Echo: When a sound wave is created in the air, some of it is reflected back to the listener while some of it is absorbed after hitting a reflector. Echo is the name for this reflected sound.
Utilizations for Echo:
1. Bats use the echolocation method to find their way because they are unable to see with their eyes. Bats can determine whether an object is in front of a sound by listening to how it is reflected. It uses this method when hunting its prey.
2. This method is also employed to determine undersea distance and ocean depth.
3. Estimating the separation between hills and mountains is also helpful.
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what kind of compound would 5A and 7A make
In periodic table group 5A consist of nitrogen, phosphorus, arsenic and the group 7A consist of all the halogens.
What is periodic table ?The periodic table is a table form of chemical elements arranged according to atomic number, starting with hydrogen and ends to oganesson, which has the highest atomic number.
Because they are arranged in table form of the elements, it is known as the periodic table. They're present in rows and columns. Periods and Groups are the names given to the horizontal rows that comes from left to right and the vertical columns that comes from top to bottom.
Thus, Group 5A contain nitrogen, phosphorus , arsenic compounds while in group 7A contain all the halogens.
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the standard gibbs free energy of formation of is zero. (a) h2o(l) (b) k(s) (c) cl2(g) the standard gibbs free energy of formation of is zero. (a) (b) (c) (a) only (b) only (c) only (b) and (c) (a), (b), and (c)
The standard Gibbs free energy of formation of is zero are option (b) K(s) and (c) Cl₂(g).
Gibbs free energy may be more than zero, much less than zero, and identical to zero. If Gibbs free energy is more than zero the response is a nonspontaneous reaction. If Gibbs free energy is less than zero the reaction is a spontaneous reaction.
The usual Gibbs free energy of formation of a compound is the exchange of Gibbs unfastened energy that accompanies the formation of 1 mole of that substance from its issue elements, of their well known states.
Gibbs free energy, G is a price that defines how spontaneous a response is, with a poor fee which means the reaction is spontaneous, and a advantageous cost that means the reaction is nonspontaneous. This fee is the combination of enthalpy and entropy.
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(a) how many milliliters of a stock solution of 6.0 m hno3 would you have to use to prepare 110 ml of 0.500 m hno3? (b) if you dilute 10.0 ml of the stock solution to a final volume of 0.250 l, what will be the concentration of the diluted solution? 4.75 a medical lab is testing a new anticancer drug on cancer cells
9.17ml is the volume of stock solution used in dilution.
0.24M is the concentration of the diluted solution.
The dilution formula can be used to solve
c₁v₁=c₂v₂
Here,c₁=concentration of HNO₃ used
v₁=volume of stock solution to be used (unknown)
c₂=concentration of HNO₃ to be prepared
v₂=volume of HNO₃ to be prepared
6.0M x v₁=110ml x 0.500M
v₁= (110ml x 0.500M)/6.0M
v₁= 9.17ml
b)c₁v₁=c₂v₂
c₁=concentration of HNO₃ that is used for diluting
v₁=volume for dilution
c₂=concentration of diluted solution(unknown)
v₂=volume diluted
Putting the values in the formula
6.0M x 10.0ml = c₂ x 250.0ml
=0.24M
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calculate the pH of 10 g dm-3 HCL
The pH of 10 g dm -3 HCL is 3. The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality.
What is pH ?Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
Hydrogen potentials are what PH stands for. It speaks of how many hydrogen ions are present in a solution. This serves as a gauge for the acidity or alkalinity of a solution. On a pH scale, the pH value ranges from 0 to 14.
A solution's pH is a significant indicator of its chemical composition. The pH may affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.
[ H⁺ ] = 10 − 3 M,
pH = − log [ 10 − 3 ],
pH = 3.
Thus, The pH of 10 g dm -3 HCL is 3.
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a bomb calorimeter cannot measure the enthalpy of a reaction directly because it operates at constant:
A bomb calorimeter cannot measure the enthalpy of a reaction directly because it operates at constant volume.
