Answer: The percent yield is, 93.4%
Explanation:
First we have to calculate the moles of Na.
[tex]\text{Moles of Na}=\frac{\text{Mass of Na}}{\text{Molar mass of Na}}=\frac{41.9g}{23g/mole}=1.82moles[/tex]
Now we have to calculate the moles of [tex]Br_2[/tex]
[tex]{\text{Moles of}Br_2} = \frac{\text{Mass of }Br_2 }{\text{Molar mass of} Br_2} =\frac{30.3g}{160g/mole}=0.189moles[/tex]
[tex]{\text{Moles of } NaBr} = \frac{\text{Mass of } NaBr }{\text{Molar mass of } NaBr} =\frac{36.4g}{103g/mole}=0.353moles[/tex]
The balanced chemical reaction is,
[tex]2Na(s)+Br_2(g)\rightarrow 2NaBr[/tex]
As, 1 mole of bromine react with = 2 moles of Sodium
So, 0.189 moles of bromine react with = [tex]\frac{2}{1}\times 0.189=0.378[/tex] moles of Sodium
Thus bromine is the limiting reagent as it limits the formation of product and Na is the excess reagent.
As, 1 mole of bromine give = 2 moles of Sodium bromide
So, 0.189 moles of bromine give = [tex]\frac{2}{1}\times 0.189=0.378[/tex] moles of Sodium bromide
Now we have to calculate the percent yield of reaction
[tex]\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100=\frac{0.353 mol}{0.378}\times 100=93.4\%[/tex]
Therefore, the percent yield is, 93.4%
What can you infer about the results of numerical models in 1966 for polar caps
made of water ice?
Answer:
that by living near the poles, people might be able to survive on Mars
Explanation:
Which statement Ilustrates the difference between a chemical reaction and a nuclear reaction?
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.
Answer:
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
Explanation:
In nuclear reactions there arises a shift in the nucleus of the atom. This results in the production of a different element altogether. While in chemical reactions the electrons are rearrangement and there is no change in the nucleus.Factors like temperature, pressure, and catalysts do not affect the rate of nuclear reactions while they influence the chemical reactions.The change in the energy is higher in nuclear reactions. It arises out of the destruction of mass.Answer:
A
Explanation:
Edge 2021
an element x atomic number 16 reacts with an element Y atomic number 20 to form a compound
i) position of the elements in the modern periodic table
ii) what type of bond will be formed between them ? give reason
iii) write the chemical formula of the compound
Answer:
Element x has an atomic number of 16, it is sulphur.
Element Y has an atomic number of 20, it is calcium.
i) Sulphur is in Group VI, period 3 in the modern periodic table,
whereas calcium is in Group II, period 4 of the modern periodic table.
ii) Ionic bonds will form between them. This is because metals and non-metals (Cacium and sulphur) usually form ionic compounds where between the ions are held by ionic bonds (which are transferred electrons so that both elements can attain a stable status).
iii) CaS
each Calcium atom can lose 2 electrons to attain 8 outermost shell electrons, while each sulphur atom can gain the 2 electrons to attain 8 outermost shell electrons, where they will most be stable (octet). Hence, the atomic ratio of Ca and S is 1:1.
i) The element with atomic number 16 is sulfur present in group 16 and period 3rd and the element with atomic number 20 is calcium present in group 2 and period 4th.
ii) The ionic bond formed between them.
ii) The chemical formula of the compound will be CaS.
What are ionic compounds?Ionic compounds can be described as crystalline solids formed by closely packed ions of opposite charge. An Ionic compound is generally formed when metal reacts with non-metal.
In ionic compounds, the ions are commonly held together by ionic bonds. The ions are formed by gaining or losing electrons in order to achieve their nearest noble gas configuration.
In a reaction, the metals usually lose electrons to complete their octet while non-metals will gain electrons to complete their octet.
The given element calcium is a metal with a valency of +2 and sulfur is a non metal with a valency of -2. Therefore, they form an ionic compound with the chemical formula CaS.
