A) The formula for the molarity of HCl is 1.727*10-2 mol/0.025 L= 0.6908 (M). (B) The amount of HCl that one antacid pill neutralises is (0.01727 -0.0046893) mol = 0.0125807 mol.(C) The gel's volume efficacy is 0.004194/0.01*1000, or 419.4 mL.
An aqueous solution of hydrogen chloride is what is known as hydrochloric acid (HCL), commonly referred to as muriatic acid. It has an unmistakably strong odour and is colourless. It is categorised as a powerful acid. In the digestive tracts of the majority of animal species, including humans, it is a part of the stomach acid. The creation of inorganic and organic chemicals, the removal of metal stains, the extraction of oil, the purification of table salt, and pH control all include the usage of HCl. Acid hydrochloride is an inorganic substance. With the chemical formula HCl, it is a very corrosive acid. Muriatic acid and hydrogen chloride are other names for it.
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Compare the atomic and ionic radius of chlorine
Answer:
Explanation:
vdW radius (nm) ionic radius of X- (nm)
Cl 0.175 0.181
Br 0.185 0.196
I 0.198 0.220
A substance with a pH of 11, how many more times more acidic than a substance with a pH of 1
A substance with a pH of 11 is 10 times more alkaline than a substance with a pH of 1.
What is pH and what is it for?The pH is a data that is used as a reference to classify chemical substances according to their alkalinity or acidity. The pH is measured on a scale from 0 to 14 that is divided as follows:
A pH value of 7 is neutral, which means that the substance or solution is neither acidic nor alkaline.A pH value of less than 7 means that it is more acidic.A pH value of more than 7 means that it is more alkaline.According to the above, it can be inferred that the substance that has a pH of 11 is not more acidic but alkaline. On the other hand, the substance with a pH of 1 is more acidic.
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What is the approximate ph of a 0. 10 m solution of a weak acid that has a ka of 5 x 10-5 m?.
A chemical that releases hydrogen ions into water when coupled with certain metals to form salts.
What is meant by acid?A substance that, when combined with specific metals, creates salts by releasing hydrogen ions into water. Acids taste sour and cause some colours to turn red. Gastric acid is one of the body's natural acids, and it can support organ function. A substance is considered an acid if it tastes sour in aqueous solution, turns blue litmus paper red, reacts with some metals to release hydrogen, reacts with bases to produce salts, and fosters chemical reactions (acid catalysis).
A chemical that tastes sour and when added to water, produces hydrogen ions is referred to as an acid in science. Acids with a pH lower than 7 will cause litmus to turn red. Any material that when combined with hydrogen ions becomes an acid
weak acid:
HA ↔ H+ + A-
∴ Ka = 5 E-5 M = [H+][A-]/[HA]
∴ [HA] = 0.10 M - [A-]
∴ [H+] = [A-]
⇒ Ka = [H+]²/(0.10 - [H+])
substitute the values in the above equation we get
⇒ [H+]² + 5 E-5[H+] - 5 E-6 = 0
simplifying the above equation, we get
⇒ [H+] = 2.211 E-3 M
⇒ pH = - Log [H+]
⇒ pH = 2.6553
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What type of reaction is 2SO₂ + O₂ ⇾ 2SO₃?
Answer:
the reaction is synthesis When two or more simple compounds combine to form a more complicated one. This is also known as a direct combination reaction.
Explanation:
Consider the physical and
chemical properties
shown on the SDS. At
what temperature will
Napthalene, a chemical
found in moth balls, melt?
A. 100 °C
B. 1.0253 °C
C. 217.9°C
D. 80.2 °C
Answer:
C
Explanation:
Don't think too much. Go with short to the point way... Melting point is always go with lowest point 80.2 degree C
Can someone help me with these. They’re about earths water. Ik this isn’t chemistry but I couldn’t find anything with just science.
75% of the surface of the world is covered by water, yet only a small portion of that water, 97% of it being in the oceans, is suitable for use by people, animals, or plants since it is too salty.
What is fresh water?Freshwater is defined as water with less than 1,000 milligrams of dissolved particles per liter, most frequently salt. Earth's surface water bodies are often seen as renewable resources because they are a part of the water cycle, despite the fact that they rely heavily on other water cycle components.
