The student can claim: We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.
Since the student used the same electronic balance with an uncertainty of 0.05g to measure the mass of the solution before and after chemical reaction, the conclusion is that the masses are the same within the uncertainty of the balance.
+- value is uncertainty value of measurement.
Accuracy is the closeness of a measurement to the true value.
Balance is an instrument for comparing the mass of two bodies.
The percent error is an error between an observed value and the true value of a measurement.
Percent Error = (Actual Value - Estimated Value / Actual Value) × 100%
There are three types of error in chemistry: gross errors, random errors and systematic errors.
Missing options:
The mass definitely stayed the same because the measurement of 50.25 g was obtained each time.
The mass definitely stayed the same because the ranges of uncertainty overlap exactly.
We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.
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if the bonds of a reactant molecule break so that simpler molecules, atoms or ions form, the reaction is an exchange reaction.
If the bonds of a reactant molecule break so that simpler molecules, atoms or ions form, the reaction is an exchange reaction called decomposition reaction
What is a decomposition reaction ?Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium chlorate (KClO3) is a typical technique used in laboratories to generate oxygen gas.
Heat-induced breakdown is known as thermolysis. Decomposition caused by electricity is known as electrolysis. Decomposition brought on by light is referred to as photolysis. Heat-induced chemical reaction when one material splits into two or more compounds.The opposite of a combination reaction is supposedly a decomposition reaction. A chemical decomposes into two or more components in a decomposition reaction, whereas in a combination reaction, two or more substances combine to create new molecules while also releasing energy.Learn more about Decomposition reaction here:
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________ can be
made in the field or in the laboratory.
Answer:
observations
Explanation:
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Is Fe+S classified as a mixture, an element, or a compound?
Is Fe+S classified as as compound
Iron and sulfur are both elements from the periodic table of elements each one has its own unique physical and chemical properties iron is a metal, and sulfur is a nonmetal. when these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide when iron and sulphur are mixed then the reaction is called as redox reaction or oxidation reduction reaction in that reaction Fe loses electron that is Fe is undergoing in oxidation and we know that the substance which itself undergo oxidation act as a reducing agent so in this case Fe is the reducing agent. Fe+S is a compound because compound means the substance made from two or more different element that have been chemically joined and mixture means made up of two or more chemical component that are not chemically joined called mixture so given iron sulphide is a compound.
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Please help me with chemistry questions!
what is the difference between melting and fusion?
Melting occurs when a solid changes state into a liquid.
Fusion occurs when a liquid changes state into a solid.
(So, basically, they are opposite of each other)
Hope this helps!
Have an awesome day!
A child attending daycare is prescribed 750 mg of an antibiotic for 10 days. The drug may be dosed in several ways and is available in two concentrations. Which dosing regimen will the provider consider to best assure drug adherence? group of answer choices 375 mg of a 250 mg/5 ml solution po twice daily 250 mg of a 250 mg/5 ml solution po three times daily 250 mg of a 500 mg/5 ml solution po three times daily 375 mg of a 500 mg/5 ml solution po twice daily
The best kind of prescription for the child is 250 mg/5 ml solution po three times daily.
What is a dose?The term dose has to do with the quantity or amount of the drug that a patient is required take. We must know that a drug is a chemical and being a chemical, there must be a specified amount of it that has to be taken per day.
We know that the dose of the drug that is given to a patient is sometimes in proportion to the degree of symptoms that the patient is feeling. In this case, we can see that the drug is given in more than one dose. We now have to find out the correct dose of the drug that is required in this case.
Let us look at the drug, we are told that a child attending daycare is prescribed 750 mg of an antibiotic for 10 days. The best kind of prescription for the child is 250 mg/5 ml solution po three times daily.
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what is the maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen? question 4 options: 1 6 4 2
Maximum number of covalent bonds that an oxygen atom can make with hydrogen is 2.
the ground state electronic configuration of oxygen is 2s² 2p⁴ that means it has 6 electrons in its valence shell and require two electrons are required to complete its octate. Two bonds are created when an electron donor atom shares the two needed electrons with oxygen. The ability of two oxygen atoms to share valence electrons results in the creation of a double bond between the two atoms.There are no longer any empty orbitals in the octet of oxygen after it is complete. As a result, it is unable to accept more electrons or create more bonds.Therefore, Oxygen can only generate two bonds because it needs two additional electrons to complete its octet, after which it will run out of empty orbitals in which to receive additional electrons and create additional bonds.
