The balanced redox equations of the reactions are:
[tex]SiO_{3}^{2-} + 3\:H_{2}O + 4\:e^{-} \rightarrow Si + 6\:OH^{-}[/tex][tex]2\:Bi + 6\:OH^{-} \rightarrow 2\:Bi(OH)_{3} + 6\:e^{-}[/tex] [tex]SO_{4}^{2-} + 4\:H^{+} + 2\:e^{-} \rightarrow H_{2}SO_{3} + H_{2}O[/tex][tex]Mn^{2+} + 4\:H_{2}O \rightarrow MnO_{4}^{-} +8\:H^{+} + 5\:e^{-}[/tex]What are balanced redox equations?Balanced redox equations are those in which the atoms and electrons transferred are equal on both sides of the equation.
The balanced redox equations of the reactions are given below:
(3a) Balanced REDUCTION half reaction of the equation under basic conditions:
[tex]SiO_{3}^{2-} + 3\:H_{2}O + 4\:e^{-} \rightarrow Si + 6\:OH^{-}[/tex](3b)Balanced OXIDATION half reaction of the equation under basic conditions:
[tex]2\:Bi + 6\:OH^{-} \rightarrow 2\:Bi(OH)_{3} + 6\:e^{-}[/tex](4a) Balanced REDUCTION half reaction of the equation under acidic conditions:
[tex]SO_{4}^{2-} + 4\:H^{+} + 2\:e^{-} \rightarrow H_{2}SO_{3} + H_{2}O[/tex](4b) Balanced OXIDATION half reaction of the equation under acidic conditions:
[tex]Mn^{2+} + 4\:H_{2}O \rightarrow MnO_{4}^{-} +8\:H^{+} + 5\:e^{-}[/tex]Therefore, the balanced oxidation and reduction half reactions are balanced by adding the numerical coefficients to the reacting species as well hydrogen ions, hydroxide ions, water molecules and electrons to the appropriate side of the reactions.
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If winds blow against a mountain from the south, then on which slope would you find the least precipitation?
The northern slope will have the least precipitation if winds blow against a mountain from the south.
What is Slope?This is referred to as the degree of steepness on a surface such as rocky areas etc.
When wind blows on the southern part of a mountains, it gets stuck which is why the northern slope have the least precipitation.
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Solve for x , where M is molar and s is seconds.
Enter the answer. Include units. Use the exponent key above the answer box to indicate any exponent on your units.
x=(3.7×103M−2s−1)(0.37M)3
Answer:
187.416 M/s
Explanation:
First the units M^-2 s^-1 * M^3 = M/s
now the numbers
3700 * .37^3 = 187.416
What are oil traps?
Answer:
A device in which oil can be trapped, or which makes use of oil to trap something else I think
5 Examples of simple salts
Why are chemical equations balanced?
Answer:
The bonds between atoms in the reactants are rearranged to form new compounds in chemical reactions, but none of the atoms disappear and no new ones are formed. As a consequence, chemical equations must be balanced, meaning that the number and kinds of atoms must be the same on both sides of the reaction arrow.
Explanation:
Explanation:
because of to obey the law of conservation mass
you know the law of conservation mass states that matter is neither created nor destroyed during chemical reaction means the mass of reactants is equal to the mass of product
What is the mass (in ng) of 1.23 moles of nickel?
Answer:
7.22 x 10¹⁰ ng Ni
Explanation:
To find the mass of nickel, you need to (1) convert moles to grams (via atomic mass from the periodic table) and then (2) convert grams to nanograms. These ratios need to be multiplied by each other, starting with the given value. It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to reflect the given value (1.23).
Atomic Mass (Ni): 58.693 g/mol
1 gram = 1 x 10⁹ nanograms
1.23 moles Ni 58.693 g 1 x 10⁹ ng
---------------------- x ---------------------- x --------------------- = 7.22 x 10¹⁰ ng Ni
1 mole 1 g
10. How many grams of CoCl₂ in 0.5 liters would be used to make a 1.0 molar solution? I
a. Predict the outcome if 0.5 liters of water is added to 0.5 liters of 0.70M solution of CuSO4
b. Describe what could happen is there is evaporation in the original 0.5 liters of 0.70M
solution of CuSO4
The weight of CoCl₂ used to make 0.5 ltr 1 Molar solution is 49.5g.
How to Calculate weight of substance ?The weight of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.
