The atomic number of Potassium(K) is 19
Knowing the number of electrons in the K atom is necessary before we can write the potassium(K) electron configuration.
There are 19 electrons. All 19 electrons will be positioned in orbitals surrounding the nucleus of the potassium(k) atom when the configuration is written.
there are some steps:
The initial two electrons in the configuration for potassium(k) will be in the 1s orbital.The following two electrons for potassium enter the 2s orbital since the 1s orbital can only accommodate two electrons. Then the 2p orbital receive the six electrons. The p orbital has room for up to six electrons. The first Six electrons will be positioned in 2p orbital, while the next two will be positioned in the 3s. As the 3s are currently full, we'll switch to the remaining six electrons to the 3p.Now we change the 4s orbital and add the final electron.To know more about Orbital, click here:
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at ph=0, the net charge on a polypeptide will be negative.
a. true
b. false
False. A polypeptide will have a negative net charge at ph=0.
A polypeptide is what?A peptide is a small, chemically bound chain of amino acids, usually between two and fifty amino acids (called peptide bonds). A polypeptide is a longer (51 or more amino acids) chain of connected amino acids. One or more polypeptides are used to create the proteins that are produced inside of cells.
What role does the polypeptide play?Polypeptides. Proteins are created by joining several amino acids together to form polypeptides. The coupling of two or so more polypeptides results in the formation of proteins, after which they are folded into the appropriate shape.
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A student performs an experiment several times to determine the enthalpy of combustion of naphthalene, an organic compound with the formula C10H8, and collects the following data: −5181. 6kJmol, −5181. 9kJmol, −5183. 5kJmol, −5180. 1kJmol, and −5184. 2kJmol. What is the relative standard deviation (RSD) for this set of data? Give the answer as a positive number
The relative standard deviation (RSD) for this set of data is 9.98.
What is the combustion enthalpy in kJ/mol?The enthalpy change that occurs when 1 mole of a substance burns (combines vigorously with oxygen) under standard state conditions is known as the standard enthalpy of combustion also known as the heat of combustion. The enthalpy of combustion of ethanol, for instance, is 1366.8 kJ/mol.
Total = -5182.6 - 5181.9 - 5183.5 - 5180.1 - 5184.2
Total = -25912.3
number of items = 5
mean = total sum / number of items
mean = -25912.3/5
mean = -5182.46
[tex]x_{i}[/tex] [tex]x_{i}[/tex]-µ ([tex]x_{i}[/tex]-µ)²
-5181.6 0.86 0.7396
-5181.9 0.3 0.09
-5181.5 -0.1 0.01
-5181.1 -0.5 0.25
-5181.2 -0.4 0.16
∑ ([tex]x_{i}[/tex]-µ)² = 1.2496
Standard deviation = √∑ ([tex]x_{i}[/tex]-µ)² /x
Standard deviation = √1.2496/5
Standard deviation = 0.499
Relative standard deviation = S x 100/x
Relative standard deviation = 0.499 ×100/5
Relative standard deviation = 9.98
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if the density of hydrogen is 0.090 g l and its rate of diffusion is 5.93 times that of chlorine, what is the density of chlorine
The density of chlorine will be 3.163 g/L.
The mass of a substance per unit of volume is its density. According to Graham's law, a gas's rate of effusion is inversely proportional to its square root density. When a material's particles are concentrated in a low area, they tend to travel to the place where the concentration is highest. When we use perfume or a scented spray in one area of the room and subsequently can smell it throughout the entire space, that is a simple illustration of this process.
rate1 = H2 = 5.93
rate2 = Cl2 = 1
The molecular weight of H2 = 2.016
The molecular weight of Cl2 = x.
By Graham's Law:
5.93 / 1 = x / 2.016
35.1649 = x / 2.016
x = 70.89 g/mol
Determine gas density by volume
70.89 g / 22.414 L = 3.163 g/L
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A gas occupies 3.00 L at standard temperature. The volume at 350 C is 6.84 L.
