Add an excess of calcium hydroxide (Ca(OH)₂).
What is the chalk about?Adding an excess of calcium hydroxide (Ca(OH)₂) to the experiment would help to produce the maximum amount of chalk (CaCO₃). Calcium hydroxide is a strong base that can react with carbon dioxide (CO₂) in the air to produce calcium carbonate (CaCO₃).
This reaction is exothermic, meaning it releases heat, which speeds up the reaction. By adding an excess of calcium hydroxide, Jane would ensure that there is enough of the reactant to react with all of the carbon dioxide present in the air and form the maximum amount of chalk.
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Drag each label into the appropriate position to identify which chemical classification it describes. - Steroid - Peptide 1. Utize CAMP DAG, or IP3 systems 2. Bind to receptors in the cells nucleus 3. Require a transport protein 4. Hydrophobic 5. Pass directly through the plasma membrane 6. Hydrophilic 7. Elicit responses over several hours to days 8. Elicit responses almost immediately 9. Require second 10. Bind to membrane bound receptors messenger systems
Peptides are hydrophilic, elicit immediate responses, require secondary messenger systems and binds to membrane bound receptors whereas steroids are hydrophobic, requires a transport proteins, binds to the receptors which are present on the nucleus of the cell.
Steroids are hydrophobic in nature and due to this hydrophobic nature, they are able to pass through the plasma membrane directly. They bind to the receptors which are present in the nucleus and not on the plasma membrane. They do not elicit response immediately but take several hours to even days.
Peptides being hydrophilic cannot cross the plasma membrane directly. They bind to the receptors which are present on the plasma membrane. They use the DAG, cAMP or IP3 systems.
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An apple placed in a sealed
container has a mass of 160
grams. What would the mass of
the apple be after 6 weeks of
decomposition?
A. 160 grams
B. 80 grams
C. 40 grams
The apple weighs 80 grams after 6 weeks of deterioration. The correct answer is option (B).
Does decomposition lose mass?More recalcitrant chemicals are degraded in the latter stages of breakdown. Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. Simply put, mass is a measurement of a body's amount of matter. Matter is everything that has both volume and mass.
Although not linearly, the overall percentage of decomposition was highly correlated with carcass mass. A particle's or an object's mass is a dimensionless number that indicates how much matter is present. The kilogram serves as the standard mass unit in the International System (SI).
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Answer:
the correct answer is A.
Explanation:
Scientists are developing new methods of conservation to preserve species in danger of extinction. Captive breeding programs try to restore the population of a species. Germ plasm is any form of genetic material contained in reproductive or germ cells or plants and animals. Germ plasm banks also knowns as gene banks save sperm, egg or DNA. Farmers also save germ seeds to replant seeds of plants.
13. One way scientists save species in danger of extinction is by:
A logging tropical rain forests
B developing new methods of conservation
C removing species from endangered lists
D abandoning new methods of conservation
Answer:
B. Developing new methods of conservation
Explanation:
Such as the Germ Plasm in the excerpt. This is an example of new conservation methodology
particle derives its name from the fact that it has no electrical charge; it is neutral and found in the nucleus of an atom____
Because it is electrically neutral and can be found in the nucleus of an atom, this particle is known as a neutron. The nucleus contains the neutron, an elementary particle.
Except the atom of pure hydrogen. The fact that the particle has no charge and is electrically neutral gives rise to its name. Neutrons have the highest density. Every atom's nucleus, with the exception of basic hydrogen, is home to a neutron, a subatomic particle. The fact that the particle has no charge and is electrically neutral gives rise to its name. Neutrons have the highest density. Hydrogen is a chemical element with atomic number 1 and the letter H. Hydrogen is the lightest element.
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What i the name of the exothermic proce in which a olvent interact with it olute?
precipitation
olvation
aturation
micibility
Salvation is an exothermic process in which a solvent interact with it solute.
What is SolvationSolvation or solution can be interpreted as a system in which solute molecules are dissolved in a solvent. Water is often called a universal solvent and includes a strong solvent . The composition of the solute and solvent in the solution is expressed as the concentration of the solution, while the process of mixing the solute and solvent to form a solution is called dissolution or solvation. Water is a strong solvent dissolves many kinds of chemical substances . The solubility of a substance in water is determined by whether or not the substance can oppose the strength of the electric attraction between water molecules. Solubility (solvation) is a function of a molecular parameter.
Ionization structure and molecular size Stereochemistry and electronic structure. Everything will affect the action of the solvent and the solute, as in the previous section, water forms hydrogen bonds with ions or with non-ionic compounds, while polar through -OH, -NH groups, or with unbonded electron pairs on an oxygen or nitrogen atom. Ions or molecules will get the sample hydrate and will separate from the chunks of solid matter and that means dissolve.