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the symbol for xenon (xe) would be a part of the noble gas notation for the element antimony. cesium.
The symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.
For writing the electronic configuration of any element by using the preceding noble gas configuration, we simply use the symbols of noble gas belongs to the previous period of that particular elements. We can't use the symbol of noble gas of same period from which the element belong.
A is the wrong option because the noble gas in the preceding period to the period from which antimony belongs is krypton.
The actual electronic configuration of antimony is as follow:
[Kr] 4d10 5s2 5p3
B is correct option because the noble gas in the preceding period to the period from which Cesium belongs is Xenon.
The actual electronic configuration of Cesium is as follow:
[Xe] 6s1
Thus, we concluded that the symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.
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1. A dog with a mass of 3.5 kg goes for a run at a pace of 1.4 m/s. What is the
dog's kinetic energy?
If a 1.5 L saucepan is heated from 22 degrees celsius to 100 degrees celsius, by what percentage will any gas in the pan increase in volume?
Explanation:
[tex] \frac{p1v1}{n1t1} = \frac{p2v2}{n2t2} (ideal \: gas \: equation) \\ \frac{v1}{t1} = \frac{v2}{t2} \\ convert \: degrees \: to \: kelvin \: \\ \frac{1.5l}{297k} = \frac{v2}{373k} \\ v2 = 1.88l \\ it \: increased \: by \: 80\%[/tex]
Use the atomic mass of lithium to calculate the relative abundances of the two isotopes.
Lithium has two isotopes. Lithium-6 has a atomic mass 6.01512 amu and Lithium-7 has a atomic mass 7.01601 amu. The average atomic mass of Lithium is 6.941 amu.
Let's take the relative abundance of Lithium-6 as X and the relative abundance of Lithium-7 as Y. The sum of the relative abundances is always taken to be 1.
X+Y=1
X=1-Y
The average atomic mass can be expressed as the following, based on the atomic masses and relative abundance of the two isotopes
6.941 = X(mass of Li-6) + Y(mass of Li-7)
6.941= 1-Y(6.01512) + Y(7.01601 )
from the above equation, Y=0.92506
Solving for X
X=0.07494
Therefore, the relative abundance of lithium-7 is 92.506% and that of lithium-6 is 7.494%
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Perform the following problem. Round your answer appropriately.
8.1456 - 5.12 =
The difference between 8.1456 - 5.12 will be 3.0256 and rounding it off will give 3.
How to subtract the numbers?It should be noted that the information given is that we should subtract 5.12 from 8.1456.
It should be noted that subtraction is used when we want to deduct a number from another number. It is taking away a number form another one.
In this case, we will take away 5.12 from 8.1456. This will give the difference between the numbers.
Therefore, 8.1456 - 5.12 = 3.0256
Therefore, the difference is 3.0256 and rounding it appropriately will give a value of 3.
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EXPLAIN ONE REASON WHY COPPER WIRE WAS USED TO MAKE THE COPPER FLOWERS
Bromine is in its liquid state at 25 °C. Explain what this tells you about its melting point and boiling point.
Explanation:
Bromine is a halogen in group VII A of the periodic table with atomic number 35,an atomic weight of 79.91, and a density of 3.12 Mg.In the solid state it forms a cubic crystal with a melting point of -72 C and boiling point of 58 C.
Bromine's liquid state at 25°C indicates melting point below 25°C and boiling point above 25°C.
The observation of bromine being a liquid at 25°C reveals important details about its melting and boiling points. Since it exists as a liquid at this temperature, it signifies that its current state is beyond its melting point.
Therefore, bromine's melting point is below 25°C. However, since bromine has not transitioned into a gaseous state at 25°C, it indicates that its temperature is still below its boiling point. This suggests that the boiling point of bromine lies above 25°C.
The relatively narrow temperature range between its melting and boiling points makes bromine unique among elements and allows it to exist as a liquid at room temperature.
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Which of the following is the smallest?