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A metal strip reacts slowly when placed in a light blue solution, and much faster when placed in a dark blue solution at the same temperature. Using the collision theory, explain this phenomenon.
Answer:
Increase in the color intensity and hence the concentration of the reacting species increases the rate of the reaction according to collision theory
Explanation:
The given parameters are;
Rate of reaction of metal strip in light blue solution lesser than rate of reaction of the metal strip in dark blue solution
Therefore, the color of the solution derives from the concentration of the reacting species involved in the reaction.
The increase in the darkness of the blue solution stems from the increase in the concentration of the reacting species which according to collision theory increases the fraction of the effective collisions, thereby increasing the reaction rate.
What was the plum-pudding atomic model? A. A description of atoms being balls of positive charge with electrons scattered outside B. A description of electrons orbiting the nucleus of the atom C. A description of electrons scattered inside the atom D. A description of negative charges being suspended between balls of positive charge
Answer:
C
Explanation:
plum- pudding atomic model is an atom that had a positively charged medium, or space, with negatively charged electrons inside the medium.
The correct answer is (A) A description of atoms being balls of positive charge with electrons scattered outside.
What is plum pudding atomic model? The plum pudding atomic model was proposed by JJ Thomson.This atomic model had electrons embedded with positive charge.The plums were negatively charged electrons the pudding were the positively-charged protons. Why other options are incorrect?
Option (A) is correct because the atom was a sphere of positive charge with negatively charged electrons scattered around the atom like plums in a pudding.
So , Rest options that are B , C and D are incorrect.
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how many atoms altogether make up one molecule of glucose
Answer:
24 atoms makes altogether a molecule of glucose
why aqueous solution of ethanol does not conduct electricity while an aquoes solution of ethanoic acid conducts electricity
Answer:
Explanation:
because ethanoic acid dissocaites into H+ and actetate ion so there is positive and negative chaeges to carry the electrons while ethanol only got evenly distributed in the water.
2KCIO3 -- 2KCL+3o2 is a balanced equation
a) state what is a balanced equation
b) Give a reason why the above equation is balecand
Answer:
a) Balanced equation:
An equation is called balanced if there are same number and same type of atom on both sides of the equation.
b)Reason:
2KClO3--------2KCl + 3O2
Consider this equation in the reactants there are 2KClO3 and in the product there are 2KCl+3O2 . So reactants =products which is a case of balanced chemical equation .
Explanation:
What is cationic and anionic polymers?
Answer:
Explanation:
Anionic polymerization and cationic polymerization are two types of chain growth polymerization reactions which are used to synthesize various types of polymers. Both these reactions have the same reaction mechanism, but the reaction initiator is different. Anionic polymerization reactions are initiated by an active anionic species, whereas the cationic polymerization reactions are initiated by an active cationic species.
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Which commercial technology commonly uses plasmas?
O a radio
O a race car
O a television a microwave oven
The commercial technology that uses plasmas is C. A television.
What is plasma ?Plasma is a state of matter that is similar to gas, but the atoms are ionized, meaning that they have lost or gained electrons. Plasmas are used in a variety of commercial technologies, including:
Plasma TVs use plasma to create images. The plasma is contained in a thin layer of gas between two glass plates. When an electric field is applied to the plasma, it emits light. The color of the light depends on the type of gas used.
Plasma lamps are used in a variety of lighting applications, including streetlights, headlights, and backlighting for LCD displays.
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write down the position of metals,non metals and metalloids in the modern periodic table
Answer:
the position of metal is in left side non metal in right side and metalloids are on remaining positions.
Answer:
Explanation:
When looking at the periodic table, it's important to consider that all the metals are at the left side of the periodic table (Except for Hydrogen). The right side of the periodic table are all nonmetals. The border between metals and nonmetals are the zig-zag lines you can see which contains metalloids elements (Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium, Polonium, and Astatine all appear to have the zig-zag line).
