The amount of medication required in grams per pound of body weight is 0.00363 g/lb.
What is the conversion factor between pounds and kilograms?The conversion factor between pounds and kilograms is given below:
1 kg = 2.20462 lb
The data given is as follows:
The prescription medication requirement = 8.00 mg/kg
We use the conversion factor to convert the given amount to grams per pound of body weight.
1 kg = 2.20462 lb
1 g = 1000 mg
Hence;
8.00 mg = 8.00 * 1 g/1000 mg
8.00 mg = 0.008 g
The given amount of medication required in grams per pound of body weight = 0.008 g / 2.20462 lb
medication required in grams per pound of body weight = 0.00363 g/lb
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Complete question:
A prescription medication requires 5.98 mg per kg of body weight. Convert this quantity to the number of grams required per pound of body weight. Express your answer to three significant figures.
A mixture of helium and neon gases is collected over water at 28.0°C and 745 mmHg. If the partial pressure of helium is 368 mmHg, what is the partial pressure of neon in mmHg? (Vapor pressure of water at 28°C = 28.3 mmHg.)
The total pressure of the gas mixture is the sum of partial pressures of the individual gases. Hence, partial pressure of neon is 348.7 mmHg.
What is partial pressure ?Partial pressure of a gas in a mixture of gases is its contribution to the total pressure of the mixture. Dalton states that the total pressure of mixture of two or more gases is the sum of partial pressures of individual gases.
Let P be the total pressure and P1, P2 etc. be the partial pressures.
Then P = P+ P2+ P3.....+.
Given the total pressure of the mixture = 745 mmHg
partial pressure of He gas = 368 mmHg.
vapor pressure of water = 28.3 mmHg
then partial pressure of neon gas = 745 - (368 + 28.3 mmHg) = 348.7 mmHg
Therefore, the partial pressure of neon is 348.7 mmHg.
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What type of reaction is KBr + Cl2 => KCl + Br2?
Answer:
displacement reaction
Explanation:
Byron is a goal had always been to complete
Answer: Run In.
Explanation: It is easy to go back to the first sentence to test all the possible answers then you can eliminate the most brick answer and easily find the remaining answer which makes the most sense.
determine the oxidation state of the metal atom in each of the following complex ions. Ion Oxidation state of metal atom [Sc(OH)4(H2O)2]- [Co(CN)5(NH3)]2- [V(CO)6]2+
The oxidation state of the metal atom in this complex ion can be determined by counting the number of electrons gained or lost by the metal atom.
1. [Sc(OH)4(H2O)2]- The Sc atom starts with an oxidation state of 3+ since it is in the 3rd row of the periodic table and it has 3 valence electrons.
It is coordinated to four oxygen atoms of the OH group and two water molecules, which are -2 and -1 respectively in the oxidation state. Therefore, Sc in this complex ion has an oxidation state of 3+ - 4*(-2) - 2*(-1) = 3+8-2 = +9.
2. [Co(CN)5(NH3)]2- The Co atom starts with an oxidation state of 2+ since it is in the 3rd row of the periodic table and it has 2 valence electrons.
It is coordinated to five nitrogen atoms of the CN group and one ammonia molecule, which are -3 and -3 respectively in an oxidation state. Therefore, Co in this complex ion has an oxidation state of 2+ - 5*(-3) - 1*(-3) = 2+15-3 = +14
3. [V(CO)6]2+ The V atom starts with an oxidation state of 5+ since it is in the 4th row of the periodic table and it has 5 valence electrons.
It is coordinated with six carbon monoxide molecules, which are -1 in the oxidation state. Therefore, V in this complex ion has an oxidation state of 5+ - 6*(-1) = 5-6 = -1
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When heated, KClO3 decomposes into KCl and O2.
2KClO3⟶2KCl+3O2
If this reaction produced 32.2 g KCl, how many grams of O2 were produced?
20.8 grams of O2 were produced.
The balanced equation for the reaction of KClO3 decomposing into KCl and O2 is:
2KClO3⟶2KCl+3O2
This means that for every 2 moles of KClO3 that decompose, 2 moles of KCl and 3 moles of O2 are produced.
