Barium sulfate is a compound used to assist in diagnosing medical problems through x-ray analysis and is 58.8% barium. what mass of barium is present in a 620 mg tablet of barium sulfate?
Final answer:
To find the mass of barium in a 620 mg tablet of barium sulfate, multiply the tablet's mass by the percentage of barium (58.8%). The calculation yields approximately 364.56 mg of barium in the tablet.
Explanation:
The question is asking to calculate the mass of barium present in a 620 mg tablet of barium sulfate, a compound known for its use in medical imaging. Given that barium sulfate is 58.8% barium by mass, we can calculate the mass of barium in the tablet by multiplying the total mass of the tablet by the percentage of barium.
To find the amount of barium, we use the following calculation:
Mass of barium = (mass of barium sulfate tablet) x (percentage of barium) / 100%
Mass of barium = (620 mg) x (58.8%) / 100
Mass of barium = 620 mg x 0.588
Mass of barium ≈ 364.56 mg
Therefore, a 620 mg tablet of barium sulfate contains approximately 364.56 mg of barium.
The temperature at which a liquid turns to a gas is called the boiling point.
If true write true.
If false change the word to make the statement true.
If 2.32 g of ethanol reacts with 10.6 g of oxygen, how many moles of water are produced?
Why do elements that make positive ions occur on the left side of the periodic table while those that make negative ions occur on the right?
Which statement best describes the difference between a physical change and a chemical change?
A. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.
B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
C. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.
D. A chemical change does not result in a new substance being formed, whereas a physical change does.
What is the value of the bond angles in bf3? enter the bond angle of the molecule?
The BF3 molecule forms a trigonal planar configuration because boron, the central atom, is surrounded by three fluorine atoms. As a result, the bond angles in this molecule are exactly 120 degrees.
Explanation:The bond angles in a BF3 molecule, or boron trifluoride, are determined by its molecular structure. This molecule is arranged in a trigonal planar configuration, and hence the bond angles are exactly 120 degrees.
Let's dive a bit deeper - in geometry any three points in a plane can form an equilateral triangle if they are equidistant from each other. Similarly, in BF3 molecule, the boron atom is at the center and the three fluorine atoms are located at the corners of an equilateral triangle.
Since all angles in an equilateral triangle are 60 degrees and the bond angle is the angle between two consecutive sides, it is twice as much, or 120 degrees.
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The bond angles in BF3 are 120°; the molecule's geometry is trigonal planar and highly symmetrical, resulting in a dipole moment of zero. BF3 also tends to bond with a fluoride ion to form BF4-, which is more stable.
Explanation:The value of the bond angles in BF3 is 120°, which corresponds to the molecular geometry known as trigonal planar. Each fluorine atom is positioned at the vertices of an equilateral triangle around the central boron atom, and all bonds are equal in length, and the molecule is highly symmetrical.
Additionally, BF3 has a net dipole moment of zero due to this symmetry. However, BF3 often forms a bond with a fluoride ion, resulting in the formation of BF4−, which completes boron's octet and is more stable.
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how do the characteristics of electron microscopes make them studying cells
The structure of methyl acrylate is shown here. indicate the type of hybridization for each numbered atom.
The structure of methyl acrylate is
Which outcome makes lipids different from other organic compounds? A. They make simple sugars. B. They are made of amino acids. C. They carry information and guard against invasion. D. They don't dissolve in water. \
According to the lewis definition, a base is a(n):
a. proton donor.
b. hydroxide ion donor.
c. hydrogen ion donor.
d. electron pair donor.
e. electron pair acceptor.
Please answer question #1
HNO3 Express your answers as ions separated by a comma.
List at least one reason for not touching the magnesium metal with bare hands. 3. list two reasons for using crucible tongs to handle the crucible and lid after their initial firing in the experimental procedure.
Crucible tongs are mandatory to handle hot crucibles to avoid skin burns and accidents during experimental procedures. Crucible tongs work with the crucible; their shape was designed to firmly hold it to avoid spills.
Touching the magnesium metal can actually contaminate it and bring with it impurities which may not be removed by heating. So this leads to error in weighing.
There are two reasons not to touch the crucible tong with bare hands:
1. The crucible tong is used during firing so it is extremely hot and may burn your hands
2. Any impurities in your hand may contaminate the tong hence leading to error just like the case for the magnesium metal
Refer to the first three rows of the periodic table, what element has properties most similar to carbon?
