Weight by volume is a concentration determining the method of the solution. 20 % w/v NaCl is prepared by mixing 3 gm in 15 mL.
What is concentration?Concentration is the amount of the solute or the solvent present in the solution. It can be calculated by molarity, molality, w/v, etc.
If the solution is 20% w/v then,( W ÷ 15 ) × 100=20
W = (20 × 15) ÷ 100 =3g
Hence, 3 gm NaCl must be added to 15 mL solution to make it 20% w/v.
Grams of NaCl for 35 % w/v is calculated as:( w ÷ 45) × 100=35
w = (35 × 45) ÷ 100
= 15.75 grams
Hence, 15.75 gm NaCl is required to prepare 45 gm solution.
Molarity is calculated as:Molarity = number of moles ÷ volume in litres
Given,
Moles = 0.289
Volume = 0.12L
Molarity = 0.289 ÷ 0.12 = 2.4M
Hence, 2.4 M is the molarity of 120 mL of ferric chloride solution.
Moles of sodium chloride is calculated as:Number of moles = Molarity × Volume in litres
Given,
Volume = 0.6 L
Molarity = 1.55 M
Substituting values:
Number of moles = 1.55 × 0.6 = 0.93Moles
Hence, 0.93 moles are present in 1.55 M solution.
Molarity of 63 gm NaCl is calculated as:Given,
Mass = 63 gm
Volume = 0.65 L
Molarity = mass ÷ (molar mass × volume)
M = 63 ÷ ( 58.44 × 0.65)
= 63 ÷ 37.98
= 1.66 M
Hence, 1.66 M is the molarity.
Mass of calcium carbonate from molarity is calculated as:Given,
Molarity = 1.66 M
Volume = 0.5 L
Mass of calcium carbonate = Molarity × molar mass × volume
1.66 × 100.0869 × 0.5 = 83.07 gm
Hence, 83.1 gm is mass required of calcium carbonate to make 1.66 M solution.
Volume of solution from molarity is calculated as:Given,
Mass of ferrous chloride = 130 gm
Molar mass of ferrous chloride = 126.751
Molarity = 0.88 M
Volume = mass ÷ (molar mass × molarity)
= 130 ÷ (126.751 × 0.88)
= 1.16 mL
Hence, 1.16 mL solution can be prepared.
The dilution formula is used to calculate the initial volume as:M1 = 3 M
M2 = 1.5 M
V2 = 70 mL
V1 is calculated as:
M1V1 = M2V2
V1 = (1.5 × 70) ÷ 3
= 35 mL
Hence, 35 mL of stock solution is required to prepare the 1.5 M solution.
The final volume to prepare the solution is calculated as:M1 = 6 M
V1 = 3 mL
M2 = 2 M
V2 is calculated as:
M1V1 = M2V2
(6 × 3) ÷ 2 = V2
= 9 ml
Hence, 9 mL is the volume of the desired solution.
The molarity of 17 mL solution is calculated as:Given,
V1 = 17 mL
M2 = 2.4 m
V2 = 65 mL
M1V1 = M2V2
M1 = (2.4 × 65) ÷ 17
= 9.1 M
Hence, 9.1 M is the molarity of the solution that is used to prepare 2.4 M solution.
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In which layer is lithification most likely to occur?
Answer:
Lithification is the process by which sediment turns into hardened rock. There are three ways in which lithification can occur. These processes are called compaction, recrystallization and cementation. It happens mostly in the subsoil.
Explanation:
Lithification is most likely to occur in sediments on the bottom of the ocean or other bodies of water.
What do you mean by lithification?Lithification is the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock. Essentially, lithification is a process of porosity destruction through compaction and cementation.
It refers to the process that loose and underconsolidated Sediment particles transform into hard and solid rocks. This process includes a number of geological processes, such as consolidation, deep bury, cementation, recrystallization and dehydration.
Sedimentary rocks are the product of 1) weathering of preexisting rocks, 2) transport of the weathering products, 3) deposition of the material, followed by 4) compaction, and 5) cementation of the sediment to form a rock. The latter two steps are called lithification.
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Fill in the blanks to complete each statement about igneous rock formation.
rocks form when
cools below Earth's surface.
rocks form when
cools on Earth's surface.
Plutonic or intrusive igneous rocks form when it cools below the Earth's surface.
Igneous rocks form when it cools on the Earth's surface.