The enthalpy changes that accompany combustion reactions are therefore measured using a regular-quantity calorimeter, including the bomb calorimeter is a tool used to degree energy modifications in chemical techniques.
Consistent volume Calorimetry, additionally recognize as bomb calorimetry, is used to measure the heat of a response even as retaining quantity steady and resisting huge amounts of pressure.
The amount of heat transferred inside the method (q) may be calculated from the mass, specific heat, and temperature exchange of the solution. Because the calorimeter is at constant pressure, q is same to ΔH for the method. Created by Jay.
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The addition of 3. 15 g of ba(oh)2*8H2O to a solution of 1. 52 g of NH4SCN in 100 g of water in a calorimeter caused the temperature to fall by 3. 1 C. Assuming the specific heat of the solution and products is 4. 20 J/g C, calculate the approximate amount of heat absorbed by the reaction, which can be represented by the following equation:
A solution of 1.52 g of NH4SCN in 100 g of water in a calorimeter decreased in temperature by 3.1 °C when 3.15 g of Ba(OH)28H2O was added. Calculate the approximate amount of heat absorbed by the reaction using the following equation, assuming the specific heat of the solution and products is 4.20 J/g °C:
Ba(OH)2 + 8H2O + 2NH4SCN = 10H2O + Ba(SCN)2(aq), 2NH3(aq), and (l)
What is Absorbed ?A material in one state is transferred into another substance in a different state through the process of absorption in chemistry (e.g., gases being absorbed by a liquid or liquids being absorbed by a solid).
The process of absorption is how the blood takes in the byproducts of digestion so that it can supply the rest of the body. The mucous membrane allows for the passage of the digested materials into the blood or lymph during absorption. The following mechanisms allow for absorption. basic diffusion
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which fossil fuel can be made to burn cleaner and reduce carbon dioxide emissions if it is combined with purified oxygen?
Fossil fuel can be made to burn cleaner and reduce carbon dioxide emissions if it is combined with purified oxygen is coal.
Coal can be made to burn cleaner and reduce the carbon dioxide it it will combine with the purified oxygen. coal is type of fossil fuel. coal is black in color or brownish black. the fossil fuel coal is made up of plant. the plant gets their energy from the sunlight so, it is clear that col is from sun. fossil fuels are non renewable source of energy.
Thus, Fossil fuel can be made to burn cleaner and reduce carbon dioxide emissions if it is combined with purified oxygen is coal.
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When a chlorine atom reacts weith a sodium atom to form an ion, the chlorine atom will
Select one:
a.
gain one electron
b.
gain two electons
c.
lose two electrons
d.
lose one electon
Answer:
a) gain one electron
Explanation:
When the chlorine atom reacts with the sodium atom, it creates NaCl. Sodium would be your cation and chlorine would be your anion. A sodium atom (Na) has a 1+ charge while the chlorine atom (Cl) has a 1- charge. As a result, sodium would lose a valence electron causing chlorine to gain a electron.
A university class has 12 students enrolled, 2 of whom are graduate students.
What is the probability that a randomly chosen student will be a graduate
student?
Write your answer as a fraction or whole number.
P(graduate student)
=
Answer:
Answer 1/6
Explanation:
the ability of sim agar to test for hydrogen sulfide production is based on the addition of which of the following substrates? the ability of sim agar to test for hydrogen sulfide production is based on the addition of which of the following substrates? ferrous sulfate sodium thiosulfate peptone peptones, sodium thiosulfate, and ferrous sulfate submit request answer part b hydrogen sulfide gas has a characteristic odor that is similar to what smell? hydrogen sulfide gas has a characteristic odor that is similar to what smell? rotten eggs garden soil body odor baking bread
The ability of sim agar to test for hydrogen sulfide production is based on the addition of which of the following substrates - Peptones, Sodium Thiosulphate, Ferrous Sulfate.