However,
the number of moles of CoCl₂ must be calculated using the following formula:
no of moles = 0.5L × 1M
no of moles = 0.5moles
Molar mass of CoCl₂ = 99g/mol
mass of CoCl₂ = 0.5 × 99
mass of CoCl₂ = 49.5g
Hence, the weight of CoCl₂ used to make 0.5 ltr 1 Molar solution is 49.5g.
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pls tell this answers
Answer:
okay
Explanation:
9 . acidic
10. hydrogen
answer the following questions
11. Gold as a precious metal is used widely in making jewelry items. This metal is preferred over others for jewelry pieces for various reasons. One important reason for its popularity is that it does not react with atmospheric moisture and therefore, it does not rust.
12. corrosion is defined as rust it's due to humidity and moisture
13. Sulphur appears much below chlorine in the reactivity table and cannot displace chlorine from dilute HCl.
14. Highly conductive metal
Surpassed only by silver, copper is a highly conductive metal. This means electricity can pass through it with greater ease, making it ideal for use in electrical wires. Companies can use other conductive metals to create electrical wires.
15. Corrosion
Copper metal when exposed to air turns green in color due to corrosion. When the copper vessel is exposed to air in the rainy season, the metal reacts with gases, moisture, and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green color to the surface of the copper meta
16. Silicon
silicon is the backbone of the electronics industry. Because silicon is the reason for the fast development happened in the field of electronics. therefore, silicon is the backbone of electronics.
17. High chemical reactivity
Sodium is stored under kerosene because of its high chemical reactivity with almost all of the other elements (for example oxygen from the air which oxidizes it instantly). Kerosene and mineral oil are the only chemicals that make sodium inert. Usually, when Na reacts with a solvent it liberates hydrogen gas from its composition.
18. Metal oxides are oxides of metals. Nonmetal oxides are oxides of nonmetals. The main difference between metal oxides and nonmetal oxides is that metal oxides are basic compounds whereas nonmetal oxides are acidic compounds.
19. Silver is more likely to tarnish near a petroleum refinery than in a place far away from it because when silver reacts with petroleum or hydrogen sulfide present in it as a pollutant in the air, it starts forming a black coating of silver sulfide.
20. A noble metal is ordinarily regarded as a metallic chemical element that is generally resistant to corrosion and is usually found in nature in its raw form. Gold, platinum, and the other platinum group metals (ruthenium, rhodium, palladium, osmium, iridium) are most often so classified. Silver, copper, and mercury are less often to sometimes included as noble metals although each of these usually occurs in nature combined with sulfur.
What hazard symbol does Pesticides have?
The hazard symbol that pesticides have are skull and cross bones.
What are hazard symbols?Hazard symbols represent those symbols that are used as a warning sign towards materials that are dangerous to health.
Example of symbols used are:
Exploding bomb symbol: used for explosivesFlame symbol: used for flammablesskull with cross bones symbol: used for toxic substances such as pesticides.Therefore, the hazard symbol that pesticides have are skull and cross bones.
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The hazard symbol of pesticides is a picture of the skull and crossbones.
What are pesticides?Pesticides are known as substances that are meant to control or destroy pests. They include herbicide, insecticide, nematicide, avicide, rodenticide, bactericide, insect repellent, etc.
The hazard symbol of pesticides is a picture of the skull and crossbones
Thus, the hazard symbol of pesticides is a picture of the skull and crossbones.
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calculate the molecular weight of carbon dioxide
Answer:
44.01 g/mol
Explanation:
Carbon dioxide is produced when carbon and oxygen are burned.
To totally burn carbon into carbon dioxide, or CO2, we require one mole of oxygen for every gram of carbon by weight.
or alternatively:
You produce 12+216=44 g of carbon dioxide for every 12 g of carbon.
The weight of CO2 in kg may be calculated if the amount of CO2 in litres is known by converting it to moles and multiplying it by 44.
How many possible electrons can be held in the Bohr model n=8 energy level?
Electrons in the Bohr model follow the number of elements in the rows of the periodic table.
2 in the first orbit
8 in the second and third ring
18 in the fourth etc...
The Bohr model is a simplistic means of explaining the placement of the subatomic particles of the elements of the periodic table.
The Bohr model arrangement of electrons follows the same pattern as the periodic table.
2 elements in the first row, and 2 electrons in the first orbit.
8 elements in the second row, and 8 electrons in the second orbit.
8 elements in the third row, and 8 electrons in the third orbit.
The fourth and fifth orbits would therefore hold 18 electrons.