What is water that is fresh?Freshwater is defined as water with less than 1,000 milligrams of dissolved particles per liter, most frequently salt. Earth's surface water bodies are involved in the water cycle.
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What is the limiting reactant in the balloon with 2.5g of baking soda and vinegar?
The limiting reactant in this reaction is the baking soda (sodium bicarbonate).
What is limiting reactant?A limiting reactant is a reactant in a chemical reaction that is completely consumed before the other reactants. It limits the amount of product that can be formed; the amount of product created is directly proportional to the amount of the limiting reactant present. The term is also known as the limiting reagent. This concept is used in stoichiometry, which is the calculation of the amount of product that can be formed from a given amount of reactants.
This is because it takes more moles of baking soda (NaHCO3) than vinegar (CH3COOH) to cause the reaction to occur. Since there are only 2.5g of baking soda present, it will be used up first and the reaction will stop once all the baking soda has been used.
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The structure of 1,1,2,2-tetraiodosilane is as follows:
Strong heating has no effect on this substance. Long-term storage at room temperature is possible, but it must be kept dry because it interacts fast with moisture and water in the air.
On a large scale, it can be produced via the reaction of silicon or silicon carbide with iodine when heated to roughly 200 °C. The interaction of silane with iodine vapor at temperatures between 130 and 150 °C is of more academic interest because a variety of compounds, including iodosilane SiH3I, diiodosilane SiH2I2, and triiodosilane SiHI3, are produced. The liquid forms of these compounds are colorless at normal temperatures. [3] Iodoform, a related carbon compound that is a yellow solid at ambient temperature, can be easily separated from the final one.
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HELP ME PLEASE!!!!
12C6. 13C6. 14C6
Three isotopes of carbon are found in nature: carbon 13, that has 7 neutrons, carbon 14, that has 8 neutrons, and carbon 12, that has 6 particles (plus 6 protons = 12).
Isotope 13C is it?A naturally occurring stable isotope that carbon with such a nucleus made up of six protons & seven neutrons is called carbon-13 (13C).
What makes carbon-14 an isotope?The amount of protons in an element's nucleus determines how it will react chemically.However, the amount or neutrons in the nucleus of different atoms in the same element might vary.
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what is the fakeing answer
Answer:
to give a fake answer ofc
What is the limiting reactant if 4. 0 g of nh3 react with 8. 0 g of oxygen? o2 because it produces only 0. 20 mol of no. Nh3 because it produces only 0. 20 mol of no. O2 because it produces two times less no than nh3. Nh3 because it produces three times more no than o2.
The limiting reactant if 4. 0 g of nh3 react with 8. 0 g of oxygen is Oxygen because it produces only 0. 20 mol of NO. the option A is correct.
The reactant that is present in a chemical reaction at a lower concentration than the other reactant and determines the production of the product is known as the limiting reactant.
Ammonia dissociation's balanced equation is:
4NH₃ +5O₂⇒ 4NO +6H₂O
To react with 5 moles of oxygen, 4 moles of ammonia are needed.
The moles are listed as:
moles = mass/ mass molar
The available moles of ammonia in 4 gram is:
moles NH₃ = 4 /17 = 0.23 moles
moles oxygen = 8 / 16 = 0.25 moles
The moles of oxygen required for 0.23 moles of ammonia are:
5/4 x 0.23 = 0.28 moles
The amount of oxygen that is needed is 0.28 mol, yet there are only 0.25 mol of oxygen that are readily available. So, the limiting reagent is oxygen.
Therefore, choice A is right.
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For an element, how does Avogadro’s number connect the atomic and macroscopic scales?(1 point)
Responses
It describes the number of atoms in 1 gram of an element.
It describes the number of atoms in 1 gram of an element.
It describes the number of moles in 1 gram of an element.
It describes the number of moles in 1 gram of an element.
It describes the number of atoms in 1 mole of an element.
It describes the number of atoms in 1 mole of an element.
It describes the number of grams in 1 mole of an element
Answer:
It describes the number of atoms in 1 mole of an element.