Describe how you could determine the specific heat of a sample of a solid substance. You may assume that the substance does not react with water. In your answer, make sure to include a description of what equipment you would use and how you would interpret the data you collected.
Answer:
I would use calorimetry to determine the specific heat.
I would measure the mass of a sample of the substance.
I would heat the substance to a known temperature.
I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature. I would wait for the temperature to equilibrate, then calculate temperature change. I would use the temperature change of water to determine the amount of energy absorbed. I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.
Explanation:
Answer on Edg 21'
One year ago, you sold a put option on 100,000 euros with an expiration date of 1 year. you received a premium on the put option of $0.04 per unit. the exercise price was $1.22. assume that 1 year ago the spot rate of the euro was $1.20, the 1-year forward rate exhibited a discount of 2 percent, and the 1-year futures price was the same as the 1-year forward rate. from 1 year ago to today, the euro depreciated against the dollar by 4 percent. today the put option will be exercised (if it is feasible for the buyer to do so).
The molecular formula of a compound is always ________ the empirical formula. the molecular formula of a compound is always ________ the empirical formula. the same as simpler than an integral multiple of more complex than different from
Answer:
A whole number.
Explanation:
Hello,
Empirical formula is the smallest representation of a chemical formula and the molecular formula is the actual formula of a given compound. For instance, glucose has the following molecular formula:
[tex]C_6H_{12}O_6[/tex]
But its empirical formula is:
[tex]CH_2O[/tex]
So they are relation by the 6 as a whole number.
Best regards.
Which radioactive isotope is commonly used to date wooden artifacts?
If the mass of a particular atom is exactly 5 times the mass of an atom of carbon-12, what is its mass
how is a tsunamis form?
A tsunami is a sequence of ocean waves that often originate from the massive volume of water being moved by an underwater earthquake or volcanic eruption.
Undersea disturbance: An underwater earthquake frequently serves as a tsunami's first cause. Strong seismic waves can be produced when tectonic plates in the Earth's crust move or clash.
Displacement of water: The ocean floor frequently moves vertically during an underwater earthquake. A significant volume of water above the bottom is displaced when it rises or falls. This abrupt movement triggers the development of a tsunami.
Tsunami wave generation: Waves propagate outward from the disturbance's epicenter as a result of the water's displacement. These waves have large wavelengths and are initially rather modest, thus they can travel hundreds of kilometres over the ocean.
Wave propagation: The tsunami waves may move quickly, frequently topping hundreds of kilometres per hour, as they spread across the ocean. Yet, they are difficult to spot in the open ocean because to their typically tiny height, which is frequently less than a metre.
Approaching shallow water: The behaviour of tsunami waves alters drastically as they get closer to shallow coastal regions. The waves are slowed down by the shallower water, and the energy that was once dispersed along the wavefront is now concentrated in a smaller area.
Amplification of wave height: The tsunami wave is compressed when it approaches shallow water, raising the height of the wave. The wave may develop into a massive wall of water from a lengthy, almost unnoticeable swell. One of the riskiest characteristics of a tsunami is the abrupt rise in wave height.
Inundation: The tsunami may inflict extensive destruction when it reaches the coast. The wave's strong momentum and substantial water volume have the potential to flood low-lying coastal communities, destroy buildings, and completely destroy anything in its path.
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Show that the speed of an electron in the nth bohr orbit of hydrogen is αc/n, where α is the fine structure constant. what would be the speed in a hydrogen-like atom with a nuclear charge of ze?
Final answer:
The speed of an electron in the nth Bohr orbit of hydrogen is shown to be αc/n by equating the centripetal force to the Coulomb force. This principle extends to hydrogen-like atoms, where the speed becomes Zαc/n for a nucleus with charge Ze.
Explanation:
To demonstrate that the speed of an electron in the nth Bohr orbit of hydrogen is αc/n, where α is the fine structure constant, we start from the principle that the centripetal force required for an electron to move in a circular orbit is provided by the Coulomb force. For a hydrogen-like atom with a nucleus of charge Ze, the centripetal force is given by mev²/rn and the Coulomb force by k(Ze)(e)/rn². By setting these two forces equal, mev²/rn = k(Ze)(e)/rn², we can cancel rn and one charge e to find an expression for v, the electron speed.
