Problem 1:
we need 80 g of the 15% solution and 120 g of the 20% solution.
Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.
x + y = 200 (total mass of the two solutions)
0.15x + 0.2y = 0.17(200) (total amount of solute in the two solutions)
Solving these equations, x = 80 g and y = 120 g.
Therefore, we need 80 g of the 15% solution and 120 g of the 20% solution.
Problem 2:
we need 120 g of the 18% solution and 180 g of the 5% solution.
Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.
x + y = 300
0.18x + 0.05y = 0.07(300)
Solving these equations, x = 120 g and y = 180 g.
Therefore, we need 120 g of the 18% solution and 180 g of the 5% solution.
Problem 3:
The mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.
The total mass of the final solution is 200 g + 350 g = 550 g.
The total amount of solute in the final solution is:
0.15(200 g) + 0.20(350 g) = 65 g + 70 g = 135 g.
Therefore, the mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.
Problem 4:
The mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.
The total mass of the final solution is 300 g + 35 g = 335 g.
The total amount of solute in the final solution is:
0.15(300 g) + 35 g = 75 g + 35 g = 110 g.
Therefore, the mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.
Problem 5:
The mass percentage of the final solution is 18.18%.
Calculate the final mass of the solution:
Final mass = 400 g + 150 g = 550 g
Calculate the mass of solute in the 25% solution:
Mass of solute = 0.25 x 400 g = 100 g
Calculate the mass percentage of the final solution:
Mass percentage = (mass of solute ÷ final mass) x 100%
Mass percentage = (100 g ÷ 550 g) x 100%
Mass percentage = 18.18%
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In an aqueous solution of magnesium bromide, the solute is
In an aqueous solution of magnesium bromide, the solute is magnesium bromide and the solvent is water.
Aqueous solution of magnesium bromideThe solute in an aqueous solution of magnesium bromide is the solid material, in this case magnesium bromide, dissolved in a liquid, which is the solvent. In this case, the solvent is water. Water is an excellent solvent because of its ability to form hydrogen bonds with other molecules, which allows it to dissolve many different substances.
In addition, it is a polar molecule, meaning that one end of the molecule has a slightly positive charge while the other end has a slightly negative charge. This polarity allows water molecules to interact with molecules of other substances, including magnesium bromide, which is also a polar molecule, allowing it to dissolve in the water.
The interaction between the polar water molecules and the polar magnesium bromide molecules causes the magnesium bromide to break up into its component ions, forming a solution. The ions are then surrounded by water molecules, which keeps them in solution until the solution is evaporated.
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Which statement is one of the assumptions of Kinetic Molecular Theory regarding gasses?
A Collisions between gas particles are inelastic.
The temperature of the gas depends on the average potential energy of the gas particles.
Gas particles are much larger than the distance between them.
The volume of a gas sample mostly consists of empty space between the moving gas particles.
The statement that "The volume of a gas sample mostly consists of empty space between the moving gas particles" is one of the assumptions of the Kinetic Molecular Theory regarding gases.
What is Collision?
There are different types of collisions, depending on the nature of the objects involved, the speed and direction of their motion, and the type of contact that occurs. For example, elastic collisions are those in which the total kinetic energy of the colliding objects is conserved, meaning that no energy is lost or gained during the collision. In contrast, inelastic collisions are those in which some of the kinetic energy is transformed into other forms of energy, such as heat or sound.
The Kinetic Molecular Theory is a model that describes the behavior of gases. One of the main assumptions of this theory is that gas particles are in constant random motion and move in a straight line until they collide with other particles or the walls of their container.
Another important assumption of this theory is that the volume of a gas sample mostly consists of empty space between the moving gas particles. This means that gas particles are assumed to be very small compared to the overall volume of the gas sample. Therefore, the particles do not occupy all of the available space in the container, but instead only occupy a small portion of it.
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Bromophenol blue is another common acid-base indicator which changes color from yellow in acidic solution to blue in basic solution. The pH values for this indicator are in a range of approximately 3.0 to 4.6. Instead of using phenolphthalein in the CH3COOH-NaOH titration, if bromophenol blue was used, would the calculated molarity of acetic acid be higher, lower, or the same? Explain.