Explanation:
Avogadro's number is simply a definition of a very large number. It is called a mole. It has no physical units. It simply means 6.02x10^23 of something. Anything. Atoms, molecules, paper clips, dollars, school buses, people waiting in line for a concert, etc. Anything. Similar words include billion, trillion, quintillion, picometer (look it up) and similar shorthand for very large numbers. "Santa received 1.8 moles of letters this past year" is an easier way of saying that he received 1,080,000,000,000,000,000,000,000 (or 1.08x10^24) letters. Publishers didn't like the idea that science books may be cluttered with such nonsense. And scientists have more fun things to do than wrtite out such long numbers [correctly], so the mole was invented. It's relationship to the Periodic Table and concept of molar mass is it's true value, but that isn't aksed in this question.
. Calculating The half-life of iron-59 is 44.5 days.
After 133.5 days, 2.76 g of iron-59 remains.
What was the mass of the original sample?
-SOMONE JUST PLEASE HELPP ME IM LITERALLY STUCK!!
Answer: Just in case your still stuck, The half-life of iron-59 is 44.5 days, which means that half of the original sample will decay in that amount of time. After 133.5 days, 2.76 g of iron-59 remains. To find the original mass of the sample, we need to know how many half-lives have passed.
133.5 days / 44.5 days/half-life = 3 half-lives
After three half-lives, the remaining mass is 1/8 of the original mass. Therefore,
2.76 g * 8 = 22.08 g
The original mass of the sample was 22.08 grams.
Hope this helps you now or later on :)
How many grams of water are produced if we react 3 moles of hydrogen with 3 moles of oxygen? 2 h2 (g) + o2 (g) + 2 h2o (g).
There would be 1.67 grams of water are produced if we react 3 moles of hydrogen with 3 moles of oxygen.
First we write the balanced reaction
2H₂ (g) + O₂ (g) → 2H₂O (l)
From the reaction we know that 2 moles of H₂ and 1 mole of O₂ produce 2 moles of 2H₂O. the limiting reactant is hydrogen, so we can use unitary method to calculate the moles of water produced
Moles of water= 2/2 x moles hydrogen
Moles of water = 2/2 x 3 moles = 3 moles
then we can calculate the mass of water produced
Mass water = mass/ mass molar
Mass water = 3 moles / 18 g/mol
mass water = 1.67 gram
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What are the three main types of cells located in the stomach?
Surface mucous cells (foveolar cells), parietal cells, chief cells are the three main types of cells located in stomach.
The stomach lining is covered by these cells' thick mucus, which shields it from the digestive juices. The stomach lining is always protected because the surface mucous cells continuously regenerate.
The gastric pits, which are primarily found in the fundus, the upper region of the stomach, contain parietal cells. They release hydrochloric acid, which aids in the digestion of meals.
The fungus, where the gastric glands are located, contains chief cells. They release digestive enzymes that aid in food digestion. Pepsinogen is secreted by the main cells. In the presence of hydrochloric acid, it turns into pepsin. Pepsin aids in the breakdown of proteins into little molecules called polypeptides.
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what are 3 main eleme
Hydrogen
Magnesium
Iron
Helium
Sulfur
Copper
Aluminum
Argon
Xenon
etc.
When converting from moles to particles or moles to grams, you must...
A multiply
B subtract
C add
D divide
A. Multiply - When converting from moles to particles or moles to grams, you must multiply.
What is moles?Moles are small mammals that are found in many parts of the world. They are burrowing animals that live in underground tunnels and feed on insects, worms, and other small animals. Moles have small eyes and ears, and their fur is usually black or brown. They have large front feet with long claws that help them dig their tunnels. Moles are solitary animals and are active mainly at night. They are important to the environment because they aerate the soil and help control insect populations.
This is because moles are a unit of measurement that represent the number of particles or grams in a given substance. To convert from moles to particles or moles to grams, you must multiply the number of moles by the number of particles or grams in one mole of the substance.
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Calculate the mass of 0.5 more of Sodium chloride [Na = 25, CL = 35.5].
