Answer:
1. Heating up a test tube containing reacting Magnesium metal and Hydrochloric acid will increase the reaction rate. This is because heating increases the kinetic energy of the reactant particles, making them move faster and collide more frequently and with greater energy. The increased frequency and energy of collisions will result in a higher rate of successful collisions, leading to a faster reaction.
2. Decreasing the pressure in a syringe containing reacting Sodium chloride and Silver nitrate will not have any significant effect on the reaction rate. This is because the reaction rate is determined by the concentration of the reactants, not the pressure. Lowering the pressure will cause the gases to expand, but it will not affect the concentration of the reactants or the frequency of their collisions. Therefore, the reaction rate will remain unchanged.
Explanation:
The Frackville Power Plant combusts methane to produce electricity. The plant burns 37,500,000 cubic yards of methane each year. The plant produces 61,626,000 kWh of electricity. Calculate the efficiency of this power plant. (Hint: 1 yd3 = 27 ft3)
The efficiency of this power plant that combusts methane to produce electricity is 4.8%.
Given the area of methane = 37,500,000 cubic yards
The power of electricity = 61,626,000 kWh
It is given that the power plant combusts methane to produce electricity.
We know that the efficiency of power is equal to the electricity generated divided by the energy used for combustion.
1 yard^3 = 27ft^3
37,500,000 cubic yards x 27 = 1,012,500,000 cubic feet
Efficiency = energy output/energy input
Efficiency = (61,626,000 kWh) / 1,012,500,000 cubic feet
Here, BTU is the common unit of energy so,
1,012,500,000 cubic feet of methane = 5,072,500,000,000 Joules where 1 Joule = 0.0009478 BTU
5,072,500,000,000 Joules x 0.0009478 = 4,787,039,500,000 BTU
We know that 1 kWh = 3412 BTU then,
61,626,000 kWh = 61,626,000 * 3412 BTU = 210,343,312,000 BTU
efficiency = 210,343,312,000 BTU / 4,787,039,500,000 BTU = 0.0438%
Efficiency = 4.38%
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Calculate the molarity of 0.5 moles NaHCO3 in 1,892 mL of solution.
Answer: 0.264 M
Explanation: the first step is to transfer mL to L, which can be done with the conversion rate of 1000mL = 1L.
This gives you 1.892 L.
Then you divide the mols by the liters, since Molarity (M) =Mol/L.
0.5/1.892 = M
M = 0.2642706131
It can then be rounded to the proper amount of significant figures. I used 3.
M = 0.264
Restate this using moles: “I have 6.02x10 23 baseballs.”
Answer: " I have one mole of baseballs "
Explanation:
A sample of butane gas, C4H10, was collected over water at 28.0 °C and 754.4 torr. The wet gas volume is 1.00 L. What will be the volume of dry butane at 824.1 torr and 55.9 °C?
At 824.1 torr + 55.9°C, dry butane has a of 0.937 L. The basic formula for size is length, breadth, and height, as volume opposed to length, width, and height for the surface of a rectangular shape.
What volume do you refer to?Any three-dimensional solid's volume is the area it takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres. Forms come in a wide range of volumes.
There are three methods for measuring volume.Volumes will be calculated using three different techniques: geometrically (measured lengths); water displace; and pycnometry, to demonstrate the effects of precision on data.
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Suppose 239. 7 mg of PbCl2 was added to 15. 0 mL of water in a flask, and the solution was allowed to reach equilibrium at 20. 0 oC. Some solute remained at the bottom of the flask after equilibrium, and the solution was filtered to collect the remaining PbCl2, which had a mass of 83. 6 mg. What is the solubility of PbCl2 (in g/L)?
The solubility of PbCl2 in water (H2O) at 20.0 °C (temperature) is 10.407 g/L.
