The scientific method is used by biologists and other scientists to pose inquiries about the natural world.
The first step in the scientific method is an observation, which prompts a question from the scientist. They then develop a theory—a verifiable explanation—that responds to the query.
A controlled experiment is a scientific test that is carried out under predetermined circumstances, meaning that only one (or a small number of) variables are altered at a time while all other variables are held constant. The element that differs between the experimental and control groups—in this case, the volume of water—is referred to as the independent variable. The response tested in an experiment to establish if a treatment had an impact is known as the dependent variable.
Learn more about biologists:
https://brainly.com/question/28447833
#SPJ4
How can the mixture of sand and naphthalene be separated?
The mixture of sand and naphthalene can be separated using physical methods, such as the following:
Sublimation: Naphthalene has a low boiling point and can be vaporized at a temperature lower than that required to vaporize sand. By heating the mixture, the naphthalene will sublime, leaving behind the sand.
Filtration: Sand can be separated from the mixture by filtration, as it is a solid and can be filtered out through a porous filter paper, while the liquid naphthalene will pass through the filter.
Centrifugation: The mixture can be placed in a centrifuge and spun at high speed. The heavier sand particles will settle at the bottom, while the lighter naphthalene will form a separate layer on top.
Learn more about Naphthalene here:
https://brainly.com/question/23779998
#SPJ4
what is the molarity of a solution that was prepared by dissolving 82.0 g of CaCl2 in enough water to make 812 mL of solution
The molarity of a solution that was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution is 0.91M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution
The Molarity of a solution can be calculated using the following formula:
Molarity = no of moles ÷ volume
According to this question, a solution was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution. The molarity can be calculated as follows:
no of moles of Calcium chloride = 82.0g ÷ 110.98 g/mol = 0.74 mol
Molarity = 0.74 ÷ 0.812 = 0.91M
Learn more about molarity at: https://brainly.com/question/29884686
#SPJ1
The rate of the reaction is 1.6 x 10-2 M/s when the concentration of A is 0.35 M. Calculate the rate constant if the reaction is (a) first order in A and (b) second order in A.
The rate of the reaction is 1.6 × 10⁻² M/s. When the concentration of A is 0.35 M. The rate constant if the (a) First order in A = 0.0457 s⁻¹ (b) Second order in A 0.130 M s⁻¹.
The rate of the reaction = 1.6 × 10⁻² M/s
The concentration of A = 0.35 M
(a) First order in A
Rate = k[A]
where,
k = the rate constant
By solving the value , wet
k = r / [A]
k = 1.6 × 10⁻² M/s / 0.35 M
k = 0.0457 s⁻¹
The rate constant is 0.0457 s⁻¹.
(b) Second order in A
Rate = k [A]²
where,
Rate = 1.6 × 10⁻² M/s
k = r / [A]²
k = 1.6 × 10⁻² M/s / ( 0.35 M)²
k = 0.130 M s⁻¹
The rate constant is 0.130 M s⁻¹.
To learn more about rate constant here
https://brainly.com/question/24125678
#SPJ4
What mass of iodine is formed when 50.0 mL of 0.020 M KIO3 solution reacts with an excess of KI and HCl according to the following reaction? KIO3 + 5 KI + 6 HCl ? 3 I2 + 6 KCl + 3 H2O
The mass of the iodine is formed when 50.0 mL of 0.020 M KIO₃ solution reacts with an excess of the KI and HCl is 0.76 g.
The chemical reaction is as :
KlO₃ + 5KI + 6HCl ----> 3I₂ + 6KCl + 3H₂O
The molarity of the KlO₃ = 0.020 M
The volume of the KlO₃ = 50 mL = 0.050 L
The molarity expression is as :
Molarity = moles / volume in L
Moles = molarity × volume
Moles = 0.020 × 0.050
Molarity = 0.001
1 mole of the KlO₃ = 3 moles of I₂
The moles of the I₂ = 3 × 0.001
= 0.003 mol
The mass of the I₂ = moles × molar mass
= 0.003 × 253.8
= 0.76 g
To learn more about mass here
https://brainly.com/question/29312906
#SPJ4
How do you determine the charges on the ions in an ionic compound?