Answer:
It would be higher
Explanation:
If bromophenol blue was used instead of phenolphthalein in the CH3COOH-NaOH titration, the calculated molarity of acetic acid would be higher. This is because the pH range for bromophenol blue is lower than that of phenolphthalein (approximately 3.0 to 4.6 compared to 8.2 to 10.0). Therefore, the endpoint of the titration (where the indicator changes color) would occur at a lower pH for bromophenol blue, indicating that more NaOH has been added to neutralize the acetic acid. This would result in a higher calculated molarity of acetic acid.
5.0 L of a gas goes from 1.0 atm to 1.3 atm.
Calculate the final volume of this gas.
A 6.5 L
B 0.26 L
C 4.1 L
D 3.8 L
Answer: D) 3.8 L
Explanation:
Boyles law
P1v1=p2v2
V2= p1v1/p2
v2= 1.0 x 5.0 /1.3 = 3.84 L
0.0002844 moles of water to individual water molecules.
One litre (L) of water (H2O) weighs 1,000 g and has a molar mass of 18 grammes (g). The term "mole" is frequently used to refer to a molecular weight. Hence, 55.6 moles more water are present in 1 litre of water.
How are moles transformed into molecules and mass?How do you translate mass into moles using a formula. By dividing the number the molecules by Avogadro's number, one can determine the number of moles inside a given number of substance molecules. When dividing the mass even by formula mass given in g/mol, one can determine the number de moles in a given quantity of substance.
How are H2O molecules calculated?Using the periodic tables, we can calculate the atomic mass of a elements. We find that hydrogen has an atomic weight of 1, whereas that for oxygen is 16. To calculate the molecular weight of a single water molecule, we add the contributions from each atom, which equals 2(1) + 1(16) Or 18 gram/mole.
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Electrochemical cells generate electricity from which of the following? Select all that apply.
electron transfer
flow of electrons
dissolving an ionic compound
redox reactions
By a redox reaction that involves the transfer of electrons, often through the dissolution of an ionic substance, electrochemical cells produce electricity from the flow of electrons.
What fuels the production of energy by electrochemical cells?In electrochemistry, redox or oxidation-reduction reactions, in which electrons travel from one element to another, can produce electricity. Redox processes involve the transfer of electrons from one substance to another.
In what element are electrochemical cells made?Batteries use a very significant class of oxidation and reduction reactions to produce useable electrical energy. Using solutions of respective sulphates, copper and zinc metals can be combined to create a straightforward electrochemical cell.
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Which of the following could be a useful IPM monitoring strategy to reduce crop damage from pests?
A.mating disruption devices B.noisemakers C.pesticides D.forecasting software
Answer:
C. pesticides
Explanation:
hope it helps :)
An emission spectrum has a line in the blue region. How does this occur in the atom?
A. An electron ABSORBS a photon as it goes from a HIGHER TO LOWER energy level.
B. An electron EMITS a photon as it goes from a HIGHER TO LOWER energy level.
C. An electron EMITS a photon as it goes from a LOWER TO HIGHER energy level.
D. An electron ABSORBS a photon as it goes from a LOWER TO HIGHER energy level.
B. An electron EMITS a photon as it goes from a HIGHER TO LOWER energy level.
When an electron in an atom drops from a higher energy level to a lower energy level, it releases energy in the form of a photon.
What is Spectrum?
In science, the term "spectrum" is often used to describe the range of colors of visible light, known as the "visible spectrum," which includes all the colors of the rainbow. This spectrum is produced when white light is dispersed into its component colors by a prism or other means.
This energy is specific to the atom and its electron configuration, which is why each atom emits a unique set of wavelengths, creating a distinct emission spectrum.
Since the emission spectrum in the question has a line in the blue region, it means that the energy released by the electron corresponds to a specific frequency or wavelength in the blue region of the visible spectrum.
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What is the hydroxide ion concentration of a solution
with a pOH of 5.0?
