When expose to the chemicals, species are highly susceptible to the poison.
What is concentration?
A substance's concentration is the amount of solute present in a given amount of solution. Molarity is the number of moles of solute in one liter of solution and is used to express concentrations.
The LD50 can be calculated for any route of administration, including dermal and oral contact or ingestion of chemicals. A species with a high LD50 has a high tolerance to the poison. A low LD50 indicates that the species is extremely vulnerable to the poison.
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which characteristic of a substance is considered a chemical property?its boiling pointits reactivityits densityits conductivity
Reactivity is the right response because it is the only research that causes a chemical change.
Definition of densityDensity definition Density is the measurement of how tightly a substance is packed. It has the same definition as the mass per unit volume. Indicator of density: D or Density Formula: The formula is: = m/V and where's the density, m is the organism's mass, & V is its volume.
What different types of density are there?Absolute density & relative density are the two main types of density. The relative density, or specific gravity, of a substance is defined as its density divided by the thicknesses of a reference material. Water is commonly cited as a source of information.
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the mass spectrum of gaseous cl which contains isotopes of mass numbers 35 and 37, consists of singly-charged peaks corresponding to m/e values of
The mass spectrum of gaseous cl which contains isotopes of mass numbers 35 and 37, consists of singly-charged peaks corresponding to m/e values is 78 m/z
A mass spectrum is simply the m/z ratios of the ion present in a sample plotted against their intensities and each peak in a mass spectrum show a component of unique m/z in the sample and height of the peak cannot the relative abundance of the various components in the sample and there are two molecular ion peak in the mass spectra of compound containing a single chlorine atom and this is because chlorine exist as two isotopes ³⁵Cl and ³⁷Cl and the mass spectrum of 2 chloropropane has peak at m/z is 78 due to molecular ion containing an atom of ³⁵Cl
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Which is the best argument for why CO2 represents a covalent bond?
a
The difference in electronegativity of the two elements is greater than 1.7.
b
The difference in electronegativity of the two elements is less than 1.7.
c
The difference in electronegativity of the two elements is greater than 1.7 but less than 3.0.
d
The difference in electronegativity of the two elements is zero.
Answer:
B.) The difference in electronegativity of the two elements is less than 1.7.
Explanation:
A difference of less than 2 between atoms leads to covalent bond formation. Electronegativity is the ability of an atom to draw bonding electrons when it is bonded.
We know that in covalent bonding, atoms "share" elections. We also know that in ionic bonding, atoms "take" electrons. If the electronegativity was too great then atoms would no longer share electrons, one would just draw the electron to it. The ideal values to covalently bond, in this case, would be below two.
after titration, 25 ml of a vinegar solution was found to contain 0.03 moles of acetic acid. using a density of 1.00 g/ml, what is the mass percentage of acetic acid in this vinegar sample? report your answer to three decimal places.
The mass percentage of acetic acid in this vinegar sample is 1.00 %
Density is the size of ways tightly a fabric is packed collectively. it is described as the mass consistent with unit quantity. Density image: D or ρ Density system: ρ = m/V, wherein ρ is the density, m is the mass of the object and V is the quantity of the item.
Density is the substance's mass per unit of volume. The image most usually used for density is ρ, despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by using volume Density is the mass of an object divided by using its extent. Density frequently has gadgets of grams according to cubic centimeters (g/cm3).
Calculation:-
Acetic Acid = 0.03 mol
moles of Gram of Acetic acid=moles x molar mass.
= 0.03 mol x 60 mol
Now, as De 1.8g Density = 1.00
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Write down four different covalent compounds that could form, and indicate why they are
covalent based on the electronegativity differences.
What are the 6 basic crystal structures?
Answer:
Isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic
Explanation:
The 6 basic crystal structures are Isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic.
What are crystal structures?
Crystal structure is a description of the orderly organisation of atoms, ions, or molecules in a crystalline material in crystallography. Ordered structures produce symmetric patterns that repeat in the principal directions of three-dimensional space in matter due to the intrinsic nature of the constituent particles. The structure's unit cell is basically group of nanoparticles in the substance that makes up this repeating pattern. The unit cell completely mirrors the symmetry and structure of the entire crystal, which is constructed by repetitive translation of the unit cell along its primary axes. The nodes of the Bravais lattice are defined by the translation vectors.