The group number of a metal is proportional to the amount of charges on an ion that metal forms. The group number less eight determines how often charges are represented on a non-metal ion.
How do you determine an ion's charge?Protons are subtracted from electrons. The simplest method for calculating the charge of the ion is to deduct the quantity of electrons first from number of protons present in the atom.
An ionic compound is what?The type of chemical that emerges from the formation of an ionic link between two ions with opposite charge is known as an ionic compound. When an ion comprises just one class of atom, it is known as an atomic ion or a monoatomic ion.
To know more about metal visit :-
https://brainly.com/question/29404080
#SPJ1
the diameter of the he h e atom is approximately 0.10 nm n m . calculate the density of the he atom in g/cm3 g / c m 3 (assuming that it is a sphere). express your answer in grams per cubic centimeter.
The density of the Helium atom is 9.5 * 10^35 g/cm^2.
What is density?Density is a measure of mass per unit of volume of a substance or object. It is calculated as the ratio of the mass of an object to its volume and is usually expressed in kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3).
We know that the mass of the atom of the helium is 4 g and the density of the atom is 0.10 nm or 1 * 10^-12 cm.
Volume of the atom = 4/3 πr^3
= 4.2 * 10^-36 cm^3
Then we must write that;
Density = mass/volume
Density = 4 g /4.2 * 10^-36 cm^3
Density = 9.5 * 10^35 g/cm^2
Learn more about density:https://brainly.com/question/29775886
#SPJ1
Production aociate are not allowed to view the proce afety management document. They are only for upervior and upper management?
The given statement, production associates are not allowed to view the process safety management documents. They are only for supervisors and upper management is true.
Since they provide advice on how to manage the risks and hazards connected to certain operations or processes, these documents are often written with supervisors and top management in mind. This is done to make sure the management team has the knowledge it needs to decide on process safety in an informed manner and to make sure the right safety measures are in place to safeguard employees and the neighbourhood.
It is crucial to remember that a person's unique job responsibilities and the level of access required to carry out those duties should determine who has access to PSM documents. If it's necessary for them to carry out their duties, some production associates might have access to particular PSM documents.
To learn more about process safety management
https://brainly.com/question/16818668
#SPJ4
an empty 10 ml volumetric flask weighs 10.2634 g. when the flask is filled to the mark with distilled water and weighed again in the air at 20 degrees celsius, the mass is 20.214 g. what is the true volume of the flask at 20 degrees celsius
The true volume of the flask at 20°C is 10.00 mL.
The volume of a volumetric flask is determined by filling it to the mark with a liquid of known density and measuring the mass. The difference between the mass of the empty flask and the mass of the filled flask is equal to the mass of the liquid, which can then be used to calculate the volume of the liquid. In this case, the mass of the distilled water is
20.214 g - 10.2634 g = 9.9506 g.
The density of water at 20°C is approximately 0.9970 g/mL, so the volume of the water is given by:
Volume = mass / density = 9.9506 g / 0.9970 g/mL = 10.00 mLThis is the true volume of the flask at 20°C, which is equal to the volume indicated on the flask. The volumetric flask is designed to be used at a specific temperature (usually 20°C), and the volume indicated on the flask is calibrated to be the true volume at that temperature. It is important to measure the temperature of the liquid and the flask before using a volumetric flask to ensure accurate results.
Learn more about volume :
https://brainly.com/question/27100414
#SPJ4
why is vanillin aldehyde peak smaller on ir spectra?
The intensity of a peak in an IR spectra is related to the strength of the molecular vibration causing that peak. There are several factors that can influence the intensity of an IR peak, including the bond strength and bond polarity of the molecule.