Select one:
a 5.0 x 10¹¹ M
b 1.0 x 105 M
c 1.0 x 10⁹ M
d 1.0 x 109 M
Answer: 1.0 X 10^-5 M
Explanation:
to change pOH to OH- it is judt 1 X 10-pOH
so it is 1 x 10^-5
For the following chemical reaction:
In the laboratory, a chemist mixed aqueous barium chloride with aqueous potassium oxide which produced solid barium oxide and aqueous potassium chloride
A. Write the complete balanced chemical equation, including phase labels.
B. Identify the type of reaction that has occurred.
C. Identify the indicator that tells you a chemical reaction has occurred.
A. The balanced chemical equation with phase labels is: BaCl2 (aq) + K2O (aq) → BaO (s) + 2KCl (aq)
B. This is a double displacement or metathesis reaction, as the cations and anions of the reactants switch places to form new compounds.
C. The indicator that a chemical reaction has occurred is the formation of a solid (BaO) and the disappearance of the reactants (BaCl2 and K2O) as they react to form products (BaO and KCl).
What is balanced chemical equation?A balanced chemical equation is a representation of a chemical reaction using chemical formulas of the reactants and products, and coefficients to indicate the relative numbers of each.
The coefficients are used to balance the equation such that the number of atoms of each element in the reactants is equal to the number of atoms of the same element in the products.
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For the following diagram, select all statements that are true. (Picture provided)
According to given Information:
The energy change of the reaction is -20kJ is true statement, This is exothermic reaction.
What is exothermic?Exothermic meaning that the products of the reaction have lower energy than the reactants.
The negative value of the energy change (-20kJ) indicates that energy is released during the reaction.
What is energy change?Energy change refers to the difference in energy between the products and reactants of a chemical reaction. If the energy change is positive, it means that energy is absorbed by the reaction and the reaction is endothermic.
If the energy change is negative, it means the energy is released by the reaction and the reaction is exothermic. The magnitude of the energy change provides information about the amount of energy that is released or absorbed during the reaction
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reaction is third order for reactant A and zero order for reactant B. If you quadruple the concentration
of A, what happens to the reaction rate? If you quadruple the concentration of B, what happens to
the reaction rate?
Regardless of the reactant B concentration, the reactant rate remains constant. As a result, the response rate is unaffected by increasing B's concentration by a factor of four.
In chemical, what is concentration?The amount of a substance's solute in a specific amount of solution is how concentrated it is. Molarity, or the amount of molecules of solute in one liter of solution, is a common unit of measurement for concentrations.
What exactly are meditation and focus?Focusing for an extended amount of time on one thing without interruption is meditation. Concentrating the mind on a specific object is the basic exercise of concentration that all meditations begin with. After some practice, concentration can eventually turn into meditation when the mind is calm and not easily diverted by other thoughts.
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A 25.0 kg iron weight lifting plate has a volume of 3180 cm3 . what is the density of the iron plate in g/cm3?
Answer:
The density of a substance is given by dividing the mass by the volume.
The S.I units of density are kg/m³, but can be measured by other units such as g/cm³
The mass of the iron is 29 kg or 29000 g
Therefore; Density = 29000 g/ 3680 cm³
= 7.880 g/cm³
Hence, the density of the iron plate is 7.880 g/cm³
Explanation:
What's the difference between magnesium and Aluminum?
Answer:
The key difference between aluminum and magnesium is that the aluminum is a corrosion resistant metal whereas magnesium is not. Magnesium and aluminum are two chemical elements that we can categorize as metals in the periodic table. Both are naturally occurring metals in different mineral forms.
Explanation:
1.Explain the Theory of Plate Tectonics and provide three observations about the earth
that provide evidence to support the theory. Describe how plate tectonics cause
major geological events such as ocean basins, earthquakes, and volcanic eruptions.
Be sure to:
• Use science terms appropriately
.
• Organize and develop your ideas effectively
• Choose your words carefully
.
• Edit your writing for grammar, mechanics, and spelling
The Theory of Plate Tectonics is a scientific theory that explains how the Earth's outer shell is composed of several large plates that move and interact with each other over time.