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if you use too much hot solvent when dissolving your crude compound, how will that impact the recovery of your compound and why?
Recrystalization will occur.The solution may become too diluted for crystals to form if you add too much solvent. Impurities will be captured by a hastily formed crystal's lattice. The crystals that result will also be smaller.
What is Recrystalization?Recrystallization is a physical process used to separate compounds based on how soluble they are. Heating the material to dissolve the compound with impurities in a mixture of a suitable solvent completes the procedure. We can remove the desired chemical or contaminants from the mixture using this method.
The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. The resulting crystals will also be smaller.
This method is used to harden steel in order to eliminate all strain hardening side effects, including the significant plastic deformation brought on by cold working.The crystals that frequently form when the compound precipitates out gave it its name. The natural expansion of larger ice crystals at the expense of smaller ones is another definition of recrystallization.Some commonly effective mixes include diethyl ether-methanol (or ethanol) for polar molecules (particularly esters, alcohols, and hydrocarbons) and diethyl ether-petroleum ether (or benzene) for strongly linked solids (notably amides, alcohols), as well as many natural products.The three main types of recrystallization are;
Single-solvent recrystallization.Multi-solvent recrystallization.Hot filtration-recrystallization.To know more about Recrystalization, refer to:
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how many grams of water are produced when 44 grams of propane react?
When 44 grams of propane reacts, 72.0 g of water is produced.
The molar mass of propane (C₃H₈) is 44 g/mol and that of water (H₂O) is 18 g/mol.
44.0 grams of propane is equivalent to 1 mole of propane.
According to the balanced chemical equation,
C₃H₈+ 5O₂ → 3CO₂ + 4H₂O
1 mole of propane produces 4 moles of water.
So, burning 44.0 g (1 mol) of propane will produce 4 moles of water.
Mass of water = moles x molar mass
Mass of water = 4 × 18 = 72.0 g.
So, the mass of water is 72.0 g.
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Mole Ratio Practice
A chemical reaction's mole ratio, which is determined from the coefficients of the constituent substances in a balanced equation, is a conversion factor between the compounds.
What is the mole ratio?In a balanced chemical reaction, the ratio of any two compounds' mole amounts—measured in moles—is known as the mole ratio. In the balancing chemical equation, the ratios of the molecules required to accomplish the reaction are compared. A balanced equation cannot have a mole ratio calculated. In many chemistry situations, the ratio of reactants to products is calculated using moles.Take a look at the chemical formula N2 + 3H2 2NH3 to see how it balances.In this case, N2 coefficients equal 1.H2 = 3 has coefficients.Indicators for NH3 are 2Input for the chemical equation came from this coefficient's molecular details.In this equation, 1 mole of nitrogen (N2) interacts with 3 moles of hydrogen (H2) to create 2 moles of ammonia (NH3).To Learn more About mole ratio, Refer To:
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Consider the reaction
2A + B C
-
(a) In the diagram here that represents the re-
action, which reactant, A or B, is the limiting reagent?
(b) Assuming complete reaction, draw a molecular-model representation of the amounts of reactants and products left after the reaction. The
atomic arrangement in C is ABA.
Answer:65
Explanation:
PLEASE HELP!!! Lead (II) nitrate as Pb(NO3)2 and potassium iodide as KI combine to form the products shown.
2 KNO3 + PbI2
How many moles of each reactant are involved in the reaction?
(1 point)
Responses
2 moles of lead (II) nitrate and 2 moles of potassium iodide
2 moles of lead (II) nitrate and 2 moles of potassium iodide
1 mole of lead (II) nitrate and 1 mole of potassium iodide
1 mole of lead (II) nitrate and 1 mole of potassium iodide
1 mole of lead (II) nitrate and 2 moles of potassium iodide
1 mole of lead (II) nitrate and 2 moles of potassium iodide
2 moles of lead (II) nitrate and 1 mole of potassium iodide
The number of moles of each reactant involved in the reaction are as follows: 1 mole of lead (II) nitrate and 2 moles of potassium iodide (option C).
What is a chemical reaction?A chemical reaction is said to occur when there is a breaking or formation of interatomic bonds and involves the transformation of one or more substances into others.
This question states that lead (II) nitrate and potassium iodide react to form potassium nitrate and lead iodide as follows:
Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
It can be observed from the above equation that 1 mole of lead nitrate and 2 moles of pottasium iodide are needed on the reactant sides.