True
False
Answer:
TRUE
Explanation:
Standard temperature is 273K and 350°C is 623K.
V/V' = T/T'
3/6.84 = 273/T'
T' = (273×6.84)/3
=> T' = 623K
So it is true.
help help help help help help
Answer:
d) Hypothesis
Explanation:
I think d) Hypothesis is the correct answer for the question.
Hope it helps :)
what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
The two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances are volume and mass.
What is Volume?
Volume is a measure of the amount of three-dimensional space occupied by an object or substance. It is often measured in liters, cubic centimeters, or cubic meters. Volume is used to measure the capacity of a container, the size of an object, or the amount of liquid or gas in a given space. It is also used to determine the mass of an object, as the density (mass per unit volume) is often known.
The two quantities of volume and mass are important for doing dimensional analysis with chemical substances because they help to measure the amount of a substance in different units. Volume is important for measuring the quantity of liquid substances, and mass is important for measuring the quantity of solid substances. Both of these quantities are necessary for accurate and precise measurements of chemical substances, making them essential for dimensional analysis.
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What is the first thing you should do following an accident with a chemical?
Immediately rinse chemicals off with a lot of water.
Different assistance must be used because different chemical accidents might occur in various ways.
Help while inhaling a chemical:To provide the person access to fresh air, remove them from the factory or work location. Make sure your company has a plan in place for what to do if a worker becomes unconscious or is unable to move. If the person has inhaled chemicals, administer oxygen from an oxygen tank.
Help if a Chemical touch your skin:Immediately rinse chemicals off with lots of water for at least 15 minutes. The more quickly and for a longer period of time you start to pour water over the region, the more damage you will limit. Chemicals that catch fire or absorb quickly through the skin must be washed for a longer time, 30 minutes to 1 hour.
Help if chemical is in eye:Right away, rinse the eye or both eyes. Rinse for at least 15 minutes while using a lot of water. If you have an emergency eye wash, activate it while keeping your eyes open with your fingers. If you must use your hands to splash water in your eyes, keep them open while doing so. Seek assistance in keeping them open.
Help if chemical is in mouth:Look for the chemical label or any other relevant information. Typically, the label will provide information on "ingestion" in the first aid section. If the person should vomit up the chemical or not is determined there. It is crucial that you heed that counsel. If the chemical is consumed, the label can include an antidote. Give the remedy if you have it.
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Select the correct answer from each drop-down menu. what are the percent compositions of vanadium and lead? a metallurgist begins with 1,250 grams of vanadinite (pb5(vo4)3cl) and ends up with 135 grams of pure vanadium and 915 grams of pure lead. the percent composition of vanadium in the ore is , and the percent composition of lead is .
The percent composition of vanadium in the ore is 1A: 10.8%, and the percent composition of lead is 2B: 73.2%.
Vanadinite (Pb₅ (VO₄)₃Cl) = 1250 grams
Pure vanadium= 135 grams
Pure lead = 915 grams
Percent composition of vanadium =?
Percent composition of lead =?
The formula to find the percent composition is as follows:
Percent composition =(substance mass in grams/ sample mass in grams) × 100
1: Now solving to find the percent composition of vanadium by putting values in the formula:
Percent composition of vanadium = (vanadium mass/sample mass) × 100
Percent composition of vanadium = (135 g/ 1250 g) × 100
Percent composition of vanadium = 10.8 %
2: Now finding the percent composition of lead by using the same formula:
Percent composition of lead = (lead mass/sample mass) × 100
Percent composition of lead = (915 g / 1,250 g) × 100
Percent composition of lead = 73.2%
"
Complete question:
What are the percent compositions of vanadium and lead?
A metallurgist begins with 1,250 grams of vanadinite (pb5(vo4)3cl) and ends up with 135 grams of pure vanadium and 915 grams of pure lead.
The percent composition of vanadium in the ore is ______ , and the percent composition of lead is ________ .
OPTIONS:
1.
A. 10.8%
B. 14.3%
C. 14.8%
D. 62.4%
2.