What is Sim agar ?An example of a multi-test medium is SIM (sulfide, indole, motility) media, which examines multiple aspects of the bacterium's metabolism simultaneously. In this instance, motility, indole synthesis, and hydrogen sulfide generation.
Motility, indole, and sulfur. This media is differential. It examines an organism's capacity to reduce sulfur, make indole, and move through the agar (be motile). SIM is frequently used to distinguish between Enterobacteriaceae species.
Pancreatic digest of casein, peptic digest of animal tissue, ferrous ammonium sulfate Fe(NH4)2(SO4), sodium thiosulfate Na2S2O3, agar (3.5 g/L), and distilled water are all ingredients in SIM Medium.
The colorless gas hydrogen sulfide (H2S) has a pungent smell of rotting eggs. The eyes and respiratory system may get irritated after being exposed to hydrogen sulfide.
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How many moles are equal to 4.0 x 10^25 atoms of tungsten
Explanation:
the answer was already on here
an aqueous solution contains 0.331 m hydrocyanic acid. how many ml of 0.268 m potassium hydroxide would have to be added to 150 ml of this solution in order to prepare a buffer with a ph of 9.230?
564.930995917 ml of potassium hydroxide would have to be added .
What is pH ?
The pH of a food is a direct function of the free hydrogen ions present in that food. Acids in food release free hydrogen ions. Hydrogen ions give acidic foods their characteristic sour taste. Therefore, pH can be defined as a measure of free acid. More specifically, pH is defined as the negative logarithm of hydrogen ion concentration. The pH range is 0 to 14. The pH of pure water is exactly 7, so pH 7 is neutral. Values less than 7 are acidic. Values above 7 are basic or basic.
Foods are generally classified as “acidic foods” (low pH, pH 4.6 or less) or “weakly acidic foods” (high pH, pH 4.6 or higher). Safe food storage is determined by the pH of the food. Acidic foods such as fruit and pickles can be safely canned in a tin can with a hot water bath. A combination of acid and hot water (212°F) destroys perishable organisms such as mold and yeast. Proper cooking water canning processes are important to prevent the growth of acid-tolerant molds and yeasts that can lead to elevated pH levels. The pH of borderline foods such as figs and tomatoes can easily exceed 4.6, so lemon juice or citric acid should be added before canning with boiling water. Low-acid foods such as vegetables and meat should be processed in a pressure preserver for safety.
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In each case, she fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 135.0 °C and constant total pressure. Then, she measures the reaction enthalpy AH and reaction entropy AS of the first reaction, and the reaction enthalpy AH and reaction free energy AG of the second reaction. The results of her measurements are shown in the table. Complete the table. That is, calculate AG for the first reaction and AS for the second. (Round your answer to zero decimal places.) Then, decide whether, under the conditions the engineer has set up, the reaction is spontaneous, the reverse reaction is spontaneous, or neither forward nor reverse reaction is spontaneous because the system is at equilibrium. AH = -107. kJ AS = -194 J K X $ ? AG = kJ C(s) + 2C1, (g) - CC1,(g) Which is spontaneous? this reaction the reverse reaction neither AH = 951. kJ | as=0 AG = 37. kJ Al 0,(s) + 3H2(g) + 2Al(s) + 3H20 (8) Which is spontaneous? this reaction the reverse reaction neither
To understand the connection between free energy and the equilibrium constant. The sign of a chemical reaction's standard free energy change G° determines whether the reaction will tend to proceed forward or backward. Similarly, the relative signs of G° and S° determine whether or not temperature affects the spontaneity of a chemical reaction, and if so, how much.
How do you determine enthalpy and entropy?G is only relevant for changes where the temperature and pressure remain constant. Most laboratory reactions are performed under these conditions; the system is usually open to the atmosphere (constant pressure), and the process begins and ends at room temperature (after any heat we have added or which is liberated by the reaction has dissipated.)
The Gibbs function is crucial because it is the single master variable that determines whether a given chemical change is thermodynamically possible.