For most chemists, the Bohr model does not work well beyond the third row of the periodic table because the model becomes quite oversized and bulky.
Which regulates the flow of electrical current to the filament of the x-ray tube? a. high-voltage circuit
b. low-voltage circuit
c. high-voltage transformer
d. low-voltage transformer
Question 3:
The force of gravity between a planet and its moon is 371 N. If the planet has a mass of 4 x 1022 kg and the moon has a mass of 5 x 105 kg, what is the distance between their centers?
Answer:
=6×10^7metre
Explanation:
By using formula,
F=GMm/d^2
2
Which of the following notations is the correct noble gas configuration for Sr?
OA. [Ar]4s2
OB. [Ar]5s2
OC. [Kr]4s2
OD. [Kr]5s2
Answer:
D
Explanation:
we use noble gas configuration of Kr because Kr atomic number is nearest to Sr
the atomic number of Kr and Sr
is equal to 36 and 38 based on this we write the electron configuration
1s2 ,2s2 , 2p6 , 3s2 , 3p6 , 4s2 , 3d10 , 4p6 === Kr and 5s2
Answer: D.
Explanation:
[Kr]5s2
How many stereoisomers could exist for the following structure?
4
8
16
32
Answer:
64
Explanation:
ieijkjkjjsjsjsjsjsjskskakskskskskkkdksksjdjdjdjdjdjdjdjdndndndmdndndmdmdndndndjdjdjdjdjdkdkekrk
How many moles of O2 are consumed when 2.10 mol of magnesium burns?
1.05 moles of oxygen gas are consumed in the reaction when 2.10 mol of magnesium burns.
What are moles?A mole is defined as [tex]6.02214076 × 10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
We are given:
Moles of magnesium = 2.10 mol
For the given chemical reaction:
2Mg + O₂ → 2MgO.
By Stoichiometry of the reaction:
2 moles of magnesium react with 1 mole of oxygen gas.
So, 2.10 moles of magnesium will react with = [tex]\frac{1}{2}[/tex] X2.10 =1.05 moles
Hence, 1.05 moles of oxygen gas are consumed in the reaction.
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Write and balance the equation for the combustion of the fatty acid lauric acid, (C12H24O2).
C12H24O2 +17 O2-------->12CO2 + 12H2O
Combustion:-
combustion is a chemical reaction that often involves the presence of oxygen and produces heat and light in the form of flames.
Lauric acid:-Lauric acid has a 12-carbon backbone and is a saturated medium-chain fatty acid. In addition to being a key component of coconut oil and palm kernel oil, lauric acid occurs naturally in a variety of plant and animal fats and oils.
White solid lauric acid has a little bay oil odour to it.
Lauric acid is a cheap, non-toxic, and easy-to-handle substance that is frequently employed in lab studies on melting-point depression. Because lauric acid is a solid at ambient temperature but a liquid at boiling temperatures, it can be used to test different solutes to determine their molecular weights.
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Please and thank you
3.8mL of 0.42 phosphoric acid is required.
Reaction
2H3PO4 + 3CaCL3 → Ca3(PO)4 + 6HCl
moles CaCl2 =0.16 mol/L x0.010 L = 0.0016 mol
moles of H3Po4
= 0.0016mol of CaCl2 x 2 mole of H3PO4/3mole of CaCl2
= 0.00106 mol
V of H3PO4 = 0.0016/0.42 = 0.0038L = 3.8mL
V of H3PO4=3.8mL
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Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O2(g) → 2 MgO(s) How many moles of O2 are consumed when 2.10 mol of magnesium burns?
Answer:
1.05 mols of O2 gas
Explanation:
For this type of problem, it's important to understand what the balanced Chemical equation tells us:
Balanced Chemical equationsLet's look at the balanced chemical equation:
[tex]2Mg(s)+O_2(g)-- > 2MgO(s)[/tex]
This equation two sides of the reaction arrow. On the left are the reactants (things you start with, and that react during the chemical reaction), and on the right side are products (things that are produced during the chemical reaction that you end with).
The numbers in front of each compound tell how many of molecules are involved for a full reaction without anything left over. A "mol" is a large quantity ([tex]6.022*10^{23}[/tex]), in this case, of molecules , since it's unlikely you're only taking a single molecule of each substance (it would be so tiny, you wouldn't even know you were doing the reaction).
So,for every 2 moles of Magnesium used, we'll also need 1 mole of Oxygen, and it will produce 2 moles of Magnesium Oxide.