First, we need to calculate how much PbCl2 actually dissolved in the water. The amount of PbCl2 that did dissolve is the difference between the initial amount of PbCl2 added and the amount of PbCl2 that remained after filtering:
Initial amount of PbCl2 = 239.7 mg
Amount of PbCl2 remaining after filtering = 83.6 mg
Amount of PbCl2 that dissolved = 239.7 mg - 83.6 mg = 156.1 mg
Next, we can use the density of water at 20.0 °C, which is 0.9982 g/mL, to calculate the volume of the solution:
Volume of solution = 15.0 mL = 0.015 L
Finally, we can calculate the solubility of PbCl2 in g/L:
Solubility of PbCl2 = amount of PbCl2 that dissolved / volume of solution
Solubility of PbCl2 = 156.1 mg / 0.015 L
Solubility of PbCl2 = 10406.7 mg/L
Solubility of PbCl2 = 10.407 g/L
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Calculate the mass of oxygen gas formed when 10g of potassium trioxocarbonate (vi) is heated strongly. (K= 39, O=16, N=14)
One mole of potassium carbonate decompose to give one mole or 32 g of oxygen. Hence, 10 g of potassium carbonate will give 2.31 g of oxygen gas.
What is decomposition reaction?Decomposition is type of reaction in which the one compound breaks into its constituent elements and compounds. Potassium carbonate is an ionic compound which can decomposed on heating to given CO and oxygen gas as follows:
[tex]\rm K_{2}CO_{3} \rightarrow 2 K + O_{2} + CO[/tex]
As per this balanced chemical equation of the decomposition, one mole of potassium carbonate produces one mole of oxygen gas.
molar mass of potassium carbonate = 138 g/mol
molecular mass of O₂ = 32 g/mol
Hence, 138 g of potassium carbonate gives 32 g of oxygen gas. Then, 10 g of potassium carbonate will give
(10 × 32)/138 = 2.31 g.
Therefore, the mass of oxygen formed from 10 g of potassium carbonate will be 2.31 g.
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How many liters of O2 will be produced at a temperature of 12.43 degrees Celsius and 941.34 kPa if 37.25 grams of KCIO, decompose according to the following balanced equation:
2KCIO3
---> 2KCI + 30,(g)
Round your answer to three decimal places.
To solve this problem, we first need to use stoichiometry to determine the number of moles of O2 produced by the decomposition of 37.25 grams of KCIO3.
From the balanced equation, we know that 2 moles of KCIO3 decompose to produce 3 moles of O2. Therefore, we can use the molar mass of KCIO3 to convert 37.25 grams to moles:
37.25 g KCIO3 x (1 mol KCIO3/ 122.55 g KCIO3) = 0.3032 mol KCIO3
Using the stoichiometry of the balanced equation, we can convert the moles of KCIO3 to moles of O2:
0.3032 mol KCIO3 x (3 mol O2/ 2 mol KCIO3) = 0.4548 mol O2
Now that we know the number of moles of O2 produced, we can use the ideal gas law to calculate the volume of gas produced at the given temperature and pressure.
V = nRT/P
Where:
V = volume of gas (in liters)
n = number of moles of gas
R = ideal gas constant (0.0821 L·atm/K·mol)
T = temperature (in Kelvin)
P = pressure (in atm)
First, we need to convert the temperature to Kelvin:
12.43°C + 273.15 = 285.58 K
Now we can substitute the values into the ideal gas law equation:
V = (0.4548 mol)(0.0821 L·atm/K·mol)(285.58 K)/(941.34 kPa/101.325 kPa/atm)
V = 0.0151 L or 15.1 mL (rounded to three decimal places)
Therefore, 37.25 grams of KCIO3 will produce 15.1 mL of O2 at a temperature of 12.43°C and 941.34 kPa.
How are global winds produced?
a) When low pressure equatorial air moves to replace sinking high pressure polar air.
b) When high pressure equatorial air moves to replace sinking low pressure polar air.
c) When high pressure polar air moves to replace rising low pressure equatorial air.
d) When low pressure polar air moves to replace rising high pressure equatorial air.
Global winds are produced when high pressure polar air moves to replace rising low pressure equatorial air.
What do you mean by global wind?
Large-scale atmospheric circulation patterns that cover the entire planet are referred to as global winds. The uneven heating of the Earth's surface by the sun, which results in temperature differences and pressure gradients, is what causes these winds. Ocean currents are influenced by global winds, which also move heat and moisture throughout the planet and affect weather and climate patterns.
