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Although Rf values technically remain constant if the following are held constant: * solvent system * adsorbent * thickness of the adsorbent * amount of material spotted * temperature They are generally not used to identify an unknown substance specifically, since these factors are sometimes difficult to control. Most generally, during a chromatography experiment an unknown sample can be compared directly to a known sample simultaneously, i.e. they will have similar Rf values.
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When might it be helpful to identify an unknown element?
It is helpful to identify an unknown element when you are exposed to a lot of it. This element could be very dangerous to you.
Why would you never use the sour taste property to identify an unknown acid?
Because it might dissolve your tongue or poison you!
Why must you never taste an unknown acid or base?
No just an acid or base; you should never taste any unknown substance. An acid or base can cause chemical burns on contact. Many substances can be toxic as well and can make you sick or even be lethal in small quantities.
What dissolved substance in ground water might cause the water to have an unpleasent odor?
The substance in ground water might cause the water to have an unpleasant odor is "Sulfur".
Situation where you might use the iodine colorimetric test?
You can use idodine to identify starches in substances.
When might it be helpful to identify an unknown element?
It is helpful to identify an unknown element when you are exposed to a lot of it. This element could be very dangerous to you.
What difficulties might you encounter if you tried to identify an unknown substance using its boiling point?
You might make it explode or make some deadly gas. Research what you're doing before you perform an experiment.
Who might help you identify your values.?
Your values are embodied in what you practice daily. You might best come to more precisely define your values by auditing where your time goes for a week or so.
What relationship between the known and unknown do you need to solve the problem?
As part of planning, you might draw a diagram that helps you visualize a relationship between the known and the unknown. You might need to use a table or graph to identify data or to identify a relationship between a known quantity and the unknown. Hope that helps (:
How can you identify an unknown animal fur?
TO be totally sure, it could be DNA tested. Otherwise, a taxidermist might have a good guess.
Why would you never use the sour taste property to identify an unknown acid?
Because it might dissolve your tongue or poison you!
What values should be taken into consideration when developing codes of ethics?
Identify prevailing social values before addressing current issues in the school or workplace. Examples of ethical values important to society might include trustworthiness, responsibility, respect, empathy, fairness, and citizenship.
Can you determine the identity of an unknown substance by calculating its density and observing chemical reactions?
Yes. You can divide the mass by the volume to find its density. Density is a property that can identify a substance.* * * * *No, you cannot! Density is not a property that can identify a substance unless you know that it is pure.All you can do is with mass and volume is determine the density of the substance, which could be a mixture. For example, sodium has a density of 0.97 g/cc and osmium a density of 22.6 g/cc. These two metals can be combined in various proportions to give an alloy with a density with any value between the two given numbers. I am not sure how stable such an alloy might be but the point is that you could make an alloy with the same density as tin, or iron, or lead or bronze.
Can you determine the identity of-an unknown substance by observing its mass and volume?
No, you cannot. The mass and volume of an unknown substance will give you its density. Density is not a property that can identify a substance unless you know that it is pure but not if it could be a mixture. For example, sodium has a density of 0.97 g/cc and osmium a density of 22.6 g/cc. These two metals can be combined in various proportions to give an alloy with a density with any value between the two given numbers. I am not sure how stable such an alloy might be but the point is that you could make an alloy with the same density as tin, or iron, or lead or bronze or most other metals or metallic alloys that you care to name.
Can you determine the identity of unknown substance by observing its mass and volume?
No, you cannot. The mass and volume of an unknown substance will give you its density. Density is not a property that can identify a substance unless you know that it is pure but not if it could be a mixture. For example, sodium has a density of 0.97 g/cc and osmium a density of 22.6 g/cc. These two metals can be combined in various proportions to give an alloy with a density with any value between the two given numbers. I am not sure how stable such an alloy might be but the point is that you could make an alloy with the same density as tin, or iron, or lead or bronze or most other metals or metallic alloys that you care to name.
Does mars have water under ground?
This is currently unknown, but we guess it might as it has water ice at the poles and large valleys and canyons that have been clearly carved by water or a similar substance
Why must you never taste an unknown acid or base?
No just an acid or base; you should never taste any unknown substance. An acid or base can cause chemical burns on contact. Many substances can be toxic as well and can make you sick or even be lethal in small quantities.
