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.
Which statement describes why natural populations cannons keep growing exponentially ?
A. Disease always affects large populations
B. Humans always disturb ecosystems
C. Resources are always limited
D. Natural disasters always control growth
Answer:
C resources are always limited
Explanation:
Best definition of bioluminescence
Answer:
bioluminescence : production and emission of light by living organism which occurs through a chemical reaction.
Explanation:
( can be found in marine animals, fungi, bacteria, and terrestrial arthropod)
which statement best describes the role of the plasma membrane in osmosis?
please help me
Answer:
The first statement
Explanation:
Osmosis is the transfer of water molecules from a low concentration to a higher concentration through a partially permeable membrane
The partially permeable membrane only allows water molecules to pass through
Therefore, the first statement best describes osmosis
Predict :What do you think the offspring of a red chicken and a white chicken will look like?
Answer: I predict that if they follow a dominant/recessive inheritance pattern, they will most likely be red.
Hope this helps!! :D
Answer:
I predict that if they follow a dominant/recessive inheritance pattern, they will most likely be red.
Explanation:
How is radioactive decay related to radiometric dating
Answer:
Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks.
Explanation: It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
Usually, an egg cell from a human female contains_________________.
Like a sperm cell, the egg contains a nucleus with half the number of chromosomes as other body cells.
(hope this helps ^^)
This one strawberry plant is sending out a runner that grows into another strawberry plant. What type of reproduction would this be? This one strawberry plant sends out a runner and another strawberry plant begins to grow. What type of reproduction is this?
a. sexual reproduction
b. asexual reproduction
c. neither, plants don't reproduce.
Scientists are studying the evolution of the sloth. They have fossils from 30, 20, 15 and 10 million years ago. Which fossil is most similar the the modern-day sloth? *
Answer:
30 million years ago
Explanation:
Sloths are slow moving animals and are also cute animals. These animals are mostly found in Central America and South America.
From many many million years sloths have lived on this planet. Sloth have evolved from elephant size to moose size in the past few million years. But scientist have known very little about their nature and about their species.
There are about many fossils from 30 million years to 10 million years but recently scientist have discovered that the fossils of sloth from the 30 million years ago are similar to the modern day sloth.
Through which material would sound travel the fastest?
A. air
B. water
C. steel
D. sponge
Answer:
A
Explanation:
A red blood cell is 8 um in diameter.
A bacterial cell is 40 times smaller.
Calculate the diameter of the bacterial
cell.
Tick one box.
0.02 um
0.2 um
2.0 im
20.0 cm
Answer:
0.2um
Explanation:
take each of the answers multiply by 40 and see which the answer is 8um
0.2×40=8um
The diameter of the bacterial; cell would be 0.02 micrometer therefore the correct answer is option A.
What is the scale factor?It is defined as the multiplication factor used for the design of an object with respect to some other object. the scale is generally used to design prototype designs of large objects.
It is multiplied by the design dimension to get the actual size of the object or product.
As given in the problem A red blood cell is 8 micrometers in diameter. If a bacterial cell is 40 times smaller, then we have to calculate and calculate the diameter of the bacterial cell.
scale factor = 40
diameter of the bacterial cell = 8 micrometers/40
= 0.02 micrometers
Thus, the correct answer is option A.
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The area labeled X is known as
A.
an atomic nucleus
B.
an active site
C.
a pH indicator
D.
a temperature regulator
ecule
An active site is the area at where the enzyme gets attached. The are labelled X is known as an active site.The correct answer is option B.
What is an atomic nucleus ?An atomic nucleus is the central region of the atom at which the number of protons and neutrons are in abundance. The charge carried by the nucleus is positive in nature.
The picture shows the lock and key method where it is the relation between enzyme and substrate where the enzyme and substrate are almost same in shape where the lock is the substrate where the enzyme is of key shaped and they both fit in.
An active site is the region of the reactant or substrate where the enzyme will bind in and the reaction will form a product. The binding of both the constituents depend on the binding energy and activation energy of the reaction.