In the case of vanillin, it is possible that the aldehyde peak is smaller compared to other peaks in the IR spectra due to the relative strength and polarity of the C=O bond. Aldehyde functional groups typically exhibit a strong C=O stretching vibration in the IR region, however, the intensity of this vibration can be affected by the specific chemical environment of the aldehyde group in the vanillin molecule. For example, if the aldehyde group is involved in hydrogen bonding or if it is part of a larger, more complex molecule, the intensity of the aldehyde peak may be reduced.
Learn more more vibration here:
https://brainly.com/question/20999521
#SPJ4
suppose you measured the volume of the metal plate using a device with 0.001 mm pre- cision for all dimensions. what precision in the volume would be achieved?
The volume can be achieved till the precision of 0.003 mm.
Precision is defined as the degree to which repeated measurements agree with each other. Significant figures indicate the precision of a measuring tool that was used to measure a value. The more precise the measuring tool, the more precise and accurate the measurements can be.
The length, width and thickness of the plate can be multiplied to get the volume of the plate.
Volume V = Length*Width*Thickness
And using the precision formula,
[tex]\triangle V = \triangle L+\triangle W +\triangle T[/tex]
The precision is for length, width and thickness is, 0.001 mm.
Therefore the precision in volume is, 0.001 + 0.001 + 0.001 = 0.003 mm.
To know more about the precision, here
brainly.com/question/1311561
#SPJ4
before the advent of esi mass spectrometry, analysis of compounds was limited to molecules smaller than how many amu?
Before the advent of electrospray ionization (ESI) mass spectrometry, analysis of compounds was limited to molecules with a molecular weight of less than 1000 amu (atomic mass units).
This was due to the fact that many molecules with a higher molecular weight were not volatile enough to be analyzed using traditional mass spectrometry methods.
Additionally, the introduction of electrospray ionization allowed for the analysis of molecules in their native state, as opposed to traditional methods which often required the molecules to be fragmented first. This provided a much more accurate representation of the analyzed molecules, which was invaluable for the analysis of complex molecules such as proteins or nucleic acids.
Learn more about electrospray ionization:
https://brainly.com/question/28358172
#SPJ4
A solution contains 50g of common salt in 450g of water. calculate the concentration of the solution.
Answer:
11.11%
Explanation:
The concentration of the solution can be calculated by dividing the mass of the solute (common salt) by the mass of the solvent (water) and then multiplying by 100.
The concentration of the solution is:
(50g / 450g) x 100 = 11.11%.
what is the sum of the numbers of neutrons and electrons in the ion 116sn3 ?
The sum of the numbers of neutrons(present in the atomic nucleus) and electrons(present outside the atomic nucleus) in the ion 116sn3+ is 113.
Atomic number of Sn (Tin) is 50. This means that isolated Sn atom has 50 electrons. Number of electrons = number of protons in nucleus. So, isolated Sn atom has 50 protons in nucleus. According to question, we have Sn3+ ion. This ion lost 3 electrons from its valence shell. But, the 50 protons still remain in its nucleus. Now, atomic mass = number of protons + number of neutrons in atomic nucleus. Given atomic mass number is 116. Hence, 116 = 50 + number of neutrons in atomic nucleus. Thus, number of neutrons in atomic nucleus = 116 - 50 = 66. The question asked for the sum of the numbers of neutrons and electrons in the ion 116sn3+ , which is 66+ 47 = 113.
To know more about atomic nucleus, click here : https://brainly.com/question/1268608
#SPJ4
Which quantum number represents the individual orbital (orientation of the orbital) an electron occupies?
Magnetic Quantum Number represents the individual orbital (orientation of the orbital) an electron occupies.
What exactly is the magnetic quantum number?Between spin and azimuthal quantum number, the magnetic quantum figure comes in third on the list. The electron is placed in one of the numerous orbitals established by the partition of the subshells (such as s, p, d, and f). It determines the spatial direction of an orbital of a certain energy (n) and form (I).