The 6 basic crystal structures are Isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic.
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An aquifer receives 20 m³ of precipitation and loses 2 m³ of water through natural movement. If the water budget mus
be balanced, how much water can be pumped from the aquifer?
O 22 m³
O 36 m³
O 18 m³
20 m³
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From the aquifer, 18 m3 of water may be pumped.
What distinctions exist between the water budgets of the local area and the entire planet?Because the total amount of precipitation, evapotranspiration, and runoff are equal, the water budget of the entire planet is balanced. Local water budgets, also known as water use budgets, are typically unbalanced for a certain area.
How does surface water become groundwater and travel below it?The naturally occurring water cycle includes groundwater (check out our interactive water cycle diagram). The precipitation that falls on the ground penetrates the subsoil to some extent. The portion of groundwater recharge that travels deeper into the soil until it reaches saturated rock material is the last to do so.
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Yoko and her friends are learning about energy in class. They see a ball sitting on a table. Yoko and her friends have different ideas about the energy of the ball. This is what they said
Who do you most agree with
Yoko: I think the ball has no energy because it is not moving
.Caleb: I think the ball has no energy because no forces are acting on it
Kawasi: I think the ball has energy but less energy than if it was sitting on the ground because it is farther away from Earth’s surface.
Sonia: I think the ball has more energy than if it was sitting on the ground because it is farther away from Earth’s surface
I think the ball has energy but less energy than if it was sitting on the ground because it is farther away from Earth’s surface. Therefore option C is correct.
What is energy ?In order to accomplish labor and to produce heat and light, energy must be transmitted to a body or to a physical systems. Energy is a preserved resource, according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be generated or destroyed.
Examples of these include, electrical energy, sound energy, chemical energy, nuclear or atomic energy, light energy, heat energy, mechanical energy, gravitational energy, and so on.
Thus, option C is correct.
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In a solution, the substance present in the largest quantity is called the __________, while any other dissolved components are called _________.
Answer:
A homogenous mixture of two or more substances is called solution. The substance with the greatest relative amount is called the solvent, while the other substance (s) is called the solute.
Explanation:
What are the first three quantum numbers for the electrons located in subshell 2s?
Answer:
n = 2
ℓ = 0
mℓ = 0
Explanation:
Answer:
The first three quantum numbers are n, l, and m l which would be n= 2, l = 0, and ml = 0 #6. Sublevel l = 3 indicates an f sub shell.
Explanation:
A 20. 0-gram cube of ice at 0. 00°C i dropped into a calorimeter containing 120. Gram of water at 35. 0°C. The ice eventually melted, and the water reached an equilibrium temperature of 18. 1°C. Baed on thi data, what i the heat of fuion, in joule per gram, of water?
The heat of fusion of water is B. 348 J when 20g ice is dropped into the water at 35°C.
The heat of fusion of water is the amount of heat required to melt one gram of ice at 0.00°C. Since the ice melted in this experiment, we know that the heat of fusion must be greater than or equal to the amount of heat lost by the ice.
The heat lost by the ice can be calculated using the following equation:
Q = mc∆T
where Q is the heat lost by the ice, m is the mass of the ice, c is the specific heat capacity of ice, and ∆T is the change in temperature.
Using the values from the experiment, we have:
Q = (20.0 grams)(2.09 J/g°C)(35.0°C - 18.1°C)
Q = 348 J
Hence the correct option is B.
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Why are the noble gases the most stable elements
on the periodic table?
Answer:
They have eight valence electrons, which fill their outer energy level
Explanation:
Noble gases are the least reactive of all elements. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.
Answer:
because their valance shell (outermost shell) is completed with the maximum number of electrons
Explanation:
Which of the substances below are represented with their proper formulas?
a. Elemental phosphorus, P4
b. Elemental copper, Cu
c. Elemental oxygen, O2
d. Elemental sodium, Na+
e. Elemental boron, B2
Elemental Phosphorus P4, Elemental copper Cu, Elemental oxygen O2
Many elements are found as diatomic molecules in their elemental state. These molecules have the generic formula X2 because they contain two atoms connected by one or more covalent bonds. Hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), chlorine (Cl, element 17), bromine (Br, element 35), and iodine are the elements that can be found as diatomic molecules (I, element 53). They have the following molecular formulas: H2, N2, O2, F2, Cl2, Br2, and I2. More than two-atom molecules can include some elements, these elements are polyatomic molecules. At ambient temperature, sulfur is made up of an 8-atom ring connected by only one bond. Selenium can also form 8-atom rings. Each of the four phosphorus atoms that make up white phosphorus is positioned at a tetrahedron's corner. The P4 tetrahedrons are linked together to form a more stable, less reactive allotrope of phosphorus in the more stable red phosphorus.