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How many amino acids are present in a protein that requires 3,000 bases in its code?
What type of molecule forms the antibodies found in the human immune system?
Answer:
An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shaped protein produced mainly by plasma cells that is used by the immune system to neutralize pathogens such as pathogenic bacteria and viruses.
What does an organism's genotype describe?
the allele combination for a trait
the physical appearance of a trait
the number of alleles on a gene
the number of different traits inherited
Answer:
the allele combination for a trait
Explanation:
The genotype describes which alleles (versions) of a gene an organism has. Diploid organisms, such as humans, have two copies of each gene. Sometimes these alleles are the same and the individual is h0m0zygous for that gene. If they are different, the individual is heterozygous for that gene.
The physical appearance of a trait is the phenotype.
Answer:
The answer is A.
Explanation:
I don't know for sure but I will come back and tell u if it is right after my quiz...
I need help with this IMMEDIATELY I will give 20 points and give a brainliest answer if someone answers it. PLZ HELP ME NOW!!! WITH BIOLOGY!!!
Which of the following hazards oan severely harm a worker's lungs?
A. excessive noise
B. heat exposure
C. vehicle hazards
D. bins and silos
Answer:
I think that this might be your answer :) I tried hope this helps !
Explanation:
A) Heat exposure Because In terms of weather Heat: Inhaling hot air, induces airway constriction making it difficult to breathe.
Also Of course, it's known that smoke from fire can have a terrible effect on your lungs. It can restrict oxygen flow, which can and most likely be deadly. So the exposure to the heat will distract them cause they cant breath while they work .
What provides the set of guiding principles for managing wildlife resources?
Seven Rules for Fair Chase
Seven Sisters of Habitat Reconstruction
North American Free Trade Agreement
North American Model of Wildlife Conservation
Answer:
North American model of wildlife conservation
Explanation:
North American model of wildlife conservation provide the guiding rules because it was created in the 19th century to provide set of building rules to guide the management of wildlife and conservation in the United States and Canada on the best decisions to take in wildlife management.
It was created due to increase in Extinction of wildlife species and increase in sportsmen.
The correct answer is The North American Model of Wildlife Conservation provides a set of guiding principles for managing wildlife resources, which is the last option, as the North American Model of Wildlife Conservation is a framework that originated in North America and is widely recognized as a successful approach to wildlife management.
Wildlife belongs to all citizens and is managed by government agencies on behalf of the public. The model promotes the elimination of market hunting and the commercial exploitation of wildlife. Wildlife resources are allocated and regulated through laws and regulations to ensure equitable access and sustainable use.
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The composition of the matrix of the connective tissue, which is present in between two bones is:
(a) calcium and phosphorous
(b) proteins and sugars
(c) calcium and proteins
(d) salts and hormones
Answer:
es la( a (
Explanation:
Which of the following is true of DNA and RNA nucleotides? (4 points)
Both contain a sugar and a cytosine nitrogenous base.
Both contain a sugar and thymine nitrogenous base.
Both contain deoxyribose sugar and uracil nitrogenous base.
Both contain ribose sugar and cytosine nitrogenous base.
Answer:
Both contain a sugar and a cytosine nitrogenous base.
Explanation:
DNA and RNA are both nucleic acids. However, the nucleotides bases) that make up each molecule have slightly different structures.
DNA stands for deoxyribonucleic acid because the sugar in the nucleotides is deoxyribose sugar.
RNA stands for ribonucleic acid because the sugar in the nucleotides is ribose.
DNA contains the bases cytosine, guanine, adenine, and thymine.
RNA contains one base different, it has cytosine, guanine, adenine, and uracil.
Therefore, they contain different sugars, but they both contain a cytosine nitrogenous base.
rocks are classified into three major groups what are they
Answer:
There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle. Sedimentary rocks are formed from pieces of other existing rock or organic material.
Explanation:
What property of electric current allowed Edison’s first light bulb to light?