A. 55.6%
B. 73.2%
C. 16.0%
D. 23.8%
"
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Answer:
10.8%
73.2%
Explanation:
I just did the test and its right on plato, Have a great a day!
Which type (or types) of crystalline solid is characterized by each of the following: (a) high mobility of electrons throughout the solid; (b) softness, relatively low melting point; (c) high melting point and poor electrical conductivity; (d) network of covalent bonds?
Types of crystalline solids characterized by;
(a) high mobility of electrons throughout the solid; metallic solids.
(b) softness, relatively low melting point; covalent network solid.
(c) high melting point and poor electrical conductivity; ionic solids.
(d) network of covalent bonds; molecular solids.
What are the types of crystalline solids?Crystalline solids are those that have their atoms, ions, or molecules arranged in a regular, well-defined pattern. The unit cell is the smallest repeating pattern of crystalline solids, and unit cells are similar to bricks in a wall in that they are all identical and repeating.
Ionic solids, molecular solids, network covalent solids, and metallic solids are the four types of crystalline solids. A covalent network solid is a type of solid that has a low melting point, softness, and low electrical conduction. Metal cations are surrounded by a "sea" of mobile valence electrons in metallic crystals.
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Describe an adaptation to a plant's life cycle and explain how this adaptation helps the plant survive.
alright, sum leaves have large air pockets inside that allow the plant to absorb oxygen from the water from rain or puddles
Answer:
Plant adaptations are modifications that enable a plant species thrive in its natural habitat. Underwater aquatic plants have enormous air pockets in their leaves that allow them to collect oxygen from the water. Aquatic plants' leaves are also incredibly delicate, allowing them to move with the waves.
What makes a hypothesis testable?
A. It must be predictable.
O
B. It must be able to be proved right or wrong.
C. It must ask a scientific question.
OD. It must follow the scientific method.
Answer:
B
Explanation:
For a hypothesis to be testable means that it is possible to make observations If a hypothesis cannot be tested by making observations, it is not scientific.
How many moles in 18g of H3PO4?
Answer:
0.184 mol
Explanation:
Look up molar masses for the elements that comprise H₃PO₄:
H = 1.008 g/mol
P = 30.97 g/mol
O = 15.99 g/mol
The molar mass of H₃PO₄ is a weighted sum of these (3 hydrogen + 1 phosphorus + 4 oxygen) that comes out to about 97.99 g/mol.
Then
(18 g H₃PO₄) × (1/97.99 mol/g) ≈ 0.1837 mol
What happens to molecules when they move faster?
When molecules move faster, they increase their kinetic energy.
What is Kinetic energy?
Kinetic energy is essentially the energy of motion. It is the type of energy that an object possesses as a result of its motion. It is commonly defined as the work required to accelerate a given mass body from rest to its stated velocity. Kinetic energy is directly related to the object's mass and the square of its velocity.
This increase in kinetic energy causes the molecules to vibrate more rapidly, resulting in an increase in temperature. As molecules move faster, they also collide with each other more frequently, leading to more chemical reactions.
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How many grams of water will you make from 7 moles of H2?
what happens when stress in rock builds up inside earth
Answer:
Explanation:
Stress causes the build up of strain, which causes the deformation of rocks and the Earth's crust. Compressional stresses cause a rock to shorten. Tensional stresses cause a rock to elongate, or pull apart.
 (Question) How many atoms are in 3 grams of Cu?
(20 points)
3 grams of Cu = 6.022 x 10^23 atoms of copper.