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Name each of the following binary compounds or ionic compounds with polyatomic ions: 1. LiBr 2. Cal2 3. Al203 4. Mg3N2 5. FeCl2 6. FeCl3 7. Cu3N2 8. Ni2O3 9. Al(SO4)3 10. Ca3(PO4)2 11. Fe(OH)2 12. (NH4)2S 13. Na2O 14. NH3 15. SO42-
Answer:
Explanation:
1. LiBr - Lithium bromide
2. Cal₂ - Calcium iodide
3. Al₂0₃ - Aluminium oxide
4. Mg₃N₂ - Magnesium nitride
5. FeCl₂ Ferrous chloride [ Iron(II) chloride ]
6. FeCl₃ Ferric chloride [ Iron(III) chloride ]
7. Cu₃N₂ Copper nitride
8. Ni₂O₃ Nickel(III) oxide
9. Al(SO4)₃ Aluminium sulphate
10. Ca₃(PO4)₂ Copper phosphate
11. Fe(OH)₂ Iron (II) hydroxide
12. (NH4)₂S Ammonium sulphide
13. Na₂O Sodium oxide
14. NH₃ Ammonia
15. SO₄²⁻ Sulphate ion
What is the name of the Group 17 elements ?
Answer:
Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
The name of the Group 17 elements is called halogens
What is the name of group 17 elements?The group 17 elements are very reactive elements. Members of this group include:
Fluorine (F)Chlorine (Cl)Bromine (Br)Iodine (I)Astatine (At)The group 17 element are known to produce salts as they react with metals. Hence, they are called halogens
The group 17 elements are have 7 valence electrons and they required one electron to attain the stable octet configuration of the noble gas family.
From the above, we can see that the name of group 17 elements is halogens
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How many grams of AuCl2, if the compound has 6.3 x10^23 atoms of Cl?
Answer:
Total mass = 93.21 gram (Approx)
Step-by-step explanation:
Given:
Atoms of Cl = 6.3 × 10²³
Find:
Amount of AuCl₂
Computation:
Molecules of AuCl₂ = 6.3 × 10²³ / 2 = 3.15 × 10²³
1 mol of AuCl₂ = 6.022 × 10²³ molecules
Number of mol = 3.15 × 10²³ / 6.022 × 10²³
Number of mol = 0.523 mol
So,
Molar mass of AuCl₂ = 267.87 g/mol
Total mass = 0.348 mol × 267.87 g/mol
Total mass = 93.21 gram (Approx)
HELP PLEASEE 100 POINTS
The Quiver tree grows in Southern Africa. Which of the following plant adaptations is likely to prevent these trees from dying out due to rising desert temperatures?
O Releasing a black powder onto their trunk to absorb more heat from sunlight
O Shifting their growing range towards the equator
Ability to store water in leafy structures to prevent excess evaporation
O Limiting seed dispersal to nearby locations
PLEASE HELP 100 POINTS !!
Answer:
Shifting their growing range towards the equator
Explanation:
Maybe will be like that
Answer:
Ability to store water in leafy structures to prevent excess evaporation.
Explanation:
The reason why plants die in hot temperature is the excess evaporation of water, so to prevent the excess evaporation of water, the plants get adaptive to store water in their leaves.
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Copper turns a green-brown when it is exposed to oxygen in air. What chemical property of oxygen causes this effect?
A). its reactivity
B). its mass
C). its flammability
D). its volume
Answer:
The answer is option A.
its reactivity
I hope this helps you.
Answer:
A) Reactivity
Explanation:
Reactivity is one of the characteristics of a chemical property. The copper that turned color due to air, has a different chemical composition.
It wouldn't be flammability - even though it is a chemical property, but nothing is burning.
All the other answer choises: mass and volume are physical properties. Basically the PHYSICAL characteristics which doesn't change the composition.
Hope this helps!
General Lab Questions: (8 points) 5. A) What is the main problem with precipitating strontium ions from the town's water using phosphate? Can you think of any reasons that your results might not be accurate?
Answer:
1) high pH is required
2) other ions are precipitated along with the strontium ions
Explanation:
According to the solubility rules all phosphates are insoluble except those of sodium, potassium, and ammonium. This implies that strontium phosphate is insoluble in water. This explains why strontium ions can be precipitated from drinking water supply using phosphate. The main problem with the precipitation of strontium using phosphate is that it usually requires a high pH as the precipitation occurs under very alkaline conditions.