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In the activity series, the more active elements are found
(a) at the bottom
(b) in the middle
(c) at the top
(d) both (a) and (c)
Answer:
Number three the answer is d
Scientists want to investigate the effects caffeine on short term memory by randomly assigning 200 volunteers to intake 86mg of caffeine before a memory quiz and the remaining 200 volunteers to intake 86mg of a placebo before taking a memory quiz. The quiz score of each volunteer is recorded.
What is the response variable?
The response variable in this study is the memory quiz score of each volunteer.
The response variable is the outcome of the study that the scientists are interested in measuring and analyzing. In this case, it is the memory quiz score of each volunteer. The memory quiz is used as a measure of the effect of caffeine on short-term memory.
The scores of the quiz will be used to determine if there is a significant difference between the scores of the group that consumed caffeine and the group that consumed the placebo.
The response variable will be used to draw conclusions about the effect of caffeine on short-term memory and it can be quantitative in nature. The scores can be analyzed and compared to understand the relationship between caffeine intake and memory retention.
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estimate the boiling point of a 2m solution of nacl in water.
The boiling point of water is raised by 1.88K when a 2 molal solution of sodium chloride is added to water.estimate the boiling point of a 2m solution of nacl in water.
Pour 11.69 g of NaCl into a suitable beaker (100 mL beaker in this case). Increase the amount to 100 mL by adding deionized water. Add a stir bar to the beaker and leave it on a stir plate for 1 minute, or until thoroughly dissolved. If desired, sterile-filter and transfer to an adequately labeled container. When a 2 molal solution of sodium chloride is added to water, the boiling point rises by 1.88K. Fill an appropriate beaker with 11.69 g of NaCl (100 mL beaker in this case). Add deionized water to bring the total to 100 mL. Place the beaker on a stir plate and leave it for 1 minute, or until totally dissolved. If desired, sterile-filter the solution and transfer it to a properly labeled container.
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Plants such as the venus flytrap produce chemical compounds that break down insects into substances that are usable by the plant. The chemical compounds that break down the insects are most likely.
The chemical substance that the Venus flytrap produces can be thought of as a biological catalyst.
Enzymes can be thought of as biological catalysts.
Plants that break down insects into components the plant can use, like the Venus flytrap, create chemical compounds. Most likely, BIOLOGICAL CATALYSTS are what breaks down the insects' chemical makeup. Among plants, the Venus Flytrap is a carnivore. It possesses a mechanism that captures other species and finally ingests them. It smells bad because of what it consumes. There are various carnivorous plants that use different methods to draw in and capture small animals or species.
This enzyme can be thought of as a biological catalyst that quickens a chemical reaction while maintaining the equilibrium.
The simple fact that the enzymes' actions accelerate up biological reactions within an organism has led to their classification as biocatalysts.
A biological catalyst that aids in turning the insect into material is what the flytrap generated.
As an illustration, consider the salivary enzyme that aids in the conversion of starch to simple sugar.
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To reach an absolute pressure of 3atm, you must dive down (in water) to depth of approximately 20m. Why might someone think that the answer was 30m?.
The gauge pressure at a depth below the surface of a water is 3.0 atm.
If a person cannot tell the difference between gauge pressure and absolute pressure, they might believe the height (depth) is 30 metres.
Given the information below:
A = 3 atm is the atmospheric pressure.
A = 20 metres for height vs depth.
• 30 metres of depth at height.
Scientific evidence
• Gravitational acceleration is 9.8 m/s2.
• Water has a density of 1000 kg/m3.
In order to determine the gauge pressure at a depth below the water's surface:
Gauge pressure can be calculated mathematically using this formula:
P = pgh
where: G is the gravitational acceleration.
Water is at a height (depth) of h.
The formula reads as follows when the supplied parameters are substituted: P = 1000 × 9.8 x 30 Gauge pressure = 294000 Pa
The figure in Pascals would then be converted to atmosphere.
Conversion:
1 atm equals 101325 Pa, and X atm is 294000 Pa.
X = 294000 / 101325 X = 2.90 X = 3.0 atm is the result of cross-multiplying.
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How many molecules are in 0. 25 moles of H2O?.
There are 1.505×10²³molecules in 0.25 moles of H2O.
No of moles= 0.25moles
No of molecules = ?
NA(avogadro constant) = 6.022×10²³molecules
No of molecules =no of moles×NA
= 0.25moles×6.022×10²³molecules
=1.505×10²³molecules
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Which of the following elements is a noble gas?
A) Sodium
B) Chlorine
C) Argon
D) Calcium
Answer:
The correct answer is C.) Argon.
