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Is freezing biological samples for storage a chemical or physical change?
Wiki User
∙ 12y ago
It is a physical change. Any change in state or temperature is only physical unless it causes the atoms in the molecules to separate or rearrange themselves. In the case of freezing a biological sample, the point is to preserve it as it is, so the change would only be physical.
Wiki User
∙ 12y ago
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What is a breaker used for in chemistry?
To prepare geological samples (or other big samples) for chemical analysis.
What is spike method in chemical analysis?
In chemistry, the spike method, more often called the addition method, is used to find the concentration of an analyte in a complex matrix. Examples of such matrices would be soil samples or biological fluids.
The density of an substance varies with samples of that substance?
that is false because a density is a physical property and as u know physical property can't be changed
Does mass affect freezing point?
Well, I did an experiment in class on this question. We used different amounts lauric acid and it turned out that the freezing point was pretty much the same for all the samples. So, in all, the freezing point does not depend on the mass of a substance.
What happens if you use a dirty pipet?
A test may become unfair or the chemical you're using may cause a chemical reaction
What are the different types of forensic science evidence?
biological, chemical, or physical samples -Hope this could help y'all in some way!
Why do you use Bunsen burners?
you use them for heating things (added) mainly used fot heating solutions for chemistry
What is chemistry health?
You think probable to chemical analysis of biological samples (blood, urine, etc.).
What is a microplate reader used for?
A microplate reader is a laboratory instrument which helps to detect chemical, physical or biological events samples in microtiter plates. These are most commonly used in research and drug discovery.
How is chemistry involved in the field toxicology?
# The determination of toxic materials in environmental samples or biological samples is realized with the methods of the analytical chemistry. # The neutralization/destroying of toxic materials is realized by chemical processes. # Antidotes are chemical compounds.
Samples of both properties physical properties?
Physical- Something PURE. Chemical- Something that contains OTHER things.
What sampling kit is used to collect soil liquid or small solid samples suspected of being contaminated by chemical or biological agent?
M34a1
Name two uses of distilled water?
- preparation of samples in analytical chemistry- all works in a chemical or biological laboratory- motor vehicles- preparation of drugs
Why feather samples weigh more than iron samples?
Because physical properties have a lot more resistance than chemical properties. Thickness is a physical property because it doesn't have reactivity. If I took a shoe and threw it at my friend, he would grow a bump on his head. That would be a physical property. The same thing applies here. A Feather is a chemical substance, and Iron is a physical substance. A Feather is more dense, and has less mass. Iron is less dense, and has more mass. The answer is simple: Different subsctances have different melting points and boiling points, therefore feather samples weigh more than iron samples.
Why is freezing used for preservation of tissue samples?
Because it stops the decaying process
What is a breaker used for in chemistry?
To prepare geological samples (or other big samples) for chemical analysis.
Why can samples of gold and copper have the same set of physical properties but not the same set of chemical properties?
They do not have the same set of physical properties. At the very least they have different melting and boiling points, and different densities, and their colors are not identical.