The mass of an additional 0.5% sodium chloride is 2.93×10^23
What is sodium chloride used for?As an electrolyte replenisher, sodium chloride is used to assist reduce heat cramps brought on by excessive sweating. This drug is also used to make a standard isotonic sodium chloride solution. The chemical formula for the ionic compound sodium chloride, often known as salt, is NaCl, which represents a 1:1 ratio of the ions sodium and chloride. 39.34 g Na and 60.66 g Cl have molar weights of 22.99 and 35.45 g/mol in 100 g of NaCl, respectively. To replace salt and water that have been lost from your body as a result of specific conditions, sodium chloride 23.4% injection is employed (eg, hyponatremia or low salt syndrome). Additionally, it is added to IV fluids that contain carbohydrates and total parenteral nutrition (TPN).
Is sodium chloride harmful to the body?In vulnerable individuals, a high-NaCl diet can increase blood pressure and result in premature mortality. In hypertension, a high-NaCl diet can significantly increase mortality even while it does not further raise blood pressure, in part due to numerous tiny brain infarcts, according to recent research. Salt, commonly known as sodium chloride (NaCl), is a crucial substance that our body uses to transport and absorb nutrients. keep blood pressure steady. maintain the proper fluid equilibrium.
Molecular formula of NaCl is 58.5
58.5gof NaCl=6.023×10^23
28.5g of NaCl= 6.023×10^23÷58.5×28.5
= 2.93×10^23
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Protons and neutrons
Answer:
1. Isotopes are atoms of an element that consist of the same number of protons but a different number of neutrons.
2. No. of protons = 13
No. of neutrons = 27 - 13
= 14
3. refer to attached file
4(a). Since the noble gases can be found in group 18 of the periodic table, it suggests that they have a complete octet (a full valence shell of electrons), and this allows them to be stable gases that show the least reactivity.
4(b). Since the number of protons and electrons are equal in an atom, the opposite charges are balanced and thus, there is no net charge on the atom (neutrons present in the atom have no charge). Hence, an atom is electrically neutral.
5. Mass no. of X = 6 + 6
= 12
Mass no. of Y = 6 + 8
= 14
6. mass number = no. of protons in the nucleus of an atom + no. of neutrons in the nucleus of an atom
atomic number = no. of protons in the nucleus of an atom
isobars = atoms of elements which have the same mass number but different atomic numbers
isotopes = atoms of elements which have the same number of protons but a different number of neutrons
Which reaction will most likely take place based on the activity series?
Li > K > Ba > Ca > Na > Mn > Zn > Cr > Fe > Cd > Ni > H > Sb > Cu > Ag > Pd > Hg > Pt
A)Pt + FeCl3 Right arrow
B)Mn + CaO Right arrow.
C)Li + ZnCO3 Right arrow.
D)Cu + 2KNO3 Right arrow.
According to the activity series , the chemical equation which is correct or chemical reaction which will most likely take place is Li + ZnCO₃ as Li is more reactive than zinc and it will displace Zn from ZnCO₃.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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A concentration cell is a cell in which
a. the cell voltage never varies by more than 1.00 × 10−14 V.
b. the voltage is generated because of a difference in concentrations.
c. the concentrations of all cell components are all 1.00 M.
d. the concentrations of all cell components remain constant throughout the life of the cell.
e. none of these
A concentration cell is a cell in which the two half cells have the same electrodes but have the different concentration. so the correct option is e) none of these.
The concentration cell is the electrolytic cell that is made up of the two half - cells that have the same electrodes but different in the concentration. A concentration cell is dilute the concentrated solution and the concentrate more dilute solution. This creates the voltage when the cell reaches an equilibrium state.
Thus , a concentration cell is in which there is the two half cells and having the same electrodes. The concentration is different.
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When two identical copies of DNA molecules are produced which are exactly the same as the original then this process of making copies of DNA is known as?
Replication is the process in which n two identical copies of DNA molecules are produced which are exactly the same as the original
It is the most basic step occuring in living organisms.
The opening of the double helix and separation of the DNA strands, priming of the template strand, and construction of the new DNA segment are the three main phases in replication.
The DNA double helix's two strands uncoil at a specific spot known as the origin during separation. Then, a number of proteins and enzymes combine to prime the strands for duplication. Finally, the building of the new DNA strands is organized by a unique enzyme known as DNA polymerase.