The trade winds, the dominant westerlies, and the polar easterlies are the three main wind belts that make up the global wind system. In the tropics, the predominant westerlies move from west to east, but in the mid-latitudes, the trade winds move from east to west. Near the poles, polar easterlies wind from east to west.
The correct option is:
c) When high pressure polar air moves to replace rising low pressure equatorial air.
The uneven heating of the Earth's surface by the sun, which results in temperature disparities and pressure gradients, is what causes global winds. Low pressure occurs close to the equator and high pressure occurs close to the poles as a result of warm air rising at the equator and cold air sinking at the poles.
Global winds are caused by air flowing from high-pressure to low-pressure regions. In this instance, the global wind system is created when high pressure polar air travels towards the equator to replace rising low pressure equatorial air.
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What type of chemical reaction is ammonia + oxygen -> nitric acid + water?
The type of chemical reaction of ammonia + oxygen -> nitric acid + water is a combustion reaction.
What is the chemical reaction?The chemical reaction between ammonia (NH₃) and oxygen (O₂) to form nitric acid (HNO₃) and water (H₂O) is an oxidation-reduction reaction, specifically a combustion reaction.
The balanced chemical equation for this reaction is:
4NH₃ + 5O₂ → 4NO + 6H₂O
followed by the oxidation of NO to form NO₂ and then the formation of nitric acid by the reaction of NO₂ with water:
2NO + O₂ → 2NO₂
3NO₂ + H₂O → 2HNO₃ + NO
So, while the overall reaction involves oxidation and reduction, the formation of nitric acid involves an acid-base reaction.
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MgCl2 is electrolyzed to produce Mg and Cl2. 1311 g of MgCl2 decomposed, what is the percent yield for this reaction if 96.85 g of magnesium are recovered ?
Explanation:
Refer to pic.............
calculate the mole in 4.5 molecules of carbon dioxide
Explanation:
Refer to pic...........
Balance the following reaction. Choose “blank” if no coefficient is needed.
C^2H^5 + O^2 ➡️CO^2 + H^2O
Answer:
Explanation:
4 C2H5 + 11 O2 --> 6 CO2 + 10 H2O
Two hockey players attempt to move the puck at rest. Each player applies a 10 N force on either side of the puck.
What is the resulting motion of the puck?
The puck will move in the direction of the heaviest player.
The puck will move away from the heaviest player.
The puck will not move because equal forces are acting on it.
The puck will not move due to gravity.
As a result of friction, kinetic energy is converted into thermal energy, which lowers velocity as a byproduct.
Describe a motion example.Motion is a characteristic of moving objects. Our daily lives involve a lot of motion, a phenomenon. For instance, the vehicle you are currently in moves, as does the universe, the planet, the air we breathe, the blood in our veins, and a host of other things.
Motion changes in what ways?The total force acting on an item determines its motion; if that total force is not zero, the object will move in a different direction. More mass means the object is heavier.
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HELP WOTH NUMBER 7 PLEAAASE AM A I TURNING 5 MOLES OF COPPER INTO COPPER II NITRATE? ORRRR……
The mass of copper (ii) nitrate formed is 469 g Cu(NO₃)₂
What moles of copper nitrate are formed?The balanced chemical equation for the reaction between copper and silver is as follows:
Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 AgFrom the equation, the mole ratio of Ag and Cu(NO₃)₂ is 2 : 1
5.0 moles Ag × 1 mole Cu / 2 moles Ag = 2.5 moles Cu
2.5 moles Cu × 1 mole Cu(NO3)2 / 1 mole Cu = 2.5 moles Cu(NO₃)₂
The mass of 2.5 moles Cu(NO₃)₂ = 2.5₂ × 187.56 g/mol
Mass of copper (ii) nitrate = 469 g Cu(NO₃)₂
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What term describes the application of water to farmland from
a source such as a lake or river?
The term that describes the application of water to farmland from a source such as a lake or river is "irrigation."
What is Irrigation?
