Sarah knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a ph around 5.7. So the correct option is (B) Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.
Limestone is a sedimentary rock mostly made of calcium carbonate (calcite) or calcium and magnesium double carbonates (dolomite). Small fossils, shell pieces, and other fossilised debris are frequently found in its composition.
Calcium oxide, which is derived from limestone, is used in the manufacture of steel, mining, paper, water treatment and purification, and plastics. Lime is extensively used in agriculture and the production of glass.
The biggest myth about limestone is that it's a delicate stone. Actually, limestone can be anything from extremely hard to soft. It should be selected keeping in mind the final design while paying close attention to its intended usage.
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The complete question is ''Sarah and Evan are in the same science class. The teacher asks the class to design an experiment to determine the effect of acid rain on limestone. Sarah designs an experiment which uses chalk and carbonic acid at a pH of 5.7, because she knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a pH around 5.7. Evan designs an experiment which uses limestone tiles and acid rain collected from the environment. How do these experimental methods compare?
A. Sarah's experimental results will be easier to predict. Evan's results will be impossible to predict since he uses real acid rain.
B. Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.
C. Evan's experimental design will prevent him from being able to form a logical conclusion, whereas a conclusion can be made with Sarah's design.
D. Evan's experiment can be preformed at any time, but Sarah's experiment can only be performed when there is a rainstorm.
A scientific model is a complex representation of a simpler system. True or False?
Answer:
False
Explanation:
A model is a representation of a more complex system.
Answer:
False
Definition:
The scientific model is a condensed depiction of complicated or invisible to the human sight scientific systems, such an atom or a solar system. Although this representation is simplified, it is nevertheless accountable for producing all of the original systems' essence, substance, and behavior. This allows the models to be employed in scientific studies and research and to provide tangible outcomes that accurately reflect the actual systems.
What is a scientific model?
A scientific model is a simplification that roughly represents the real world while making it simple to think about issues, gain clarity and understanding, and perhaps forecast behavior.
Say, "The world is flat!" as an example. Actually, if you were alive 10,000 years ago, this estimate wasn't so awful. In general, everything you see around you suggests that the globe *is* flat, especially if you're living on a large grassy plane. Forget some of the boundary difficulties around the "edge of the globe"; perhaps it just never ends.
Then, though, you could start to see ships if you go to the ocean and stare out across that huge horizon. The sail is shown first, followed by a little portion of the mast, and then the ship's body. Hmm. That must imply that the spacecraft was underneath the earth's "flat surface," or...
The globe that is the earth (Or having a burrito-like form. But for now, let's stick with spherical.) That's fascinating. That would indicate that if I go from one location on Earth to another and keep moving, I would ultimately return to the original location. This proposition is testable!
The Earth is not a perfect spherical, of course. Its core protrudes a little bit. But a sphere is a reasonably good scientific model for the Earth for all everyday practical purposes (with the exception of things like GPS and satellite communications, etc.).
Similar to this, other scientific models should be as straightforward as feasible in order to explain occurrences and offer some level of testable prediction potential.
Thanks,
Eddie
Which nonmetals could form an ionic compound with magnesium with the formula mgx2 (where x represents the nonmetal)?
All halides (nonmetals) could form an ionic compound with magnesium with the formula mgx2.
What are ionic compounds?
A chemical compound known as an ionic compound in chemistry is one that contains ions bound together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions, or cations and anions, the molecule is generally neutral.
The proportional size of the cations and anions determines how an ionic molecule is structured. Salts, oxides, sulphides, hydroxides, and the majority of inorganic compounds are examples of ionic compounds. The electrostatic forces of attraction between positive and negative ions hold together ionic solids.
All halides or other non metallic ions like OH- that require one electron to satisfy their octet that is noble gas configuration will form compounds with the formula MgX2.
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How would you prepare benzylamine (c6h5ch2nh2) from c6h5cooh? more than one step is required.
Benzoic acid in the presence of [tex]SOCl_2[/tex] gets converted to benzoyl chloride which further gets converted to benzamide when treated with ammonia. Benzamide gets reduced to benzylamine by [tex]LiAlH_4[/tex].
