How many mL of stock solution of 2M NaCl do you need to prepare 100 mL of 0.150M NaCl?
Answer:
7.5mL
Explanation:
Comsidering the definition of dilution, 7.5 mL of the stock solution of 2 M are required to prepare 100 mL of 0.150 M solution.
Dilution is a procedure by which the concentration of a solution is lowered. It is achieved by adding more solvent to the same amount of solute.
Then the amount of solute does not vary, but the volume of the solvent does: when more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volume
In this case, you know:
Ci= 2 M Vi= ? Cf= 0.150 M Vf= 100 mLReplacing in the definition of dilution:
2 M×Vi= 0.150 M×100 mL
Solving:
[tex]Vi=\frac{0.150 M x 100 mL}{2 M}[/tex]
Vi= 7.5 mL
In summary, 7.5 mL of the stock solution of 2 M are required to prepare 100 mL of 0.150 M solution.
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brainly.com/question/20113402?referrer=searchResults brainly.com/question/22762236?referrer=searchResultsMammals and plants don't belong in the same domain
Answer:
True
Explanation:
many people think they can live together they cant
Why is color NOT the best property to identify minerals A) different minerals can have the exact same colors B) all minerals have the same streak C) color can change due to impurities D) all minerals have one type of element
Answer:
b
Explanation:
gthtrhm xkcnsdvnsf
The main function of cell respiration is to produce A. glucose B. NADH and FADH2. C. CO2. D.mitochondria E. ATP.
Again No links thank you!
8. Which is true about viruses!
a. They are prokaryotic cells that infect living organisms
b. They are nonliving particles that infect living organisms
C. They are eukaryotic cells that infect living organisms
d. They are fungi that infect living organisms
Answer:
The Answer is gonna be A. They are prokaryotic cells that infect living organisms
This is the right Answer :3
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PLEASE HELP !! ILL GIVE 40 POINTS ; PLUS BRAINLIEST !! DONT SKIP ANSWER.
Answer:
b. 10,000 plants
Explanation:
Producers, plants, contain the most stored energy in an energy pyramid.
I hope this helped :)
the function of the secretion
Answer:
Secretion, in biology, production and release of a useful substance by a gland or cell; also, the substance produced. In addition to the enzymes and hormones that facilitate and regulate complex biochemical processes, body tissues also secrete a variety of substances that provide lubrication and moisture.
Explanation:
What is the relationship between UV radiation and melanin
Which of the following types of cells have cell walls?
A. Red Blood Cell
B. Nerve Cell
C. Cork Cell
D. Animal Cells
Answer:
cork cells
Explanation:
A cork cell has a cell wall that has a waxy substance that is impermeable to gases and water called suberin.
True
After the second melotic division, the cells are haploid as they have only one of each homologous
chromosome pair.
Answer:
True
Explanation:
After the second melotic division, the cells are haploid as they have only one of each homologous
chromosome pair.
what two spheres are interacting when ocean water evaporates into the air
1. geosphere
2. hydrosphere
3. atmosphere
4. biosphere
Evolution is a result of–
a. natural selection.
b. species not adapting quick
enough.
c. competition for resources.
d. harmful mutations.
Answer:
c
Explanation:
list the excretory organs of the human body and state the substance they excrete
Help please!! Louisa wants to find out whether earthworms prefer to live in the dark or in the light. She constructs an investigation. She fills a box with dirt and places 30 earthworms in the dirt. Then, she covers half of the box with a lid. She leaves the other half open. After waiting a week, what should Louisa do next? No links!!!
A. repeat the experiment
B. write a report to present to her science class
C. ask another question about the behavior of earthworms
D. count the number of earthworms that are present on each side of the box
Answer:
A is the answer because she have to answer again to make sure it is right
Beetles in a certain population can either be green color or brown colored. A change in the environment has caused the green colored beetles to become more visible and heavily prayed upon by other animals. Because of this change in the environment, what will most likely happen to this beetle population.?
A. The number of brown colored beetles will increase
B. The green colored beetles reproduce at a faster rate
C. The green colored beetles will change their color to brown
D. The population of green colored and brown colored beetles will become extinct
Answer:
A. i think
Explanation:
if green is being prayed on more, than less green are gonna be produced and brown will become more prominent. if that makes sense.