In a way, during the reaction it's almost like 2 moles of Magnesium is equal to 1 mole of Oxygen and is equal to 2 moles of Magnesium Oxide:
[tex]2 mol Mg(s)=1mol O_2(g)=2molMgO(s)[/tex]
From here, we can build some unit ratios, to convert between the known quantity of moles we have, and find the unknown quantity of moles that are requested.
Finding the right unit ratioWe know that we are looking at 2.10 mol of Magnesium, so we want a unit ratio with moles of Mg on the bottom. We want to find moles of O2, so we want a unit ratio of moles of O2 on top.
The unit ratio we want is the middle part of the equation, divided by the left part of the equation.
[tex]2 mol Mg(s)=1mol O_2(g)\\\frac{2 mol Mg(s)}{2 mol Mg(s)}=\frac{1mol O_2(g)}{2 mol Mg(s)}\\1=\frac{1mol O_2(g)}{2 mol Mg(s)}[/tex]
Since this quantity is 1, it is a unit ratio and can be multiplied to other things to change their units (for this problem).
Finding the answerStarting with what we know, and multiplying by our unit ratio:
[tex]2.10 mol Mg(s)*\frac{1mol O_2(g)}{2 mol Mg(s)}=1.05mol O_2(g)[/tex]
Notice that the units from the first quantity cancel with the units on the bottom of the fraction, leaving only the unit on top of the fraction ... the exact units we wanted!
So, 1.05mols of O2 would be consumed during the reaction if exactly 2.10moles of Magnesium are burned.
Please help SCH3U :)
b
Explanation:
containing of ion electron and protons
HELP! ASAP!
2. What is the role of activation energy in a chemical reaction? Using your understanding of activation energy, explain why a piece of paper sitting in a 70° F room does not ignite/burn/react even though there is plenty of oxygen to go around (the cellulose of paper can react with oxygen to form carbon dioxide and water).
Activation energy is required so reactants can move together, overcome forces of repulsion, and start breaking bonds.
What is activation energy?The minimum amount of energy that is needed to activate atoms or molecules to a condition in which they can undergo a chemical transformation or physical transport.
The activation energy of this chemical reaction is high that it will not start at room temperature. This is why a source of heat is required to start the fire: the “energy barrier” must be overcome before the reaction can proceed further.
In any chemical reaction, existing chemical bonds should be broken before new bonds formation. The breaking of chemical bonds requires an input of energy. In some reactions, the thermal energy at room temperature is enough to break the bonds.
In other cases, the thermal energy at room temperature does NOT give enough energy to break the needed bonds (by facilitating sufficiently energetic molecular collisions) to get the reaction started.
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A 10g of limestone is treated with dilute hydrochloric acid.The liberated gas measured at 27°C and 750mmHg is 18.5dm^3.Find the percentage purity of calcium carbonate.
Your question's data is not correct, it should be 100 grams of limestone instead of 10 grams, You will find the correct solution below according to that.
The percentage purity of calcium carbonate is 82.5%
The balanced chemical equation is
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
Because CO₂ is a gas, you can easily convert it to mole directly
No. of mol of CO₂ = volume dm³ /22.4 dm³
No. of mol of CO₂ = 8.5 dm³ / 22.4 dm³
No. of mol of CO₂ = 0.825 mol
According to equation 1 mole of CO2 is made from 1 mole of CaCO3
So, 0.825 mole of CO2 will be made from 0.825 mole of CaCO3
Mass of CaCO3 = moles of CaCO3 × Molar mass of CaCO3
Mass of CaCO3 = 0.825 × 100 grams
Mass of CaCO3 = 82.5 grams
Percentage purity of CaCO3 = (mass of CaCO3/Total mass of CaCO3) × 100
Percentage purity of CaCO3 = (82.5/100) × 100 %
Percentage purity of CaCO3 = 82.5 %
Thus we can say that as percentage purity is the percentage of mass of pure compound on per unit of total compound, the percentage purity of the calcium carbonate will be 82.5 %
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NH3 is produced by the reaction of 0.450 moles of N2 and 0.600 moles of H2 according to the following equation: 2N2 + 3H2 ⟶ 2NH3. (a) How many moles of NH3 are produced? (b) What is the percent yield if 5.52g of NH3 is produced?
The moles of nitrogen produced is 0.40 moles of ammonia.
The Percent yield of ammonia is 81.2%
What moles of ammonia is produced?The moles of ammonia produced is obtained from the mole ratio of the reaction.