What is the theory of plate tectonics?Three observations about the Earth that provide evidence to support the Theory of Plate Tectonics are:
Earthquakes: Earthquakes occur when the movement and interaction of the tectonic plates cause rocks to fracture and shift. These seismic events are most common along the boundaries of the tectonic plates, where the movement and interaction are most pronounced. The distribution of earthquakes around the world is consistent with the theory of plate tectonics.
Volcanic Activity: Volcanic activity is closely related to the movement of tectonic plates. Many of the world's most active and well-known volcanoes are located near plate boundaries, where the movement and interaction of plates lead to the formation of magma chambers and the release of volcanic material. This relationship between volcanoes and plate boundaries supports the theory of plate tectonics.
Continental Drift: The theory of plate tectonics also explains the phenomenon of continental drift, which refers to the movement of the Earth's continents over time. According to this theory, the continents are part of the tectonic plates and have moved and shifted over millions of years. The fit of the coastlines of Africa and South America is a well-known example of continental drift and supports the theory of plate tectonics.
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What could be the effects of polluting the water in a small mountain stream?
(A) the pollutants could hurt the fish living in the stream
(B) the pollutants could hurt the vegetation growing along the stream
(C)the pollutants could hurt the organisms living in the lake that the stream feeds into
(D)all of the above
Answer:
Explanation:
The pollutants can cause algae to grow quickly. These 'blooms' of algae may produce toxins that harm other life in the river. When the algae die and decay, this uses up much of the oxygen in the stream. Without enough oxygen in the water, invertebrates and fish will suffocate .
Answer:
D, all of the above.
Explanation:
Pollutants have many bad effects on living beings around. All of stated in the answer options makes sense.
Please help :) almost due
The substance is lithium (Li).
Lithium has an atomic number of 3, which corresponds to the number of protons in its nucleus.The atomic masses or mass numbers of the three isotopes of lithium are 6, 7, and 8, respectively. This indicates that the number of neutrons in the nuclei of these isotopes varies.The three isotopes of lithium, 6 Li, 7 Li, and 8 Li, all have three protons in common, but have varying numbers of neutrons in their nuclei, resulting in distinct atomic weights.Isotopes
Isotopes are atoms of the same element with variable numbers of neutrons but the same number of protons in their nucleus.
Hence, although having different atomic masses, they have the same atomic number.
The physical characteristics of an element's isotopes can differ from their chemical characteristics because of their varied atomic masses.
Isotopes include, for instance:
Carbon: There are three isotopes of carbon: carbon-12, carbon-13, and carbon-14. While Carbon-14 is a radioactive isotope, Carbon-12 and Carbon-13 are stable isotopes.There are three isotopes of hydrogen: hydrogen-1 (also known as protium), hydrogen-2 (sometimes known as deuterium), and hydrogen-3 (also known as tritium). Tritium is a radioactive isotope, whereas protium and deuterium are stable isotopes.Three oxygen isotopes are oxygen-16, oxygen-17, and oxygen-18. The most prevalent isotope is oxygen-16.learn more about isotopes here
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You are now told that element X is in period 2 and element Y is in period 1.
What is the chemical symbol for elements X and Y?
converting moles to mass in grams using dimensional analysis
1. 0.0728 mol to Silicon
2. 5.5mol of H2O
3) 0.0728 of Ca(H2PO4)2
Answer:
Explanation:
1) 0.0728 x (28.086 g Si/ 1mole Si) =2.04 g Si
2) 5.5 mol H20 x (18g H20/1mole H20) = 99 g H2O
3) 0.0728 moles Ca(H2PO4)2 x ( 234 g/ 1mole) = 17.04 g Ca(H2PO4)2
!!(100 points)!! For each of the following chemical formulas, identify the elements present and the number of atoms of each element present in each molecule of the substance: H2SO4, Ca(NO3)2
Answer:
H2SO4 Chemical Name
It contains two atoms of hydrogen, one atom of sulphur, and four atoms of oxygen. It has an atomicity of seven.
Calcium Nitrate is made up of three different elements and contains a total of nine atoms. This compound's formula is Ca(NO3)2. There is one calcium atom, two nitrogen atoms, and there are six oxygen atoms in calcium nitrate.