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The visible spectrum for a colored solution has a maximum absorbance around 500 nm and a maximum % transmittance around 640 nm. What is the color of the solution?.
The colour of the solution is Green.
How does spectroscopy work?
The science of spectroscopy involves analyzing electromagnetic spectra as a function of the wavelength or frequency of the radiation that are produced when electromagnetic radiation interacts with materials.
Lower wavelengths in the visible spectrum, which has a wavelength range between 400 and 700 nm, are equivalent to the violet side of the rainbow spectrum, while higher wavelengths are equivalent to the red side. The violet and red portions of the spectrum should be absorbed by our solution and not be visible because our solution absorbs heavily at about 440 and 600 nm. Green should consequently be the hue that can be seen from the solution because it has the lowest absorption at about 520 nm.
Green is absorbed at a wavelength of 500 nm. This indicates that it will absorb green and display red, which is red's complementary colour.
This is an allusion to spectroscopic techniques that calculate the amount of radiation absorbed in relation to frequency or wavelength when it interacts with an object. For absorption spectroscopy, the complete electromagnetic spectrum is utilized.
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What is the change in entropy when 0. 7 m3 of co2 and 0. 3 m3 of n2, each at 1 bar and 25°c, blend to form a gas mixture at the same conditions? assume ideal gases.
change in entropy for CO2 is 83.78 J/[tex]^{o}C[/tex] and for N2 is 121 J/[tex]^{o}C[/tex]
Entropy Change can be defined as the change in the state of disorder or randomness of a thermodynamic system that is associated with the conversion of heat or enthalpy into work. A system with a great degree of disorderliness or randomness has more entropy.
Entropy also describes how much energy is not available to do work. The more disordered a system is higher is the entropy, the less of a system's energy is available to do work.
To calculate the change in entropy;
For CO2:
Moles of CO2 = [tex]10^{5}[/tex] × 0.7 ÷ (R×298) = 234.9/R
ΔS = 234.9 ln (1/0.7) = 83.78
For N2;
Moles of N2 = [tex]10^{5}[/tex] × 0.3 ÷ (R×298) = 100.7/R
ΔS = 100.7 ln (1/0.3) = 121.24
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What is something that would change
the potential energy in this situation?
Answer:
The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in.
Question 3 intermolecular and intermolecular forces use the molecule CH3 Cl to answer the following questions.
a. Draw the electron dot diagram of each the atoms in the molecule
The electron dot structures of the elements that compose the compound, carbon, hydrogen and chlorine are shown in the images attached.
What is the electron dot structure?We know that the electron dot structure of an element is a representation of the symbol of the element as well as the number of valence electrons that the element has.
When we talk about the valence electrons, we are referring to the electrons that can be found on the outermost shell of an atom and they are the electrons that could be involved in a chemical bond. They may be given out, or combine with other electrons of other atoms in a chemical bond.
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in general, the nature of the cellular response to a chemical messenger is determined primarily by which of the following?
In general, the nature of the cellular response to a chemical messenger is determined primarily by the receptive apparatus of the cell.
What is the cellular response?Cellulаr response is а steаdy stаte of the production of biochemicаl mediаtors in the cell аnd degrаdаtion of those mediаtors аnd there аre numerous wаys this cаn occur. So, cellulаr response cаn be defined аs the finаl step of the cell signаling process in which а specific function or process such аs cell division is initiаted in the cell’s nucleus or cytoplаsm.
Chemicаl messengers (аlso cаlled signаling molecules) trаnsmit messаges between cells. They аre secreted from one cell in response to а specific stimulus аnd trаvel to а tаrget cell, where they bind to а specific receptor аnd elicit а response.
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identify the relationship between (2r,4s)-2-bromo-4-chlorohexane and (2s,4r)-4-bromo-2-chlorohexane.
