20. 0 g of Potassium reacts with water to produce Potassium hydroxide and hydrogen gas.
2 K + 2 H2O —> 2 KOH + H2
How many miles of hydrogen are there?
Answers
When 20.0 g of Potassium reacts with water, 0.256 moles of hydrogen gas are produced.
To determine the moles of hydrogen produced when 20.0 g of potassium reacts with water to form potassium hydroxide and hydrogen gas, follow these steps:
1. Determine the molar mass of potassium (K): The atomic weight of potassium is 39.1 g/mol.
2. Calculate the moles of potassium (K) used: moles = mass / molar mass
moles of K = 20.0 g / 39.1 g/mol ≈ 0.512 moles
3. Use the stoichiometry of the balanced equation to find the moles of hydrogen (H₂) produced: 2 moles K produce 1-mole H₂, so the ratio is 1:0.5.
4. Calculate the moles of H₂ produced: moles of H2 = moles of K * (1 mole H₂ / 2 moles K)
moles of H₂ = 0.512 moles * (1/2) ≈ 0.256 moles
So, when 20.0 g of potassium reacts with water to produce potassium hydroxide and hydrogen gas, there are approximately 0.256 moles of hydrogen.
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Related Questions
write the electron configurations for the elements that are identified only by these numbers
a. 15 b. 12 c. 9 d. 18
Answers
atomic number 15
1S^2,2S^2,2P^6,3S^2,3P^3
atomic number 12
1S^2,2S^2,2P^6,3S^2
atomic number 9
1S^2,2S^2,2P^5
atomic number 18
1S^2,2S^2,2P^6,3S^2,3P^6
Converting units Example: Vesna Vulovic survived the longest fall on record without a parachute when her plane exploded and she fell 6 miles, 551 yards. What is the distance in meters?
Answers
The distance in meters is 10159.874 meters.
Distance is defined as the numerical measurement of how far apart the objects are from each other. In everyday life, when it comes to the mechanism of physics, distance refers to the physical length or estimation.
Distance measures length. For example, the distance of a road is how long the road is.
In the metric system of measurement, the most common units of distance are millimeters, centimeters, meters, and kilometers.
The distance is given with: distance = 6 miles + 551 yards
1 mile = 1609.34 m
1 yard = 0.9144 m
distance = 6 miles + 551 yards
= 6 × 1609.34 + 551 × 0.9144
= 10,159.8744 m
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i would like to prepare 250.0 ml of a 2.00 molar solution of perchloric acid. how many milliliters of 16.6 molar perchloric acid do i need to achieve this? enter your answer in ml, but do not type in the units (just the number).
Answers
We would need approximately 30.12 ml of 16.6 molar perchloric acid to prepare 250.0 ml of a 2.00 molar solution.
To calculate the volume of 16.6 molar perchloric acid needed to prepare a 2.00 molar solution, you can use the formula:
M1.V1=M2.V2
Where:
M1=molarity of the concentrated acid
V1= volume of the concentrated acid
M2 = molarity of the desired solution
V2= volume of the desired solution
Rearranging the formula, we get:
V1=M2.V2/M1
Now, let's substitute the values:
V1=2.00ML×250.0ML/16.6M
Simplifying the expression:
V1=500.0/16.6
Calculating this, we find:
V1≈30.12ml
Therefore, you would need approximately 30.12 ml of 16.6 molar perchloric acid to prepare 250.0 ml of a 2.00 molar solution.
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How does an emerging idea differ from scientific consensus? Which best describes emerging scientific ideas?
Answers
Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.
Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.
They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.
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.Answer the following questions about laboratory situations involving acids, bases, and buffer solutions.
(a) Lactic acid, HC3H5O3, reacts with water to produce an acidic solution. Shown below are the complete Lewis structures of the reactants. In the space provided, complete the equation by drawing the complete Lewis structures of the reaction products.
(b) Choosing from the chemicals and equipment listed below, describe how to prepare 100.00 mL of a 1.00 M aqueous solution of NH4Cl (molar mass 53.3 g molâ€"1). Include specific amounts and equipment where appropriate.
NH4Cl (s) 50 mL buret 100 mL graduated cylinder 100 mL pipet
Distilled water 100 mL beaker 100 mL volumetric flask Balance
Mass of NH4Cl: 100 mL = 5.33 g NH4Cl
(1) Weigh out 5.33 g NH4Cl(s) using the balance. (2) Carefully transfer the solid into a 100 mLvolumetric flask. (3) Add distilled water up to the etched line. (4) Mix.