For the following chemical reaction:
In the laboratory, a chemist mixed aqueous barium chloride with aqueous potassium oxide which produced solid barium oxide and aqueous potassium chloride
A. Write the complete balanced chemical equation, including phase labels.
B. Identify the type of reaction that has occurred.
C. Identify the indicator that tells you a chemical reaction has occurred.
Answer:
A. The complete balanced chemical equation, including phase labels, for the reaction is:
BaCl2 (aq) + K2O (aq) → BaO (s) + 2KCl (aq)
B. The type of reaction that has occurred is a double displacement or metathesis reaction. In this reaction, the barium cations (Ba2+) and potassium anions (K+) exchange partners, resulting in the formation of solid barium oxide (BaO) and aqueous potassium chloride (KCl).
C. The indicator that tells you a chemical reaction has occurred is the formation of a solid precipitate. In this reaction, the solid barium oxide (BaO) that forms is a clear indication that a chemical reaction has occurred. Additionally, the fact that the reactants are aqueous and the products include both a solid and an aqueous solution also indicates a chemical reaction has taken place.
A buffer solution is made using weak acid, HA, with a pKa of 6.98. If the ratio of [A-] to [HA] is 1.0 x 10^3, what is the pH of the buffer
Mass of 8.46x10^24 atoms of fluorine is 266.95g.calculate the atomic mass of fluorine
Answer:
The atomic mass of fluorine is 18.9984 g/mol.
Explanation:
1. Calculate the number of moles of fluorine:Mass of 8.46x10^24 atoms of fluorine = 266.95gOne mole of fluorine contains 6.022x10^23 atoms. Therefore, the number of moles of fluorine = 8.46x10^24 / 6.022x10^23 = 14.05 moles
2. Calculate the atomic mass of fluorine:Atomic mass of fluorine = mass of one mole of fluorine= 266.95g/14.05 mol= 18.9984 g/mol Therefore, the atomic mass of fluorine is 18.9984 g/mol.
Label each of the three parts of this process with a brief description of what the part shows.
The three parts are:
Substrate: The reactants that bind to the enzyme are called substrates. These are the molecules that are acted upon by the enzyme.Enzyme-substrate complex: The complex formed when the substrate binds to the active site of the enzyme. This complex helps to break bonds in the reactants and form new bonds, changing the substrates into products.Product: The end result of the enzyme-catalyzed reaction, formed after the enzyme releases the products.What is the enzymes about?This passage describes the role of enzymes in biological processes. Enzymes are protein molecules that act as catalysts, speeding up chemical reactions without being used up or changed in the process. They do this by binding to specific reactant molecules, called substrates, at a specific site on the enzyme molecule called the active site.
Only substrates that are shaped to fit the active site can bind to the enzyme. When the enzyme and substrate bind together, they form an enzyme-substrate complex, which helps to break bonds in the substrate molecules and form new bonds, resulting in the formation of products.
Therefore, The enzyme then releases the products and is free to bind with other substrates and repeat the process. The passage also notes that enzymes are important in cell processes that supply energy and that their activity can be affected by factors such as pH and temperature.
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See text below
reactions in the body. Like all catalysts, enzymes
up by the chemical reaction. They can be used again. Also, most enzymes act in just one type of reaction. For example, the enzyme amylase is found in saliva. Amylase helps begin the process of food digestion in the mouth.
The figure below shows how an enzyme works. The reactants that bind to the enzyme are called substrates. The specific location where a substrate binds on an enzyme is called the active site. The substrate and active site are shaped to fit together exactly. Only substrates shaped to fit the active site will bind to the enzyme.
The bond between the enzyme and substrates creates the enzyme-substrate complex. This complex helps to break bonds in the reactants and form new bonds, changing the substrates into products. The enzyme then releases the products.
Enzymes are the chemical workers in cells. The actions of enzymes enable cell processes that supply energy. Factors such as pH and temperature affect enzyme activity.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Substrate
Active sites
Substrate Enzyme
Biology online biologygmh.com
Product
Enzyme-substrate complex
Product
Chap
Pi
4
What physical property of matter can be measured using the triple beam balance?
