Answer:
The correct option is;
a. 11.21
Explanation:
The chemical equation for the reaction is;
NH₄OH ↔ NH₄⁺ + OH⁻
At the start of the reaction, we have;
NH₄OH ↔ NH₄⁺ + OH⁻
I [tex]{}[/tex] 0.15 0 0
C 0.15 - x +x +x
The [tex]k_b[/tex] = 1.78 × 10⁻⁵
Therefore, we have;
1.78 × 10⁻⁵ = [NH₄⁺][OH⁻]/NH₄OH = x²/(0.15 - x)
Which gives;
(0.15 - x) 1.78 × 10⁻⁵ = x²
x² + 1.78 × 10⁻⁵x - 2.67× 10⁻⁶ = 0
Factorizing the above equation online, gives;
(x + 0.00164294)(x - 0.00162514) = 0
Therefore;
x = -0.00164294, or x = 0.00162514
We use the positive result, which is x = 0.00162514 = 1.62514 × 10⁻³ = [OH⁻]
Therefore;
pOH = -log[OH⁻] = -log(0.00162514) = 2.789
pH + pOH = 14
Therefore;
pH = 14 - pOH = 14 - 2.789 ≈ 11.21089
The pH of a 0.15 M NH₄OH solution with [tex]k_b[/tex] = 1.78 × 10⁻⁵ = 11.21.
The pH of a 0.15 M NH₄OH solution with [tex]k_b[/tex] = 1.78 × 10⁻⁵ is approximately 11.21
pH value is the measure of acidic or base properties of a solution.
The answer to the given question is a. 11.21. It is explained as follows.
The range of pH value is between 0 to 14 in which value 7 is the neutral pH which is associate with water.
The water has no dominant properties of acid neither base.
The pH value below 7 is for acidic properties and for above 7 is associate with base properties.
The pH value of 0.15 M NH4OH solution is 11.21 as it displays strong base properties.
The correct answer is a. 11.21.
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Describe how cohesion and adhesion contribute to the upward movement of water through a plant.
Answer:
Cohesive forces makes molecules stick to become a mass. This force ensures that the water molecules stick together to form a mass. This enables water to fill the xylem which is a vascular bundle in plants.
Adhesion forces is what enables the water molecules which are now in form of a single mass to move upward in the columns of the cells for distribution of water and nutrients.
GRADE 8 BIOLOGY PLS HELP
Membrane proteins can serve a variety of key functions:
Junctions – Serve to connect and join two cells together.
Enzymes – Fixing to membranes localises metabolic pathways.
Transport – Responsible for facilitated diffusion and active transport.
Recognition – May function as markers for cellular identification.
recent studies in bone research indicate that using ultrasound on a broken bone can decrease the healng time by 25% which of these are the most basic levels of organization involved when a bone heals
Answer:
This question is incomplete, it lacks options. The options are:
A. Cells and tissue
B. Cells and organ system
C. Organ system and organism
D. Tissue and organ system
The answer is A. Cells and tissue
Explanation:
A fractured/broken bone is capable of healing with time, although the process can be time-consuming. What occurs during the process is that blood clots develop around the area of the broken bone in order to protect the fracture and supply cells needed for the repair of the broken bone.
The aggregation of these cells form a tissue, which is the repair substance needed for the joining of the broken fragments. This repair substance is called CALLUS, which is initially made up of cartilage but later changes into bone tissue.
Hence, the most basic levels of organization involved when a bone heals are the CELLS and TISSUES.
List 3 sources of evidence for the endosymbiotic theory.
Answer:
DNA, RNA, Ribosomes And Protien Synthesis.
The endosymbiotic theory states that mitochondria and chloroplasts in eukaryotic cells were once prokaryotes engulfed by an early eukaryote.
The lines of evidence for this theory include:
Both mitochondria and chloroplasts have their own DNA that resembles DNA from prokaryotic organisms (i.e., a circular DNA molecule).Both mitochondria and chloroplasts have bacteria-like ribosomes.Both mitochondria and chloroplasts have a double membrane structure, i.e. an inner membrane and an outer membrane.Mitochondria and chloroplasts have a similar size as prokaryotic cells.In conclusion, the endosymbiotic theory is a well-supported theory and states that mitochondria and chloroplasts were once prokaryotes that were engulfed by an early eukaryote.
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Complete these sentences using the terms anterior and posterior.
6 The heel is
to the toes.
7 The biceps are
to the triceps.
8 The hamstring is
to the quadriceps.
Question 5 (4 points)
Which is a correct statement regarding microscope use?
You should always begin with the lowest power objective lens.
This highest power objective lens is generally the shortest one.
You should always start with the highest power objective lens.
Once you center under low power, you will not recenter again.
Answer:
Once you center under low power, you will not recenter again.
