As water is heated, its [H+] increases. Thismeans thata. the water is no longer neutralb. [H+] > [OH-]c. [OH-] > [H+]d. a and b are correcte. none of these
Answers
Heating water increases its [H+] concentration, making a) it no longer neutral and b)causing [H+] to be greater than [OH-].
Water molecules can dissociate into hydrogen ions (H+) and hydroxide ions (OH-) in a process called self-ionization. At room temperature, the concentrations of H+ and OH- ions in pure water are equal, resulting in a neutral pH of 7.
However, as water is heated, the equilibrium between H+ and OH- shifts, leading to an increase in [H+] and a decrease in [OH-]. This means that the water becomes acidic, with a pH less than 7, and [H+] becomes greater than [OH-]. Therefore, options (a) and (b) are correct, while options (c), (d), and (e) are incorrect.
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4) The principle of ________ states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past.
A) catastrophism
B) plate tectonics
C) plutonism
D) Uniformitarianism
Answers
The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the
Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.
James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.
This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.
Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.
Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.
In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.
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given the lewis structure of tef6 below, what are the bond angles in the molecule?
Answers
All the bond angles in the molecule are 90° since the molecule is octahedral.
Structure of molecules:The structure of a molecule is predicted on the basis of the valence shell electron pair repulsion theory. This theory establishes the fact that the number of electron pairs in a molecule determines the shape of the molecule.
Bond angles in TeF6The structure of TeF6 is shown in the image attached. We can see from the image that the molecule is octahedral. Therefore, all the bond angles in the molecule are 90°.
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A weak base. B. has a K. of 4.46 x 10-10 A solution with an unknown initial concentration is tested, and found to have a pH of 8.39. Determine the initial concentration of B.
Answers
Answer:
0.013MB
Explanation:
An experiment was conducted to estimate the effect of smoking on the blood pressure of a group of 37 cigarette smokers. The difference for each participant was obtained by taking the difference in the blood pressure readings at the beginning of the experiment and again five years later. The sample mean increase, measured in millimetres of mercury, was x = 9.1. The sample standard deviation was s = 5.5. Estimate the mean increase in blood pressure that one would expect for cigarette smokers over the time span indicated by the experiment. Find the 95% margin of error. (Round your answer to two decimal places
Answers
The 95% margin of error for the mean increase in blood pressure that one would expect for cigarette smokers over the time span indicated by the experiment is ±1.98 (rounded off to two decimal places).
The mean increase in blood pressure that one would expect for cigarette smokers over the time span indicated by the experiment can be estimated by using the formula;μ = x ± z(\(a^{2}\)) * σ/√n
Where;μ is the population mean increase.x is the sample mean increase.z(\(a^{2}\)) is the z-scoreα is the level of significanceσ is the population standard deviationn is the sample size.
Substituting the given values into the formula;μ = 9.1 ± 1.96 * 5.5/√37= 9.1 ± 1.98
The mean increase in blood pressure that one would expect for cigarette smokers over the time span indicated by the experiment lies between 7.12 to 11.08.
Hence, the estimated mean increase is between 7.12 to 11.08 millimeters of mercury.
The 95% margin of error can be calculated using the formula;
Margin of error (E) = z(\(a^{2}\)) * σ/√n
Margin of error (E) = 1.96 * 5.5/√37
Margin of error (E) = 1.98 (approximated to two decimal places).
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Explain Albedo…………….
Answers
Explanation:
Albedo is the fraction of light that a surface reflects. If it is all reflected, the albedo is equal to 1. If 30% is reflected, the albedo is 0.3. The albedo of Earth's surface (atmosphere, ocean, land surfaces) determines how much incoming solar energy, or light, is immediately reflected back to space. This can have an impact on climate.
which properties change the composition of a substance?
Answers
Answer:
the substance of the composition change the
properties.