A
volume
B
mass
C
height
D
length
SUBMIT ANSWER
Answer:
B) Mass- I searched it up
Which one is the most polar based on their Lewis structure: Hydrochloric acid (HCl) or hydroiodic acid (HI)?
Since there is a larger difference in electronegativity between hydrogen and chlorine than between hydrogen and iodine, hydrochloric acid is more polar than hydroiodic acid.
Is the atom hydrochloric acid, HCl, a polar one?A polar substance is HCl. This occurs because the more electronegative Chlorine (Cl) atom in the HCl molecule does not evenly share the bonding electrons with the hydrogen atom. (H). However, owing to the molecules' two atoms' similar electronegativity, H2 and Cl2 are not polar.
Which type of material is hydrochloric acid—polar or nonpolar?Because chlorine is more electronegative than hydrogen, it draws the bonded electron pair closer to it and acquires a partial negative charge, whereas hydrogen acquires a partial positive charge, making chlorine (hydrochloric acid) a polar molecule.
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A block of aluminum occupies a volume of 28.0 mL and weighs 85.7g. What is its density?
Explanation:
The density of a substance is defined as its mass per unit volume. In this problem, we are given the volume and the mass of the aluminum block, so we can calculate its density as follows:
Density = Mass / Volume
Substituting the given values, we get:
Density = 85.7 g / 28.0 mL
Simplifying this expression, we get:
Density = 3.06 g/mL
Therefore, the density of the aluminum block is 3.06 g/mL
Answer:
3.06
Explanation:
How many milliliters of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 m HNO3? _____mL
Answer: Therefore, 70.7 mL of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 M HNO3.
Explanation:
To prepare 3.50 L of 0.200 M HNO3, we need to calculate the amount of HNO3 required and then determine the volume of 9.89 M nitric acid solution needed to prepare this amount of HNO3.
The amount of HNO3 required can be calculated using the formula:
amount of HNO3 (in moles) = volume of solution (in liters) x concentration of HNO3 (in moles per liter)
Substituting the given values:
amount of HNO3 = 3.50 L x 0.200 mol/L = 0.700 mol
Now, we can use the amount of HNO3 and the concentration of the nitric acid solution to calculate the volume of the nitric acid solution needed:
volume of nitric acid solution = amount of HNO3 (in moles) / concentration of nitric acid solution (in moles per liter)
Substituting the given values:
volume of nitric acid solution = 0.700 mol / 9.89 mol/L = 0.0707 L
Finally, we can convert the volume to milliliters:
volume of nitric acid solution = 0.0707 L x 1000 mL/L = 70.7 mL
Therefore, 70.7 mL of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 M HNO3.
Regenerate response
Which statement best describes the law of conservation of mass?(1 point)
A) Reactants in a chemical reaction rearrange to form a new substance or substances.
Not college level lol
B) Reactants and products cannot escape from a closed system.
C) Matter cannot be created or destroyed in a chemical reaction.
D) Chemical symbols are used to show atom balance before and after a reaction.
Lesson name) Balanced Chemical Equations Quick Check.
The students created a special type of
white powder was a
began to change. The
they were evenly
called a
that was added to water which is the universal
dissolve
the mixture
began to get smaller and spread out until
. As the powder began to
in the water.
The
Think Like a Scientist: What was the mass of this solution?
Make a hypothesis: What was the white powder?
Plaster of Paris, also known as calcium sulphate hemihydrate (CaSO4 1/2H2O), is the white powder.
What makes water a "universal solvent"?Water has a much greater variety of natural solvent qualities than any other liquid, earning it the moniker "universal solvent." Yet not all substances can be dissolved by water. For instance, hydroxides, fats, or waxes cannot be dissolved by water because oppositely charged particles are not particularly soluble in it.
Why is water regarded as such a crucial solvent?Water is regarded as a significant solvent since it has a wide range of necessary for life compounds that it may dissolve. Before they can be eliminated from the body, waste materials must first be dissolved in water.
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