How is the rock formation process?They originate from the solidification of magma inside the Earth's crust or when lava comes out of the mantle, through a volcanic eruption. When magma cools slowly inside the crust, turning into rock, a process called intrusion occurs.
With this information, we can conclude that Igneous rock or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic and Intrusive, or plutonic, igneous rock forms when magma remains inside the Earth's crust where it cools and solidifies in chambers within pre-existing rock.
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Answer:
intrusive, magma
extrusive, lava
Explanation:
edge
Which of the following is a mismatch?
A. Omethanogens - prefer anaerobic environments
B. thermophiles - live in extremely cold temperatures
C. thermoacidophiles - live in high temperatures and acidic environments
D. halophiles - live in high salt environments
Question 1 of 10
Which best explains how the human body obtains energy from food?
OA. By exhaling carbon dioxide
B. By breaking and reforming chemical bonds
C. By inhaling oxygen into the lungs
D. By removing dangerous wastes
SUBMIT
Answer:B
Explanation: this answer makes the most sense and is correct
Whats the correct answer answer ASAP for brainlist
Answer:
Australia
Explanation:
it is 2.968 million square miles, therefore making it the largest country in Oceania.
.
What happens during telophase of the cell cycle?
Chromosomes are pulled apart.
Chromosomes condense.
Chromosomes uncoil and the nucleus reappears.
Chromosomes line up.
The telophase of the cell cycle chromosomes uncoil and the nucleus reappears. That is option C.
What is telophase?Telophase is a stage of the cell cycle that occurs once the replicated, paired chromosomes have been separated and pulled to opposite sides, or poles, of the cell.
During the telophase stage, chromosomes arrive at opposite poles and unwind (uncoil) into thin strands of DNA, the spindle fibers disappear, and the nuclear membrane reappears.
Therefore, the telophase of the cell cycle chromosomes uncoil and the nucleus reappears.
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Mention some of the benefits of physical activities to prevent non-communicable diseases.
Explanation:
Regular physical activity helps prevent diseases such as reducing the risk of stroke, heart disease, cancers, high blood pressure, and osteoporosis. Moreover, physical activity helps ease stress and improves general wellbeing by boosting energy levels.
7 ways that invasive species affect the environment
Invasive species reduce biodiversity levels, create a nuisance, cause economic loss, and disrupt ecosystem equilibrium.
Effects of invasive speciesInvasive species tend to drive away or kill native species.Invasive species reduce the overall biodiversity of plants or animals in the ecosystem.They cause economic loss through the loss of important native species.They create nuisance in the environment and may be costly to get rid of.They affect ecosystem equilibrium by causing species change.They are usually difficult to manage.More on invasive species can be found here: https://brainly.com/question/21452505
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PLEASE I REALLY NEED HELP! THIS ASSIGNMENT IS DUE TODAY!!
Part D
If different masses of water are heated to the same temperature, which sample will absorb more energy? Base your argument on the definition of heat and what you learned from the experiment.
If different masses of water are heated to the same temperature, the sample that will absorb more energy will be the mass of water with the greatest amount of water mass, because the larger the material, the greater the amount of heat needed.
What is the specific heat of water?Water has a specific heat of 1 cal/g. ºC This means that the energy of 1 cal is required for a variation of 1 °C in 1 g of water.
With this information, we can conclude that Water's specific heat power is 4.2 joules per gram per Celsius degree or 1 calory per gram per Celsius degree.
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Name two cell components(parts) that bacteria and human epithelial cells have in common
Answer:
So first of all we have cell membrane salman green is an essential feature of all living cells. The next we have is genetic material in the form of D and E. This present in bacteria amoeba and epithelium sold as well. In addition to this cytoplasm, cytoplasm is also present in a bacteria amoeba and epithelium.
The cell components common in a bacterial and the epithelial cells are the cell membrane and ribosome.
Prokaryotic cells lack membrane-bound organelles like the nucleus, endoplasmic reticulum, and mitochondria while eukaryotic cells do; the only organelle that is present in both types of cells is the ribosome and the cell membrane.
Cell membrane is the gatekeeper of the cell as it check the entry and exit of the material in the cell. Eukaryotic ribosomes are significantly larger than prokaryotic ones, but both types of ribosomes perform the same task—protein synthesis.
Therefore, the bacterial cell and the epithelial cells have cell membrane and ribosome in common.
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What is the distance between Earth and the Moon?
364,000 km
384,000 light-years
364,000 light-years
384,000 km
Answer:
384,000 km or 238,900 mi :)
Have an amazing day!!