Answer:
2.84 × 10^22 atoms
Explanation:
To calculate the number of atoms in 3 grams of Cu, we can use avogadro's constant where:
[tex]1 \: mole = 6.02 \times 10 {}^{23} \: atoms[/tex]
Firstly, we have to calculate the number of moles in 3 grams of Cu. The formula to calculate moles is:
[tex]moles = \frac{mass}{molar \: mass} [/tex]
the mass = 3g and the molar mass = 63.55 (this value can be found in the periodic table)
Substitute the values in formula:
[tex]moles = \frac{3}{63.55} [/tex]
[tex]moles = 0.0472[/tex]
Now use the number of moles to convert to atoms using avogadro's number, where x is the unknown number of atoms we want to find:
[tex]1 \: mole : 6.02 \times 10 {}^{23} \: atoms[/tex]
[tex]0.0472 \: moles : x \: atoms[/tex]
Cross multiply and equate to solve for x:
[tex]1 \times x = 6.02 \times 10 {}^{23} \times 0.0472[/tex]
[tex]x = 6.02 \times 10 {}^{23} \times 0.0472[/tex]
[tex]x = 2.84 \times 10 {}^{22} \: rounded \: to \: 3sf[/tex]
Hence, there are 2.84 × 10^22 atoms in 3 grams of Cu
If you dilute 125 mL of a 2.5 M solution of Lici to 1.0 L, determine the new
concentration of the solution.
Answer:
0.31M is the new concentration of the solution
Explanation:
The solution is diluted from 125mL to 1.0L = 1000mL. The dilution is of:
1000mL / 125mL = 8 times.
That means the concentration of the diluted solution is 8 times lower than the original solution. That is:
2.5M / 8 times =
0.31M is the new concentration of the solutionIt takes a water wave 5.2 seconds to travel between two docks there are 19 m apart. An observer notices that 20 crests pass the first dock in 17 seconds.
find the wavelength of the water waves.
Answer:
152.12
Explanation:
hope it helps
Kong Mali po sorry
Which molecule is shown below
Answer:
A
Explanation:
You can see the top part looks kinda like methane, and the bottom part looks like hexane.
Answer:
A is correctvia A P E x
Explanation:
Would greatly appreciate the help
9.0 mol Na2S reacts with 8.0 mol
CuSO4 according to the equation below:
Na2S + CuSO4
→
Na2SO4 + CuS
Considering only the 8.0 mol CuSO4,
how many moles of CuS form?
? mol CuS
Round your answer to the tenths place.
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 8.0 mol of CuS form when 8.0 mol CuSO[tex]_4[/tex] reacts.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
Na[tex]_2[/tex]S + CuSO[tex]_4[/tex]→ Na[tex]_2[/tex]SO[tex]4[/tex] + CuS
moles of Na[tex]_2[/tex]S =9.0 mol
moles of CuSO[tex]_4[/tex]=8.0 mol
Since CuSO[tex]_4[/tex] is limiting reagent
moles of CuS=8.0 mol
Therefore, 8.0 mol of CuS form when 8.0 mol CuSO[tex]_4[/tex] reacts.
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What is the smallest measurement you can make on the meter stick using the metric scale?
The smallest measurement you can make on the meter stick using the metric scale is the millimeter.
The millimeter is the smallest measurement on the meter stick . The millimeter is the smallest reading in the meter stick. we use the meter stick to simply measure the length. The meter reading is calibrated in the centimeters in the meter scale. the least count in the meter scale is the millimeters. we can measure the things as the length of the table or the width.
Thus, the smallest measurement in the meter stick using the meter scale is the millimeters. the symbol of the millimeters is mm.
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Estimate how much heat in joules is released when 25. 0 g of water (C = 4. 184 J/g°C) is cooled from 80. 0°C to 30. 0°C?
The heat in joules is released when 25. 0 g of water (C = 4. 184 J/g°C) is cooled from 80. 0°C to 30. 0°C is -5210 J
To find the amount of heat released when a substance is cooled, we can use the equation:
q = mcΔT
where q is the amount of heat (in joules), m is the mass of the substance (in grams), c is the specific heat capacity of the substance (in joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).
Given the information in the question, we have:
m = 25.0 g
c = 4.184 J/g°C
ΔT = 30.0°C - 80.0°C = -50.0°C
So, we can substitute these values into the equation and get:
q = (25.0 g)(4.184 J/g°C)(-50.0°C)
q = -5210 J
Therefore, the amount of heat released when 25.0 g of water is cooled from 80.0°C to 30.0°C is -5210 J.