Answers
The complete Lewis structure of lactic acid is:
H H
| |
H-C-C-OH
| |
H-C-C=O
| |
H OH
When lactic acid reacts with water, one of the OH groups will dissociate and form H+ ions. The complete Lewis structure of the product, H3O+, is:
H
|
H O-H
| ||
H-C-C=O
| |
H OH
(b)
To prepare 100.00 mL of a 1.00 M aqueous solution of NH4Cl, we need to dissolve 5.33 g of NH4Cl in distilled water. Here are the steps:
(1) Use the balance to weigh out 5.33 g of NH4Cl(s).
(2) Carefully transfer the solid into a 100 mL volumetric flask.
(3) Add distilled water up to the etched line.
(4) Mix the solution thoroughly until all the solid is dissolved.
You can use a stirring rod to help dissolve the NH4Cl.
The 50 mL buret, 100 mL graduated cylinder, and 100 mL pipet are not needed for this procedure.
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A solution of NaCl was prepared in the following manner: 0.0842 g of NaCl is massed out on an analytical balance. The solid is transferred to a 25.00 mL volumetric flask. Deionized water is added to the flask such that the bottom of the meniscus is at the line. A 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask using a volumetric pipet and diluted to volume. 6. Calculate the concentration of NaCl in the resulting solution in mg/L NaCl. (answer = 67.4 mg/L) 7. Calculate the concentration of NaCl in the resulting solution using propagation of error through the calculation. Use the manufacturer's tolerance values as the absolute error. The tolerances can be found in Chapter 2 of the Harris text. Assume a Class 1 balance and Class A glassware. Treat the tolerances as random error. (answer = 67.4+0.4 mg/L) 8. Identify 2 possible sources of random (indeterminate) error. Identify 2 possible sourses of systematic (determinate) error.
Answers
Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl
To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7. Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.
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how many neutrons of atomic mass is 31 and atomic number is 12
Answers
\(▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪\)
As we know, Number of protons = Atomic Number
So,
Number of protons = 12And, Atomic mass = Number of protons + Number of Neutrons (N)
therefore ~
31 = 12 + N N = 31 - 12 N = 19Number of Neutrons = 19
Compare and contrast the daughter cells of mitosis and meiosis.
Answers
Answer:
For the most part, in mitosis, diploid cells are partitioned into two new diploid cells, while in meiosis, diploid cells are partitioned into four new haploid cells.The daughter cells produced by mitosis are identical, whereas the daughter cells produced by meiosis are different because crossing over has occurred.
Explanation:
What is the frequency of a wave that has a wavelength of 0.50 m and a speed of 380 m/s?
Answers
Answer: f = 760 Hz
Explanation: speed = frequency · wavelength v = fλ.
frequency f = v/ λ = 380 m/s / 0.50 m = 760 Hz
Jay painted the inner four walls of a box. Then he put an ice block into it such that it did not touch the walls, but he couldn't do the same when he put water in that box. Why?
Answers
Answer:
Liquid takes the shape of container, so it will always touch the walls of the box in which you put it.
Explanation:
We know that a solid has a definite shape and a definite volume hence it occupies only its own volume in the box, it does not touch the walls of the box.
However, a liquid does not have a definite shape and volume. It occupies the volume of the box. Therefore, the liquid water must definitely touch the walls of the box.
CO + Fe2O3 --> 2 Fe + 3 CO2 12. Using the equation in number 11, what is the mole ratio of carbon monoxide reacting to the amount of carbon dioxide being produced? A. 3:1 B: 2:1 C. 3:3 D. 3:2 13.
Answers
In the given reaction, the mole ratio of carbon monoxide reacting to the amount of carbon dioxide being produced is 1:3. So option D is correct.
The balanced chemical equation for the reaction is:
CO + Fe2O3 → 2 Fe + 3 CO2
To determine the mole ratio of carbon monoxide (CO) reacting to the amount of carbon dioxide (CO2) being produced, we compare the coefficients of CO and CO2 in the balanced equation.
From the equation, we see that the coefficient of CO is 1, while the coefficient of CO2 is 3. This means that for every 1 mole of carbon monoxide that reacts, 3 moles of carbon dioxide are produced.