Irrigation is the process of artificially supplying water to crops or plants to promote their growth and development. It involves the application of water to agricultural land using various techniques, such as sprinklers, drip systems, or flood irrigation. The primary purpose of irrigation is to supplement the natural rainfall that is insufficient or irregular in certain regions, allowing farmers to grow crops in areas that would otherwise be unsuitable for farming. Irrigation systems can be designed to deliver the required amount of water directly to the roots of plants, which can increase crop yields and improve the quality of the produce. However, overuse or mismanagement of irrigation can lead to waterlogging, soil salinization, and other environmental problems.
Irrigation is the artificial application of water to land for the purpose of agricultural production. It is a critical practice in areas where rainfall is insufficient or unreliable, as it provides a reliable source of water for crops to grow. Irrigation systems can vary widely depending on the type of crops being grown, the availability of water, and the topography of the land.
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Which TWO situations would a tuned mass damper be a useful technology?
A
B
C
D
E
F
flood
landslide
high wind
avalanche
earthquake
W
volcanic eruption
Answer: highwinds and earthquake
Explanation:
"What does a tuned mass damper do?
Image result for tuned mass damper
A Tuned Mass Damper (TMD), also called a "harmonic absorber", is a device mounted to a specific location in a structure, so as to reduce the amplitude of vibration to an acceptable level whenever a strong lateral force such as an earthquake or high winds hit"
What happens to the molecular attraction and kinetic energy when gas to changes to liquid?
Answer:
the molecules in a liquid don't move apart.
Explanation:
The molecules of a gas move apart when they collide. The average kinetic energy of the particles in a liquid (or solid) is small enough that the forces of attraction between them is sufficient to hold the particles close together. The molecules in a liquid (or solid) do not move apart.
Answer: When a gas changes to a liquid, the molecules in the gas lose some of their kinetic energy and their molecular attraction increases.
Explanation:
In a gas, the molecules are moving around rapidly and colliding with each other and with the walls of the container. These collisions create pressure, and the average kinetic energy of the molecules is high. However, when the gas cools down, the average kinetic energy of the molecules decreases, and they move around more slowly.
As the gas cools down further, the molecules start to come closer together, and the intermolecular attractive forces become more important. Eventually, the attractive forces between the molecules become strong enough to overcome the kinetic energy of the molecules, and the gas condenses into a liquid.
In a liquid, the molecules are still in motion, but they are much closer together and have much lower average kinetic energy than in a gas. The attractive forces between the molecules are strong enough to keep them close together in a fixed volume, but not so strong that they are unable to move around freely.
A sample of oxygen, O 2 , occupies 32.2 mL at 30 °C and 452 torr. What volume will it occupy at –70 °C and the same pressure?
The volume that the oxygen gas will occupy at 32.2mL and 30°C is 21.57mL.
How to calculate volume?The volume of a gas can be calculated using the combined gas law as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁, V₁ and T₁ = initial pressure, volume, and temperature respectivelyP₂, V₂ and T₂ = final pressure, volume and temperature respectivelyAccording to this question, a sample of oxygen gas occupies 32.2 mL at 30 °C and 452 torr.
452 × 32.2/303 = 452 × V/203
48.03 = 2.226V
V = 21.57mL
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Please help and answer this
According to the observations, work of scientist uses evidence while work of an engineer uses a practical approach.
What are observations?Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.
It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.
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How many grams of phosphorus trichloride will be formed upon a complete reaction of 28.7 g of chloride gas with excess phosphorus.(P4)
According to the stoichiometry of the given chemical equation, 37 grams of phosphorus trichloride will be formed upon a complete reaction of 28.7 g of chloride gas with excess phosphorus.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
426 g chlorine gives 549.32 g PCl₃ thus for 28.7 g chlorine will give 28.7×549.32/426=37 g.
Thus,37 grams of phosphorus trichloride will be formed upon a complete reaction of 28.7 g of chloride gas with excess phosphorus.
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24) Write, balance, and label the equations below.