Steps involved in the preparation of benzylamine from benzoic acid:
Step 1:
Benzoyl chloride is formed on replacement of [tex]-OH[/tex] group with [tex]-Cl[/tex] group when benzoic acid is treated with thionyl chloride.
Step 2:
Benzoyl chloride converts to benzamide by the replacement of [tex]-Cl[/tex] group with [tex]-NH_2[/tex] group on treatment with ammonia.
Step 3:
Benzamide is reduced to benzylamine in the presence of [tex]LiAlH_4[/tex]. The strong reducing agent converts the carbonyl group (C=O) to [tex]-CH_2-[/tex] group.
Benzylamine is a chemical compound that is organic in nature. A primary amine molecule called benzylamine has benzyl as the N-substituent. This colourless liquid that is soluble in water is a popular starter in organic chemistry and is utilized in the manufacturing process of many medications.
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when you touch outside the breaker containing two chemicals reacting together you feel hot what type of chemical reaction is going on in the breaker explain with an example
Answer:
exothermic chemical reaction.
Explanation:
you can feel it
Does a reaction occur when aqueous solutions of magnesium nitrate and iron(ii) sulfate are combined?
Yes, a reaction occurs.
When Magnesium nitrate Mg(NO3)2 and iron (II) sulphate (FeSO4) are combined, double displacement reaction takes place.
Double displacement reaction - A reaction in which two compounds exchange their cations or anions (ions) to form two new compounds.AB + CD → AD + CB
Ionic equation according to the question-
FeSO4 + Mg(NO3)2 → Fe(NO3)2 + MgSO4
Here, Iron (II) sulphate reacts with Magnesium nitrate to form Iron nitrate and magnesium sulphate by undergoing double displacement reaction.
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Yes, there is a reaction when iron (II) sulphate (FeSO₄) and magnesium nitrate Mg(NO₃)₂ are mixed.
Double displacement reaction occurs when iron (II) sulphate (FeSO₄) and magnesium nitrate Mg(NO₃)₂ are mixed.
Displacement reaction- When a less reactive element is pushed out of a compound that also contains a more reactive ingredient, the result is a displacement reaction. The less reactive element is now pure and left alone following a displacement reaction.
AB + C → A + CB
whereas,
Double displacement reaction- In a double displacement reaction, two compounds swap cations or anions (ions) to create two new molecules.
AB + CD → AD + CB
FeSO₄ + Mg(NO₃)₂ Fe(NO₃)₂ + MgSO₄ is the ionic equation in response to the query.
Here, a double displacement reaction occurs between magnesium nitrate and iron (II) sulphate to produce iron nitrate and magnesium sulphate.
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How many total degrees of freedom are possible for helium?
The total degrees of freedom for helium are three.
The number of ways that a molecule can move or vibrate in space in gaseous phase is known as degree of freedom. The degree of freedom depends on the total number of atoms and the geometrical structure of atoms.
There are three types of degrees of freedom; rotational, translational and vibrational. The degree of freedom for helium is three for translational motion only.
The degree of freedom for monoatomic is three such in the case of helium. A molecule can have different degrees of freedom for different types. For examples, the degrees of freedom for NH3 is 3 for translational and rotational and six for vibrational.
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A buffer resists change in ph when ___________ amount of acid or base is added to it.
Change in pH is resisted by a buffer on addition of small amount of acid or base.
When a small amount of a strong acid or base is introduced to a buffer, the change in pH does not occur. This is accurate provided that the quantity of strong acid or base supplied does not significantly outweigh the quantity of conjugate base and conjugate acid already in the buffer. The buffering capacity will exceed if an excessive amount of a strong acid or basic is added.
A buffer is a substance that can withstand a change in pH when acidic or basic substances are added. Small additions of acid or base can be neutralized by it, keeping the pH of the solution largely constant. For reactions that call for certain and stable pH ranges, this is significant. The pH range and capacity of buffer solutions determine how much acid or base can be neutralized before there is a change in pH and how much pH will vary.