Fibroblasts can be placed on thin sheets of silicone rubber. Under normal circumstances, fibroblasts exert sufficient tension on the rubber so that it visibly wrinkles. Explain how the ability of fibroblasts to wrinkle rubber would change if the cells were treated with a permeable form of C3 transferase, a toxin (from the bacterium Clostridium botulinum) that covalently modifies an amino acid in Rho. The modification renders Rho unable to bind to proteins that it would normally bind to when active.
Answer:
C3 transferase decreases Rho activity and contractility by decreasing the number of stress fibers and thus also reducing wrinkles
Explanation:
Rho protein is a small GTPase, i.e., an enzyme that binds GTP to hydrolyze it to GDP, which is known to mediate the formation of stress fibers and focal adhesion. Rho protein is involved in diverse cellular functions including, among others, adhesion, motility, and division by reorganization of the actin cytoskeleton. The bacterial toxin C3 transferase derived from Clostridium botulinum is able to lock Rho in an inactive state. C3 transferase adds an ADP-ribose to Rho, thereby leading to the accumulation of a Rho-guanine nucleotide dissociation inhibitor (GDI) complex in the cytoplasm. In consequence, C3 transferase functions to decrease contractility by blocking Rho activity, decreasing the number of stress fibers and leading to a reduction in wrinkles.
When a Pp-genotype plant is bred with a pp-genotype plant, what percentage of the offspring is likely to have white flowers?
One scientist kept 20 grams of a radioactive material in a container. What will be the
mass of the radioactive material left in the container after 2 half lives?
40 grams
4 grams
10 grams
5 grams
After one half-life, there would be 10 g of the material left.
After two half-lives, there will be 5 g of the material left.
Therefore, 5 grams is the correct answer.
What is the unit of grams?The basic unit of mass or weight in the metric system is the gram. The most frequently used units of mass or weight used in the Canadian food industry are the gram and kilogram. Some of the types of grams are:-
Unit Abbreviation Mass (Weight)
kilogram kg 1000 grams
hectogram hg 100 grams
decagram dag 10 grams
gram g 1 gram
Therefore, last option is the correct answer.
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PLS HELP WILL GIVE BRAINLIEST need answers by today!
Which of these is NOT large and gaseous?
A) Jupiter
B) Mercury
C) Saturn
D) Uranus
Answer: B) Mercury
brainliest?
Explanation:
How are Killer Whales like the Wolves of the Rocky Mountains? And is this innate or instinctive behavior?
Which of the following is a 5-carbon sugar?
Glucose
Fructose
Ribose
Sucrose
Answer:
ribose
Explanation:
Answer:
Ribose & deoxyribose sugars. Ribose is a single-ring pentose [5-Carbon] sugar.
PLEASEE HELP ME!!! :]
what are 2 characteristics of s waves
Explanation:
s waves are shear waves. they move by material flexing or deformity sideways from the direction of waves travel
4. Identify the compounds your cells can break down to obtain energy.
Answer:
glucose and oxygen which ultimately get transferred into ATP.
Explanation:
Both prokaryotic and eukaryotic cells use ________ to turn certain genes on or off.
Group of answer choices
RNA polymerase
enhancers
activators
Both prokaryotic and eukaryotic cells use RNA polymerase to turn certain genes on or off. The correct option is A.
What is RNA polymerase?RNA polymerase, or more specifically DNA-directed/dependent RNA polymerase, is a molecular biology enzyme that synthesizes RNA from a DNA template.
The RNA polymerase enzyme is a large complex composed of many subunits. The prokaryotic RNA polymerase has four subunits that can transcribing all types of RNA.
These enzymes in eukaryotes have eight or more subunits that aid in the attachment and processing of DNA during transcription.
RNA polymerase (abbreviated RNAP or RNApol), or more specifically DNA-directed/dependent RNA polymerase (DdRP), is a molecular biology enzyme that synthesizes RNA from a DNA template.
RNA polymerase is used by both prokaryotic and eukaryotic cells to turn genes on and off.
Thus, the correct option is A.
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i need some help on this.............