Explanation:
Noble gases are a group of elements in the periodic table that are characterized by their low reactivity and tendency to remain as gases at standard temperature and pressure. Argon is one of the noble gases, along with helium, neon, krypton, xenon, and radon. These elements have full electron shells, which makes them stable and unreactive, and they do not easily participate in chemical reactions.
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Analyze Data In the figure to the left, write the charge of the oxygen atom and the oxygen ion. Write the charge to the left of the word "charge."
The image that is shown is the gain of two electrons by the oxygen atom.
What is an ion?We have to note that when we talk about the term "ion" we are talking about such a specie that can be formed by the loss or gain of electrons. Thus an ion is positive if it formed by the loss of electrons and the ion is negative if it is formed by the gain of electrons.
In the case of the image that we have here, we can see that there is again of two electrons by the oxygen atom and this is how we form the oxygen ion that has ten electrons and eight protons.
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Which orbital is portrayed on the right?
A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.
What's the appearance of the p orbital?A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.Each shell can only carry a certain amount of electrons: the first shell can hold two electrons, the second shell can hold eight electrons (2 + 6) and so on, the third shell can hold 18 electrons (2 + 6 + 10).To learn more about orbital refer to:
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How is 2 ATP produced in the Krebs cycle?.
2 ATP produced in the Krebs cycle from each pyruvate molecule during the conversion of succinyl-CoA to succinate.
In the presence of the enzyme succinyl CoA synthetase, Kreb's cycle only generates 1 molecule of ATP from each pyruvate molecule during the conversion of succinyl-CoA to succinate.
Glycolysis converts one glucose molecule into two pyruvate molecules, both of which enter the Kreb's cycle at the same time.
Thus, when one glucose travels through aerobic respiration, 2 ATP are ultimately created from Kreb's cycle through substrate-level phosphorylation.
The reduced coenzymes NADH and FADH₂ work as intermediary chemicals in the citric acid cycle to supply protons and electrons to the electron transport chain. The subsequent oxidative phosphorylation produced by the electron transport chain produces more ATPs. In addition to producing 2 ATP, the citric acid cycle also phosphorylates its substrate.
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which electrolyte is a major cation in body fluid?a. Potassiumb. Chloridec. Phosphated. Bicarbonate
Potassium is a major cation in body fluid. It is a crucial electrolyte and mineral that is necessary for numerous bodily physiological processes.
What are the functions of potassium?
It performs several tasks, such as:
regulating fluid equilibriumsustaining normal nerve and muscle functionmaintaining cardiovascular healthlowering the risk of high blood pressure and strokeIn order to keep the body's acid-base balance in check, potassium is also crucial.It can be taken as a supplement in addition to being present in many foods, including dairy products, fruits, and vegetables.It aids in the proper operation of muscles and nerves, the regulation of fluid balance, and the maintenance of optimal blood pressure levels. In addition, potassium is necessary for the heart and kidneys to operate properly. A lack of potassium can cause a number of health problems, such as exhaustion, muscle weakness, and irregular heartbeats. Bananas, sweet potatoes, and avocados are some foods high in potassium that you should eat regularly to guarantee appropriate intake of this vital mineral.To learn more about potassium refer to:
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Which relationship is true of an uncharged atom? the number of protons is equal to the number of electrons.
The relationship that the number of protons is equal to the number of electrons is true for an uncharged atom of an element.
Electrons are negatively charged particles with a negligible mass. These negatively charged particles revolve around the nucleus in discrete orbits called shells.
Protons are positively charged particles which have a mass of approximately 1 amu (atomic mass unit). These positively charged particles are present in the center of the atom, inside the nucleus.
When an atom has an equal number of negative (the electrons) and positive (the protons) electric charges, it is called an uncharged atom. As a result of which, the atom's total electric charge is NIL (zero), and hence it is said to be neutral. For example, a carbon atom includes six protons and six electrons, so it's an uncharged carbon atom with an atomic number of 6.
Therefore, all the elements in the periodic table are atoms in their neutral form.
Thus examples of uncharged atoms would be all neutral atoms, such as Nitrogen atom, Oxygen atom, Hydrogen atom, Sulphur atom, Potassium atom, etc.
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Which of the following CANNOT weigh 1 amu? Why?
a. Atoms because they always weigh more than 1 amu
b. Electrons because they are the lightest subatomic particle
c. Protons because they always weigh more than 1 amu
d. Neutrons because they don't have any mass
Answer: Electrons
Explanation: Electrons are much smaller than Protons and Neutrons. Protons and neutrons each weigh about 1 amu.