If a chemical reaction occurs, the properties of substances before and after the substances interact must be
Answers
Answer:
different
Explanation:
A chemical reaction may be defined as the process or method by which a substance undergo a change in their structure chemically when reacting with some other substance and acquiring the property of both or sometimes forms a new substance. It leads to the chemical transformation of the chemical substance to some another substance.
The properties of the new substance formed is different form the parent substance before the reaction.
Thus, when chemical reaction occurs, the properties of the substances before the reaction and after the reaction takes place is different.
.239cal=J joules. How many joules J are in 450cal?
Answers
Answer:
1.89
Explanation:
238cal = J joules
450cal = xJ joules
\( \frac{450}{238} = \frac{xj}{j} \)
1.89 = x
450cal = 1.89J joules
What splitting pattern is observed in the 1H NMR spectrum for the indicated (BOLD) hydrogen (on carbon
Answers
Number many peaks are present in the ¹H-nmr spectrum of Eugenol are having 12 different hydrogen atom.
How many peaks are present in the 1h-nmr spectrum of Eugenol?The Eugenol has contain the 12 different hydrogen atoms. in the ¹H-nmr spectrum the peaks from right to left is 3:2:2:3:2. The three hydrogen atoms have two peaks of about the 6.7 pm.The integral of 2H means that this group is a methylene, so it has two hydrogens. The carbon bearing these two hydrogens can have two other bonds. Another type of additional data available from 1H NMR spectroscopy is called multiplicity or coupling. Coupling is useful because it reveals how many hydrogens are on the next carbon in the structure. That information helps to put an entire structure together piece by piece.In ethanol, CH3CH2OH, the methyl group is attached to a methylene group. The 1H spectrum of ethanol shows this relationship through the shape of the peaks. .This pattern is called a multiple, and specifically a quartet. A quartet means that these hydrogens have three neighbouring hydrogens on adjacent carbons.
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Where would one find the s-block, p-block, d-block and f-block elements on the periodic table?
Answers
Answer:
You can find p-block elements on the periodic table in groups 13 to 18, you can find the s-block on the periodic table in group 1, Group 3 through Group 12 are d-block elements, and The f-block elements, found in the two rows at the bottom of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.
Explanation:
Hope this helps!
3. this lab was performed using cross or mixed aldol reagents, an aldehyde and a ketone. how was the formation of a mixture of possible products minimized?
Answers
To minimize the formation of a mixture of possible products when using cross or mixed aldol reagents, careful selection of the aldehyde and ketone is important. Ideally, the aldehyde and ketone should have similar reactivity and should not have multiple reactive sites.
Additionally, controlling the reaction conditions such as temperature, solvent, and catalyst can also help to minimize the formation of unwanted products. Finally, purification techniques such as column chromatography or recrystallization can be used to isolate the desired product and separate it from any remaining impurities.
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design a 5‑step synthesis of the alcohol shown using the reagents provided.
Answers
The 5-step synthesis of the alcohol shown using the reagents provided is: Alkyne → Aldehyde → Protected Aldehyde → Alkene → Primary Alcohol → Alcohol.
To design a 5-step synthesis of the alcohol shown using the reagents provided, we can follow the following steps:
Step 1: Convert the alkyne to an aldehyde using Ozone (O3) followed by Dimethyl Sulfide (CH3)2S. This will yield an aldehyde with a hydroxyl group (-OH) attached to the second carbon.
Step 2: Protect the aldehyde group using Triethyl Orthoformate (C8H20O3) to yield a protected aldehyde.
Step 3: Reduce the triple bond using Sodium Borohydride (NaBH4) to yield an alkene.
Step 4: De-protect the aldehyde using Hydrochloric Acid (HCl) to yield a primary alcohol.
Step 5: Oxidize the primary alcohol using Jones Reagent (CrO3/H2SO4) to yield the desired alcohol.
Therefore, the 5-step synthesis of the alcohol shown using the reagents provided is:
Alkyne → Aldehyde → Protected Aldehyde → Alkene → Primary Alcohol → Alcohol.