Which four quantum numbers are there?The primary quantum number (n), the orbital angular momentum quantum number (l), the magnetic quantum number (ml), and the electron spin quantum number are the four quantum numbers that comprise an atom (ms)
Learn more about quantum number here:
brainly.com/question/24204727
#SPJ4
Which of these substances are heterogeneous mixtures?
I. steam
II. milk of magnesia
III. crude oil
IV. rubbing alcohol
a. II and III
b. I and IV
c. II, III and IV
d. I, III and IV
e. I, II, and III
The substances are the heterogeneous mixtures are : a. II and III that is the milk of magnesia and the crude oil.
The mixture are formed when two or the more substances are mix together without taking part in the chemical change. The heterogeneous mixture is the mixture where the components throughout the solution is not uniform. The mixture are two types :
Homogeneous mixtureHeterogeneous mixtureIn the heterogenous mixture the particles is distributed non uniformly and it can not be separated by the physical method.
Thus, the heterogenous mixture in the given option are the milk of the magnesia and the crude oil.
To learn more about heterogenous mixture here
https://brainly.com/question/30379611
#SPJ4
a solution is a 2:1 mixture of two volatile components a and b. pure b has a vapor pressure double of the vapor pressure of pure a. the total vapor pressure of the solution equals to:
The total vapor pressure of the 2:1 mixture of component a and component b is equal to 3 times the vapor pressure of pure component a.
The total vapor pressure of a solution is given by the Raoult's law, which states that the vapor pressure of a component in a solution is proportional to its mole fraction.
Let the vapor pressure of pure component a be denoted as Pₐ and the vapor pressure of pure component b be denoted as 2Pₐ.
The mole fraction of component a in the solution is xₐ and the mole fraction of component b is xb = 1 - xₐ.
Then, the total vapor pressure is:
= P
= xₐPₐ + xb(2Pₐ)
= (xₐ)Pₐ + (1 - xₐ)(2Pₐ)
= Pₐ + 2Pₐ - 2xₐPₐ
= 3Pₐ.
Thus, the total vapor pressure of the 2:1 mixture of component a and component b is equal to 3 times the vapor pressure of pure component a.
To know more about vapor pressure please refer: https://brainly.com/question/11864750
#SPJ4
Of the following, indicate which are pentose sugars.D-FructoseD-ThreoseL-GlucoseD-SorboseGlyceraldehydeNone of the Above
Pentose sugars include (Glyceraldehyde) and (None of the Above).
c are a class of monosaccharides, which are simple sugars, consisting of five carbon atoms. They are crucial components of many biological processes, including the synthesis of nucleic acids (DNA and RNA) and the production of energy. Ribose, which is a component of RNA, is the most prevalent pentose sugar. Xylose, a pentose sugar that is present in many plant cell walls and is utilised as a sweetener, is a further significant pentose sugar. Pentose sugars, in contrast to hexose sugars (such as glucose and fructose), cannot be digested by humans and must be consumed through diet. They are crucial for the creation of biofuels as well since they may be fermented to create ethanol. In conclusion, pentose sugars are essential parts of numerous biological systems.
Learn more about Pentose sugars here:
https://brainly.com/question/14086318
#SPJ4
How many grams of NH4Br should be used to prepare 2.00 L of 0.350 M solution
Molarity equals moles times volume.A 0.115M KBr solution needs 350 mL, or 4.79 grams, of KBr.
How is molarity calculated ?The following expression can be used to determine a solution's molarity:
Molarity equals moles times volume.
A 0.115M KBr solution in the volume of 350mL was sent in response to this inquiry.
Moles can be counted using the formula below:
mole number = 0.350 0.115
Number of Mole Units: 0.0403 Mol
KBr's molar mass is 39 + 80 = 119 g/mol.
KBr's mass is 119g/mol + 0.0403 mol.
KBr mass equals 4.79g
Therefore, to create 350 mL of a 0.115M KBr solution, 4.79 grams of KBr are needed.