How many molecules are the in 1.8g of water molecule H2O
The number of the molecules of water is 1.8 g is 6.02 * 10^22 molecules.
What are the molecules?We can be able to obtain the molecules from the Avogadro's number. We know that the number of the molecules that we find in the compound can be gotten by the use of the proposition that was put forward by Avogadro.
Number of moles of the water = 1.8g/18 g/mol = 0.1 moles
We know that;
1 mole of water contains 6.02 * 10^23 molecules of water
0.1 moles of water would contain 0.1 mole * 6.02 * 10^23 molecules/ 1 mole
= 6.02 * 10^22 molecules
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If an element is written in hyphen notation, such as
Phosphorous-32, what would the mass of one mole of
this element be?
The mass of one mole of phosphorus-32 is approximately 31.97 g/mol.
What is Phosphorus-32?The chemical element phosphorus has an isotope called phosphorus-32 (P).Its atomic nucleus contains 32 protons, giving it a unique atomic number.Due to its total of 32 nucleons, phosphorus-32 has a mass number of 32 (protons and neutrons).Because phosphorus-32 is a stable isotope, it does not decay radioactively.mole is frequently created in nuclear reactors, but it can also be acquired naturally.In industrial and environmental investigations, phosphorus-32 is frequently utilized as a tracer to monitor the motion and behavior of chemical molecules.Phosphorus-32 is used in medicine to treat cancer because it generates beta particles that can kill cancer cells.To learn more about phosphorus-32 from the given link:-
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rank these liquids by their expected surface tension. rank from greatest to least surface tension. to rank items as equivalent, overlap them.
The Greatest to low Surface Tens-ion is given as:
Hydrogen bonding > dipole dipole interactions > van der forces.
The surface tens-ion is the ratio of the surface for-ce F and the length L along which for-ce acts.
surface tens-ion, T = F / L
The more the surface force the greater the surface tens-ion. The surface tens-ion depend upon the force of attraction between the molecules. The surface tens-ion dose not depends upon the surface area. It is given as :
Hydrogen bonding > dipole dipole interactions > van der forces.
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what is the approximate residence time for a water molecule in a river?
The residence time for a water molecule in a river is typically between 1 and 5 days.
What is molecule?A molecule is the smallest particle of a substance that can still be identified as that substance. Atoms are held together via molecular bonds to form molecules. Molecules can be as little as two atoms or as large as thousands of atoms. Atoms are held together via molecular bonds to form molecules. Molecules can be as little as two atoms or as large as thousands of atoms. The properties of a molecule are determined by the arrangement of its atoms and the type of chemical bonds that hold them together. Molecules can exist as individual particles or as part of a larger structure. Molecules can be found in all forms of matter including gases, liquids, and solids. They are the building blocks of all living things and play an important role in chemical reactions.
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click on sulfur. this element exists as rings. how many atoms is each sulfur atom bonded to?
Sulfur exists in the form of [tex]S_8[/tex] which occurs as ring structure.
The molecule that represents elemental sulfur in its most prevalent form, a cyclic or ring-like structure made up of eight sulfur atoms, has the chemical formula S8. The S8 ring, which is made up of alternating single and triple covalent connections between the sulfur atoms, is a stable and largely inert structure.
The S8 ring can adopt several conformations since it is sufficiently flexible to rotate thanks to its solitary covalent bond. The S8 ring is a moderately stable molecule that is kept together by van der Waals and covalent forces in both the solid and liquid states. It is a crucial component of numerous minerals and organic compounds found in nature and is employed in a number of commercial and agricultural processes.
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oxides of active metals, such as cao, react with water to form?
Active metals, such as calcium oxide (CaO), react with water to form an oxide-water reaction.
This reaction produces an alkaline solution, which has a pH higher than 7. As a result, the water will become less acidic, and the oxide will be converted into its hydrated form.
This reaction is an important part of the water treatment process, since it helps to reduce the acidity of water and make it safer for drinking.
Additionally, the alkaline solution produced by the reaction can be used to neutralize acidic materials, making it useful for a variety of industrial and environmental applications.
Active metals such as calcium oxide (CaO) are capable of reacting with water to form oxides.
The reaction between the oxides and water can be used in a variety of different applications, such as to create materials with high strength and durability, or to generate power through the combustion of the oxides.
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should you add concentrated acid to water or add water to concentrated acid?
Answer:
Add acid to water, carefully.
Explanation:
"Do as ya aughta
Add acid to wata"
The heat released when water hits concentrated acid can result in the water vaporizing violently, caused the acid to splatter. This is less pronounced when adding acid to water.