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Which statements accurately describe volume? Check all that apply. Volume is a physical property of an object. Volume is measured using a balance. The volume of a solid changes with the shape of the container. One unit of volume is the milliliter. Liquids and solids have constant volumes
Answers
Answer:
Liquids and solids have constant volumes
Explanation:
I believe this is the most correct statement
Answer:
Volume is a physical property of an object.
One unit of volume is the milliliter.
Liquids and solids have constant volumes.
Hope this helps <3
Explanation:
Summary
1.
Water is the most abundant substance on the surface of the earth.
About 71% of the earth's surface is covered by water.
2. Hydrogen is prepared in the laboratory by the action of zinc on
dilute hydrochloric acid or dilute sulphuric (VI) acid.
3. Hydrogen burns in oxygen to produce water. Water is an oxide
of hydrogen.
4. Active metals react with cold water to produce hydrogen gas
and the hydroxide of the metal in solution. Less active metals
react with steam to produce hydrogen and the oxide of the metal.
Copper and lead do not react with water.
5. Hydrogen is a reducing agent. It removes combined oxygen
from metal oxides of the less reactive metals.
6.
Reduction is the loss of oxygen from a compound. Oxidation is
the gain of oxygen by a substance.
7.
A reducing agent is a substance which removes oxygen from
another substance. An oxidising agent is a substance which gives
out oxygen to another substance.
when
water changes the
colour of coppe - 11
Revision Exercise sulphatorom blueto
1. (a) State the chemical tests for presence of water.
water change the color
(b) State the test, which is used to show that water is pure. Chistide paper from b
of copper anhydrous cobele
2.
Describe an experiment to show that water is an oxide of hydrogen.t non
3. State the precautions that must be taken when carrying out experiments with hydrogen.
Why is it not advisable to use iron in making steam boilers?
Write a word equation for a reaction in which hydrogen acts as a reducing agent.
Name the products formed when kerosene is burned in air.
State what is observed when a small piece of potassium is placed in water. Write a
word equation for the reaction.
Draw a labelled diagram to show how a reaction between steam and magnesium should
be carried out.
Describe how dry hydrogen is prepared in the laboratory.
Property of the Government of Kenya
Potassium
sodium
Calcim
Magne
Alun
Corbi
Zin
Answers
Explanation:
I know only one.You are in form.....
if x x represents the molar solubility of b a 3 ( p o 4 ) 2 bax3(pox4)x2 , what is the correct equation for the k s p ksp ?
Answers
If x represent the molar solubility of Ba₃(PO₄)₂ Bax₃(POx₄)x₂ the correct equation for Ksp is (3x)³(2x)².
The equation is given as :
Ba₃(PO₄)₂ ⇄ 3Ba²⁺ + 2PO₄³⁻
if x represent molar solubility then , we get :
Ba₃(PO₄)₂ ⇄ 3Ba²⁺ + 2PO₄³⁻
3x 2x
therefore , the solubility product constant is given as :
Ksp = (3x)³(2x)²
The solubility product constant is the equilibrium constant which used for the dissolving of solid substances into the aqueous solution. The solubility product constant is denoted as Ksp. The value of solubility constant depends on temperature.
Thus, If x represent the molar solubility of Ba₃(PO₄)₂ Bax₃(POx₄)x₂ the correct equation for Ksp is (3x)³(2x)².
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Which of the molecules are used as second messengers in signal transduction pathways?.
Answers
Cyclic AMP, cyclic GMP, inositol triphosphate, diacylglycerol, and calcium molecules are used as second messengers in signaling transduction pathways.
When a cell is exposed to extracellular signaling molecules, or first messengers, second messengers, or intracellular signaling molecules, are released by the cell. (Intercellular signals, a non-local form of cell signaling that includes both first and second messengers, are divided into four categories based on their range: autocrine, juxtacrine, paracrine, and endocrine.)