In the identification of configuration if the priority groups are arranged in a clockwise direction then it is R- configuration if it is anticlockwise then it is S- configuration.
All three isomers are based on a hexane chain or a chain of six carbon atoms. However, isomer 1 has a chlorine atom on the first carbon. So for 1-chlorohexidine one of the hydrogen atoms on carbon number 1 can be removed and replaced with a chlorine atom.
Cyclohexane is an alicyclic hydrocarbon containing a ring of 6 carbon atoms and is the cyclic form of hexane used as a raw material in the manufacture of nylon. Hexane is used as a special solvent and as a cleaning agent to extract edible oils from seeds and vegetables. When hexane is added to water it floats to the surface of the water with no noticeable mixing. The reason why hexane and water do not mix is complicated.
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Draw the electron dot structures for sulfate (SO4 2-) and carbonate (CO3 2-). Sulfur and carbon are the central atoms, respectively.
The Lewis dot structures of the ions have been shown in the image attached.
What is the electron dot structure?The term electron dot structure has to do with the Lewis structure of the compound or the ion. In this structure, what it can show us is the number of atoms that we can find in the ion as well as the number of electrons that can be shown as dots.
If we take a look at the images that have been attached to this answer, they show the Lewis or the electron dot structures of the ions that have been shown as well as the formal charges that the ions are known to carry.
In this case, we can see that the central atom in the carbonate ion is the carbonate atom while the central atom in the sulfate ion is the sulfur atom.
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the reaction in this experiment is the reverse of the hydration of cyclohexene to form cyclohexanol. both reactions are acid catalyzed. how does the use of the hickman still favor the desired product? (review carey 6.9.)
The reaction in this experiment is the reverse of the hydration of cyclohexene to form cyclohexanol is OH H⁺ + H₂O
The forward and backsword reactions are plausible in acidic conditions. To avoid this a special debilitation apparatus is used ic. Chicken al distillation apparatus. The precious, expeckenbeserve besi bugs point 86 degrees C is much lower than the cyclohexanol 165 degrees C. So if the distillation happens, the product evaporates no son as it comes in the reaction and is collected in a separate vessel.
So it would be in contact with acid or reaction mixture for much time. The distillate will contain only the product whereas bestizoru lacy in the reduction veal in eye labels real would Oneida. The feedstock is contaminated with water, unreacted alcohol, phosphoric acid, and some byproducts. Washing with water removes most contaminants. Treatment with sodium carbonate solution removes traces of acid and a final water wash removes the remaining carbonates. Synthesis of alkenes dehydration of cyclohexanol.
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The chemical equation below represents a decomposition reaction.
2KCIO3(s) → 2KCI(s) + 30₂(g)
What is the total number of moles of KCLO 3(s) needed to produce 6 moles of
O₂(g)?
2
3
4
5
In the above chemical equation, the total number of moles needed to produce 6 moles of oxygen is 4 moles (option C).
How to calculate number of moles?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, pottasium chlorate undergoes decomposition reaction to form pottasium chloride and oxygen as follows:
2KCIO₃(s) → 2KCI(s) + 30₂(g)
Based on the above equation, 2 moles of potassium chlorate produces 3 moles of oxygen.
This means that 6 moles of oxygen will be produced by 12/3 = 4 moles of potassium chlorate.
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What are water contaminants
a certain substance has a normal boiling point of and a molal boiling point elevation constant . calculate the boiling point of a solution made of of urea dissolved in of . be sure your answer has the correct number of significant digits.
The boiling point of a solution made of 76 g of urea (NH₂)₂CO dissolved in 850 g of X will be 136.5 °C
Normal boiling point (T1) = 134.5 °C
Molal boiling point constant (Kb) = 1.36 °C.Kg.mol⁻¹
Weight of urea = 76 g
weight of X = 850 g or 0.850 Kg
Boiling point (T2) = ?