Thus, if the free energy of the reactants is greater than the free energy of the products, the entropy of the world will increase when the reaction occurs as written, and the reaction will tend to occur spontaneously. In contrast, if the free energy of the products exceeds that of the reactants, the reaction will tend to proceed in the opposite direction rather than the one specified.
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:
A. What is Newton's First Law of Motion?
B. Do objects move by themselves? Why or why not?
Answer:
A:
Newton's First Law of Motion is the law of inertia. It states that an object at rest will remain at rest, and an object in motion will remain in motion, unless acted upon by an unbalanced force.
B:
No, objects do not move by themselves. They require a force to move them.
Explanation:
4. How is a straight average different from a weighted average?
When calculating the straight average or arithmetic average, all numbers are treated equally and are weighted equally. Weighted averaging, however, assigns a weight that predetermines the relative importance of each data point. Weighted averages are most often calculated to even out the frequency of values in a data set.
What are straight average and weighted average ?
The straight average is calculated by adding the earned totals and dividing by the possible totals using points or percentages for the current grading period assignment. The weighted average assigns an importance (or weight) to each number. Weighted averages are more useful than regular averages because they provide more nuance. Less important data are given less weight, so more important data have more impact on results
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which of the following minerals participates in antioxidant reactions? multiple choice question. phosphorus potassium calcium selenium
According to the given statement potassium minerals participates in antioxidant reactions.
What role do antioxidants play in redox reactions?Redox control of signaling pathways is important in defining the expression of genes and cells in response to peroxidation because natural antioxidants play a vital role in lowering ROS/RNS levels.
How do antioxidants inhibit oxidation?By neutralizing free radicals, complexing prooxidative ions, quenching molecular oxygen and phototherapy, and inactivating lipoxygenase, antioxidants prevent food from oxidizing. An antioxidant is a substance that has the power to prevent another molecule from oxidizing; in other words, an antioxidant is a limiting reagent stable enough to give an atom to a free radical in motion, neutralizing it.
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PLEASE ANSWER FAST
In an ionic bond between 2 sodium atoms and an oxygen atom, what resulting charge would each atom have?
Answer:
Explanation:
Ionic bonds form between two or more atoms by the transfer of one or more electrons between atoms. Electron transfer produces negative ions called anions and positive ions called cations. These ions attract each other.
Explanation: An ionic bond is formed because sodium is a part of the Alkali metals and Oxygen is a non-metal and a gas. 4Na + O2 → 2Na2O (s) OR Na + O2 → NaO2 (s).
Answer:
Explanation:
Ionic bonds form between two or more atoms by the transfer of one or more electrons between atoms. Electron transfer produces negative ions called anions and positive ions called cations. These ions attract each other.
What is the density if the mass is 25 grams and the volume is 100 cm cubed?
A. 4 g/cm^3
B. 25 g/cm^3
C. .25 g/cm^3
D. .4 g/cm^3
Answer:
C. .25 g/cm^3
Explanation:
density = mass ÷ volume
25÷100
0.25
reactions that generate products enriched in one enantiomer are said to be . multiple choice question.
Enantioselective are reactions that generate products that are enriched in one enantiomer.
What are enantiomers?Enantiomers are pairs of molecules that exist in two forms that are mirror images of each other but are not superimposable. The enantiomers are chemically identical in all other respects. Enantiomeric pairs are distinguished by the direction in which they rotate polarized light when dissolved in solution, either dextrorotatory (d or +) or levorotatory (l or -). Hence the term optical isomer.
The enantioselectivity of a chromatography system is defined as the preferential interaction of one enantiomer with a chiral selector. It is usually determined as the ratio of the retention factors of the two enantiomers in a chiral chromatography or electrophoresis system.
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if the half life of radium-223 is 12 days, how long will it take for 100 atoms of radium-223 to decay with only 25 atoms of radium-223 left?