Second messengers cause physiological alterations at the cellular level, including depolarization, migration, apoptosis, differentiation, and proliferation. One of the catalysts for intracellular signal transduction cascades, they are: Cyclic AMP, cyclic GMP, inositol triphosphate, diacylglycerol, and calcium are examples of second messenger chemicals.
Extracellular components, frequently hormones or neurotransmitters like adrenaline, growth hormone, and serotonin, are the first messengers.
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What does the 16 mean in the isotopes carbon 16
Answers
Answer:
Carbon 16
Explanation:
Isotope of nitrogen
3. Answer the following two questions (20 points each part is 10 points) a. The orthoclose (potassium feldspar) clay mineral reacts with the HF/HCL mixture according to the following stochiometric reaction equation. For the 3 wt % HF (specific gravity of about 1.152 and MW=20) reacting with orthoclase feldspar (MW = 278.4 and p = 2.65 gr/cc) you are asked to calculate the gravimetric and volumetric dissolving powers Orthoclase (potassium feldspar): KAISI 308 + 14HF + 2H+K+ + AIF + 3SiF4 + 8H₂O b. A sandstone with a porosity of 0.22 containing 12% (volume) calcite (CaCO3) is to be acidized. If the HCI preflush is to remove all carbonates 36 inches beyond a 0.328-ft radius wellbore before the HF/HC1 stage enters the formationbefore the HF/HC1 stage enters the formation, what minimum preflush volume (gallons of acid solution per foot of formation thickness) is required if the preflush is 15% HCl solution?
Answers
The minimum preflush volume (gallons of acid solution per foot of formation thickness) required is:Volume of preflush solution (gallons/ft) = 0.17045 x 33.45= 5.7 gallons/ft.
a. Dissolving power of HF/HCL mixture:For the given equation, the molecular weight of potassium feldspar is 278.4 and the specific gravity of HF (3% solution) is 1.152. Therefore, we can calculate the gravimetric dissolving power of HF/HCl mixture as follows:Weight of HF = 3/100 x 1 x 1000 = 30 g/LiterThe equation requires 14 moles of HF to dissolve 1 mole of orthoclase feldspar. Therefore, the number of moles of HF required to dissolve 3% of orthoclase feldspar is:(14/1) x (3/100) = 0.42 mole/Liter
The volume of HF required to dissolve 3% of orthoclase feldspar is therefore:Volume of HF = (0.42 x 20)/30 = 0.28 L/LiterThe gravimetric dissolving power of HF/HCl mixture is calculated as follows:Dissolving power = (MW of orthoclase feldspar)/(Volume of HF required to dissolve 3% orthoclase feldspar)Dissolving power = 278.4/0.28 = 994.28 g/Liter
The volumetric dissolving power of HF/HCl mixture is calculated as follows:Dissolving power = (MW of orthoclase feldspar)/(Number of moles of HF required to dissolve 3% orthoclase feldspar)Dissolving power = 278.4/(0.42 x 20) = 330.86 g/Literb. Minimum preflush volume (gallons of acid solution per foot of formation thickness) required:Given data:Porosity = 0.22Volume of calcite = 12%Volume of sandstone = 88%Volumetric ratio of acid to sandstone (S):A = 1 - 0.12 = 0.88B = 0.12S = 0.15/0.88 = 0.17045The radius of the wellbore (r) is 0.328 ft.The volume of the annular region that needs to be flushed = πr²h= 3.14 x 0.328² x 36= 12.61 cubic feetVolume of the sandstone = Volume of the annular region that needs to be flushed/porosity= 12.61/0.22= 57.32 cubic feetThe thickness of the sandstone layer (h) = Volume of sandstone/area of annular region that needs to be flushed= 57.32/(π(0.328)² - π(0.328-0.0625)²)= 33.45 ft
Therefore, the minimum preflush volume (gallons of acid solution per foot of formation thickness) required is:Volume of preflush solution (gallons/ft) = 0.17045 x 33.45= 5.7 gallons/ft.