To find the speed of an electron in a hydrogen-like atom with nuclear charge Ze, the same process is followed, but with Z = 1 replaced by the actual Z value. Noting that α = ke²/(hc) and rearranging the terms, we determine that the electron speed v = αc/n for a hydrogen atom (Z=1). For a hydrogen-like atom with a nuclear charge of Ze, the speed would be v = Zαc/n.
Name two animals that are omnivores. Give an example of a plant and an animal that each one might eat.
Suppose a lab group reports a percent yield of sand of 105%. Is it really possible to collect more sand than was originally present? What is a possible explanation for the “extra” product? Do not consider calculation mistakes; think about the procedure used.
which statement best describes the properties of ionic compounds????
Under which class of substitution reaction does this reaction appear to fall
This reaction is most likely to fall under SN2 because the thing called carbonication does not occur in SN1. The carbon forms a partial bond with the nucleophile during the intermediate phase and the leaving group. So for this question the reaction will fall under SN2.
Substitution reactions are characterized by the replacement of one or more hydrogen atoms in an alkane with different atoms or groups, without breaking carbon-carbon bonds. These reactions can demonstrate first order behavior and can also be involved in the process of preparing insoluble salts from soluble ones.
The subject of this discussion is a type of chemical reaction known as a substitution reaction. In this type of reaction, one or more of an alkane's hydrogen atoms are replaced by a differing atom or group of atoms, without altering any carbon-carbon bonds. An example of this can be found in the reaction between ethane and molecular chlorine.
The stoichiometry of a homogeneous reaction like this outlines the rates for the consumption of reactants and the formation of products. This process could potentially represent a unimolecular elementary reaction. Interestingly, the rate law derived from this compares to the rate law derived experimentally for the overall reaction, which exhibits first-order behavior.
Substitution reactions can also involve soluble salts to prepare insoluble salts. An example of this is seen with the covalent oxides of the transition elements reacting with hydroxides to form salts containing oxyanions of the transition elements.
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if 4.1 L of gas at 22 degrees celsius is heated to 52 degrees celsius, what would the final volume be?
How many molecules of n2 are in a 300.0 ml container at 780 mmhg and 135°c?
To solve for the number of molecules, we need to first find the number of moles. Assuming ideal gas, we use the formula:
n = PV / RT
where P is pressure = 780 mmHg, V is volume = 300 mL = 0.3 L, T is temperature = 135°C = 408.15 K, R is gas constant = 62.36367 L mmHg / mol K
n = (780 mmHg) (0.3 L) / (62.36367 L mmHg / mol K) (408.15 K)
n = 9.19 x 10^-3 mol
Using Avogadros number, we calculate the number of molecules.
molecules = 9.19 x 10^-3 mol * 6.022 x 10^23 molecules / mol
molecules = 5.54 x 10^21 molecules
[tex]\boxed{{5{.4 \times 1}}{{\text{0}}^{{\text{21}}}}\;{\text{molecules}}}[/tex] of nitrogen are present in a 300 mL container at 780 mm Hg and [tex]135\;^\circ{\text{C}}[/tex].
Further Explanation:
An ideal gas contains a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.
Ideal gas law is considered as the equation of state for any hypothetical gas. Here, we assume nitrogen to be an ideal gas. So the expression for the ideal gas equation of nitrogen is as follows:
[tex]{\text{PV}} = {\text{nRT}}[/tex] ......(1)
Here, P is the pressure of nitrogen.
V is the volume of nitrogen.
T is the absolute temperature of nitrogen.
n is the number of moles of nitrogen.
R is the universal gas constant.
Rearrange equation (1) to calculate the number of moles of nitrogen.
[tex]{\text{n}} = \frac{{{\text{PV}}}}{{{\text{RT}}}}[/tex] ......(2)
Firstly, the temperature is to be converted into K. The conversion factor for this is,
[tex]{\text{0 }}^\circ {\text{C}} = {\text{273 K}}[/tex]
So the temperature of nitrogen is calculated as follows:
[tex]\begin{aligned}{\text{Temperature}}\left( {\text{K}}\right)&=\left({135 + 273} \right)\;{\text{K}}\\&=408\;{\text{K}}\\\end{aligned}[/tex]
Also, the volume is to be converted into L. The conversion factor for this is,
[tex]{\text{1 mL}}={\text{1}}{{\text{0}}^{ - 3}}{\text{ L}}[/tex]
So the volume of nitrogen is calculated as follows:
[tex]\begin{aligned}{\text{Volume}}\left({\text{L}}\right)&=\left({{\text{300 mL}}} \right)\left({\frac{{{{10}^{ - 3}}{\text{L}}}}{{{\text{1 mL}}}}}\right)\\&=0.3\;{\text{L}}\\\end{aligned}[/tex]
The pressure of nitrogen is 780 mm Hg.