Calculate the boiling point elevation by using the following equation:
ΔT = Kb × M
M = molality
Calculate the number of moles of urea
number of moles = mass / molar mass
number of moles of urea = 76 g / 60.06 g/mol
number of moles of urea = 1.3 mol
Calculate the molality
molality = moles of solute / mass of solvent (Kg)
molality of urea = 1.3 mol / 0.850 Kg
molality of urea = 1.5 mol/Kg
Now calculate the ΔT
ΔT = 1.36 °C.Kg.mol⁻¹ × 1.5 mol/kg
ΔT = 2.0 °C
Boiling point (T2) will be:
T2 = T1 + ΔT
T2 = 134.5 °C + 2.0 °C
T2 = 136.5 °C
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a mg oh 2 solution has a concentration of 4.0*10^-5 m. calculate the molarity of each ion in solution.
Magnesium hydroxide has a limited solubility in water and is a weak base. In 1.8 x 10E-6 M solution, there are two hydroxide ions (OH-) per formula unit, or the following number of hydroxide ions per liter:
2(1.8 x 10E-6) = 3.6 x 10E-6 .
What is Molarity ?
A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.
Molarity is measured in units of M or mol/L. One molar is used to describe a 1 M solution.
The amount of moles of solute per liter of solution is known as molarity (M).
Molarity is defined as moles of solute per liter of solution. The amount of moles of solute per kilogram of solvent is known as molality (m). Molality is defined as moles of solute/kg of solvent.
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assuming that the drug components whose spots you identified dissolved completely when you stirred the tablet with 1:1 ethanol/dichloromethane, what was the solid that remained behind?
It would be starch or any other pill-coating material that was left.
Why is dichloromethane a good solvent for extraction?
Dichloromethane can dissolve a variety of organic compounds, despite the fact that it is not miscible with water. These characteristics make DCM a very powerful solvent in many industrial processes, along with its volatility.
What is dichloromethane used for?
Dichloromethane is a solvent used in the production of food. In aerosol formulations, it is used. It is a blowing agent for ethane foam. used in the production of pharmaceutical products as a solvent.
Why is dichloromethane not a good solvent?
DCM and other organic solvents are hazardous due to their high volatility. As a result, they can quickly evaporate.
It would be starch or any other pill-coating material that was left.
This is because starch binds the tablet together but is an inactive ingredient that would not dissolve in the solvent.
Thus, the solid remained behind starch or any pill-coating substances.
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Which one of the following is a weak acid?
a. H2SO4
b. HI
c. HBr
d. HF
e. HClO4
Answer:
HF
Explanation:
1. how many unpaired electrons are in the fluorine atom? this atom is ... a. paramagnetic ... b. diamagnetic fill in the blank 2 ... 2. how many unpaired electrons are in the zinc atom? this atom is ... a. paramagnetic ... b. diamagnetic fill in the blank 4
Number of unpaired electrons present is 1 electron therefore it is paramagnetic in nature. Number of unpaired electrons in zinc is zero therefore it is diamagnetic in nature
The magnetic properties of a compound can be determined from the electronic configuration and the size of the atoms. Because magnetism is generated by the electronic spin. The number of unpaired electrons in a specific compound indicates how magnetic the compound is.
If there are unpaired electrons present in the electronic configuration then the compound is said to be paramagnetic in nature. If the compounds have all paired electrons then the compound is said to be diamagnetic in nature.
In case of Fluorine the atomic number of the atom is 9 so we can see that in the 2p orbital there are 5 electron among which 4 are paired electrons and 1 is unpaired electrons. Hence it is paramagnetic in nature.
Zinc atomic number is 30, and we see that there are no unpaired electrons that are present hence the atom is diamagnetic in nature.
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Distinguish between a covalent bond and an ionic bond
Explanation:
Covalent bonds are formed due to sharing of electrons between two atoms in order to complete their octet, whereas ionic bonds are formed between atoms of metals and non-metals where the metal loses an electron to complete its octet and the non-metal gains that electron to complete its octet.
Learn at brainlyOne sentence in the article states, “Our eyes are made of nerve tissue, blood vessel tissue, muscle tissue, lens tissue, pupil tissue, and many more types of tissue to make the organ called eyes.” What fact is this detail supporting?
The sentence our eyes are made of nerve tissue, blood vessel tissue, muscle tissue, lens tissue, pupil tissue, and many more types of tissue to make eyes is supported by the interaction of these structures to form an organ.
What is an organ?An organ is a group of different tissues (such as in the case of eye the muscle tissue and nerve tissue ) which work together to play one or more particular roles.
Therefore, with this data, we can see that an organ is a group of tissues that play particular roles in the body.
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