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In photosynthesis, water and carbon dioxide become
carbohydrates, in the presence of oxygen and light
light and oxygen, in the presence of carbohydrates
light, in the presence of oxygen and carbohydrates
oxygen and carbohydrates, in the presence of light.
Answer:
Photosynthesis
Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel. These primary producers form the base of an ecosystem and fuel the next trophic levels.
Explanation:
Can you tell me the question please so that I can solve that !?
c)Phage therapy may be considered the 21st century answer to combatting
bacterial infections. Discuss the potential merits and problems associated with
using this as a clinical treatment.
What are the pros and cons?
Answer:
Phages are currently difficult to prepare for use in people and animals.
It's not known what dose or amount of phages should be used.
It's not known how long phage therapy may take to work.
It may be difficult to find the exact phage needed to treat an infection.
Explanation:
In addition to the outer cell membrane, certain cells contain inner membranes
that surround the individual organelles. Which of the following explains why
the presence of internal membranes affords these cells an advantage over
cells lacking such structures?
25ual
ea
C
A. The synthesis of cell components to support internal membranes
increases the cell's energy expenditures.
O B. Compartmentalization keeps different functions separated within
the cell.
O
C. Proteins and other molecules can move more slowly between
organelles via a transport system than by diffusion.
© D. The presence of internal membranes causes cells to be larger,
decreasing the cell's surface-area-to-volume ratio.
The statement that explains the presence of internal membranes that affords these cells an advantage over cells lacking such structures is compartmentalization keeps different functions separated within the cell. Thus, the correct option is B.
What type of cells has an internal membrane?The eukaryotic cells have an internal membrane that separates the cell from the inner environment to the outer and provides a suitable condition for metabolic activity.
Internal membranes also furnish the process of compartmentalization which are responsible for maintaining the functions separated from the cells with respect to its organelles.
Therefore, the correct option for this question is B.
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Vincristine is a drug used to treat cancer. It prevents spindle fiber formation during mitosis. Which one of these events CANNOT occur due to
the usage of Vincristine?
-sister chromatid separation
-DNA replication
-chromosome coiling
-cytokinesis
Cytokinesis cannot occur due to the usage of Vincristine as it prevents spindle fiber formation during mitosis. The correct option is D.
Vincristine is a medication that prevents spindle fibres from forming properly during mitosis, which prevents the sister chromatids from being separated and being pulled to the opposing poles of the cell.
Sister chromatid separation cannot take place adequately in the absence of functioning spindle fibres, which prevents mitosis from progressing normally.
Vincristine, however, has no direct impact on chromosome structure or organisation, DNA replication, chromosome coiling, or any other cellular processes.
Vincristine use does not directly stop these processes, despite the fact that the disruption of mitosis may have an indirect impact on them.
Thus, the correct option is D.
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Your question seems incomplete, the probable complete question is:
Vincristine is a drug used to treat cancer. It prevents spindle fiber formation during mitosis. Which one of these events CANNOT occur due to
the usage of Vincristine?
A -sister chromatid separation
B -DNA replication
C -chromosome coiling
D -cytokinesis
What is A molecule ?
Answer:
molecule is a smallest particle in atom
Explanation:
don't know
Hsaio manages the finances for her company and has a particularly large amount of money budgeted for the purchase of calcium chloride, or cacl2. which type of company does hsaio most likely own?
Hsaio most likely own likely owns a catering company. calcium chloride is widely used in canned foods and vegetables.
Calcium chloride, a salt with the chemical formula CaCl2, is an inorganic substance. At room temperature, it is a white, crystalline solid that is very water soluble.Calcium chloride is a firming chemical that is used in the canning of vegetables, the firming of soybean curds into tofu, and the creation of a caviar alternative from fruit or vegetable juices. It is frequently utilized as an electrolyte in bottled water, sports drinks, and other beverages. The firming agent calcium chloride is commonly used in food to preserve pickles and other canned fruits and vegetables crisp and crunchy. The FDA recognizes calcium chloride it as generally safe.learn more about calcium chloride here:
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Phenylthiocarbamide (PTC), also known as phenylthiourea (PTU), has the unusual property that it either tastes very bitter or is virtually tasteless, depending on the genetic makeup
of the taster. There is a single gene which codes for a protein found in our tongues. PTC will bind with the protein if it present and a person will taste it. If the protein is not present,
PTC will not bind and a person cannot taste it. The ability to taste PTC is often treated as a dominant genetic trait. The dominant allele, T, causes a person to be able to taste PTC, and the recessive allele is represented as t. Assume that a population is in Hardy-Weinberg equilibrium and 16 individuals out of 100 are unable to taste PTC.