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Alexandra decides to climb mt. krumpett, which is 5000 m m high. she determines that this will require a total of 3150 kcal k c a l of energy for the trip. for her food supply, she decides to take nutrition bars. the label states that each bar contains 50 g g of carbohydrates, 10 g g of fat, and 40 g g of protein. how many nutrition bars should alexandra pack?
Answers
Alexandra should pack 7 nutrition bars for climbing the Mt. Krumpett that will require 3150 kcal of energy for the trip.
According to the question, one pack of nutrition bar contains
carbohydrates = 50 gfats = 10 gproteins = 40 gTo calculate the energy of food (in Kcal), the formula used will be:
Energy = 4 × [carbohydrates (gm) + proteins (gm)] + 9 × [fats]
Energy (E) = 4 × [50 + 40] + 9 × [10]
E = 360 + 90
E = 450 Kcal.
One pack of nutrition bar contains 450 Kcal of energy, therefore to calculate the number of packs required, the total energy required to climb should be divided by the energy of one bar.
Number of nutrition bars = 3150 Kcal / 450 Kcal
Number of nutrition bars = 7.
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What is significant about the temperature absolute zero?
Answers
Explanation:
The absolute temperature is the lowest possible temperature in the universe. At this temperature, all atoms become motionless and cease to move.
The value of the absolute zero is pegged at -273.16°C.
It is the lowest limit of the coldness of a body. Nothing can be colder than a body at absolute temperature. Many researches are underway to take advantage of this temperature value for scientific purpose. Thermodynamically, all process stops at this temperature. When a body is brought close a body at absolute zero, it can suffer cryogenic burn due to heat transfer.Which equation is balanced?
Al+3O2→Al2O3
2Al+3F2→2AlF3
Na+F2→2NaF
Mg+2O2→2MgO
Answers
Answer:
3rd one
Explanation:
I just took the test and got 100%
Answer:
2nd one
Explanation:
Took the test
What are two ways that plants use energy from food.
Answers
Answer:
the sun to change water and carbon dioxide into a sugar called glucose.
Explanation:
lithium metal reacts with nitrogen gas to produce lithium nitride. what volume of nitrogen gas at 2 atm and 175◦c is required to produce 75.0 g of lithium nitride?
Answers
The volume of nitrogen gas required to produce 75.0 g of lithium nitride at a pressure of 2 atm and a temperature of 175 °C is 19.7 L.
Lithium metal reacts with nitrogen gas to produce lithium nitride. Weight of lithium nitride produced = 75.0 g, Pressure of nitrogen gas, P = 2 ATM, Temperature of nitrogen gas T = 175 °C.
We need to find the volume of nitrogen gas required to produce lithium nitride. To solve the problem, we will use the following steps:
Conversion of pressure and temperature to SI units
The given pressure is 2 atm.1 atm = 101325 Pa2 atm = 2 × 101325 Pa = 202650 Pa
The given temperature is 175 °C = 448 K2.
Calculation of number of moles of lithium nitride produced
Molar mass of lithium nitride, Li₃N = (3 × 6.94) + 14.01 = 34.83 g/mol
Number of moles of Li₃N produced = mass / molar mass= 75.0 / 34.83= 2.1529 moles3.
Calculation of number of moles of nitrogen gas required, We know from the balanced chemical equation:
6 Li + N₂ → 2 Li₃N
This equation shows that 6 moles of Li react with 1 mole of N₂ to produce 2 moles of Li₃N.
So, the number of moles of N₂ required to produce 2.1529 moles of Li₃N= 1 × (2.1529 / 2) = 1.0765 moles4.
Calculation of volume of nitrogen gas required
Using the ideal gas equation, PV = nRT
where P is the pressure in Pa, V is the volume in meter cubed, n is the number of moles, R is the gas constant = 8.31 J/mol K, and T is the temperature in Kelvin.
Substituting the given values, we get:
V = nRT / P= (1.0765 × 8.31 × 448) / 202650= 0.0197 m³= 19.7 L.