We know that 32.2 g of KCl was produced, and the molar mass of KCl is 74.55 g/mol. So we can calculate the number of moles of KCl produced using the formula:
moles = mass / molar mass
moles of KCl = 32.2 g / 74.55 g/mol = 0.432 moles
Since the reaction is balanced, for every 2 moles of KClO3 that decompose, 2 moles of KCl and 3 moles of O2 are produced. As we know that 0.432 moles of KCl were produced, we can use this to find the number of moles of O2 produced:
moles of O2 = (3/2) * moles of KCl
moles of O2 = (3/2) * 0.432
moles of O2 = 0.648
To find the mass of O2 produced, we can use the molar mass of O2 (32.00 g/mol) and the number of moles of O2 that were made:
mass = moles x molar mass
mass of O2 = 0.648 moles x 32.00 g/mol = 20.8 g
So, 20.8 grams of O2 were produced.
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The combustion of ethane (C2H6) produces carbon dioxide and steam.
2C2H6(g)+7O2(g)⟶4CO2(g)+6H2O(g)
How many moles of CO2 are produced when 5.55 mol of ethane is burned in an excess of oxygen?
Answer:
11.1 moles of CO2
Explanation:
2C2H6(g) + 7O2(g)⟶4CO2(g)+6H2O(g)
To find the number of moles of CO2 produced when 5.55 mol of ethane is burned in an excess of oxygen, use the stoichiometry of the reaction.
5.55 mol C2H6 x (4 mol CO2/2 mol C2H6) = 11.1 mol CO2
Therefore, 5.55 mol of ethane is burned in an excess of oxygen produces 11.1 moles of CO2.
Which of the following items found in the laboratory should be securely fastened to a nonmovable object?
A. Biohazard bags
B. Compressed gas cylinders
C. Chemical spill kits
D. Radiation detectors
Option D, Items that include radiation detectors that are discovered in the lab should be safely secured to something immovable.
What additional tiny structures could a urine sample that hasn't been kept develop into an increase in size?The course of the illness was indicated by an increase in the quantity of white blood cells (WBCs), red blood cells (RBCs), or casts in the urine.Bilirubin degrades with time after exposure to light, which might result in false-negative tests. It is advised that samples presented for bilirubin assays be stored in a dim area or gathered in an amber container.Being the most concentrated specimen of the day, the morning urine sample from the first void is preferred for chemical and microscopic investigation. Tests for protein and nitrites, as well as those for specific gravity and the analysis of urine sediment, work better when conducted on concentrated specimens.Option D, Items that include radiation detectors that are discovered in the lab should be safely secured to something immovable.To learn more about lab refer to:
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explain how essential nutrients (water, carbon and nitrogen) are cycled throughout an ecosystem. then identify how that process is different from how energy flows throughout an ecosystem.
Essential nutrients such as water, carbon and nitrogen are cycled throughout an ecosystem in a process known as biogeochemical cycling.
What is ecosystem?Ecosystem is a community of living organisms and their physical environment. It is a complex network of interactions between living and nonliving elements. These elements include air, sunlight, soil, water, plants, animals and microorganisms. Ecosystems are constantly changing and adapting to their environment, and the interactions between their components create a dynamic balance. Healthy ecosystems provide a variety of benefits, including clean air, clean water, and food. They also provide habitats for many species and are an important part of our global environment.
This process involves the movement of these chemicals through different parts of the environment, such as the atmosphere, land, and water, as well as between living organisms and the environment.
The cycling of essential nutrients begins with the breakdown of organic compounds, such as dead plant and animal matter, by bacteria, fungi, and other organisms. This process releases the nutrients back into the environment, where they can be taken up by other organisms or re-enter the atmosphere. The water cycle is the most basic example of this process, as water evaporates from the land and is returned to the ground as precipitation. Carbon is cycled through the atmosphere, land, and oceans in a process known as the carbon cycle, while nitrogen is cycled through the atmosphere, soil, and water in the nitrogen cycle.