A buffer is a unique liquid that prevents significant pH level fluctuations. Each buffer that is created has a specific buffer range and buffer capacity. The quantity of base or acid that may be added to a buffer before the pH starts to noticeably shift is known as the buffer capacity.
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A+soil+that+is+completely+saturated+has+a+total+density+of+2030+kg/m3+and+a+water+content+of+25%.+(gs=2.73)+what+is+the+density+of+the+solid+(in+kg/m3)?
The density of solid is 2730kg/m^3.
The amount of "stuff" in a certain amount of space is measured by its density. The definition of it is the mass per unit volume.
Given:
Total density = 2030kg/m^3
Water content = 25%
Gs= 2.73
Density of water = 1000kg/m^3
To find:
Density of solid = ?
Formula:
Dry density = moist density / 1 + water content
Density of solid = Gs x density of water
Calculations:
Density of solid = 2.73 x 1000
Density of solid = 2730kg/m^3
Dry density = 2030 / (1+0.25)
Dry density = 2030 / 1.25
Dry density = 1624kg/m^3
Result:
The density of solid is 2730kg/m^3 and the dry density of the soil is 1624kg/m^3.
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When h2so4 is neutralized by naoh in aqueous solution, the net ionic equation is ________.
Answer:
2H+(aq) is the net ionic equation.
How+would+you+prepare+10+ml+of+a+0.25%+m/v+hcl+solution+if+1%+m/v+hcl+was+available?+how+much+1%+m/v+hcl+is+needed?+how+much+distilled+water+is+used
This means that you must take 2.5ml of the stock solution and make up to mark with 7.5 ml of water. You should add acid to water and not water to acid.
What is acid?The terms ACID (atomicity, consistency, isolation, and durability) refer to a set of characteristics of database transactions that are meant to ensure data validity despite errors, power outages, and other unforeseen circumstances.
A transaction is a series of database activities that adhere to the ACID principles and can be thought of as one logical operation on the data in the context of databases. For instance, a transfer of money between bank accounts, even when it involves many adjustments like debiting one account and crediting another, is only one transaction.
Building on previous work by Jim Gray, who identified atomicity, consistency, and durability but not isolation when describing the transaction concept, Andreas Reuter and Theo Härder created the acronym ACID in 1983.
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If 233.76 g nacl in 1 l of water is a 1 m solution, what would the molarity be if 233.76 g of nacol was dissolved in .5 l of water?
If 233.76g NaCl in 1l of water makes a solution of 1M, then the same amount in 5l solution will make 1/5M solution.
What is molarity?
The term "molar concentration" is used to define the concentration of a chemical species, specifically a solute, in a solution. It denotes the quantity of a substance per unit volume of solution. Other synonyms for this phrase include quantity, substance concentration, and molarity.
M = n/V
where, n = no of moles of solute that is solute concentration
V = volume of solution
and, M = molarity of the solution.
If 233.76g of sodium chloride dissolves in 1 litre of water to form a 1 M solution, then the same amount in 5 litres will form a 1/5 M solution.
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During extraction of metals from their molten compounds for example calcium chloride is added to rock salt from the extraction of sodium from sodium chloride. Explain
Explanation:
Sodium is a reactive metal, and so can't be extracted by electrolysis of an aqueous solution.
The main ore of sodium is common salt, sodium chloride.
Calcium chloride is added to the purified ore to lower the melting point from around 800°C to around 600°C, so that energy costs are lowered and this is economical because it saves on electricity used in heating.
Write the chemical symbols for three different atomic cations that all have 12 protons.
Incorrect question .
Corrected question- Write the chemical symbol for three different atomic cations that all have 12 electrons.
The number of protons inside the nucleus always remains constant.
∴Chemical symbol of three different atomic cation that have 12 electrons:
Al+Si2+P3+Atomic cation is the ion with positive electric charge on it, it means it should have more protons than electrons.
