A biologist wants to flash freeze several samples that she has collected from her experiments. She does this by dipping the specimens into extremely cold liquids that rapidly freeze the sample. The liquid must be colder than –175 °C. Identify which substances the biologist can use to flash freeze her samples.

chemical energy is stored in the chemical bonds of atoms and molecules. it can only be seen when it is released in a chemical reaction. when chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.

this chemical reaction releases energy in the form of light and heat. chemical energy is the potential energy stored in the arrangement of atoms within molecules. breaking chemical bonds requires energy, while forming new chemical bonds releases energy.

the atp molecule can store energy in the form of a high energy phosphate bond joining the terminal phosphate group to the rest of the molecule. in this form,energy can be stored at one location, then moved from one part of the cell to another, where it can be released to drive other biochemical reactions.

quartz

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am i too late?

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