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Determine if a precipitation reaction occurs between aqueous silver nitrate and aqueous calcium chloride. If a precipitation reaction takes place, write a balanced chemical equation, total ionic equation and net ionic equation for the reaction. Identify any spectator ions.
a. Balanced chemical equation:
b. Total ionic equation:
c. Net ionic equation:
d. Spectator ions:
You are not required to adjust the subscript in this case because Silver does have a charge value + and Chlorine does have a charge of -. However, because nitrate has a charge of - and calcium has a charge of 2+.
What are some uses for nitrate?
Natural compounds called nitrates (or nitrites) can be found in soil, air, and water. In order to prevent the development of bacteria and also to improve the color and flavor of food, nitrates are also employed as a food additive.
Why is nitrate poisonous?
The main health consequence of nitrate and nitrite exposure is methemoglobinemia. The clinical appearance may be one of oxygen starvation with cyanosis, cardiac arrhythmias and circulation failure, and developing central nervous system (CNS) consequences, depending on the amount of total MetHb [Skold et al.
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12. An unidentified mineral that is softer than calcite
exhibits a metallic luster and cubic cleavage. This
mineral most likely is
A) galena
C) halite
B) pyroxene
D) pyrite
Answer: Galena
Explanation:
(A). Galena
An unidentified mineral that is softer than calcite, exhibits a metallic luster and cubic cleavage. This mineral most likely is galena.
What is the name of the mineral that is both soft and hard?Talc, Gypsum, Calcite, Fluorite, Apatite, Feldspar, Quartz, Topaz, Corundum, and Diamond are just a few examples. - The "Mohs Scale of Mineral Hardness" lists common minerals in order of relative hardness, with talc being the softest and diamond being the hardest mineral. This scale should be familiar to rock hounds and earth science students alike.
Is there a metallic sheen to galena?When newly broken, galena is a metallic lead grey with a brilliant metallic shine; as it ages, it turns dark grey or black. It is incredibly hefty and fragile (about 7.6 times as heavy as water). Galena often crystallizes in cubic crystals and cleaves into flawless cubic pieces.
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Which of the following is an example of intermolecular forces?
hydrogen bonding
covalent bonding
lonic bonding
metallic bonding
The example of the intermolecular forces is the hydrogen bonding. The hydrogen bonding means the formation of the hydrogen bond.
The formation of the hydrogen bond is the hydrogen bonding. The hydrogen bonding is the intermolecular force due to the dipole - dipole interaction. It arises due the interaction between the hydrogen atom and the more electronegative atom bonded to it. The example of the hydrogen bonding is the water , that is H₂O. The hydrogen atom is bonded to the more electronegative atom that is oxygen.
The hydrogen bonding are of the two types :
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Indicate the oxidation number of phosphorus, iodine, nitrogen, tellurium, and sillicon in the following ions. Remember that the sum of the oxidation numbers for an ion must equal the charge of the ion.
a. PO43- b. PO33- c. HPO42-
d. P3O103- e. IO3- f. IO2-
g. IO- h. NH4+ i. NO2+
j. NO2- k. NO- l. NO3+
m. N2O22- n. TeO42- o. SiO22-
the oxidation number of the following is a. PO43-: Phosphorus: +5, Oxygen: -2, b. PO33-: Phosphorus: +3, Oxygen: -2, c. HPO42-: Hydrogen: +1, Phosphorus: +5, Oxygen: -2, d. P3O103-: Phosphorus: +5, Oxygen: -2, e. IO3-: Iodine: +5, Oxygen: -2, f. IO2-: Iodine: +4, Oxygen: -2.
g. IO-: Iodine: +1,h. NH4+: Nitrogen: +3, Hydrogen: +1, i. NO2+: Nitrogen: +4, Oxygen: -2, j. NO2-: Nitrogen: +3, Oxygen: -2, k. NO-: Nitrogen: +2, Oxygen: -2, l. NO3+: Nitrogen: +5, Oxygen: -2, m. N2O22-: Nitrogen: +5, Oxygen: -2, n. TeO42-: Tellurium: +6, Oxygen: -2, o. SiO22-: Silicon: +4, Oxygen: -2. The oxidation number (also called oxidation state) of an atom in a chemical compound is a number that represents the degree of oxidation (loss of electrons) of that atom. The oxidation number is assigned based on a set of rules, such as: The oxidation number of an atom in its elemental form is always 0. In a compound, the sum of the oxidation numbers of all atoms must be equal to the charge of the compound (if it is an ion) or 0 (if it is a neutral compound).