Aluminium (Al) has 13 electrons therefore, Al+ will have = 13 - 1 ⇒12 electrons (+1 charge means it will lose 1 electron)Silicon (Si) has 14 electrons therefore, Si2+ will have = 14 - 2 ⇒ 12 electrons. (+2 charge means it will lose 2 electron) Phosphorus (P) has 15 electrons therefore, P3+ will have = 15-3 ⇒ 12 electrons. (+3 charge means it will lose 3 electrons)To learn more about atomic cation refer- https://brainly.com/question/12055269
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Al⁺, Si²⁺ ,P³⁺ are the atomic cations with 12 electrons.
∵The nucleus always contains the same number of protons.
∴Three distinct atomic cations with 12 electrons each have the following chemical symbol:
1. Al⁺
2. Si²⁺
3. P³⁺
An ion or atomic cation with a positive electric charge is thought to have more protons than electrons.
• Aluminum (Al) contains 13 electrons, hence Al+ will have = 13 - 1→ 12 electrons (1 electron will be lost for every additional charge).
• Si2+ will have = 14 - 2→ 12 electrons since silicon (Si) has 14 electrons. (+2 charge signifies electron loss of 2);
• Because phosphorus (P) has 15 electrons, P3+ will have 12 electrons because 15-3. (+3 charge indicates that 3 electrons will be lost.)
Hence, Aluminium, Silicon and phosphorus cations have 12 electrons.
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Your question is incorrect. The correct question is -Write the chemical symbols for three different atomic cations that all have 12 electrons.
Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the
transition from the energy level n = 7 to the level n = 1.
When an electron in a hydrogen atom undergoes the transition from the energy level. The wavelength is 97.3 nm.
What is wavelength?The separation between similar points in successive waves of a waveform signal that have traveled across space or along a wire.
1 / λ = -1.097 x 107 m-1 ( 1/nf2 - 1/ni2 )
λ = wavelength in m
nf = final energy level = 1
ni = initial energy level = 7
1 / λ = -1.097 x 107 m-1 (1/16 - 1) = 1.097 x 107 m-1 (-0.9375)
1 / λ = 1.028 x 107 m-1
λ = 9.73x10-8 m = 97.3 nm
Thus, the wavelength, in nanometers, of the spectral line is 97.3 nm.
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When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?
the conservation of magnetism
the change in solubility in a physical change
the change in melting point in a physical change
the rearrangement of particles in a physical change
Particles can be arranged in a variety of ways. Particles of liquid gold move closer together as it solidifies. Thus, option D is correct.
What happens when liquid convert into solid form?When a liquid is cooled and transforms into a solid, freezing takes place. A solid is created when the particles in a liquid eventually cease moving and settle into a stable configuration.
Attractive forces start to capture particles, and a solid's crystals start to take shape.
Therefore, the rearrangement of particles in a physical change describes When liquid gold becomes a solid, its particles get closer together.
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Answer:
The answer is option D on indeguity
Explanation:
The universal system of measurement for science uses the
Ometric
digital
English
European
system.
An 8.5 gram sample of impure LiF was analyzed and found to contain 2.2 grams of LiF. What was the % Impurity in the sample?
Assertion (A) : The acid must always be added to water with constant stirring.Reason (R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume. *
The acid must always be added to water with constant stirring because the process is highly exothermic and it can be dangerous. Therefore, the assertion is correct but the reason is incorrect.
1.Acid is thoroughly diluted with water before being added.
2.It should be introduced very gradually while being stirred continuously.
3.Acid addition to water is a highly exothermic reaction, releasing a lot of heat in the process.
4.The heat produced by the stirring is absorbed by the water, making the situation safer.
5.The amount of ions in a given volume are more concentrated when an acid and water are combined. However, it has nothing to do with continuously swirling acid into water.
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What is a property of an ionic compound?
Select all that apply.
Responses
remains intact when soaked in water
, , , , remains intact when soaked in water
insulates against heat and electricity
, , insulates against heat and electricity
conducts electricity and heat efficiently
, , conducts electricity and heat efficiently
resists melting at high temperatures
The properties of an ionic compound are as follows:
Conducts electricity and heat efficiently. Resists melting at high temperatures.Thus, the correct options for this question are C and D.
What do you mean by Ionic compound?An Ionic compound may be defined as a type of chemical compound that is significantly composed of ions that are held together by electrostatic forces referred to as ionic bonding.