Therefore, the mole ratio of CO to CO2 is 1:3.
This implies that for every 1 mole of CO that reacts, 3 moles of CO2 are formed. It is important to note that the mole ratio is determined from the coefficients in the balanced chemical equation and provides information about the stoichiometry of the reaction. So option D is correct.
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Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 C to 30.0C if
the specific heat of the substance is 2.01 J/gC.
Answers
Answer:
100.5 J
Explanation:
How many Atoms are in 12 NaBr
Answers
Answer:
there are 12 atoms in 12 sodium bromide
According to the concept of Avogadro's number, there are 0.702×10²³ atoms in 12 NaBr.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number, substitution of values in formula gives number of atoms= 12/102.89×6.023×10²³=0.702×10²³.
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Someone pls help me I will make you you brain
Answers
Answer:
I and II
Explanation:
Hope this helps!
Which type of electromagnetic radiation had a lower frequency than infrared radiation
Answers
Answer:
Radio waves
Explanation:
Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation. In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.
A 150 L(≈40gal) electric hot-water tank has a 5.0 kW heater. How many minutes will it take to raise the water temperature from 66.0 F to 149 F ?
Answers
631.60 min will it take to raise the water temperature from 66.0 F to 149 F.
The temperature difference is 83 F degree that is in kelvin 301.484 k.
assume Q is the heat and t is the time so P = Q / t
where P is power
m = ρV
t = ( cm ΔT / P )
= (ρcVΔT / P)
= ( 1000 * 4190 * 0.150 * 301.484 / 5000)
= 631.60 min
Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured with a thermometer.
Thermometers are calibrated in various temperature scales that historically have relied on various reference points and thermometric substances for definition. The most common scales are the Celsius scale with the unit symbol °C (formerly called centigrade), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes. The kelvin is one of the seven base units in the International System of Units (SI).
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Which quantum number represents the main energy level of an electron?
A. n
B. m
c. e
D. /
Answers
Answer:
A
Explanation:
Identify the pair in whic 1 the formula does not match the name
sulfite, SO32
nitrite, NO3-
hydroxide, OB
dichromate, C 20-2
Answers
Answer:
hydroxide is the one because it is the one HAHAH
Answer:
hydroxide, OB
Explanation:
hydroxide,OB
Select the correct answer from each drop-down menu. At chemical equilibrium, the amount of because .
Answers
Answer:
The answer that completes the question are in BOLD:
At chemical equilibrium, the amount of PRODUCT AND REACTANT REMAIN CONSTANT because the RATES OF THE FORWARD AND REVERSE REACTIONS ARE EQUAL.
Explanation:
In a reversible chemical reaction, an equilibrium is said to be achieved when the rates of the forward reaction is equal to that of the reverse reaction. A reversible reaction is one in which products are formed from reactants simultaneously with the formation of reactants from products.
The combination of two or more substances called REACTANTS gives rise to another substance called PRODUCT, which can in turn give rise to Reactants again. With time, the rate at which the reactants give rise the products, which is called the FORWARD REACTION will be equal to the rate at which the products give rise to the reactants, which is called REVERSE REACTION. At this point, the chemical reaction is said to be in a STATE OF EQUILIBRIUM.
When the rate at which both reaction occurs becomes equal i.e. at an equilibrium state, the concentration of both the reactants and the products becomes constant i.e. no longer changes. Hence, the amount of the reactants forming the products is the same as the amount of products forming the reactants.
N.B: At chemical equilibrium, the amount of the reactants and products does not necessarily equals zero (0). It simply means that there is no net change in the concentration/amount of both reactants and products.
The solubility of solids______ when the temperature is increased.
A. increases
B. decreases
C. does not change
Answers
defintion of producer
Answers
Answer:
a producer is an organisms that produce food for themselves and other organisms.
16 A particular light source gives off light waves with a measured wavelength of 2.0 x 10-7 m.
What is the frequency of the light source?
А 6.67 X 10-15 Hz
B 6.0 x 1011 Hz
с 1.5 x 1015 Hz
D Not enough information
Answers
Refer to the attachment
Light waves are part of the electromagnetic spectrum. The frequency of light therefore is 1.5 * 10^15 Hz.
What is light?
Light is an electromagnetic wave and we know that the speed of light is a constant which is 3 * 10^8 m/s.