A 0.115M KBr solution needs 350 mL, or 4.79 grams, of KBr.
To learn more about molarity refer
https://brainly.com/question/8596433
#SPJ1
draw the structure of the major organic product formed when the given alkyl halide is treated with potassium tert‑butoxide.
The major organic product formed when the given alkyl halide is treated with potassium tert‑butoxide is cyclohexadiene.
Positions that are isolated from carbonyls or any other groups that pull electrons are likewise susceptible to elimination processes. Proton abstraction at the C atom occurs simultaneously with the cleavage of the C-X bond in one concentrated phase, or it can occur in two steps (the C-X bond is first broken to produce a carbocation intermediate, which is subsequently "quenched" by proton abstraction at the alpha atom).These mechanisms, termed E2 and E1, respectively, are important in laboratory organic chemistry
When the alkyl halide reacts with potassium tert-butoxide is cyclohexadiene.
Learn more about cyclohexadiene
brainly.com/question/29987619
#SPJ4
Rocco need to make two compound for an experiment he i performing, Lithium Chloride (LiCl) and Magneium Bromide (MgBr2). Both compound are formed uing the following chemical reaction:
Li Cl -> LiCl Heat
Mg Br -> MgBr2 Heat
When Rocco prepare thee compound, he alway ue the SAME AMOUNT of halogen but notice that he only end up with much le magneium compound compared to lithium compound. Anwer the following
1) I Rocco making or breaking bond when he prepare thee compound? Provide 2 piece of evidence for thi
2) What type of bond occur in thee compound, provide 2 piece of evidence for bond type
3) Uing your knowledge of oxidation number, explain WHY Rocco i only getting half a much magneium compound than lithium compound when preparing thee chemical. What SHOULD Rocco do to increae hi yield?
Roco being chemist preparing compounds, and ionic bonds. The answer of the questions are the given below:
1. Rocco is making bonds when he prepares the compounds.
Evidence:
Heat is being applied, which is a common way to provide energy to form chemical bonds.The products of the reactions, LiCl and MgBr2, are both compounds, indicating that new bonds have been formed.2. The bonds in these compounds are ionic bonds.
Evidence:
Lithium and chlorine, as well as magnesium and bromine, are both pairs of elements with large differences in electronegativity, indicating the formation of ionic bonds.The products of the reactions, LiCl and MgBr2, have a crystal lattice structure, which is characteristic of ionic compounds.3. Rocco may only be getting half as much magnesium compound because magnesium has a higher electronegativity than lithium, meaning that magnesium attracts electrons more strongly than lithium does. This means that the magnesium-bromine bond is stronger and therefore requires more energy to form. To increase his yield, Rocco could try to add more energy to the reaction, for example by using a higher temperature or longer reaction time.
You can learn more about chemical bonds at
https://brainly.com/question/819068
#SPJ4
What is the chemical symbol for calcium in the periodic table of elements?
The chemical symbol for calcium in the periodic table of elements is Ca. The atomic number of calcium is 20.
What is calcium's valency?Calcite belongs to group 2. The quantity of valence electrons in a group 2 element determines its valency. In this case, calcium has two valence electrons. Consequently, valency is 2.
What are calcium's three uses?For the treatment and prevention of low calcium levels, muscle cramps, osteoporosis, bone softening, and PMS, people frequently take calcium orally. Additionally, it is used to treat cancer, stroke, high blood pressure, and numerous other illnesses, but many of these other uses lack solid scientific backing.
Where on the periodic table is calcium located?Alkaline earth metal calcium, denoted by the symbol Ca, is located in the second column of the periodic table. It has a 20-atomic weight. The periodic table's fourth row, below the magnesium, contains it.
To know more about calcium visit:
https://brainly.com/question/18774218
#SPJ4
what type of charge does a hydrogen atom carry when it is bonded to another atom by a hydrogen bond?