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A/An _______ is composed of two or more types of matter that can be present in varying amounts.
A heterogenous mixture is composed of two or more types of matter that can be present in varying amounts.
What is heterogenous mixture?Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
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consider the lewis sturcutres for the follwoing molecules co2 co3-2 no2- no3- . Which molecules are best represented by multiple resonance structures?
CO2, NO2-, and NO3- are best represented by multiple resonance structures.
A Lewis structure is a visual representation of the electrons in a molecule and can be used to predict the reactivity and stability of a molecule. The Lewis structure of a molecule can be determined by following a few simple rules:
The total number of valence electrons in the molecule must equal the sum of the valence electrons of the individual atoms.Each atom should have a complete octet (8 valence electrons)CO2 has two resonance structures because it is a linear molecule with a double bond and two lone pair electrons. CO3-2 is a stable compound and doesn't have any multiple resonance structure.
NO2- and NO3- have multiple resonance structures because they have a nitrogen atom with a lone pair and a double bond with an oxygen atom, which can be represented in different ways.
In summary, CO2, NO2-, and NO3- are best represented by multiple resonance structures because they have multiple ways of representing their electron arrangement. CO3-2 is a stable compound and doesn't have any multiple resonance structure.
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If a sample of glucose (C6H12O6 molecular mass = 180.12 amu/molecule) weighs 4863 amu, how many molecules are in the sample?
Round and enter this answer to ones place. For example ... if the calculated answer was 1546.4, enter 1546
The number of molecules in a sample of glucose that weighs 4863 amu is 1.6253 × 10²¹ molecules.
How to calculate number of molecules?The number of molecules in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number as follows:
no of molecules = no of moles × Avogadro's number
According to this question, a sample of glucose (C6H12O6 molecular mass = 180.12 amu/molecule) weighs 4863 amu. The moles of this sample of glucose can be calculated as follows:
moles = 4863amu ÷ 180.12 amu/molecule
moles = 26.99 moles
No of molecules = 26.99 × 6.02 × 10²³
No of molecules = 1.6253 × 10²¹ molecules.
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P4O10 + 6H2O → 4H3PO4
What is the mole ratio of H2O to H3PO4?
a
2:1
b
1:1
c
3:2
d
4:3
Nickel forms a large number of ammonia salts with the general formula of Ni*(NH₂) Br pH₂O where m. n.and p represent the coefficients in the formula. An analysis of the salt can be obtained if a sample is dissolvedby an acid-base reaction in excess acid and then the excess is titrated with NaOH. - That is, [Ni (NH3)m pH3,O] +mHCl=mCl +pH₂O +(Ni^2+) +mNH4^+,excess HCl + OH = H₂O
The nickel salt, Ni(NH3)m(pH3)o, is a complex compound that can be analyzed through an acid-base reaction.
How to analyze the salt?The salt is dissolved in excess acid (HCl) to form the nickel ion (Ni^2+) and ammonia (NH4^+) along with water (H2O) and the chloride ion (Cl-). This reaction can be represented by the equation: [Ni(NH3)m(pH3)o] + mHCl = mCl- + pH2O + (Ni^2+) + mNH4^+. The excess acid is then titrated with a strong base, such as sodium hydroxide (NaOH), to determine the amount of acid present in the original sample. This can be represented by the equation: Excess HCl + OH- = H2O. This process is known as a back-titration, which allows for the determination of the number of moles of acid present in the original sample of the nickel salt. The coefficients m, n and p in the formula for the nickel salt can be determined by the stoichiometry of the acid-base reaction.To learn more about salt refer :
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Iodine is prepared both in the laboratory and commercially by adding Cl2(g) to an aqueous solution containing sodium iodide.