A negative sign means the heat is absorbed during the cooling process, it is an endothermic process.
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Which types of salts produce SO2 gas on reacting with acids?
Answer:
SO2 and SO3 are acidic oxides that react with bases in aqueous solutions to create sulfurous acid and sulfuric acid salts as these gases dissolve in water. In aqueous solution, SO2 and SO3 react with NaOH to form Na2SO3 and Na2SO4.
Explanation:
Consider the feedback loop that occurs when you je rk your hand away from something hot. How does this reflex help to maintain homeostasis?
Considering the feedback loop that occurs when you quickly remove your hand away from something hot, this reflex helps to maintain homeostasis by ensuring that the body is free from danger and thus maintains the internal condition of the body.
What is homeostasis?The stable internal, external, and chemical conditions that are maintained by living systems are known as homeostasis. In order for the organism to function at its best, a number of factors, including body temperature and fluid balance, must be maintained within predetermined ranges.
The body's reflexes help to maintain homeostasis in the body such as heart rate, breathing rate, blood pressure, and digestion.
Some reflexes that maintain homeostasis in the body include:
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Is this water or oil
Answer:
it is oil.
Explanation:
it is oil because if water was written that would be wried so I think it is oil.
Please help ASAP!!!!!!!!!!!!
1) What properties of a supercritical fluid are more similar to those of a liquid than a gas?
2) What properties of a supercritical fluid are more similar to those of gas than a liquid?
3) Why does CO2 need to be a supercritical fluid for the process of decaffeination?
What mass of HCI is needed to
generate 45.2 g of AICI3?
2AI + 6HCI → 2AICI3 + 3H2
AICI3: 133.33 g/mol
HCI: 36.46 g/mol
[?] g AlCl3
Frida wants to measure the volume of a stone. She starts by pouring 473 mL of water into a large measuring cup. Then she drops in the stone. Now the water measures 499 mL. What is the volume of the stone
Frida wants to find the volume of a stone by measuring the change in water volume before and after the stone is added. the volume of the stone is 26 cm³.
Frida wants to find the volume of a stone by measuring the change in water volume before and after the stone is added. She fills a measuring cup with 473 mL of water and drops the stone in, causing the water level to rise to 499 mL. Using the conversion factor that 1 mL = 1 cm³, the initial volume of water is 473 cm³ and the final volume of water is 499 cm³. By applying the equation [Volume of stone] + [Initial water volume] = [Final water volume],
substituting the values
⇒ xcm3 +473cm3 = 499cm3
xcm3 =499cm3 −473cm3
xcm3 =26cm cube
the volume of the stone can be determined to be 26 cm³.
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Acellus
A steel pipe measures
62. 95 feet. How many
kilometers is this?
? ] km
Be sure to round your answer to the
correct number of significant figures.
Length in km
Enter
The answer is 0.01918 kilometers.
To convert from feet to kilometers,
you must first convert feet to meters. To do this, multiply the number of feet by 0.3048. In this case, 62.95 feet multiplied by 0.3048 equals 19.18 meters To convert from meters to kilometers, multiply the number of meters by 0.001. 19.18 meters multiplied by 0.001 equals 0.01918 kilometers. Therefore, 62.95 feet is equal to 0.01912 kilometers.
To review the conversion steps more closely, starting with feet and ending with kilometers:
1. Feet (62.95) to meters (19.18): Multiply by 0.3048
2. Meters (19.18) to kilometers (0.01918): Multiply by 0.001 or divide by 1000.
Therefore, 62.95 feet is equal to 0.01918 kilometers.
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[sulfate ion] in a1.15 M potassium sulfate
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the concentration of sulfate ion is 1.15 M.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
K₂SO₄[tex]\rightarrow[/tex]2K⁺ + SO₄²⁻
concentration of potassium sulfate=concentration of potassium ion=concentration of sulfate ion
1.15 M =concentration of potassium ion=concentration of sulfate ion
Therefore, the concentration of sulfate ion is 1.15 M.
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