HCl(aq) + KOH(aq)
iron metal + copper(II) sulfate → iron(II) sulfate + copper metal
potassium bromide → potassium metal + bromine
chlorine gas+ sodium metal → sodium chloride
aluminum sulfate + calcium phosphate →
7
sodium iodide + chlorine gas →
C₂H₁0 + O₂
+
1. HCl(aq) + KOH(aq) --> KCl(aq) + H₂O(l)
2. Fe(s) + CuSO₄(aq) --> FeSO₄(aq) + Cu(aq)
3. KBr --> K + Br
4. Cl₂ + 2Na --> 2NaCl
5. Al₂(SO₄)₃ + Ca₃(PO₄)₂ --> 2AlPO₄ + 3CaSO₄
6. 2NaI + Cl2 --> 2NaCl + I₂
7. 2C₄H₁₀ + 13O₂ --> 10H₂O + 8CO₂
There are 200,000,000,000,000,000,000,000 stars in the universe. How many moles is this? I am starting with the unit _______________ and solving for the unit ________________.
Answer:
it is 6E23 moles
Explanation:
How many moles of magnesium is 1. 25
x 1023 atoms of magnesium?
1.25 x 1023 atoms of magnesium contains 0.28. moles of magnesium.
A mole of any element contains Avogadro's number of that element's atoms. To find the number of moles of magnesium in 1.25 x 1023 atoms of magnesium, simply divide by Avogadro's number:
1.25 x
[tex] {10}^{23} [/tex]
magnesium atoms / 6.022 x
[tex] {10}^{23} [/tex]
atoms/mol = 0.208 moles magnesium
As a result, 1.25 x
[tex] {10}^{23} [/tex]
atoms of magnesium contain 0.208 moles of magnesium.
The number of particles (atoms, molecules, and ions) in one mole of a substance is represented by Avogadro's number, which is a fundamental constant in chemistry. It has a value of about 6.022 x
[tex] {10}^{23} [/tex]
particles per mole. The number was named after Italian scientist Amedeo Avogadro, who first proposed the concept in the early 19th century as a way to explain the relationship between the amount of a substance and its constituent particles.
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A liter of milk has a [H+] of about 2.51 × 10–7. (You may prefer to think of the hydronium ion concentration, [H3O+], as 2.51 × 10–7.) Use the formula for the calculation of pH provided and show each step as you calculate the pH of milk. In order to get full points you must show all the steps you take.
Milk has a pH of roughly 6.60.
What is the formula to determine pH based on the amount of H+?The following equation, pH = log [H+], which refers to the molar hydrogen ion concentration, gives the definition of pH. You'll see that to get pH, we must use the common (base 10) logarithm of the hydrogen ion concentration.
The formula for calculating pH is: pH = -log[H+]
where [H+] is the concentration of hydrogen ions (also known as hydronium ions) in moles per liter.
Given that the [H+] in a liter of milk is about 2.51 × 10–7, we can calculate the pH as follows:
pH = -log(2.51 × 10–7)
pH = -log(2.51) - log(10–7) (using the logarithmic rule that log(ab) = log(a) + log(b))
pH = -0.399 - (-7) (taking the negative logarithm of 2.51)
pH = 6.60
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What is the molarity of a solution of sodium hydroxide if 36.6 mL is neutralized by 12.7 mL of a 0.108 M phosphoric acid?
*Write a balanced equation and use stoichiometry to solve.
*Round your answer to correct sig figs. Do NOT put units on your answer.
Explanation:
Refer to pic............
Please help me with this.
The number of moles of aluminum chloride that forms when 81g of aluminium reacts is 3 moles.
How to calculate stoichiometry?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, aluminium reacts with chlorine to produce aluminum chloride.
Based on the balanced equation, 2 moles of aluminum produces 2 moles of aluminium chloride.
81 g of aluminium is equivalent to 3 moles of aluminum
This means that 3 moles of aluminum chloride will be produced if 3 moles of aluminum reacts.
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Suppose that a 0.10 mL bubble of methane gas formed from decaying organisms on the ocean floor, where the temperature is 279 K and the pressure is 623 atm. Assuming that methane acts like an ideal gas, calculate the volume of the bubble at the ocean surface at 1.0 atm and 293 K. Be sure to use significant digits.
The volume of the methane gas bubble at the ocean surface at 1.0 atm and 293 K is approximately 0.063 mL.
What is an ideal gas?Ideal gas is theoretical gas composed of randomly moving point particles that are not subject to the interparticle interactions.
