a hypothesis that has support to back it up and is yet to be disproved
Answer:
a theory
Explanation:
A hypothesis that has support to back it up and that is yet to be disproved can be referred to as a theory.
Ordinarily, a hypothesis is a tentative statement that has not been proven in any way. Once a hypothesis has supports to back it up and there are no counter-evidence to disprove it, it becomes a theory.
In other words, a theory is a proven hypothesis and it remains so until there are overwhelming evidence to counter the supporting evidence.
What is the pH of a 0.15 M NH4OH solution with a Kb of 1.78 x 10^-5?
a. 11.21
b. 11.93
c. 12.09
d. 10.85
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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explain why if the pancreatic duct is cut, then digestion is affected but the control of blood glucose is not
Answer:The pancreas is a mixed exocrine and endocrine organ that is located in the retroperitoneum in the upper abdomen. It is a firm, fleshy organ that has a yellow lobulated cut surface. The weight of the pancreas is in the range 50-150g and the length is around 150mm.The pancreas is a mixed exocrine and endocrine organ that is located in the retroperitoneum in the upper abdomen. It is a firm, fleshy organ that has a yellow lobulated cut surface. The weight of the pancreas is in the range 50-150g and the length is around 150mm.
Explanation:
5. Tap water will evaporate faster than salt water.
Independent Variable:
Dependent Variable:
Hypothesis:
Answer:
Ind. V= type of water, dep. v= rate of evaporation, hypothesis= Tap water will evaporate faster than salt water.
Explanation:
Independent Variable Tap water, salt water.
Dependent Variable rate of evaporation.
Hypothesis Tap water will evaporate faster than salt water.
What is a variable?A variable is anything we measure: an event, a time interval, etc. It does not have a fixed value.
What is an independent variable?It is a variable whose value is not affected by the other variables being studied. Alternatively, it is the cause.
What is a dependent variable?It is a variable whose value is determined by the changes in the independent variable. It is the effect.
What is a hypothesis?A hypothesis is a statement that is presented as an argument and then is tested to see if it is correct.
To learn more about variable, independent variable, dependent variable, and hypothesis here,
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what are the 7 characteristics all living things have or do? do viruses fit this definition?
answer
nutritionrespirationexcretionreproductiongrowthmovementsensitivityyes virus fit that definition.
that's the answer that I know
thank you
Why do researchers need a lot of data to monitor a species population?
Answer:
Researchers need a lot of data to monitor a species population because the environment is very diverse in types of species found at different places .
What happens to one part of it could affect the population of other animals, humans, and may also effect the ecosystem of that certain environmental region .
In a grassland ecosystem, if the population of eagles suddenly decreased, what will most likely be the effect on the rest of the ecosystem
The three types of "scientific" research you might come across are ___ , ___ , and ___ .
Answer:
Physical, Earth, and Life science are 3 common scientific researches
Explanation:
Hope this helped!
~Emilie Greene
One out of 10,000 babies born in North America is affected by cystic fibrosis, a recessive condition. Assuming that the North American human population is in Hardy-Weinberg equilibrium for this trait, what percentage of the population is heterozygous for this trait
Answer:
2pq= 1.9% (almost 2%)
Explanation:
You will find the complete answer in the attached file due to technical problems.
what are the similarities between living and non living things
both having gravity, you can touch and see both of it. It also possible if microorganisms can live on both of them.
They both have shape also.
Answer:
1. They both occupy space.
2. They both are made of atoms and molecules.
3. They both can be moved at the cost of energy.
4. They both have mass.
5. They both consist of fundamental units.
Hope it helps!!Please mark me as the brainliest!!!Thanks!!!!❤✨
NB: Similarities between are mostly: [Both have, contain] Meaning we should use (Both) in writing similarities.
What are the smallest functional and structural building blocks of life
Answer:
Explanation:it is a cell because that is what starts life
40 POINTS! FIRST TO ANSWER CORRECTLY GETS BRANLIEST! The image below shows a certain type of global wind: What best describes these winds? Polar easterlies caused due to sinking, cool air above the poles Polar easterlies caused due to rising, warm air above the poles Trade winds caused due to sinking, cool air above the equator Trade winds caused due to rising warm air above the equator
Answer:
Its b
Explanation:
Answer:
Polar easterlies caused due to rising, warm air above the poles
Explanation:
Got it right!
Which of these elements is found in both carbohydrates and water?
Answer:
tyyyyyyyyyyyyyy
Explanation:
yyyyyyyyyyyyyy
Answer: B
Explanation:
What does selective mean?