A) salt grains
B) water molecule
C) human red blood cells
D) C. Difficile Bactria
Answer:
it's either a or b not c or d. there you go hope I helped
Explanation:
salt grains are very small, just like water molecule. so yea, hope I helped you out whoever you are.
what is the mean of 35, 2, 33,25 70,75 40,42,12,15,7,44,20,25,3,65,62,
31 answer
trust me
what is the mean of 35, 2, 33,25 70,75 40,42,12,15,7,44,20,25,3,65,62,
its 31
Phosphorus (P, #15) atoms bond with Chlorine (Cl, #17) atoms. What type of bond will hold them together? (1 pt)
*
1 point
ionic
covalent
metal
intermolecular (hydrogen, dipole, etc.)
Complete the model of a sodium chloride crystal by dragging the chlorine and sodium atoms to their correct positions.
The model is completed by inserting the sodium and the chloride ions in alternate positions.
What is a model?It is common to show the arrangement of atoms or ions in a substance by the use of models. In the realm of science, a model could be used for the purpose of explanation or for the purpose of prediction. It is also possible to use a model as the way that we can be able to underscore and understudy the properties of a molecule.
Now we know that sodium chloride is an ionic compound. The ionic compounds are crystalline. This implies that the ions are arranged in a regular and a repeating pattern which enables the substance to have a definite shape as well as a high melting and a high melting point.
It then follows from the image that the ions of sodium and chlorine do occupy alternate positions in the solid in order to maximize the interaction between the ions. It then follows that the model is completed by inserting the sodium and the chloride ions in alternate positions.
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when two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a
They can be joined through a Peptide bond
The amino acids serve as the foundation for proteins. Water is produced when the amino acids are linked to form a lengthy chain of acids via amino and carboxyl. The main protein is made up of these long chain amino acids.
When the carboxyl group of one molecule combines with the amino group of the other molecule, a molecule of water is released, and a peptide bond is created between the two molecules (H2O). This condensation event, sometimes referred to as a dehydration synthesis reaction, typically takes place between amino acids.
What is a Peptide bond ?The carboxyl group of one amino acid is joined to the amino group of another to produce a peptide bond, also known as a eupeptide bond. In essence, a peptide link is an amide-type covalent chemical bond.
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you made ml of a lead(ii) nitrate solution for lab but forgot to cap it. the next lab session you noticed that there was only ml left (the rest had evaporated). in addition, you forgot the initial concentration of the solution. you decide to take ml of the solution and add an excess of a concentrated sodium chloride solution. you obtain a solid with a mass of g. what was the concentration of the original lead(ii) nitrate solution?
4.83 M is the concentration of the original lead.
DILUTED and CONCENTRATED SOLUTIONS:
A solution is diluted when more solvent is added so that the concentration is lowered, whereas a solution is concentrated when solvent is removed from the solution so that the concentration increases. The removal of solvent can be done by evaporation. Both these processes involve the a change in the volume of the solution to cause a change in the concentration of the solution. This means that the same tools can be used to determine the concentration of a concentrated solution as would be done if it was a diluted solution.
The balanced reaction equation is:
[tex]Pb(NO_3)_2 (aq) + 2NaCl(aq) \rightarrow PbCl_2(s) + 2NaNO_3(aq)[/tex]
The molar mass of lead (II) chloride is 278.106 g/mol. The number of moles of lead(II) chloride is:
[tex]n = \frac{3.451 g}{278.106g/mol}[/tex]
[tex]n = 0.01241 mol[/tex]
The ratio between lead (II) chloride and lead (II) nitrate is 1:1 which means there was 0.0124mol of lead (II) nitrate in the solution. The concentration of lead (II) nitrate is:
[tex]M = \frac{0.01241 mol}{0.00200 L}[/tex]
[tex]M = 6.20mol/L[/tex]
This means the concentration of lead (II) nitrate in the partially evaporated solution is 6.20mol/L. The concentration of the original solution is:
[tex]M_1 V_1 = M_2 V_2[/tex]
[tex]M_1 = \frac{M_2 V_2}{V_1}[/tex]
[tex]M_1 = \frac{(6.20 M)(0.0779 L)}{0.1000 L}[/tex]
[tex]M_1 = 4.83 M[/tex]
Thus, the concentration of the original lead is 4.83 M.
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How many bonds are broken in the balanced reaction of the combustion of nitric oxide.
Answer:3
Explanation:
In the balanced reaction of the combustion of nitric oxide (NO), two bonds are broken.