PV = nRT
P is pressure, V is volume, n is number of moles, R is gas constant, and T is temperature.
V = (nRT) / P
n = PV / RT
P and V are the pressure and volume of bubble at the ocean floor, R is gas constant, and T is temperature of the bubble at the ocean floor.
n = (623 atm) x (0.10 mL) / (0.08206 L atm/mol K x 279 K) = 2.76 x 10^-6 mol
V = (nRT) / P
P is the pressure of the bubble at the ocean surface, which is 1.0 atm, and T is temperature of the bubble at the ocean surface, which is 293 K.
V = (2.76 x 10⁻⁶ mol x 0.08206 L atm/mol K x 293 K) / 1.0 atm = 6.27 x 10⁻⁵ L
V = 6.27 x 10^-5 L x (1000 mL / 1 L) = 6.27 x 10^-2 mL
Therefore, the volume of the methane gas bubble at the ocean surface at 1.0 atm and 293 K is approximately 0.063 mL.
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Use the equation for Boyle’s Law to calculate the following. (2pts)
A piston chamber, like a car engine, is filled with 2.00 L of nitrogen gas at 425kPa. The piston is compressed to a volume of 0.35 L.
What is now the pressure inside of the piston chamber? (Assume no gas leaked out).
According to the question the pressure inside the piston chamber is 2414.29 kPa.
What is pressure?Pressure is a measure of the force applied to a given area. It is usually expressed in terms of force per unit area such as pascals (Pa). Pressure is an important concept in physics and is used to describe a variety of phenomena in many areas of science. Pressure is most commonly used to describe the force applied by a gas or liquid on an object. The greater the pressure, the stronger the force. It can also be used to describe forces that are applied to a surface by a solid object. Pressure can be measured with a variety of instruments such as manometers, barometers, and pressure gauges.
The equation for Boyle's Law is P1V1=P2V2, where P1 is the original pressure, V1 is the original volume, P2 is the new pressure, and V2 is the new volume. Using this equation, we can calculate the new pressure, P2, as follows:
P2 = (P1V1)/V2
P2 = (425kPa * 2.00L) / 0.35L
P2 = 2414.29kPa
Therefore, the pressure inside the piston chamber is 2414.29kPa.
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Calculate the equilibrium constant for the chemical reaction, given the equilibrium concentrations of the reactants and products in the table.
2AB(aq)+4CD(aq)↽−−⇀2AD(aq)+2BD(aq)+4C(aq)
The value of the equilibrium constant is independent of the initial concentration of the reactants. It has a definite value for every reversible reaction at a particular temperature.
What is equilibrium constant?The equilibrium constant can be defined as the ratio of the product of molar concentrations of the products to that of the reactants with each concentration term raised to a power equal to its coefficient in the balanced chemical equation.
The expression of the equilibrium constant is:
Keq = [AD]² [BD]² [C]⁴ / [AB]²[CD]⁴
Thus the expression of the equilibrium constant is determined.
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Identify the substance that each property describes. Only acid only base both acid and base
The substance that each property describes are - feels slippery - only base; tastes sour - only acid; conducts electricity - both acid and base
The three properties listed are common characteristics of acids and bases, but they can be used to identify which substance is an acid, which is a base, or which substance has both acidic and basic properties.
Feels slippery: This is a property of bases. When a substance feels slippery, it means that it is producing hydroxide ions (OH-) in water, which react with the skin to create a slippery sensation. So, a substance that feels slippery is a base.
Tastes sour: This is a property of acids. When a substance tastes sour, it means that it is producing hydrogen ions (H+) in water, which react with taste buds to create a sour taste. So, a substance that tastes sour is an acid.
Conducts electricity: Both acids and bases can conduct electricity, but it depends on whether they are in aqueous solution or molten form. In an aqueous solution, both acids and bases dissociate into ions and can conduct electricity. However, in the molten state, only bases can conduct electricity. Therefore, if a substance can conduct electricity in an aqueous solution or molten state, it can be either an acid or a base or both.
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Correct form of question would be
Identify the substance that each property describes.
only acid
only base
both acid and base
feels slippery
tastes sour
conducts electricity