The type of charge does a hydrogen atom carry when it is bonded to another atom by a hydrogen bond will be partial positive charge
Partial positive charge, a hydrogen atom carries a partial positive charge when it is bonded to another atom by a hydrogen bond
A hydrogen patch forms from two hydrogen titles, each with one electron in a 1 s orbital. The two hydrogen titles are attracted to the same brace of electrons in the covalent bond. The bond is either a brace of “ blotches ” or a solid line.
Two hydrogen atoms, each of which has one electron inside a 1 s orbital, combine to create a hydrogen molecule. The covalent bond's identical electron pair attracts the two hydrogen atoms. The bond is shown as a solid line or as an pair of "dots."
To know more about the covalent bond.
https://brainly.com/question/10777799
#SPJ4
as the crate slides a distance d, how does the new gain in kinetic energy compare to ∆k?
The crate slides the distance d, the new gain in kinetic energy compare to ∆k is that the new gain will be less than delta ∆k.
The force of magnitude = F
An angle = Ф
The surface will exerts the normal force of magnitude = F (N)
The crate slide at distance = d
The less horizontal force = the less velocity, the less kinetic energy.
Δ K = Fd Cos Ф. If the ΔK decreases
Therefore the , new gain will be less than delta ∆k.
The Kinetic energy is the energy of an object because of its motion. The main component of the kinetic energy are the movement and the moving objects. The Kinetic energy will never present in the object at rest, it present only in the objects that are moving.
This question is incomplete, the complete question is :
a crate is on a horizontal frictionless surface. a force of magnitude F is exerted on the crate at an angle (theta) to the horizontal, causing the crate to slide to the right. The surface exerts a normal force of magnitude F(N) on the crate. as the crate slides a distance d, it gains an amount of kinetic energy delta K. while f is kept constant, the angle theta is now doubled but is still less than 90 degrees. assume the crate remains in contact with the surface.
as the crate slides a distance d, how does the new gain in kinetic energy compare to ∆k?
To learn more about kinetic energy here
https://brainly.com/question/13328588
#SPJ4
Consider the partial sequence of a peptide. I L W A N R M S H V L F A V E A Select all amino acid residues likely to be on the solvent exposed surface once the peptide folds into its native conformation. Hint: Amino acids with nonpolar, or hydrophobic, side chains are generally in the interior of proteins. They do not come into contact with the aqueous solvent. a. L b. W c. A d. N e. R f. M g. S h. H i. V
j. F k. E l. J
The given peptide, amino acid residues likely to be on the solvent exposed surface once the peptide folds into its native conformation are: A, N, R, S, H, V, F, E, and A.
The solvent-exposed surface of a folded protein is composed of amino acid residues with polar or charged side chains. These side chains can interact with the aqueous solvent, whereas nonpolar, or hydrophobic, side chains remain in the interior of the protein. To calculate the relative solvent-exposed surface area of a particular amino acid residue, we use the formula:
SAS = [H-bond acceptor (A) + H-bond donor (D) + polar (P) + charged (C)] / Total number of residues
For example, for the given peptide (I L W A N R M S H V L F A V E A):
L – H-bond acceptor (A): 0 + H-bond donor (D): 0 + polar (P): 0 + charged (C): 0 = 0 / 12 = 0
W – H-bond acceptor (A): 3 + H-bond donor (D): 1 + polar (P): 1 + charged (C): 0 = 5 / 12 = 0.417
A – H-bond acceptor (A): 1 + H-bond donor (D): 0 + polar (P): 1 + charged (C): 0 = 2 / 12 = 0.167
N – H-bond acceptor (A): 2 + H-bond donor (D): 0 + polar (P): 0 + charged (C): 0 = 2 / 12 = 0.167