It will take 24 days for 100 atoms of radium-223 to decay with only 25 atoms of radium-223 left
What is half life?Half-life is the time required for a quantity to a radioactive substance reduce to half of its initial value. The term is often used in nuclear physics to describe how quickly an unstable atom radioactively decays or how long a stable atom survives. The term can also be used to characterize any type of exponential decay.
Given,
Half life of radium-223 = 12 days
If 100 atoms decay leaving 25 this means = 3/4 decay
Aₓ = A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
Where, Aₓ = the amount left after t years
A₀ = the initial quantity of the substance that has to be decayed
[tex]t_{1/2}[/tex] = the half-life of the decay
So, for 3/4 decay:
A₀ × 1/4 = A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
1/4 = [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
[tex](\frac{1}{2} )^{2}[/tex] = [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
[tex]\frac{t}{t_{1/2} }[/tex] = 2
Since, Half life of radium-223 = 12 days
then,
t/12 = 2
t = 12 × 2
t = 24 days
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Write the formulas of the following binary molecular compounds:
9) nitrogen monoxide
10) diphosphorous pentaoxide
11) chlorine dioxide
12) dinitrogen tetroxide
What is the frequency of a wave whose wavelength is 5.67 x 10^-7
Why would a thermometer be considered a speedometer for atoms? Explain with at least 2 sentences.
Apply to a gas molecule's kinetic energy is not the same as telling you the speed, so calling a thermometer a speedometer for atoms is deceptive.
Why would a thermometer be considered a speedometer for atoms?Uniformly, if a sample of water is put down in the freezer, its molecules begin to move slower (with a lower speed) and this is thought the back by a lower thermometer reading. It is in this feeling that a thermometer can be thought of as a speedometer. As John Rennie broaches in the comments, thermometers work for solids, liquids, and gasses, whereas the temperature is comparable to the average. A thermometer would be an average speedometer for the primary molecules of a substance or structure, not specifically separate atoms.
So we can conclude that thermometers compute the average velocity of atoms in a given material or order volume.
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Sodium can combine with element "X" so that
the chemical formula is Na₂X. What element
could element "X" be?
A)Phosphorus
B)Helium
C)Magnesium
D)Sulfur
Sodium can combine with element "X" so that the chemical formula is Na₂X. element "X" be Sulphur and compound is Na₂S - sodium sulfide.
Ionic bond involves the attraction in positive charge , cation and negative charged anion . The charge of amount of atoms balance to become a neutral compound. Sodium is a metal and have tendency to donate electron and become Na⁺ and Sulphur is a non metal and have tendency to accept electron and form S²⁻. The both combine and for a ionic compound. the 2 negative charge of sulfur atom may be neutralize by 2 Na⁺ atom.
2Na⁺ + S²⁻ ------> Na₂S
Thus, Sodium can combine with element "X" so that the chemical formula is Na₂X. element "X" be Sulphur and compound is Na₂S - sodium sulfide.
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What are physical and chemical changes of matter?
Answer:
Physical changes are those in which the shape, size, or state of the matter changes, but the substance is still essentially the same. Chemical changes are those where one or more substances are combined to produce a new substance.
Explanation:
For example, chopping up a carrot or ice melting into water are both physical changes. Chemical changes are those where one or more substances are combined to produce a new substance. At the end of a chemical change, you have a new substance. Burning a piece of paper would be a chemical change, as would baking a cake. Ozone is an invisible gas made of 3 oxygen atoms.
Which of the electron dot structures correctly illustrates diatomic nitrogen with a triple bond?.
The electron dot structure that correctly illustrates diatomic nitrogen with a triple bond is of diatomic nitrogen which is N≡N.
A Lewis Structure is a simplified representation of the valence shell electrons in a molecule. It is used to show the arrangement of the electrons is arranged around atoms in a molecule.
Usually in Lewis Structure, Electrons are represented by dots but in the case of bonds such as given in the given question, they are represented by lines.