The main reason why the results may not be accurate is that other ions are precipitated along with the strontium such as calcium ions and magnesium ions. This may lead to inaccurate determination of the amount of strontium ions present.
Answer:
Explanation:
The fundamental issue for precipitation of Strontium Phosphate, is that the other metal cations (Calcium, Barium, Iron, and so on.), present in the town water, are likewise encouraged as Phosphate. In this manner, alongside Strontium Phosphate, Phosphates of a few different cations are additionally encouraged. In this way, Strontium Phosphate can't be weighed precisely. This will prompt off base outcomes.
The response will be Exothermic, if the temperature of response increments.
Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule? monosaccharide disaccharide monomer starch
Explanation:
lactose is disaccharide
because it contains 1 monosaccharide galactose +
1 monosaccharide glucose
The correct answer to the question is: disaccharide
Monosaccharides are simple sugar which can not be hydrolysed into simpler or smaller molecules.
Disaccharides are sugars produced by the condensation of two monosaccharides with the elimination of a water molecule.
monosaccharide + monosaccharide <=> Disaccharide + waterA Monomer is a small molecule which can combine with other similar molecules to form a large molecule called polymer. Thus, a monomer of starch is simply a small molecule that combines together to form a polysaccharide called starch. The monomer of starch is glucose.
Glucose and galactose combined to form lactose i.e
Glucose + Galactose => LactoseThe above is simply a demonstration of how disaccharides are produced.
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WILL GIVE BRAINLIEST Which effect is one likely result of a forest fire? a. extinction b. adaptation c. speciation d. forced migration
Answer:
d. forced migration
Explanation:
Certain hazardous occurrences affect living organisms in their natural habitat. One of those occurrences is forest fire. Forest fire or vegetation fire is an uncontrollable break out of fire in a vegetation, affecting the inhabitants of the area.
The occurrence of a forest fire will lead to a forced migration of organisms from their natural habitat. Animals and other mobile organisms will be forced to leave behind their devastating habitat and migrate to a less threatened area in order to survive.
Answer:
D
Explanation:
The guy above is correct but I’m saying this for those who don’t want an explanation
In which situation would hydrogen bonding be present?
A. When hydrogen exists as an ion in solution
B. When hydrogen is attached to C, S, or P
C. When hydrogen is attached to N, F or o
D. When hydrogen atoms bond together to form H2
Answer:
C
Explanation:
hydrogen Bond exists between ammonia, hydrogen flouride and water so the answer is C
Determine the density of a substance that weighs 640 grams and occupies a volume of 1 cube it has 4 cm edge
Explanation:
Density = mass / volume
ρ = 640 g / (4 cm)³
ρ = 10 g/cm³
1. Which of these items wastes sound energy?
-car radio
-alarm clock
-washing machine
-smartphone
Answer:
washing machine
Explanation:
the sound from a washing machine is not beneficial in any way
Production of synthetic fibers helps in the conservation of forests comment
Answer:
Explanation:
Synthetic fibres are made using chemicals. Hence they do not require any forest resources like wood. This helps in saving the trees from cutting down. So the production of synthetic fibers helps in the conservation of forests.
Natural fibres on the other hand require forest products like wood for its manufacture.
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Answer:
yes, they do help in conservating the forest resources.
Explanation: This is because synthetic fibers like rayon, nylon etc are made from petrochemicals which helps to substitute usage of natural resources like cotton etc. and these synthetic fibers are more durable than natural fibers, which adds to their usage and in turn, helps to conserve forest resources.
A group of students conducts an experiment to test the amount of sugar that can be dissolved in water at 50°F, 100°F, and 200°F.
Which suggestion will help increase confidence in the result?