2NaI(aq)+Cl2(g)⟶I2(s)+2NaCl(aq)
How many grams of sodium iodide, NaI, must be used to produce 78.7 g of iodine, I2?
each sketch below shows three objects with an electric charge. in each case, decide whether there is a net force acting on the object outlined in green. if there is a net force, decide whether it pushes the green-ring object to the left or right. then select the appropriate button under the sketch. for example, if there is a net force pushing the green-ring object in the first sketch to the left, select the left button under the first sketch. if there is no net force on the green-ring object in the second sketch, select the middle button under the second sketch. and so on. 1 3 1 1 1 2 1 1 2
Two negative charges repel each other, but a positive charge attracts a negative charge. The attraction or repulsion is felt along the line formed by the two charges.
Charges that are the same repel each other, whereas charges that are the opposite attract.
1. In this case, all are positive charges which will repel.
Q1Q2 = (+2) (+3) = 6
But the distance (r) is different. Less the distance more will be force. Hence, green ring charge (+3) will move in right direction.
2. In this case, -3 charge will push -2 in right direction while +1 will pull -2 in left direction.
Q1Q2 = (-3)(-2) = 6
Q1Q3 = (-2)(+1) = -2
Magnitude is more with -3 and distance is also less hence, -2 charge will move in right direction.
3. In this case both the charges will attract the middle charge and distance is also same. Hence, +2 charge will move in left direction since magnitude of Q1Q2 is more.
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A group of food scientists is developing a new line of seasonings that are low in salt (NaCl). As part of their research, they synthesize a batch of salt by reacting sodium (Na) and chlorine (Cl2) according to the given reaction.
2Na(s) + CIz(g) - 2NaCI(s)
To make this salt batch, the scientists added 3.2 moles of Cl2 to Na. Assume that there are enough reactants to complete the reaction. Determine the number of moles and molecules of NaCI that are produced.
If 3.2 moles of Cl2 are added to Na, the number of moles of NaCI produced would be 3.2 moles. According to the balanced equation, 2 moles of Na are needed to react with 1 mole of Cl2 to form 2 moles of NaCl. Since 3.2 moles of Cl2 are used in the reaction, 3.2 moles of NaCl will be produced.
In terms of the number of molecules, we can use Avogadro's number (6.022 x 10^23) to convert moles to molecules. Therefore, 3.2 moles of NaCl would be equal to (3.2 moles) x (6.022 x 10^23 molecules/mol) = 1.93 x 10^24 molecules of NaCl.
The percent yield tells us
a
how much product we formed compared to the theoretical yield
b
how much of a product we expect to form
c
which reactant limits the reaction
To solve this we must be knowing each and every concept related to percent yield. Therefore, the correct option is option A among all the given options.
What is percent yield?Chemists utilize the percent yield calculation for analyzing chemical processes. There is an expected outcome for every chemical interaction they deal with. Even with an expected chemical consequence in mind, this does not happen the great majority of the times.
The percent yield equation provides the chemist with a percent of how effective the reaction was already in actuality, as opposed to the maximum outcome predicted. The percent yield tells us how much product we formed compared to the theoretical yield.
Therefore, the correct option is option A among all the given options.
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Help me to solve this chemistry practical..
Match the definition/question with the appropriate answer
Joules (J)
Conservation of Mechanical Energy
Work
Mechanical Energy
W=Fd
Kinetic Energy
Potential Energy
1.
Formula for work
2.
SI Unit for work
3.
using an applied force to make an object move
4.
the energy of an object or substance because of its motion; energy of motion
5.
Stored energy that is associated with the position of an object; energy of position
6.
the sum of the potential energy and kinetic energy an object has.
7.
The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall.
Answer:Joules (J) = 2
W=Fd = 1
Work = 3
Kinetic Energy = 4
Conservation of Mechanical Energy = 7
Mechanical Energy = 6
Potential Energy = 5
Explanation:
i think this is right
What is the mass of a sample of aluminum (specific heat = 0.214 cal/g/*C) that when 300 calories are added to it, its temperature increases 30*C?
The mass of the aluminum sample can be calculated using the equation Q = mcΔT, where Q is the amount of heat added, m is the mass of the sample, and ΔT is the change in temperature. Therefore, the mass of the aluminum sample is calculated as: m = Q/(cΔT) = 300 cal/(0.214 cal/g*C*30*C) = 8.7 g.
consider the compound nh4no3. calculate the percent by mass of each element in the compound. type in each answer using one decimal place. %n
The mass percentage of the nitrogen is 35 %. The mass percentage oxygen is 60%. The mass percentage hydrogen is 5%.