Thus the electron dot structures that correctly illustrate diatomic nitrogen with a triple bond is of diatomic nitrogen which is N≡N.
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30.00 ml of a h2so4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 44.45 ml of a 0.1489 m naoh solution. what is the concentration of the h2so4 solution?
The concentration of the H2SO4 solution should be 0.1101 M.
Calculation of the concentration:
Since
Volume of H2SO4 = 30.00 mL = 0.030 L
Volume of NaOH= 44.45 mL = 0.04445 L
Concentration of NaOH= 0.1489 M
Now
The balanced equation is
H2SO4 + 2NaOH → Na2SO4 + 2H2O
Now the concentration of the H2SO4 solution is
b*Ca*Va = a*Cb*Vb
here, b = the coefficient of NaOH = 2
Ca = ?
Va = the volume of H2SO4= 30.0 mL = 0.030 L
a = the coefficient of H2SO4 = 1
Cb = the concentration of NaOH = 0.1489 M
Vb = the volume of NaOH = 44.45 mL = 0.04445 L
Now
2*Ca*0.030 = 1* 0.1489* 0.04445
0.060 * Ca = 0.00661
Ca = 0.1101 M
Hence, The concentration of the H2SO4 solution is 0.1101 M.
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what is the ph of the mixture when 25.00 ml of 0.200 m koh has been added to 25.00 ml of 0.200 m acetic acid?
Using the Henderson equation , pH = pKₐ + log(salt/acid)
pH-value for given mixture is 4.74
When a strong base like potasium hydroxide (KOH ) reacts with weak acid like acetic acid (CH₃COOH) form a salt ( CH₃COOK ) and water . This type of reaction is called Neutralization reaction.
CH₃COOH (aq) + KOH (aq) ------> CH₃COO⁻K⁺ (aq) + H₂O(aq)
Given that
Hen25 ml of potasium hydroxide( KOH) will react with 25ml of acetic acid (CH₃COOH) of both 0.200m give potasium acetate ( Ch₃COO⁻K⁺) 25ml of strength 0.200m. The unreaceted acetic acid will be present there.Number of moles of KOH = 0.200×25 ×10⁻³= 5 × 10⁻³mol
Number of moles of CH₃COO⁻K⁺= 0.200×25×10⁻³ = 5 × 10 ⁻³mol Number of moles of CH₃COOH = 5 × 10⁻³ molNow , using the Henderson-Hasselbalch equation to find the p-H value
p-H = pKa + log ( salt or conjugate base / weak acid ) ------(1)
where Kₐ is dissociation constant
Since, Kₐ value for acetic acid is 3.8×10⁻⁵
=> pKₐ = 4.74
put the values in (1)
p-H = 4.74 + log ( 5/5) = 4.74 + 0 = 4.74
So, p-H value for solution is 4.74 ..
p-H value of substance or solution refered the nature of solution is acidic or basic .
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sicl4 reacts with mg to produce mgcl2 and si (see video for balancing). if 17 g of silicon are required, how many grams of mg are needed?
If 17 grams of silicon are required, then 7.2 grams of Mg are needed to react.
The balanced chemical equation of the reaction of SiCl₄ and Mg is,
SiCl₄ + 2Mg → Si + 2MgCl₂
So, as we can see from the reaction,
2 moles of Mg reacts, it forms one mole of silicon.
We know,
Moles = Mass/molar mass
we can write,
2 moles of Mg = mole of Si
2 x mass/molar mass = mass/molar mass
Molar mass of Si is 28 g/mol.
Molar mass of Mg is 24 g/mol.
The mass of Silicon required is 17 grams.
Putting the values,
2 x mass/24 = 17/28
Mass of Mg required is 7.2 grams.
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Which of these is NOT a neutralisation reaction?
Answer:
Magnesium + hydrochloric acid → magnesium chloride + hydrogen
why? because the product of a neutralization reaction are always a salt and water. This reaction is the only one which does not have water as a product, so it is not neutralization.
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