Answer:
a) Beaver-dam buildings → (iii) Pond floods
b) Forest fire → (i) New plants can grow because of an increase in sunlight on the forest floor
c) Lack of rainfall → (ii) Zebras migrate farther to find water holes
d) Invasive water plants arrive → (iv) Sunlight is blocked for native seagrasses
e) Grasshopper outbreaks → (v) Crops are wiped out along the prairie
f) Coyote disease decreases the population → (vi) Mice population explodes
Explanation:
a) Beaver-dam buildings → (iii) Pond floods
This is an example of how some species might produce damages in ecosystems. Beavers are known for their dams, where they hide from predators, find shelter, reproduce, and feed. With time, and as the beaver population grows, these dams get bigger each time. These animals keep cutting down trees and covering some wider areas that were inhabited previously by other species. The landscape changes, these areas get flooded permanently, most vegetation dye, the soil properties get altered, and just a few species can keep living there. The ecosystem changes.
b) Forest fire → (i) New plants can grow because of an increase in sunlight on the forest floor
This is an example of biological succession. Stable forests characterize as having big old trees that compete for light developing big canopies at heights. Poor light reaches the ground and allows some smaller species to grow. When a fire occurs, some of these trees might fall or disappear. These fire events open windows in the forest through which sunlight directly reaches the ground. Many new species can germinate and grow. There occurs a renovation of vegetable species in the forest and the consequent renovation of other living forms.
c) Lack of rainfall → (ii) Zebras migrate farther to find water holes
It is not unusual that some species need to migrate looking for food or water. In certain areas, seasonal differences are very sharp, and while some periods characterize as producing plenty of food and water, some others characterize as lacking them, dry seasons especially. Animals develop different strategies to face these moments. Zebras need to migrate to find a new source of water to ensure proper hydration.
d) Invasive water plants arrive → (iv) Sunlight is blocked for native seagrasses
A very known global environmental problem is the damage caused by invasive species. In a few words, exotic species arrive in a new area out of their native distribution range, establish, grow, adapt, and reproduce. These exotic species turn into invasive species when they overgrow, sharply increasing their reproductive rate. At this point, interaction with native species becomes harder, competing for resources such as space, light, food, shelter, water, among many others. Invasive species become such a good competitor that end by displacing native species. In the exposed example, invasive water plants arrive, and their population overgrows. They compete for light with native seagrasses and end by blocking it for them.
e) Grasshopper outbreaks → (v) Crops are wiped out along the prairie
This is an example of the prey-predator relationship. In this case, grasshoppers are the predators, and crops are acting as the prey. Whenever one of the population increases in size, the other one follows this increase, causing the decrease of the first one. When the first population decreases, the second one also decreases. In this example, grasshopper outbreaks, meaning an increase in predation rate over crops. Many more individuals are feeding on the crops, causing more damages to the plants´ population. Crops do not have enough time to recover, so they are wiped out.
f) Coyote disease decreases the population → (vi) Mice population explodes
This is also an example of the prey-predator relationship. In this case, coyotes are the predators, and mice are acting as the prey. As coyotes are affected by the disease, which causes a decrease in their population size, mice seem to be favored, as they are not predated. They have enough time to recover as a population and increase in size. Coyotes´population decreases in size, so there are many fewer individuals feeding on mice, and hence, the mice population increases very fast. It explodes.
1.Non-living things, such as a car, often show characteristics similar to those of
living organisms.
a) State which characteristic of a living organism matches each of the descriptions
linked to a car.
(i)
burning fuel in the engine to release energy...
[1]
(ii)
headlights that switch on automatically in the dark.
(iii) filling the car's tank with fuel..
. [1]
(iv)
release of waste gases..
-- [1]
b) Identify one characteristic of living things that is not carried out by a
car......
... [1]
Answer:
burning fuel in the engine to release energy...
[1]
Explanation:
i think
An example of a consumer in a pond ecosystem is...
A. a water lily
B. algae
C. a reed
D. a frog
In a pond ecosystem, the frog serves as a consumer. The correct option is D.
What is a consumer?Consumers are lifeforms that require food to produce energy. These organisms are known as heterotrophs, which means they must consume something else as food.
In a pond ecosystem, tadpole larvae of frogs, fishes, and other underwater animal life that eat green plants and algae are the primary consumers.
Thus, the correct option is D.
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1. What causes community resilience?
Answer:
Community resilience is the sustained ability of a community to use available resources to respond to, withstand, and recover from adverse situations. This allows for the adaptation and growth of a community after disaster strikes. Communities that are resilient are able to minimize any disaster, making the return to normal life as effortless as possible. By implementing a community resilience plan, a community can come together and overcome any disaster, while rebuilding physically and economically.
Explanation:
Explain the relationship between the Fossil Record and the Theory of Evolution.
(3 or more sentences)