The mass percentage expression is given as :
The mass percentage = ( mass of element / mass of the compound)/ ×100%
The given compound is NH₄NO₃ :
The molar mass of NH₄NO₃, = 28 + 4 + 48
= 80 g/mol
Mass percentage of nitrogen = (weight of N/weight of NH₄NO₃ )×100%
= 28 / 80 × 100 %
= 35 %
Mass percentage oxygen = 48 / 80 × 100 %
= 60%
Mass percentage hydrogen = 4 / 80 × 100 %
= 5%
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Classify the following elements as halogens, alkali metals, alkaline earth metals, or noble gases. Drag the appropriate elements to their respective bins.
Halogens : Br, F
Alkali metals : Fr, Li
Alkaline earth metals : Ca
Noble gases : Kr
1) The halogens belongs to 17 group contains the 6 elements in the periodic table : F, Cl, Br, I, At, Ts.
2) The alkali metals belongs 1st group contains the 7 elements : H, Li, Na, K, Rb, Cs, Fr.
3) The alkaline earth metals belongs to 2nd group in the periodic table contains the 6 elements : Be, Mg, Ca, Sr, Ba, Ra.
4) The noble gases belongs to group 18 in the periodic table contains the elements : He, Ne, Ar, Kr, Xe, Rn, Og.
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How do you think the kinetic energy of a snowboarder as he goes downhill is affected by his mass? How is kinetic energy affected by his speed? Explain your reasoning.
1) As long as the mass remains constant, the kinetic energy is constant.
2) The speed of the snowboarder does change with the kinetic energy.
What is the kinetic energy?We know that the kinetic energy has to do with the kind of energy thyat is possessed by the object because of the fact that the object is in motion. This is different from the kinetic energy that is possessed because of the fact that the object is at a height.
If the mass of the object stays the same as the snowboarder the kinetic energy of the snowboarder would not be affected and so also would the velocity of the snowboarder not be affected while coming down the hill.
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Find the periodic payment R required to amortize a loan of P dollars over t yr with interest charged at the rate of r%/year compounded m times a year. (Round your answer to the nearest cent.)
P = 60,000, r = 4, t = 14, m = 6
The regular payment necessary to repay the $60,000 loan over 14 years while paying interest at a rate of 4% per year compounded 6 times a year is $803.03.
What is interest?Interest is the cost of borrowing money or the return earned from investing money. Interest is computed as a percentage of the principal, which is the amount of money borrowed or invested. When someone borrows money from a lender, the borrower must pay back the principal plus interest. When someone invests money, the investor earns interest on the money they have invested. Monthly, quarterly, yearly, or at maturity, interest payments are all possible. Interest rates can vary widely depending on the type of loan or investment, the creditworthiness of the borrower or investor, and prevailing economic conditions.
The periodic payment R required to amortize a loan of $60,000 over 14 years with interest charged at a rate of 4% per year compounded 6 times a year can be calculated using the formula below:
R = P × r/m[1 − (1 + r/m)^−mt]
R = 60,000 × 0.04/6[1 − (1 + 0.04/6)^−6*14]
R = 803.03
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10 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below. Which one of the following statements is false? N2 (g) + 3 H2 (g) > 2 NH3 (g) A) 2.8 grams of hydrogen are left over. B) Nitrogen is the limiting reactant C) The theoretical yield of ammonia is 6.1 g D) Hydrogen is the excess reactant
Answer: C would be false. The theoretical yield of ammonia is 12 grams, not 6.1 grams.
Explanation:
See the attached document for how the problem needs to be set up to be solved. Understand that we can immediately rule out B and D as answers because they are true as evidenced by our results using stoichiometry. C then becomes our most likely answer, and we can see it's false as our limiting reactant (nitrogen) has a theoretical yield of 12 grams. This would also mean A has to hold true.
Explorers are made of strong, rigid metal that does not bend easily. Explorers are circular in cross section.