R – H-bond acceptor (A): 3 + H-bond donor (D): 1 + polar (P): 0 + charged (C): 1 = 5 / 12 = 0.417
M – H-bond acceptor (A): 0 + H-bond donor (D): 0 + polar (P): 0 + charged (C): 0 = 0 / 12 = 0
S – H-bond acceptor (A): 1 + H-bond donor (D): 0 + polar (P): 0 + charged (C): 1 = 2 / 12 = 0.167
H – H-bond acceptor (A): 2 + H-bond donor (D): 1 + polar (P): 0 + charged (C): 0 = 3 / 12 = 0.25
V – H-bond acceptor (A): 1 + H-bond donor (D): 0 + polar (P): 1 + charged (C): 0 = 2 / 12 = 0.167
L – H-bond acceptor (A): 0 + H-bond donor (D): 0 + polar (P): 0 + charged (C): 0 = 0 / 12 = 0
F – H-bond acceptor (A): 0 + H-bond donor (D): 0 + polar (P): 1 + charged (C): 0 = 1 / 12 = 0.083
A – H-bond acceptor (A): 1 + H-bond donor (D): 0 + polar (P): 1 + charged (C): 0 = 2 / 12 = 0.167
V – H-bond acceptor (A): 1 + H-bond donor (D): 0 + polar (P): 1 + charged (C): 0 = 2 / 12 = 0.167
E – H-bond acceptor (A): 2 + H-bond donor (D): 0 + polar (P): 0 + charged (C): 0 = 2 / 12 = 0.167
A – H-bond acceptor (A): 1 + H-bond donor (D): 0 + polar (P): 1 + charged (C): 0 = 2 / 12 = 0.167
Therefore, from the given peptide, amino acid residues likely to be on the solvent exposed surface once the peptide folds into its native conformation are: A, N, R, S, H, V, F, E, and A.
Learn more about amino acid here:
https://brainly.com/question/14583479
#SPJ4
Answer:HESNR
Explanation:
HESNR is the correct answer because they are polar and hydrophilic
oxygen, whose atomic number is eight, has three stable isotopes: 16o, 17o, and 18o. explain what this means in terms of the number of protons and neutrons.
The number of protons and neutrons in 16o will be 8 protons + 8 neutrons, 17o will be 8 protons + 9 neutrons and 18o will be 8 protons +10 neutrons.
Isotopes are the two or more types of atoms (or nuclides is the technical term) that have the same atomic number (number of protons in their nuclei) as well as the position in the periodic table (and hence belong to the same chemical element), and that is differ in nucleon numbers (mass numbers) due to the different numbers of neutrons in their nuclei
Oxygen has three stable isotopes: 16o, 17o, and 18o. The atomic number of an element is the total number of protons in an isotope. The number of neutrons is the difference between the mass as well as the atomic number
16= 8 protons + 8 neutrons
17= 8 protons + 9 neutrons
18= 8 protons +10 neutrons
To know more about isotopes here
https://brainly.com/question/11680817
#SPJ4
2) How much heat in kJ is
required to boil 50.0 grams of
water?
Answer:
The heat required to boil water is called the heat of vaporization, and it is the amount of energy required to change the state of a substance from a liquid to a gas at a constant temperature. The heat of vaporization for water is approximately 40.7 kJ/mol or 2257 J/gram.
To calculate the heat required to boil 50.0 grams of water, you would multiply the heat of vaporization (2257 J/g) by the number of grams of water:
Heat (J) = 2257 J/g x 50 g
Heat (J) = 112,850 J
To convert Joules to kilojoules (kJ), divide by 1000.
Heat (kJ) = 112,850 J / 1000 = 112.85 kJ
Therefore, it takes 112.85 kJ of heat to boil 50.0 grams of water.
What are the two reaon the foil on Vega iland i of particular importance to undertanding the climate and location of Antarctica million of year ago?
The two reasons the fossil found on vega island is of particular importance to understanding the climate and location of Antarctica millions of years ago are Isotopic composition and Paleoclimate proxies
Isotopic composition: The isotopic composition of rocks and residue in Antarctica can uncover significant hints about past climate and temperature conditions.
For instance, the proportion of isotopes, for example, oxygen and hydrogen can give data about the temperature of the climate when the stone or silt was framed.