A. Michael suggests timing each addition of sugar
B. Ali suggests using her hand to verify the temperature of the water
C. Joel suggests testing salt along with sugar to see if they dissolve at different speeds
D. Zander suggests that each student complete an experiment individually and compare results
Answer:
A. Michael suggests timing each addition of sugar
Explanation:
The experiment is about amount of sugar dissolved at different temperatures. The suggestion of Michael is best suited to record the timing of each addition of sugar. This will enable to record the timing of sugar added in the water and amount of sugar dissolved at the specified temperature.
What type of compound are carbon tetrachloride and boron trihydride?
Answer:
hydrocarbon
Explanation:
these are called hydrocarbons
HURRY I'M ON A TIMER
A stovetop bumer on medium reaches 95°C. Which other object will receive a flow of heat directly from the burner?
the surrounding air
a burner at the same temperature
a pan heated to 100°C
hotter water inside a pan
Answer:the surrounding air
Explanation:
A burner at the sanem temperature would not receive a flow of heat, a pan heated to 100 degrees will transfer heat to the stovetop, and hotter water inside a pan will not take the heat either because it is hotter. the surrounding air is colder and will take heat from the burner
Answer:
surrounding air
Explanation:
taking test too
Identify the missing numbers below to show the result of dividing the numbers 5.6 x 10^12 / 3.5 x 10^9 = A x 10^B
Answer:
A = 1.6
B = 3
Explanation:
When you are dividing exponents, you subtract them:
10^12 / 10^9 = 12 - 9 = 3
10³ would be the exponent
5.6/3.5 = 1.6
So, 1.6(10³) would be your answer.
why does bromine not react with sulphur?
Answer:
The thermodynamic parameter which is of significance in this case is the 'Reduction Potential' for molecular bromine which is ~ +1.1 v vs N.H.E. In other words, it is a strong oxidizing agent. The bromine will oxidize sulfur compounds in which the valence of sulfur is lower than six to sulfate.
There are many possible reactions. Here is one possible example:
Na2 S2O3 + 4Br2 + 5 H2O = 2NaHSO4 + 8 HBr
Answer:
because bromine doesn't have a reaction channel on Yootube.
Explanation:
Speaks for itself.
What would be the mass of Iron(II) chloride obtained when 450g of Sodium Chloride is added to Iron(II) oxide?
Answer:
FeO(s)+2NaCL(aq)>FeCL2(aq)+Na2O(s)
2 moles of sodium chloride react with 1 mole of iron (II) oxide to give 1 mole of iron (II) chlorine
mole ratio NaCl :FeCl=2:1
mass of FeCl=0.5×450=225g
Explanation:
(
The production of water proceeds according to the following equation.
2H2(g) + O2(g) → 2H2O(g)
Which describes a way to speed up the collisions between hydrogen and oxygen molecule:
Use a less-intense source of heat on the reactants.
Maintain the same temperature of the reactants.
Place the reactants in a smaller container.
Reduce the concentration of the reactants.
Answer:
Place the reactants in a smaller container.
Explanation:
If you were to reduce the source of heat, the hydrogen and oxygen molecules would lose their kinetic energy, resulting in less collisions.
_______________________________________________________
Maintaining the same temperature of the reactants, the speed would neither increase nor decrease as temperature is directly proportional to the kinetic energy of the molecules, which in turn is directly proportional to the number of collisions. However, placing the reactants in a smaller container would result in less volume, and hence the molecules would collide with one another more often!
Hope that helps!
The primary requirement of a reaction to occur is that the reactant particles must collide and interact with each other in some way. Place the reactants in a smaller container which speed up the collisions between hydrogen and oxygen molecule. The correct option is C.
What is collision theory?The collision theory states that the rate of a chemical reaction is proportional to the number of collisions between the reactant molecules. The more often reactant molecules collide, the more often they react with one another and faster will be the reaction rate.
If we reduce the source of heat, the hydrogen and oxygen molecules would lose their kinetic energy, resulting in less collisions. The temperature is directly proportional to the kinetic energy of the molecules, which in turn is directly proportional to the number of collisions.
If we place the reactants in a smaller container it would result in less volume, and hence the molecules would collide with one another more often.
Thus the correct option is C.
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