Explanation:
The correct option would be that once you center under low power, you will not recenter again.
One can start focusing a slide using the x10 or x40 objectives, it does not have to always be the x10 objective and it is never advisable to start with the highest power objective. Also, the highest power objective lens is the longest and not the shortest one.
However, once the field diaphragm has been centered under low power, one does not need to center again but only to refocus.
The urinary bladder is located ____ to the pubis.
Use directional terms.
Answer: Posterioir would be your answer. :D
Explanation:
Are climate change models accurate enough for costal city infrastructure planning?
Answer:
Yes
Explanation:
In the past climate change models were not accurate as they mostly understated the problems which resulted in more damages caused due to inaccurate preparations. However due to new technological innovations, there has been availability and improvement in the tools such as satellites.
This has led to an increase in the accuracy of the climate change models and subsequent planning of costal city infrastructures.
Which of the qualities listed below explain why certain organisms are classified as indicator species? They are a primary food source for many other organisms B. They are very sensitive to environmental change. C. They can't easily escape pollutants D. All the above
Answer:
B. They are very sensitive to environmental change
Explanation:
Certain organisms like plants, animals and microbes are used to monitor pollution status of the environment. These organisms are called indicator species or bioindicators. They are widely used for pollution monitoring due to their sensitivity to environmental changes i.e. in the presence of a pollutant, they undergo morphological or physiological changes.
A common example of indicator species is the proliferation of algal species in a water body known as ALGAL BLOOM. They tend to grow excessively in the presence of pollutants in form of nitrates and phosphates which they use as nutrient.
What defect of the bony covering of the spinal cord is described by the following:
"Spinal cord and spinal meninges are intact, neural arch of L5 and S1 is absent, spine of L5 is absent, median sacral crest associated with S1 is absent; site of defect is covered with skin with a tuft of hair"
Answer:
Las causas de los trastornos de la médula espinal son traumatismos, infecciones, bloqueo del aporte sanguíneo y compresión por un hueso fracturado o por un tumor.
Habitualmente, los músculos se debilitan o se paralizan, la sensibilidad es anormal o se pierde, y el control de la función de la vejiga y del intestino puede ser difícil.
El diagnóstico se basa en los síntomas y en los resultados de la exploración física y las pruebas de diagnóstico por la imagen, como la resonancia magnética nuclear.
Si es posible, se corrige la afección que causa el trastorno de la médula espinal.
Con frecuencia se necesita rehabilitación para recuperar el máximo de actividad posible.
La médula espinal es la vía principal de comunicación entre el cerebro y el resto del organismo. Es una estructura tubular, frágil y larga que parte de la base del encéfalo hacia abajo. La médula está protegida por los huesos de la espalda (vértebras) que forman la columna vertebral. Las vértebras están separadas y almohadilladas por discos de cartílago.
Explanation:
Human beings have described many of the animals they have encountered on earth. Roughly what portion of the animals that have been described are insects?
Answer:
Eighty percent
Explanation:
Insects have jointed legs, segmented bodies and exoskeletons. Insects are most documented and recognized species on earth. They are also the most diverse group of organism. There are around 900 thousand of insects living on Earth, it is almost eighty percent of all the known species. Insects belong to the class of phylum Arthropoda
The bronchi is located ____ to the lungs.
The ribs are located ____ to the lungs.
Use directional terms.
Explanation:
The bronchi is located medial
the lungs
the ribs are located anteriorly to the lungs......
[Please answer, thank you.]
Which variable is measured in an experiment?
dependent variable
experimental variable
independent variable
The Dependent variable is measured in an experiment. Thus, the correct option is A.
What is a Dependent variable?A dependent variable may be defined as a form of variable in experimental studies that never stands alone. The value of this variable significantly depends upon the independent variable.
The fluctuation in the independent variable may typically induce the dependent variable to be altered. It is the variable that is being measured or tested in a scientific experiment.
While the independent variable is one that stands alone in a given set of experimental studies descriptively. Its value does not depend on any sort of other variables. While the experimental variable is not frequently observed in any experimental analysis.
Therefore, the Dependent variable is measured in an experiment. Thus, the correct option is A.
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Where is the Oort cloud located?
O between the orbit of Mars and the orbit of Jupiter
O in the different orbits between the sun and Neptune
O beyond the Kuiper belt, at the farthest end of the solar system
all over the solar system and between the orbits of the planets
Answer:
Beyond the kuiper belt at the farthest end of the solar. on edgenuity 2020
Explanation:
Answer:
C
Explanation:
i took the assignment
39. Dan, who has sickle cell anemia, has Type B blood and needs a blood transfusion. Which of the
following people cannot donate blood to Dan?
A. Jill who has Type B blood
B. Tyrone who has Type O blood
C. Jane who has Type B+ blood
D. Lisa who has Type AB blood
Answer:
D.