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X, Y & Z represents 2, 12 & 17 relatively a. Write the electronic configuration of x, y, and z b. Place the elements in the appropriate group and period of the periodic table. c. X, Y & Z represents 2, 12 & 17 relatively
Answers
The electronic configuration of x, y, and z.
\(x=1s^2\)
\(Y= 1s^22s^22p^63s^2\)
\(Z= 1s^22s^22p^63s^23p^5\)
What is an electronic configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
a.
\(x=1s^2\)
\(Y= 1s^22s^22p^63s^2\)
\(Z= 1s^22s^22p^63s^23p^5\)
b.
x= Period 1 and group18
Y=Element is in period 3 and Group 2
Z=Element is in period 3 and group 17.
c.
X, Y & Z represents Helium, magnesium, and chlorine.
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I need help with this! I don't fully understand it
Answers
Answer:
1. highest is 25.7c° and lowest is 20.0c°
2.Is Exothermic. An Endothermic Reaction is a chemical reaction that absorbs energy in the form of light or heat. In it, the energy or enthalpy of the reactants is less than that of the products. An Exothermic Reaction is a chemical reaction that gives off energy in the form of light or heat.
3. Reactans.
4. The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
What is the best set of reagents to achieve the following transformation? ph-co2h => ph-come
Answers
The best set of reagents to achieve the ph-co2h => ph-come will be Br2, CH2N2.
A material or ingredient supplied to a system to trigger a chemical reaction or check to see whether one occurs is known as a reagent as well as an analytical reagent. Reactant refers to a substance that is consumed during a chemical reaction. The phrases reactant and reagent just aren't frequently used interchangeably.
Diazomethane reacts swiftly and extremely effectively, producing just N2 as a byproduct, making it an appealing methylating agent for carboxylic acids including phenols.
Therefore, the best set of reagents to achieve the ph-co2h => ph-come will be Br2, CH2N2.
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how can we separate the mixture of water and sugar.how?explain
Answers
hess's law can be used to solve for reaction enthalpy changes because enthalpy is a function. a) path b) state c) thermodynamic d) pressure-volume
Answers
b. state , hess's law can be used to solve for reaction enthalpy changes because enthalpy is a state function.
Hess's Law states that the change in enthalpy (heat content) of a chemical reaction is independent of the route by which the reaction occurs. This means that the total enthalpy change for a reaction can be calculated by summing the enthalpy changes for a series of intermediate steps that lead to the final reaction. This allows for the prediction of the heat of reaction for a reaction without the need for direct measurement.
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what is the most common acid added to food? a. citric acid b. malic acid c. tartaric acid d. proprionic acid
Answers
The most common acid added to food is citric acid. It is found naturally in citrus fruits such as lemons, limes, and oranges, and is used in many processed foods and beverages to enhance their flavor and provide a sour taste.
Citric acid is also commonly used as a preservative and to balance the pH of certain foods. While malic acid, tartaric acid, and propionic acid are also used in food production, citric acid is the most widely used due to its availability, versatility, and safety.
The most common acid added to food is citric acid (a). Citric acid is a weak organic acid that is naturally present in citrus fruits, such as oranges and lemons. It is often used as a flavor enhancer, and preservative, and to add a tangy taste to various food products. Some common applications of citric acid include soft drinks, fruit juices, candies, and various processed foods. Its popularity as an additive is due to its effectiveness, affordability, and its ability to blend well with other flavors.
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Gravitational influence of the sun on the different planets. Which is it the least on? Which is it the greatest on?
help please
Answers
Gravitational influence of the sun on the different planets least is mercury 0.38 g and greatest is neptune 1.14 g
Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter and it is by far the weakest known force in nature and thus plays no role in determining the internal properties of everyday matter and the sun is the body that has the greatest gravitational influence on all the other components of the system that revolve around it and least is mercury 0.38 g and greatest is neptune 1.14 g
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