Answer:
Electric current – The net movement of electric charges in a single direction through a wire or conductor. Voltage difference – The force that causes electric charges to flow; charges flow from high voltage to low voltage
Explanation:
Answer:
Explanation:What property of electric current allowed Edison's first light bulb to light? Electric current – The net movement of electric charges in a single direction through a wire or conductor. Voltage difference – The force that causes electric charges to flow; charges flow from high voltage to low voltage.
Which of the following is true about the structure of DNA and RNA?
A. DNA and RNA have the uracil nitrogen base.
O
B. DNA is single stranded and RNA is double stranded.
O
C. DNA and RNA have a deoxyribose sugar.
O
D. DNA has thymine and RNA has uracil.
Answer:
Dna and RNA have a deoxribose sugar
The statement (D) is correct. DNA has thymine and RNA has uracil.
What is DNA and RNA?DNA and RNA are both types of nucleic acids, large molecules that are made up of monomers called nucleotides. Nucleic acids are used to store genetic information, which the cell uses to make proteins.
Moreover, nucleic acids, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), carry genetic information which is read in cells to make the RNA and proteins by which living things function. The well-known structure of the DNA double helix allows this information to be copied and passed on to the next generation.
Hence, DNA is a double-stranded molecule that has a long chain of nucleotides. RNA is a single-stranded molecule which has a shorter chain of nucleotides. DNA replicates on its own, it is self-replicating. RNA does not replicate on its own.
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If there was 26% Adenine, how much thymine would there be
Answer:
26%
hope it help you ....
Label the model to show the process of photosynthesis.
Answer:
Starting at the top where the line is pointing at the green thing going right.
O2SugarChloroplast Calvin cycle CO2H2OGranum ADPRadiant EnergyExplanation:
The steps of the process of photosynthesis are:
oxygenSugarChloroplastCalvin cycleCarbon dioxidewaterGranumADPRadiant EnergyWhat is photosynthesis?Photosynthesis is the process of converting light energy into chemical energy. It occurs in the organism containing chlorophyll because chlorophyll traps the sunlight for the reaction.
The steps included in the photosynthesis are added in the image below
Thus, the steps of the process of photosynthesis are:
oxygenSugarChloroplastCalvin cycleCarbon dioxidewaterGranumADPRadiant EnergyLearn more about photosynthesis, here:
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how does DNA polymerase prevent mutation?
Answer:
It checks DNA for errors during replication.
Explanation:
Hope this was helpful.
Answer: It checks DNA for errors
Explanation:
A-pex
will give brainlist
Convergent plates move _________ each other. This causes _______ to form as well as volcanoes.
A.
toward, mountain ranges
B.
away from, volcanoes
C.
toward, rifts
D.
away from, mountain ranges
Answer:
A.
toward, mountain ranges
Explanation:
In order to replicate behavior, one must retain it in memory. True or false?
Answer:
True
Explanation:
"One must retain behavior in memory in order to duplicate behavior," is a true statement.
What is a long term memory?Memory can be divided into two distinct classes: short-term and long-term.
After the information has been encoded in the appropriate manner, it is stored in the long term memory for use at a later time. As a consequence, the assertion that "in order to repeat behavior, one must retain it in memory" is validated as being correct.
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Human cells have 46 chromosomes. Each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere. Once the chromosome has split, each chromatid is called a daughter chromosome. At the end of cytokinesis, how many daughter chromosomes will be found in each cell? Explain.
Answer: 2
Explanation:
Each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. Human cells have 46 chromosomes. Each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.
At the end of cytokinesis, there will be 46 daughter chromosomes in each cell.
MITOSIS:Mitosis is the type of cell division that results in two daughter cells that are genetically identical to one another. According to this question, human cells possess 46 chromosomes, which divides during mitosis into daughter chromosomes called chromatids.Therefore, after cytokinesis, 46 daughter chromosomes will be present in each cell in order to maintain the chromosome number of the parent cell.
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le Which two structures produce energy that cells can use? A and B, B and C, C and D, D and A
Answer:
Your answer would be: D. D and A.
Explanation:
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