The properties of ionic compounds are determined by the process through which they dissociate from one another when they dissolve in water. For example, NaCl. They are good conductors of heat and electricity.
Therefore, the correct options for this question are C and D.
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Which compound would have the highest boiling point?
a) ch3ch2ch2ch2ch2ch3
b) ch3ch2och2ch2ch3
c) ch3ch2ch2ch2ch2oh
d) ch3ch2och(ch3) 2
e) ch3och2ch2ch2c
Compound that would have the highest boiling point is c) CH₃CH₂CH₂CH₂CH₂OH.
Pentan-1-ol (CH₃CH₂CH₂CH₂CH₂OH) is an alcohol with boiling point of 137⁰C.
While boiling, liquid pentan-1-ol is changed into gaseous pentan-1-ol.
Alcohols have higher boiling point than ethers, because it can form hydrogen bonds (see the picture below).
Between molecules of water there are hydrogen bonds, which must be brake so water can evaporate.
Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).
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What change would make the model of the atom more accurate?
The change that can make the model of nitrogen atom more accurate is to show 7 neutrons in the nucleus. The correct option is C.
What is an atom?An atom is a matter unit of matter that defines a chemical element distinctively. An atom is made up of a central nucleus one or more negatively charged electrons.
The nucleus is positively charged and encompasses one or more protons and neutrons, which are relatively heavy particles.
Nitrogen is an atom with seven protons, seven neutrons, and seven electrons. The nucleus is made up of neutrons and protons that are all stuck together in the middle of the atom.
The addition0. of 7 neutrons in the nucleus can improve the accuracy of the nitrogen atom model.
Thus, the correct option is C.
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Your question seems incomplete, the complete question is:
A students drawing of a nitrogen atom is shown. What change would make the model more accurate?
A-move the electrons into the nucleus
B-add 2 more protons
C-show 7 neutrons in the nucleus
D-remove 2 electrons
Explain why you do not have to add water to a sealed container?
Explanation:
Opening the container will be difficult due to the low pressure. But, if you manage to get it open, then air from outside will immediately rush in. The pressure will rise up to atmospheric pressure, and the boiling point of water will go back up to 100°C.
A concrete column has a diameter of 380 mm and a length of 2 m. if the density (mass/volume) of concrete is 2.45mg/m^3 Determine the weight of the column in pounds.
The weight of the column is 1224.73 pounds.
r = 380 mm/2 = 190 mm
r = 0.190 m; a radius of a concrete column
l = 2 m; a length of a concrete column
d = 2.45 Mg/m³; density of a concrete
V = r² × π × l
V = (0.190 m)² × 3.14 × 2 m
V = 0.227 m³; volume of a column
m = d × V
m = 2.45 Mg/m³ × 0.227 m³
m = 0.555 Mg
1 Mg = 1000 kg
m = 555.4 kg; mass of concrete
W = 555.4 kg × 9.8 m/s²
W = 5443.25 N
W = 5443.25 N × 0.225 Ibf/N
W = 1224.73 Ibf; weight of a concrete
The weight of an object is the amount of force acting on the object due to gravity. SI unit for weight is newton (N).
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From the weakest to the most energetic, which is the correct order of radioactive rays?
A alpha, gamma, beta
B alpha, beta, gamma
C gamma, beta, alpha
D. beta, gamma, alpha
What is the empirical formula of a compound found to contain 7.353 g al and 6.547 g o?
The empirical formula of a compound found to contain 7.353 g of Al and 6.547 g of O is Al2O3.
We are given that
Mass of Al = 7.353 g
Mass of O = 6.547 g
To calculate the moles of the compounds, we need to divide the given mass by their molar mass
Moles of Al = 7.353/27 = 0.272
Moles of O = 6.547/16= 0.409
Now we need to divide the moles by the least common number i.e, 0.272.
Moles of Al/0.272 = 0.272/0.272= 1
Moles of O/0.272= 0.409/0.272 = 1.5
Now, to convert these values into whole numbers we should multiply them by 2
Moles of Al = 2
Moles of O = 3
Thus, the ratio of Al:O = 2:3
Hence, the empirical formula of a compound found to contain 7.353 g of Al and 6.547 g of O is Al2O3.
