1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Rama09 [41]
3 years ago
11

You have two pure substances that you cannot identify each sample is solid at room temperature describe at least five steps in t

he appropriate sequence that you would take to be able to identify the substances
Biology
1 answer:
lapo4ka [179]3 years ago
3 0

Answer:

Explanation:

If we have two solid samples, in order to identify what they are a series of ordered steps have to be performed.

1) The first thing to do is to observe the sample. If there is color it <u>may indicate</u> the presence of certain anions: for example if the sample is purple, it can be because of the presence of the permanganate ion (MnO₄⁻), if it is yellow it can be chromate ion (CrO₄⁻), if it is orange it can be the dichromate Cr₂O₇²⁻), etcetera. If the color of the sample is white we have no indication whatsoever.

2) Then we can use certain reactants to precipitate the cations of the sample. For example, we can add first HCN 3N to our sample. If there is precipitation, it means that the cations Ag⁺ or Pb²⁺ are present. If not, there are other cations and we must use a different reactant to precipitate them.

3) We then add H₂S to the sample (not adding it per se, but generating it heating thioacetamide with water). If we see a black precipitate, it can be because of the cations Pb²⁺, Bi³⁺ or Cu²⁺. If we see a yellow precipitate, it corresponds to Cd²⁺. If we do not see a precipitate, we need to add other reactant.

4) We add NaOH to the sample. If we see precipitate, it can be because of the the ions Fe³⁺, Ni²⁺, Co²⁺ or Mn²⁺.

5) We observe the color of this precipitate. If it is brown is Fe(OH)₃, if it is green is Ni(OH)₂, if it is pink is Co(OH)₂, and if it is white is Mn(OH)₂.

Se toma la muestra problema o alícuota y se añade HCl 2N. Con este reactivo precipitan los cationes del Grupo I ( Plata (I), Plomo (II) y Mercurio (I)): AgCl, PbCl2 y Hg2Cl2. Sobre el mismo embudo se añade agua de ebullición, quedando en el papel de filtro el AgCl y el Hg2Cl2; el Pb2+ puede identificar añadiendo KI, que origina un precipitado de PbI2 que se disuelve en caliente, que sirve para identificarlo mediante la llamada lluvia de oro.1​

Sobre el mismo papel de filtro se añade NH3 2N. En el papel de filtro si existe Hg22+ y se forma una mancha blanca, gris o negro, que es una mezcla de HgClNH2 y Hg0. En la disolución se forman Ag(NH3)2+, que se puede identificar con KI dando un precipitado de AgI amarillo claro.

You might be interested in
two cats are mated. one of the parents cats is long haired(recessive allele). The litter which results contains two short haired
Mekhanik [1.2K]
The other cat has (I dont know what letters your using so I'm going to use 'c'.
The first genotype looks like this cc
the other Parent has to have a donomint trate as well as the recessiv Cc




7 0
2 years ago
A strain of bacteria has a CRISPR-Cas system, but a mutation has destroyed the function of the Cas9 gene. How will the strain of
bogdanovich [222]

If mutation destroys the function of the Cas9 gene then the bacteria will not be able to target a specific bacteriophage for destruction upon infection for the second time.

<h3>What is the Cas9 gene?</h3>
  • Cas9 is a 160 kilodalton protein that plays a vital role in the immunological defense of certain bacteria against DNA viruses and plasmids and is heavily utilized in genetic engineering applications.
  • Its main function is to cut DNA and thereby alter a cell's genome.
  • Although Cas9 is an endonuclease and is evolved as a mechanism of immunity against viruses, they are not considered restriction enzymes.

To learn more about the Cas9 gene,

brainly.com/question/22549100

#SPJ4

7 0
2 years ago
Which of the following is true about the Earth’s atmosphere?
azamat
Two of the above are true
4 0
2 years ago
Is a stage of infection in which there is few or NO
Lana71 [14]

i think the answer should be asymptomatic

8 0
3 years ago
Read 2 more answers
Which words list the correct order of activated neurons in a reflex arc? effector, receptor, sensory, interneuron, motor recepto
balandron [24]
B: receptor, sensory, interneuron, motor, effector
6 0
3 years ago
Read 2 more answers
Other questions:
  • 7. As plants like corn made their way
    9·1 answer
  • Scientists often use fruit flies as a method to test hypothesis about human genes. Why are fruit flies advantageous in the study
    13·1 answer
  • What is the boiling point of 2 cups appear tap water with 2 tablespoons of salt
    15·1 answer
  • All plants and animals in a food chain use energy. Where does this energy start from?
    11·2 answers
  • active transport occurs in cells for example when Na-k pump is at work.Any process that involves active transport most often inv
    9·1 answer
  • Which of the following is not part of Earth's physical systems? *
    12·1 answer
  • A dependent variable is:
    7·2 answers
  • Which cell structure plays a direct role in the release of chemicals from the cell?
    9·1 answer
  • yellow flowered plant is crossed with red one; some of the offspring had orange color phenotype . explain what happened?​
    12·1 answer
  • EXPERT HELP: I'LL GIVE BRAINLIEST:
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!