This data can be utilized to decide if Antarctica was situated in a warm or cold climate a long period of time prior and how the climate has changed over the long run.
Paleoclimate proxies: Paleoclimate proxies are indirect indicators of past climate conditions and are many times found in silt and rock deposits.
For instance, dust grains can demonstrate the sorts of plants that existed in a specific region and the climate conditions they expected to develop. Essentially, the presence of specific minerals, like calcite or aragonite, can give data about the temperature and saltiness of the water in which they are framed.
By examining these proxies, researchers can recreate past climate conditions in Antarctica and gain a superior comprehension of how the climate has changed after some time.
To learn more about fossils found on vega island:
https://brainly.com/question/6451268
#SPJ4
what is f1 in the element table
f1 refers to the first electron shell or energy level in an element's electron configuration.
In the periodic table, elements are arranged based on the number of protons in their nucleus and the electron configuration of each element.
The electron configuration specifies the arrangement of electrons in each of the element's energy levels. The first energy level, denoted as f1, is the closest to the nucleus and can contain a maximum of 2 electrons.
This information is useful for determining the chemical and physical properties of elements, including their reactivity and bonding behavior.
To learn more about element , visit:
https://brainly.com/question/17105472#
#SPJ11
Chemitry Homework on Significant figure (HWS2Q3W33)
1. Determine the number of ignificant figure in each meaurement. A. 508. 0 L= ________
b. 820,400. 0 L=________
c. 1. 0200×105 kg=__________
d. 807,000 kg___________
2. Determine the number of ignificant figure in each meaurement. A. 0. 049450 =________________
b. 0. 000482 mL=_______________
c. 3. 1587×10–4 g=_______________
d. 0. 0084 mL=________________
3. Write the number 10, 100, and 1000 in cientific notation with two, three, and four ignificant figure, repectively
The concept of significant figures is a crucial aspect of chemistry. In chemistry, significant figures are used to convey the level of precision of a measurement.
The number of significant figures in a measurement is the number of digits that are known with certainty, plus one additional digit that is estimated. This concept is used in a variety of different types of measurements, including volume, mass, and length.
1.) a. 3 significant figures (508.0)
b. 5 significant figures (820,400.0)
c. 5 significant figures (1.0200 x 10^5 kg)
d. 6 significant figures (807,000 kg)
2.) a. 7 significant figures (0.049450)
b. 3 significant figures (0.000482 mL)
c. 7 significant figures (3.1587 x 10^-4 g)
d. 4 significant figures (0.0084 mL)
3.) 10 with 2 significant figures: 1.0 x 10^1
100 with 3 significant figures: 1.00 x 10^2
1000 with 4 significant figures: 1.000 x 10^3
By understanding the concept of significant figures, chemists are able to communicate their results accurately and effectively.
Learn more about significant figures at :https://brainly.com/question/29153641
#SPJ4
The pain reliever mefenamic acid contain an active ingredient called Ibuprofen C13H18O2. What i the molar ma of thi compound?
Molar mass of Ibuprofen is 206.29 g/mol.
A non-steroidal anti-inflammatory medicine called ibuprofen is used to treat inflammation, fever, and pain. This includes rheumatoid arthritis, migraines, and painful menstrual cycles. It can also be used to close a premature baby's patent ductus arteriosus. It can be administered intravenously or orally. Ibuprofen is a pain reliever that can be purchased without a prescription over-the-counter. It belongs to the class of medications known as non-steroidal anti-inflammatory medicines (NSAIDs) and is used to treat mild to severe pain, including toothache, migraine, and period pain. If you have ever experienced an allergic reaction or signs like wheezing, avoid taking ibuprofen by mouth or applying it to your skin. Ibuprofen is C13H18O2 so
Molar mass= 13*12+ 18*1 + 16*2 = 206
Learn more about Ibuprofen
brainly.com/question/29807990
#SPJ4