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Molarity5. 0.800 moles of sugar are present in 250. ml of solution. determine its molarity (m)?
The molarity of 0.800 moles of sugar in 250 ml of solution is 3.2 M
To solve this molarity problem, the formulas and the procedures that we have to use are:
M = n(solute)/v(solution) L
Where:
M= molarityn = molesv = volumeInformation about the problem:
v = 250 mln= 0.800 molM = ?Converting the volume units from (ml) to (L) we have:
v(solution) = 250 ml * (1 L/1000 ml)
v(solution) = 0.250 L
Applying the molarity formula, we get:
M = n(solute)/v(solution) L
M = 0.800 mol / 0.250 L
M = 3.2 M
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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A student finds two unlabeled jars of white, solid substances. It is believed that one of the jars contains k2so4 and the other baso4. What is a quick means of telling them apart?.
Adding water to each solid quickly separates them; K₂SO₄ is soluble while BaSO₄ is insoluble. K₂SO₄ cannot form a precipitate, whereas BaSO₄ can form a precipitate.
Many factors influence solubility, one of which is lattice energy or the stability of the lattice and bond. The rule now states that bigger anions are stabilized by bigger cations and smaller anions are stabilized by smaller cations.
Since (SO4)²⁻ is a larger anion, the stability of the compound rises as the size of the cation does as we move down the group. As a result, the solubility drops. BaSO₄ is therefore insoluble.
Now, this goes against the trend found for k⁺. K₂SO₄ is an ionic molecule in this instance, and most ionic molecules are soluble in water. Dipoles and the extreme polarity of ionic substances are reasons for their solubility. Although they are held together so firmly that water is unable to separate them, not all ionic substances are soluble in water.
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Worksheet 1.5 significant figures
1.5 contains two significant figures i.e. 1 and decimal number 1.5 .
How to find significant figures ?Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value. We start counting significant figures at the first non-zero digit.
There are 3 rules to determine significant figures ,there are as :
1. Non-zero digits are always significant.
2. Any zeroes between two significant figures digits are significant.
3. A final zero in the decimal portion only are significant.
Hence, 1.5 contains two significant figures .
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X: 250ml of 30% nacl soln. your pharmacy stocks 22% and 40% nacl soln. how may ml of 22% nacl soln would you need to formulate the prescription? (round to the nearest ml)
The amount of ml for 22% NaCl solution required to formulate the prescription is 139ml.
To find the solution need to formulate prescription, the given data's are,
30% of Nacl solution will have 250 ml
Find for 22%.
What is Sodium Chloride (NaCl)?Sodium chloride, or salt, is an ionic substance with the chemical formula NaCl that represents a 1:1 ratio of sodium and chloride ions.
The body that required NaCl also known as salt, Sodium Chloride (NaCl) is critical for proper functioning of the human body.
From the given values,
22/100x + 40/100(250-x) = 30/100 × 250
22x + 40(250 - x) = 30 × 250
22x - 40x = 7500 - 10000
18x = 2500
x = 2500/18
x = 138.89ml
Thus, from the metrics given, it is correct to state that the amount of ml of 22% NaCl solution required to formulate the prescription is 139ml.
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Which one of the following ionic solids would have the largest lattice energy?
a. nabr
b. kf
c. cabr2
d. csi
e. cacl2
Cacl2 has the largest lattice energy.
The lattice energy of CaCl2 is -2195.2 kJ/mol. The calcium salt calcium chloride has a wide range of applications in both home and industrial settings. The molar mass of calcium chloride, which has the chemical formula CaCl2, is 110,983 g/mol. The calcium cation (Ca2+) and two chlorine anions make up an ionic compound (Cl–).
Lattice energy cannot be objectively quantified, although it can be measured using electrostatics or inferred using the Born-Haber cycle.
The size of the ions affects the lattice energy in an inverse manner: the greater the electrostatic attraction between the smaller ions, the greater the lattice energy. Two crucial elements that influence the lattice energy's magnitude are the bonded ions' charge and radius.
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