What are the allele
frequencies of T and t in this population?
A. The allele frequency of T is 0.80, and the allele frequency of t is 0.20
B. The allele frequency of T is 0.84, and the allele frequency of tis 0.16.
C. The allele frequency of T is 0.00, and the allele frequency of t is 0.40
D. The allele frequency of T is 0.50, and the allele frequency of t is 0.50.
Answer: a
Explanation:
A
The allele frequencies of T and t in this population are the allele frequency of T is 0.80, and the allele frequency of t is 0.20. Therefore, option A is correct.
What is allele frequency ?The relative frequency of an allele at a certain locus in a population, represented as a fraction or percentage, is known as gene frequency or allele frequency. The percentage of chromosomes in the population that carry that allele relative to the whole population or sample size is what is being discussed.
In human statistical genetics, the frequency of an allele in the population is a fundamental quantity. A lot of population and medical genetic studies are based on this amount. Allele frequencies are altered by numerous evolutionary factors. As a result, allele frequencies can be utilized to guess at previous evolutionary occurrences.
The distribution of genetic variation in a population is shown by the relative genotype frequencies. The fraction of all copies of a gene in a population that carry a certain allele is known as relative allele frequency.
Thus, option A is correct.
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The star in the diagram
represents which of
these?
A. origin of replication
B. replication fork
C. replication bubble
D. Okazaki fragment
Answer:
B.) Replication fork
Explanation:
The replication fork is the point at which two strands of DNA separate via DNA helicase.
The origin of replication is the site on a singular DNA strand where replication begins. Here, complementary nucleotides begin bonding to the single-stranded DNA via DNA polymerase.
The replication bubble is created when DNA helicase separates a DNA strand. The DNA helicase does not separate the entire strand, but rather opens only certain sections at one time. This creates a "bubble" in the DNA strand where replication will take place.
Okazaki fragments are formed on the lagging strand of the single-stranded DNA. Because DNA is only created from the 5' to 3' direction, RNA primase must reposition itself after adding a primer (made of nucleotides). DNA polymerase then fills in these fragments with more complementary nucleotides in small sections.
Answer: B. replication fork
Explanation:
What is responsible for production of a blood moon?
absorption of blue light by the Earth's atmosphere
absorption of red light by the Moon's atmosphere
absorption of blue light by the Moon's atmosphere
absorption of red light by the Earth's atmosphere
Answer:
Blood Moons happen during a total lunar eclipse. This occurs when the Earth moves between the Moon and the Sun, casting a large shadow on the Moon, putting the Moon in darkness.
Explanation:
hope it will help you
Archaeans are best known for being:
A. photoautotrophic
B. mixotrophic
C. Heterotrophic
D. chemoautotrophic
hikers who found a human body at high altitude in the italian alps thought the man had died recently but tests indicated he was shot with an arrow more than 5,300 years ago, which of the following would be the best reason for the prolonged preservation of the body? A. the ultraviolet rays at such a high altitude caused all the body molecules to be preserved. B. the food that the person ate contained toxins that killed the bacteria that would have otherwise destroyed the body. C. the arrow wound caused blood to flow out of the body.which led the enzymes that would break down tissue to be cleared from the body. D. the body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.
Which of the following allows the AIDs virus.which contains RNA, to insert into the DNA of a host of T-cells after the AIDs virus enters the cell. A. reverse transcriptase an enzyme encoded by the body. B. receptor proteins located on the surface of the virus c. the phospholipids found on the envelope of the virus. D. the protein that makes up the capsid of the virus.
Which of the following microorganisms lack their own metabolic pathways and can only reproduce inside of a host cell? A. bacteria. B. Helminths c. protozoa. C. viruses
Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell. A. lysosomes. B. cytokines. C. perforin . D. granzymes
The body was preserved because the body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.
How is a body preserved?It is common to observe that bodies are often preserved at a very low temperature hence the body was preserved because the body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.
The reason why the AIDs virus which contains RNA, to insert into the DNA of a host of T-cells after the AIDs virus enters the cell is because of receptor proteins located on the surface of the virus.
The organism that lacks the ability to maintain their own metabolic pathways and can only reproduce inside of a host cell are the viruses.
The chemicals released by one type of immune cell to directly activate another type of immune cell are the cytokines.