Explanation:
Lisa whi has type AB blood can't donate.
if the force of gravity ___ , the weight of an object will __
Answer:
(increases,increases) or (decreases,decreases)
Explanation:
Answer:
increase and decrease
Explanation:
Many claims of pseudoscience are not refutable because they can’t be ____.
Answer:
Is there an answer bank?
Explanation:
I can't answer this without an answer bank
which two claims about cats are based on scientific ways of knowing?
Answer:
First claim '' cats are very smart animal''.
Second claim '' cats make bonds with humans''.
Explanation:
There are two claims that are scientifically proven about cats i. e. cats are very smart animal because they have highest number of neuron about 300 millions present in their brain which gives them the ability of intelligence and problem solving. They make emotional bonds with their owners just like dogs and can be trained by their owners so that's why many people make cat as a pet animal in their houses..
Where are nucleic acids made?
Answer:
Explanation:
Although first discovered within the nucleus of eukaryotic cells, nucleic acids are now known to be found in all life forms including within bacteria, archaea, mitochondria, chloroplasts, and viruses
A gecko is a type of reptile. How does a gecko most likely respond to cold air temperatures?
by shivering, which is in response to an internal stimulus
by shivering, which is in response to an external stimulus
by moving into the sun, which is in response to an internal stimulus
by moving into the sun, which is in response to an external stimulus
Answer:
by moving into the sun which is in response to an external stimulus
Explanation:
The geco will want to get warm as a result of the cold air which is an external stimulus so it moves into the sun
Answer:
dd
Explanation:
name four cycles that help to recycle matter in the biosphere
Answer:
Nitrogen cycle
Carbon cycle
Sulfur cycle
Phosphorus cycle
Explanation:
The material cycle refers to the pathway through which important materials in the biosphere take from their source of production to where they are utilized and back to their source of production. It can also be defined as the pathway by which important materials move between the living and non-living components of the earth.
The important materials include nitrogen, carbon, sulfur, phosphorus, etc. The cycles that help to recycle these materials are named according to the name of the material. Hence, there is a nitrogen cycle, carbon cycle, sulfur cycle, and phosphorus cycle respectively.
Scientist have many problems that they are working on but are unable to reach a useful solution. There are a number of constraints that can make problems unable to have a solution. Match the current scientific problem and the major constraint to finding a solution PLEASE ANSWER THE PICTURE ONLY ANSWER IF YOU KNOW THIS
Katy was tidying up around her apartment when she found bed bugs! She called her friend, Ms. Grant, who told her that she could spray an insecticide or put out sticky traps. Determined to decide which treatment is best, Katy tried both at the same time. She counted the bugs and then sprayed and laid out sticky traps. After one week, she counted the number of bugs she saw.
What are the constants of the experiment?
Answer:
The types of bugs ant the time
Explanation:
If you were to decide to remove outlying data points from you analysis what are two ways you could indicate this in your report to ensure you are being honest about you data analysis
Answer:
If the outlying data points are to be taken out from the report to guarantee the analysis of examination is right is to eliminate only if that isn't right or if there is enough data to check the data points once more.
One shouldn't eliminate outliers if the outcomes are critical and there are numerous outliers in data point. While eliminating the data points, one can trim the data points or change it with closest with mean or median.
When a substance or large molecule is enclosed by a membrane in a vesicle within the cell, the membrane of the vesicle fuses with the cell membrane and releases the substance out into the cell's surroundings. This is:
exocytosis
endocytosis
facilitated diffusion
osmosis
Answer:
Exocytosis
Explanation:
If you were looking through a microscope, how would you be able to tell if you were looking at a eukaryotic cell? Explain and/or draw your answer. Ready? Enter your answer here.
Answer: I would be able to tell if I was looking at a eukaryotic cell because you would see the cell structures, the specific functions it uses and you would be able to see the nucleus.(both prokaryotic and eukaryotic have cell membranes so this wouldn't really help much in determining).
Explanation:
Choose all of the chemical changes: Group of answer choices
A burning wood
B melting ice
C making snow cones
D dissolving salt
E cooking eggs
F rusting car fender
dissolving salt
Explanation:
i do not know
Which of the following is not a stress response?
Rise in heartbeat rate
Higher blood pressure
Slower eye movement
Racing thoughts
Answer:
Which of the following is not a stress response?
Rise in heartbeat rate
Higher blood pressure
Slower eye movement (it's actually the opppsite)
Racing thoughts
The energy animals need for their life functions is released when their cells carry out which of the following functions? A) Breaking down glucose
B)Absorbing water from the environment
C)Moving molecules across membrane
D)Eliminating waste products
Answer:
The answer is option A = Breaking down glucose.
The amoeba is protozoan that moves with
Flagella
Cillia
Pseudopodia
None of the abobe