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How can different types of light can change materials in different ways
Different types of light can change materials differently because some materials absorb light energy and some reflect light.
How does light interact with objects of different materials?When a light wave touches an object, they are either transmitted, reflected, absorbed, refracted, and diffracted, or depending on the material's makeup and the light energy's wavelength.
Usually, materials absorb a few colors of light and reflect others, to different extents, so that they get colored. Some materials will even absorb light of one color and emit light of another color, an effect called fluorescence.
so we can conclude that different materials absorb and reflect an image's light energy.
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I'm a little confused so can someone check my answers-
1. Which of the following is true about alchemists and alchemy?
Alchemy is a science.
Chemistry developed into alchemy.
Alchemists tried to turn metals into gold. (My answer)
Robert Boyle was an alchemist.
2. Which of the following is alchemy?
A medieval pseudoscience that tried to find ways to change ordinary metals into gold. (My answer)
The discovery that atoms have a unique structure of protons, neutrons, and electrons.
A systematic process of gaining knowledge by observing and testing.
The modern science of chemistry.
3. In which case are medicines based on science rather than pseudoscience?
If the medicines save lives or help many people.
If the medicines have been evaluated using unbiased tests. (My answer)
If the people who create the medicines have science or medical degrees.
If the medicines have been used for many years.
4. Which option describes a science question?
One that can be answered through hypotheses.
One that can be answered through inferences.
One that can be answered by observations of nature.
One that can be answered by investigation. (My answer)
5. Which inference can be made from the fact that Fritz Haber received a Nobel Prize in 1918?
The Haber-Bosch process was an important scientific development.
The Haber-Bosch process was used to make explosives in World War I. (My answer)
The Haber-Bosch process made the world more peaceful.
The Haber-Bosch process initially only made small quantities of ammonia.
Any help with this is appreciated
True- Alchemists tried to turn metals into gold. True-If the medicines have been evaluated using unbiased tests.
Which of the following is alchemy?True- A medieval pseudoscience that tried to find ways to change ordinary metals into gold.
Alchemy is a historical philosophical and proto scientific tradition that was practiced in China, India, the Muslim world, and Europe. It is an old branch of natural philosophy also.
In the early few centuries AD, a handful of pseudo epigraphical works produced in Greco-Roman Egypt are the first to mention alchemy in its Western form.
Which inference can be made from the fact that Fritz Haber received a Nobel Prize in 1918
The Haber-Bosch process was used to make explosives in World War I and The Haber-Bosch process was an important scientific development.
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a nucleotide consists of a nitrogenous base, along with
A nucleotide consists of a nitrogenous base, along with a sugar molecule
A nitrogenous base, a phosphate group, and a sugar molecule with five carbons constitute a nucleotide. The different kinds of nitrogenous bases that can make up a nucleotide are adenine, thymine, guanine, and cytosine. These bases are in charge of the genetic code that is stored in DNA and RNA since they are the base pairs that make up the double helix structure of DNA and the single stranded structure of RNA.
In DNA and RNA, the sugar molecule found within a nucleotide is referred to as deoxyribose. The energy required to power the chemical reactions that build and break the bonds between nucleotides, enabling DNA and RNA to store and transport genetic information, is provided by the phosphate group.
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Why is it possible to do compositional stoichiometry problems in your head?
It is possible to work on composition stoichiometry in your head because the reaction equations in composition stoichiometry are still simple.
A chemical reaction is a process in which one or more substances are converted into one or different substances and produce new products. The characteristics of a chemical reaction are a change in color or smell, gas or precipitate is formed, and there is a change in energy.
Stoichiometry is the science that studies the quantity of a substance in a chemical reaction. These substances include mass, number of moles, volume, and number of particles. In compositional stoichiometry you will understand the quantitative relationship between the masses or the amount of substance between elements in a compound. Like the amount of Nitrogen and Hydrogen substances that combine to form complex ammonia (NH3). So it allows you to calculate it in your brain because the reaction equation is still simple.
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