10⁻⁹ moles x 6.02 x10²³ molecules) / 1 mole} = 4.63 x 10¹⁵ molecules