Knowing this; v = λ * f
λ = wavelength
f= frequency of light
v = seed of light
f = v/λ
f = 3 * 10^8 m/s/2.0 x 10-7 m
f = 1.5 * 10^15 Hz
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Carbon-13 is an isotope. It has 6 protons and _____. 13 neutrons 7 neutrons 7 electrons 13 electrons
Answers
Answer:
7 neutrons
Explanation:
Answer:
7 neutrons
Explanation:
please help fast i need the answer i will mark brainliest
Answers
Answer:
the answer is C.
Explanation:
Answer: I think the answer would be C
Explanation: The answer is C because of the fact that mixtures are 2 or more substances that are combined and they will have several different types of substances and other chemicals in there. Also if you have a mixture well then it probably will have more than just 1 different kind or different types of properties inside of the mixture and inside the substances as well. If you do have a chemical change or chemical reaction then that can indeed separate any or maybe even all of the different molecules and the mixtures as well. Hoped i helped:)
Will give brainliest
process name of liquid bromine to bromine vapor
Answers
Answer:
evaporation, vaporisation, boiling if change occurs at boiling point
Explanation:
Diffusion is the name of process that , happens in liquids and solids ( Atomic diffusion ) as well although in solids it is a very slow process.ln liquids it is quicker, imagine putting a drop of dye into a bowl of clear water, after a while all the water will be colored.
Brown fumes of bromine vapour spread through the whole glass jar because of phenomenon of diffusion in the glass jar.
The gasses gases show the property of moving continuously in the air that's why Brown fumes of bromine vapour spread through the glass jar.
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Express the composition of each compound as the
mass percent of its elements (percent composition).
a.
sucrose (C,H),0.,)
c. magnetite (Fe,O.)
b.
aluminum sulfate
(Al, (SO,).)
Answers
The composition of each compound as the mass percent of its elements is as follows:
For Sucrose - Carbon is 42.18%, Hydrogen is 6.44% and Oxygen is 51.38%.For Aluminum sulfate - Aluminum is 3.99%, Sulfur is 4.57% and Oxygen is 87.44%.For Magnetite - Iron is 71.83% and Oxygen is 28.17%.What is mass percent?Concentration is expressed as mass percent. Additionally, the ingredients in a particular mixture are described. Solution composition can be understood in terms of mass percent. It indicates the mass of solute present in a solution of a given mass. The amount of solute is expressed in mass or moles.
Mass Percent = (Component Mass ÷ Total Mass) x 100% or
(mass of solute ÷ mass of solution) x 100%
a. Sucrose (C₁₂H₂₂O₁₁) with molecular mass of 342.296 u composed of:
Carbon: (12 x 12.01) / 342.296 = 42.18%
Hydrogen: (22 x 1.01) / 342.296 = 6.44%
Oxygen: (11 x 16) / 342.296 = 51.38%
b. Aluminum sulfate (Al₂(SO₄)₃) with molecular mass of 342.14 u is composed of:
Aluminum: (2 x 26.98) / 342.14 = 3.99%
Sulfur: (3 x 32.06) / 342.14 = 4.57%
Oxygen: (18 x 16) / 342.14 = 87.44%
c. Magnetite (Fe₃O₄) with molecular mass of 231.534 u is composed of:
Iron: (3 x 55.85) / 231.534 = 71.83%
Oxygen: (4 x 16) / 231.534 = 28.17%
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Which of the following is correct order from smallest to biggest
Answers
Sorry this question is incomplete.
what is the mass of a powder if the combined mass of the powder and its container is 12 grams and the mass of the container alone id 4 grams?
Answers
The mass of the powder alone can be found to be 8 grams.
How to find the mass ?The mass can be found the process where we will subtract the mass of the container from the combined mass of the container and powder.
The formula is:
Mass of powder = combined mass of container and powder - mass of container alone
Mass of powder = 12 grams - 4 grams
Mass of powder = 12 grams - 4 grams
Mass of powder = 8 grams
In conclusion, the mass of the powder alone without the container is therefore 8 grams.
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The overnight temperature in Polokwane drops from 11° C to -2° C. By how many degrees has the temperature dropped?
Answers
.
A student observes what happens when two different aqueous solutions are mixed in a test tube. Which of the following observations would be most indicative of a precipitation reaction?
Gas bubbles are produced.
There is a color change.
The test tube warms.
A solid settles out.
Answers
Answer:
a solid settles out
Explanation:
a precipitate is when a solid forms