The volume of nitrogen is 0.3 L.
The temperature of nitrogen is 408 K.
The universal gas constant is 62.36367 L mmHg/mol K.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{n}}&=\frac{{\left({{\text{780 mm Hg}}}\right)\left({{\text{0}}{\text{.3 L}}} \right)}}{{\left({{\text{62}}{\text{.3637 L mm Hg/K mol}}}\right)\left( {{\text{408 K}}}\right)}}\\&={\text{0}}{\text{.009196 mol}}\\&\approx {\text{0}}{\text{.009 mol}}\\\end{aligned}[/tex]
According to Avogadro law, one mole of any substance contains [tex]{\text{6}}{\text{.022}}\times{\text{1}}{{\text{0}}^{{\text{23}}}}[/tex] molecules.
So the number of molecules of nitrogen is calculated as follows:
[tex]\begin{aligned}\text{Number of molecules of nitrogen}&=\left(0.009\text{ mol}\right)\left(\dfrac{6.022\times 10^{23}\text{molecules}}{1\text{mol}}\right)\\&=5.4198\times 10^{21}\text{ molecules}\\&\bf \approx5.4\times 10^{21}\text{\bf molecules} \end{aligned}[/tex]
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Ideal gas equation
Keywords: ideal gas, pressure, volume, absolute temperature, equation of state, hypothetical, universal gas constant, moles of nitrogen, 780 mm Hg, pressure of nitrogen, 780 mm Hg, volume of nitrogen, 0.3 L, temperature of nitrogen, 408 K, universal gas constant, 62.36367 L mmHg/mol K.
What would be the shape of a molecule with triple bond?
A) bent
B) linear
C) pyramidal
D) tetrahedral
The triple bond is present in hydrocarbons alkyne.The shape of a molecule with triple bond is linear shape. Therefore, option B is correct.
What is triple bond ?The triple bond contain three covalent bond. A covalent bond of bond order is 3, it is consisting of six electrons. Therefore, one pair in a sigma bond and the other pairs in pi bonds present in it.
Alkynes are hydrocarbons in which carbon-carbon triple bonds are present. Their general formula is CnH2n-2 for molecules with one triple bond. Atoms form triple bonds with one another by sharing three pairs of electrons.
Triple-bonded carbons are sp-hybridized, and they have linear shapes. And its bond angle is 180° to each other.
Thus, The shape of a molecule with triple bond is linear shape, option B is correct.
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A ball with a mass of 0.5 kilograms is lifted to a height of 2.0 meters and dropped. It bounces back to a height of 1.8 meters. The energy of the ball has been reduced by joules after bouncing back. This reduction happens because potential energy transforms to energy. Hint: Use PE = m × g × h where g = 9.8 m/s2. NextReset
Potential energy is the stored energy present in an object due to its position. The energy of the ball after reduction will be 0.98 joules due to the conversion of potential energy into kinetic energy.
What are potential and kinetic energy?Potential is the stored amount of energy possessed by an object relevant to its height or position, whereas kinetic energy is due to the motion possessed by the object.
According to the conservational energy, the potential energy will be equivalent to the kinetic energy and is calculated as,
Given,
m = 0.5 kilograms
g = 9.8 m/s²
h = 2.0 - 1.8 = 0.2m
ΔPE = -ΔKE
mgh = -ΔKE
0.5 x 9.8 (1.8 - 2) = -ΔKE
-0.98 J = -ΔKE
Therefore, kinetic energy is 0.98 J.
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What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography column?
Precautions must be considered when introducing a mixture of compounds onto a liquid chromatography column to ensure accurate separation.
Explanation:When introducing a mixture of compounds onto a liquid chromatography column, there are several precautions that must be taken to ensure accurate separation. First, the sample should be introduced as a narrow band at the top of the column. This helps to maintain the initial concentration profile and prevent broadening of the bands. Second, the solvents used in the mobile phase should be compatible with the stationary phase and solutes to avoid any interactions that could affect separation. Finally, the column should be equilibrated with the mobile phase before introducing the sample to ensure consistent separation.