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n200080 [17]
3 years ago
7

Methods scientists use to determine if a change is chemical or physical?

Chemistry
1 answer:
vagabundo [1.1K]3 years ago
3 0

Answer: It if it chemical they can see if it formed solid or gas. For physical Shape, temperature and finally color can be a sign of both physical and potentially a chemical change.

Hope that is what they were looking for. Good luck and I hope this helps :)

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The reaction described in part a required 3.77 l of magnesium chloride. what is the concentration of this magnesium chloride sol
katrin [286]
Assuming you are talking about the atomic mass of magnesium chloride
M = n/V
M = 1/3.77
M = .265


6 0
3 years ago
explain why particles of colloidal solution donot settle down when left undisturbed , while in the case of suspensions they do .
Leni [432]

Answer:

the partial of colloidal are smaller and they are not heavy whereas the partial of suspension are larger but they are heavy and less movement thus they settle down due to gravity

7 0
3 years ago
Explain why some nuclei cannot experience magnetic resonance and give two examples. ​
zhenek [66]

Answer:

Any nucleus that has an overall spin quantum number of zero (I=0) is NMR inactive

Explanation:

A wide range of nuclei are found to be NMR active. NMR is the acronym for nuclear magnetic resonance. It is a powerful spectroscopic tool which uses radio waves. The nuclear spin is described by the nuclear quantum number I and can take on values of; 0,1/2, 1, 3/2,2,5/2 etc.

Any nucleus that has an overall spin quantum number of zero (I=0) is NMR inactive e.g Carbon-12 and Oxygen-16 nuclei.

Commonly, all NMR active nuclei posses I ≥ 1/2, Hydrogen -1 , Carbon-13 and boron-11 are common examples of NMR active nuclei.

5 0
3 years ago
Plz helppp gotta pass this
adell [148]
Ok i help you answer these question
3 0
4 years ago
How many moles of Cs are contained in 3 moles of Cs3PO4?
Alenkinab [10]

Answer:

\boxed {\boxed {\sf 9 \ moles \ Cs}}

Explanation:

We are given the compound: Cs₃PO₄

According to the formula, 1 mole of cesium phosphate contains 3 moles of cesium, 1 mole of phosphate, and 4 moles of oxygen.

Therefore, there are 3 moles of cesium for 1 mole of cesium phosphate.

\frac {3 \ mol \ Cs}{1 \ mol \ Cs_3PO_4}

We want to calculate the moles of cesium in 3 moles of cesium phosphate, so we multiply the ratio by 3.

3 \ mol \ Cs_3PO_4 *\frac {3 \ mol \ Cs}{1 \ mol \ Cs_3PO_4}

3 *\frac {3 \ mol \ Cs}{1 }= 9 \ mol \ Cs

3 moles of cesium phosphate contains <u>9 moles of cesium.</u>

6 0
3 years ago
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