You have two pure substances that you cannot identify each sample is solid at room temperature describe at least five steps in the appropriate sequence that you would take to be able to identify the substances
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 may indicate 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.
what makes the red blood cell special, why is it special, how is it different than other cells, what is its primary function. (Minimum 5 sentences)....Please help
Answer:
not sure If I can make 5 sentences but I can help by telling you that it delivers oxygen and energy throughout the body through the bloodstream which is a given but there ya go
Which of the following is NOT a category that is used to describe soil?
A. density
B. particle size
C. absorbency
D. texture
The recessive trait will always been seen.
Answer:
Not always.
Explanation:
Answer: False
Explanation:
What does a planet need in order to retain an atmosphere? How does an atmosphere affect the surface of a planet and the ability of life to exist?
Call to help me on
+233559259636The mother has long fur:
(FF)
F= long fur
The father does not have long fur:
(ff)
f=short fur
Answer:
are you looking for a pedigree, or a square pedigree?
Explanation:
PLEASE ANSWER WILL GIVE OUT BRAINLIEST!
Answer: I'm willing to help but, I can't see the screenshot.
In terms of producers, why is cellular respiration needed in
addition to photosynthesis?
How are photosynthesis and cellular respiration similar
(Hint: look at the inputs/reactants and outputs/products)?
How are photosynthesis and cellular respiration different
(Hint: look at the inputs/reactants and outputs/products)?
ANSWER THIS FAST FOR ME!!!
Answer:
Option A.) 22; 4
Explanation:
HELP FOR A HOMIE PLS
Answer:
c
Explanation:
While viruses are not living organisms, they do share some characteristics with living organisms such as bacteria and fungi. Which of the following describes a characteristic that viruses have in common with living organisms?
A.
Viruses cannot reproduce without infecting living cells.
B.
Viruses contain genetic information in the form of DNA or RNA.
C.
Viruses are not made up of cells.
D.
Viruses do not have any energy requirements.
Answer:
B
Explanation:
which of these methods of waste management is most likely to release heavy metals and other toxins into the air?
Answer:
havy toxins
Explanation: Becuse the air force is verrythick combined with the H20
Answer:
Incinerating.
Changes in inherited characteristics can cause a species to change into a new one. This change over time is called?
Answer:
Evolution
Explanation:
Evolution is the change in the inherited traits of a population from generation to generation. Mutations in these genes can produce new or altered traits, resulting in heritable differences (genetic variation) between organisms.
Which of the following is true about self-disclosure?
It involves sharing secrets and gossip about friends and acquaintances.
It mostly involves story telling.
It is a key element in unhealthy communication.
It involves sharing feelings and information as a means of getting to know a
person
Answer:
Explanation:
it involves sharing feelings and information as a means of getting to know a person
Once the problem has been identified, observations have been made, and research has been completed to learn about a problem, what is the next step in the scientific method?
Answer: Conclusion
Explanation:
Scientific method can be defined as a detailed plan for conducting research in a particular scientific domain. This is used to give scientific explanation for natural phenomena. In scientific method a hypothesis is created, observation is made, experimentation is conducted and then finally a conclusion is made to address the hypothesis.
Therefore, after the research is completed the conclusion is made by analyzing all the facts related to the literature and results of the experiments.
I need biology help can someone pls help me I Will give brainliest
Answer:
pripriw bruh or not bruh
What is the jellylike interior of the cell called?
A: mitochondria
B: cell wall
C: cytoplasm
Answer:
The answer is A
Explanation:
pls only legit answers im gonna fail this class
While gutting a fish, Nathan encountered an air-filled sac-like structure. What is the purpose of this structure in fish?
A.
It enables fish to breathe in water.
B.
It serves as a reserve space to store fat.
C.
It harbors bacteria that benefit the fish.
D.
It provides buoyancy to the fish.
Are enzymes reactants? Explain your answer.
Which of the following makes up the bottom layer of a soil profile?
organic material
Obedrock
O minerals and organic material
O inorganic materials
Answer:
inorganic materials
Explanation:
Answer:
Bedrock
Explanation:
your welcome
How can we differentiate between daughter cells, parent cells according to their genetic material?
Answer:
idk, wait a minute and i search the question in internet and i tell u the answer
Answer:
In mitosis, parental cells and daughter cells are identical, while in meiosis the daughter cells possess half of the chromosomes of the parental cells and recombined genetic material.
Explanation:
Eukaryotic cells have two types of cell division, mitosis for somatic cells and meiosis for sex cells or gametes.
In mitosis, two daughter cells identical to the original one originate from a diploid cell. It is the division on which the growth, development and repair of tissues depend. Meiosis implies a reductive cell division, so from a diploid cell haploid daughter cells, called gametes, are originated. In addition, in meiosis, recombination of genes occurs through crossing over.There is no difference between parental cells and daughter cells in mitosis, but daughter cells in meiosis have half the chromosomes of the original cell and their genetic material is recombined.
Who knows how to do this?
Answer:
respritory and immune
Explanation:
took the test
Answer: 6. the first one ,the third one ,
Explanation:
7.immune or respitory since her breathing is fast
Which statement best describes a population at, or
near, its carrying capacity?
A. The birth and death rates of the population are
approximately the same.
B. The birthrate of the population is declining
significantly
C. The overall population is increasing
de exponentially.
D. The overall population is increasing logistically.
Answer:
A. the birth and death rate of the population are approximately the same.
Explanation:
when when a population reaches carrying capacity, the population stabilizes until some sort of an outside situation changes.
Two different unicellular organisms are examined Scientists find that Species X always produces lactic acid during cellular respiration. Species Y always produces ethyl alcohol and carbon dioxide. Which conclusion can be made from these observations?
a)Species X is anaerobic, and Species Y is aerobic
b)Species Y is anaerobic, and Species X is aerobic
c)Both Species X and Y are aerobic
d)Both species X and Y are anaerobic
Answer:
a)species x is anaerobic, and species y is aerobic
I don't know/think my answers are right I also don't know the others please help and tell me if I'm wrong
A mineral forms from water at the edge of a lake.
PLEASE ANSWER I ONLY HAVE 2 MINS LEFT
Which statement best describes this mineral?
The mineral formed from lava.
The mineral formed through evaporation.
The mineral formed when hot water cooled.
The mineral crystallized from magma.
Answer: B) The mineral formed through evaporation!
Hope this helps!!! :)
Why are cells specialized?
Answer:
Specialised cells have a specific role to perform. Each specialised cell has a different job to do. They have special features that allow them to do these jobs.
Plz answer quick 20 points! WILL GIVE BRAINIEST! Answer correctly! 2 questions!!!!
Answer:
I think both of them are C
Explanation:
I’m sorry if I get one wrong I was trying to be quick about it
Researchers use all of the following to study the impact of heredity on behavior except
A. family
B. peer
C. adoption
D. twin
Please select the best answer from the choices provided
Answer:
B. Peer
Explanation:
When looking at studies relating to the heredity of traits we want to see if the child got a trait from the parents and their genes or from the way the child grew up with the parents. That means that peers are not useful to us in those studies. Family is very useful since we need to look at the family and how it raises a child. Adoption is useful to see if an adopted child has the same traits as a biological child. And twins are useful if they grew up in different circumstances from one another.
Answer:
B is correct
Explanation:
State Newton's 2nd law of Motion:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Answer:
The force acting on an object is is equal to the mass of that object times acceleration.
Explanation:
Here is the formula to calculate force: F= ma