Answer:
relating to or involving the selection of the most suitable or best qualified.
An experiment was conducted to determine if hot water will freeze faster than water at room temperature. Which of the following is the dependent variable? 1.Temperature of the freezer 2.The water at room temperature 3.The hot water 3.The rate of freezing
Answer:
The dependent variable is the variable that changes when the independnet variable is manipulated.
Explanation:
The independent variable is the water temperatures, the variable you change. The dependent variable is the rate of the water freezing.
Amoebas and euglenas can protect themselves from unfavorable conditions with a
cyst
spore
vacuole
asci
Answer:
Option A.
Explanation:
During the unfavourable conditions, Amoeba FORMS A CYST which help Amoeba to protect it from adverse conditions or environment.
Answer:
CYST
Explanation:
Again sorry.,. Can yo uh guys check my answer again because I know that we obviously need soil to give the nutrients to the plants so that they can grow but the main thing they need to grow is, soil,water and sun.
As biochemistry has matured as a science, new branches of the field have developed to maintain the ever-growing database of information. Assign the purpose on the right with the field on the left. A) bioinformatics 1) assess the expression and function of genes B) proteomics 2) determine the intracellular concentrations of small molecules C) metabolomics 3) mathematic analysis of DNA sequence data D) genomics 4) identify the function of proteins
Answer:
A:3, B:4, C:2, D:1:
The nitrogen cycle could not exist without
.
What is a biome and why is it important to protect all kinds of biomes?
Answer:
a biome is a community with distinct climates for organisms both plant and animals.
Explanation:
When a biome is destroyed, food sources for many organisms are lost, as well as their habitat. many species will become endangered or extinct. as ome species become extinct it causes a chain reactiom affect many other species to become endangered and the nature will fail to balance. losing a biome causes loss of many plantatioms which many lead to more CO2 in the atmosphere and hence global warming. global warming casue draught, famine and again, loss of many species and even spread of diseases.
True or False: In an experiment to avoid errors you should only change one variable, all other factors should remain the same.
Answer:
True
Explanation:
In an experiment, if you change more than one variable at a time, you will not know what is causing the potentially different outcome. If you only change one variable and leave all other factors constant, you will know exactly what is causing the data.
I hope this helps!
-TheBusinessMan
Pathogens are microorganisms that can make you sick if you eat them. True or false
The answer is: True
Which of the following is an example of a testable question? Are people who read non-fiction smarter than people that read fiction? Does God exist? Does Nyquil cause a decrease in heart rate in mice? Do ninth graders’ GPAs increase with better study habits?
Answer:
I think the answer is "Does Nyquil cause a decrease in heart rate in mice". Thank you for the question.
During the water cycle , the suns energy evaporates water from the surface of earth . This water is the source of
Answer:
The answer is Precipitation
Explanation:
Answer:
it is a source of Precipitation
Index fossils are the remains of species that existed on Earth for relatively short periods of time. True or false?
Answer:
yh that true cause they are useful
Answer:
True
Explanation:
Remains of species that existed on Earth for a relatively short period of time, were abundant and widespread geographically, and can be used by geologists to assign the ages of rock layers.
How are natural resources classified?
renewable resource
Explanation:
they are the resource made by god
Compare your observations of micrographs obtained from the optical microscope,the scanning electron microscope, and the transmission electron microscope
Answer:
optical microscope uses visible light and a lense to generate magnification
scanning electron microscope prodces image of a sample scanning with a focused beam of electron
transmission electron microscope in which beam of light of electrins is transmitted through a specimen to form an image
Which Texas ecoregion is considered the wettest out of all the ecoregions? HELP
Which of the following can be attributed to water's high specific heat? O Oil and water do not mix well. O Alake heats up more slowly than the air around it. Ice floats on water. Sugar dissolves in hot tea faster than in iced tea.
Answer:
O A lake heats up more slowly than the air around it.
Hope this helps :)
The high specific heat of water makes lakes to heat up more slowly than the air around it.
Water is said to have high specific heat, what this means is that it requires more energy to raise the temperature of water in relation to other substances.
Before water can become hot or warm, it first has to be able to absorb a lot of heat around. This is very important to climate and it also helps to determine if certain areas of the world are habitable.
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What are the structures found inside a cell that allow a cell to perform a variety of
functions?
EASY
In addition to the nucleus, eukaryotic cells may contain several other types of organelles, which may include mitochondria, chloroplasts, the endoplasmic reticulum, the Golgi apparatus, and lysosomes. Each of these organelles performs a specific function critical to the cell's survival.