A. Both statements are true.
B. Both statements are false.
C. The first statement is true; the second statement is false.
D. The first statement is false; the second statement is true.
The tools of explorers, used in dentistry, have a round or circular cross-section and these are flexible in nature. From the question, the first statement saying it is a rigid body is false, while the second one is true.
Running the tool explorer, for dentistry purposes, or a probe on and over the surface of an enamel, , or a restoration, or a cementum, a particular texture of the surface is generally apparent. With each and every contact with the explorer, a distinguishingly clicking sound may be created. Though the clean enamel is smooth (no sound), the rough cementum or calculus, on being hit by an explorer, makes a scratching noise or clicking. Sometimes, a metallic restoration may make a squeaky noise or have a distinguishingly metalic “ring”. With this use and further experience, differentiations can be made.
The various features of an explorer are;
It is a light-weight, flexible tool or instrument that provides for excellent and useful tactile sensitivity.It is circular in cross-section.It has a flexible wire-like end called the working end.The tip of this end or the terminal end (1-2 mm long working end) has a sharp point.Functional Shank - It is the first bend in the shank of the explorer, up to the flexible terminal end (working end).Lower or Terminal Shank - this needs to be parallel to the long axis of the tooth while explorer in use.Learn more about dentistry here:
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Write a note on
(i) Cannizaro reaction
(ii) Stephen reaction
Chemical reactions like Canizzaro reaction involves a chemical reaction which involves base-induced disproportionation of two molecules of non-enolizable aldehyde to give a primary alcohol and a carboxylic acid while Stephen reaction involves the preparation of aldehydes from nitriles using tin(II) chloride,hydrochloric acid and quenching the resulting iminium salt with water.
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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1. A chemist has 2 samples of hydrates. When heated, they lose a different percentage of their original mass. Are they the same or different hydrates? Explain.
2. Cobalt chloride paper is used to test for the presence of water leaking through tiny
cracks in pipes or porcelain.
A. When moisture is present, the test paper goes from blue to pink. Which color
is the hydrated form of cobalt chloride and which color in the anhydrous form?
B. Cobalt chloride paper is carcinogenic. What does that mean? Explain why the
paper should be handled with care
Answer:
1.The two samples of hydrates are likely to be different hydrates. Hydrates are compounds that contain water molecules that are chemically bound to another compound, and each hydrate can have different properties, including their water content and their mass loss when heated. The fact that the two samples lose a different percentage of their original mass when heated suggests that they are different hydrates.
2.A. The hydrated form of cobalt chloride is pink or red, and the anhydrous form is blue. B. Carcinogenic means that a substance has the potential to cause cancer. The cobalt chloride paper should be handled with care because it can be toxic if ingested or inhaled, and it can cause skin and eye irritation.
Chemistry - Precipitation Reactions
The reactions that would lead to the formation of a precipitate are the reactions a, c and d.
What is a precipitate?We have to note that when a reaction occurs that we must be able to have a product from the reaction and the product of the reaction would depend on the kind of species that were combined in the reaction.
If the combination of the reactants that we have would lead to the formation of a product that is insoluble when we mix two products that are soluble then we call the insoluble product the precipitate.
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You calculated a volume from a density and mass, and the volume is 5200 L. You know there should be 2 significant figures in this answer. It would be best to report this number in standard decimal notation, 5200 L, because the number is not very big scientific notation, 5.2 x 103 L, because it is a big number either standard decimal notation or scientific notation is fine the number written out, five thousand two hundred liters scientific notation, 5.2 x 103 L, so the significant figures are clear
A volume from a density and mass is 5.2.
The best way to notate significance?To write extremely large or extremely small numbers, use scientific notation. When a number in the range of 1 to 10 is multiplied by a power of 10, the result is represented in scientific notation. The scientific notation for 650,000,000, for instance, is 6.5 108.
The most significant number in the number is where it rounds to. If you want to round up to one significant figure, look at the first non-zero digit. If the number is rounded to two significant figures, look at the digit that comes after the first non-zero digit.
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