The mole ratio of hydrogen to nitrogen is 3 : 2
Based on the mole ratio, the limiting reactant is hydrogen.
Moles of nitrogen produced = 0.600 * 2/3 = 0.40 moles of ammonia.
mass of ammonia expected = 0.4 * 17 g = 6.8 g
Percent yield = 5.52/6.8 * 100% = 81.2%
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Which of these reactions are acid-base reactions?
Answer:
The fifth answer choice (NH3 + H2O = NH4+ + OH-)
Explanation:
An acid-base reaction occurs when an acid and base combine, and the acid, (which is H2O in this case) "donates" a proton, or an H+ to the base. In this reaction, H2O gave one of its H+ to NH3, to make NH4+ and OH-. NH4+ now has a positive charge because it gained a positive ion, while OH- now has a negative charge because it gained a negative ion.
What is the frequency of the green light emitted by a hydrogen atom with a wavelength of 525 nm?
The frequency of the green light emitted by a hydrogen atom with a wavelength of 525 nm is [tex]5.71[/tex]×[tex]10^{14} s^{-1}[/tex]
What is wavelength?
It is the length between two successive crests or troughs of any wave.What is a frequency?
It is the total number of waves that pass through a fixed point in unit time.Wavelength=525nm
The relation between wavelength and frequency
[tex]v=\frac{c}{lambda}[/tex]
[tex]v=[/tex]frequency
[tex]c=[/tex]speed of light = [tex]3.0[/tex]×[tex]10^{8}[/tex][tex]m/sec[/tex]
λ(lambda)=wavelength
substitute the value in the equation mentioned above
[tex]v=3.0[/tex]×[tex]10^{8}[/tex][tex]/525[/tex]×[tex]10^{-9}[/tex]
[tex]=5.71[/tex]×[tex]10^{14}[/tex][tex]s^{-1}[/tex]
hence, the frequency of the green light emitted by a hydrogen atom with a wavelength of 525 nm is [tex]5.71[/tex]×[tex]10^{14} s^{-1}[/tex]
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draw a diagram to show how you will separate the salt from sugar using the solvent ethanol
Part E
From the observations of the simulation, which strategy was most effective for quickly and efficiently producing ammonia? Why do you think this strategy is most effective?
The production of ammonia will be favored at high pressure and low temperature.
What is an exothermic reaction?The term exothermic reaction has to do with a reaction in which the forward reaction is favored at lower temperatures.
Now looking at the reaction coordinate and the equation of the reaction, we know that the production of ammonia will be favored at high pressure and low temperature.
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balance the chemical
reaction by providing the
correct coefficient
Answer:
2HBr + Ba(OH)2 ____ BaBr2 + 2H2O
The numbers placed in front of formulas to balance equations
A laser emits light at a wavelength of 678 nm. How many photons are required to emit 1 joule of energy?
0.342 x [tex]10^(^1^6^)[/tex]) photons are required to emit 1 joule of energy.
What is a photon?A photon is a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy.
We need to find the number of photons emitted per second.
So we have E = hc ÷ λ
= (6.6 x [tex]10^-(^3^4^)[/tex]x 3 x [tex]10^8[/tex] m/s) ÷ 6.78 x [tex]10^(^-^7^)[/tex]nm
= 2.92 x [tex]10^(^-^1^9^)[/tex]Joules
Now number of photons per second = I / E (I = intensity)
= 1 x [tex]10^(^-^3^)[/tex] joule / sec ÷ 2.92 x [tex]10^(^-^1^9^)[/tex]joule
= 0.342 x[tex]10^(^1^6^)[/tex]
Hence, 0.342 x [tex]10^(^1^6^)[/tex]) photons are required to emit 1 joule of energy.
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Which molecule is polar, based on structure?
A. sulfur dioxide
OB. carbon disulphide
OC. ethylene
O D. carbon tetrachloride
Reset
Answer:
Sulfur dioxide (SO2)
⇒ Why is this the best option?
To determine the polarity of the molecule, there are two requirements. The first one has a variety of terminal atoms, whereas the second has a lone pair on the center atoms. The molecule is polar if one of the requirements is met; else, it is nonpolar. The oxygen atom is a terminal atom because it surrounds the sulfur atom, which is the center element in the SO2 molecule's Lewis structure. In this molecule, there are two terminal oxygen atoms. If we look at the first criterion, we can see that it is not met because it calls for the presence of two separate terminal atoms.
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