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____________feed on animal waste and debris
Answer:
I'M NOT TELLING YOU!Just kidding
Explanation:
They are called scavengers.Scavengers are those animals that feed on debris and animal wastes and such like that.Examples of scavengers:Vulture, Coyote, hyenas, jackals etc.Hope this helps.Good luck ✅.Compare and contrast cladistics and phylogeny. What are their advantages and disadvantages? Which is the most useful in understanding how an organism developed into its current form? Which concept most strongly supports your opinion about the origin of any given organism?
Cladistics categorizes organisms depending on the most recent common ancestor, whereas phylogeny analyses the history of the evolution of a given taxonomic group.
What is Cladistics?Cladistics is a subsystem of classification to organize organisms depending on the most recent common ancestor, which is based on observable (current) phenotypic/molecular features.
Conversely, phylogeny refers to how we interpret the relationships between organisms from an evolutionary point of view.
In conclusion, Cladistics categorizes organisms whereas phylogeny analyses the evolution of a given taxonomic group.
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If the supply of carbon dioxide stops in plant, what will happen to the process of
photosynthesis?
Answer:
All plants and animals on earth engage in a process called respiration. Respiration combines oxygen and the food created during photosynthesis to produce usable energy. One of the byproducts of respiration is CO2, this is the opposite of photosynthesis. It is not unusual for plants to stop taking in carbon dioxide to uptake small amounts of oxygen at night.
In the event that plants cease to take up CO2 all together, they will cease to convert sunlight into carbohydrates, and die. The death of autotrophs would lead to a chain reaction of the death of all higher order organisms. Mankind could survive on food stuffs on hand, but only for a very short time. It has been said that any western society, its members are just 3 meals away from revolution.
Social order would be completely lost during the initial food riots. Once the processed and packaged food supply is exhausted, it would be the law of the dying jungle. The strong and well armed would take from the weak and ill prepared. Livestock and game would be slaughtered as the next to the last food source disappeared. The shear volume of death would foul the water spreading pestilence and disease. In one or two years bands of humans would prey on other humans as they degenerate into cannibalism. There could be a few humans in protected bunkers and hideaways, but they too would eventually succumb to starvation or despair as the world died.
The fact that plants stopped converting CO2 into O2 would be of little consequence. Man would die of hunger 1000 years before oxygen was ever an issue.
A hunting and gathering society typically had
Opermanent living sites
O access to one crop
O a large stable population
O
a wide variety of food sources
Which organism has membrane-bound chloroplasts and nuclei?
a. Volvox
b. Euglena
c. Oscillatoria
d. a, b, and c
e. a and b only
Answer:
euglena because it is an eukaryoteWhat may occur when convergent boundaries interact?
formation of island chains
creation of mid-ocean ridges
creation of convection currents
formation of rift valleys
When convergent boundaries interact, the formation of island chains happens. The correct option is A.
What are convergent boundaries?
Convergent boundaries is the name given to those plates which collide with one other, and they may both go upside or one plate from beneath the other plate.
Convergent boundaries collide in three forms and for different types of landforms. The types are:
Ocean-oceanOcean-continentContinent-continent.When convergent boundaries interact, they create a chain of islands. When one plate moves over another, a hot plate erupts lava and forms volcanic eruptions.
Thus, the correct option is A. formation of island chains regarding when convergent boundaries interact.
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Answer: A, formation of island chains
Explanation: got it on edge
about blood groups of different individuals. What is the importance of these different blood groups?
Kwlalzlzlzllallslslsl
Lllala
Answer:
Antigens are genetically determined—inherited from a combination of your parents' genes. There are many different blood type systems, but most people will be familiar with the two main blood groupings—the ABO and Rh (or Rhesus) systems. These systems lead to the eight commonly known blood groupings.
blood group A – has A antigens on the red blood cells with anti-B antibodies in the plasma. blood group B – has B antigens with anti-A antibodies in the plasma. blood group O – has no antigens, but both anti-A and anti-B antibodies in the plasma. blood group AB – has both A and B antigens, but no ..
Explanation:
https://www.nhs.uk/conditions/blood-groups/
Hope this helps!!
Which of the following is true about the Moon?
A- The Moon has light of its own.
B- The Moon reflects the light of the Earth.
C-The Moon shines by reflecting the light of the Sun.
D-The Moon reflects the light of other stars in the sky.
Answer:
Your answer is C
Explanation:
Answer:
C
Explanation:
The moon reflects the light of the sun