Nitric oxide (NO) is composed of a nitrogen atom bonded to an oxygen atom. During combustion, NO reacts with oxygen (O2) to form nitrogen dioxide (NO2). The balanced chemical equation for this reaction is:
2 NO + O₂ → 2 NO₂
In this reaction, there are two molecules of nitric oxide (NO) on the left-hand side of the equation. Each nitric oxide molecule has one nitrogen-oxygen bond, so there are a total of two bonds in the reactants.
On the right-hand side of the equation, there are two molecules of nitrogen dioxide (NO2). Each nitrogen dioxide molecule has two nitrogen-oxygen bonds, so there are a total of four bonds in the products.
To balance the equation, two nitric oxide molecules are needed to produce four nitrogen dioxide molecules. This means that during the reaction, two nitrogen-oxygen bonds are broken in the reactants, and four new nitrogen-oxygen bonds are formed in the products.
In summary, in the balanced reaction of the combustion of nitric oxide, two bonds are broken.
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an aqueous solution containing 17.5 g of an unknown molecular solute (a nonelectrolyte) in 100.0 g of water has a freezing point of −1.80 °c. what is the molar mass of the unknown compound? kf(water)
The nonelectrolyte is a substance that has been known to not ionize in an aqueous solution. The molar mass of the unknown compound at the freezing point of −1.80 ° C is 180.833 g/mol.
What is the freezing point?The freezing point has been the estimate of the temperature at which the substance is said to change its phase from the liquid to the solid state. It is just the opposite of the melting point.
Given,
ΔTc = -1.8 °C
Kc water = 1.86 °C.Kg/mol
Mass solvent = 100.0 g = 0.1 Kg
Mass solute = 17.5 g
Mass of solution = mass of solute + mass of solvent = 117.5 gm
Molality (m) is calculated as:
molality = solute (mol) ÷ solvent (Kg)
m = ( - 1.8 °C) ÷ ( - 1.86 °C.Kg/mol)
m = 0.9677 mol/Kg
Molar mass can be calculated from molality as:
moles of solute = molality × solvent
moles = 0.9677 mol/Kg × 0.100 Kg H2O
= 0.09677 mol
Now, moles and mass are used to calculate molar mass as:
Molar mass = mass ÷ moles
= 17.5 g ÷ 0.09677 mol
= 180.833 g/mol
Therefore, the molar mass of the unknown substance is 180.833 g/mol.
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Jenny experiences an average downward force of 441 N anywhere she goes
The mass of the object could now be obtained as 45 Kg.
What is gravity?We define the term gravity as the force that drags an object down to the center of the earth. We know that every object that is found on earth has a mass. The mass of the object means that it is acted upon by the force of gravity.
Again we can obtain the weight of the object as the influence of the gravitational force on an object. In fact we define the weight of the object as the gravitational force that acts on an object. As such, the gravitational force or the weight of the object is given in Newton’s.
Given that;
Weight = mass * acceleration due to gravity
Mass = Weight/ acceleration due to gravity
Weight of the object = 441N
Acceleration due to gravity = 9.8 m/s^2
Mass of the object = 441N/9.8 m/s^2
= 45 Kg
The mass of the object could now be obtained as 45 Kg.
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comparison of methods for spectral alignment and signal modelling of gaba‐edited mr spectroscopy data
Comparison of techniques for GABA-edited MR spectroscopy data spectral alignment and signal modeling.
There are many ways to align and quantify magnetic resonance spectroscopy (MRS) data in order to assess -aminobutyric acid in vivo (GABA). Because there are few ground-truth measurements available, there is little research comparing the performance of different approaches. In comparison to white matter, the concentration of GABA is almost twice as high in grey matter.
Here, we assess the performance of four spectral alignment approaches (i.e., retrospective frequency and phase drift correction) and six GABA signal modeling methods using the percentage of grey matter present in the MRS voxel as a proxy for ground-truth GABA concentration.
The alignment to the creatine (Cr) signal generates GABA+ estimates that account for around twice as much of the diversity in grey matter as the next highest performing alignment approach, according to our analysis of a broad dataset of 432 MEGA-PRESS scans targeting several brain areas.
Additionally, Cr alignment produced the fewest outliers and was the strongest. As opposed to this, all signal modeling techniques—aside from the single-Lorentzian model—performed equally well.
Our findings indicate that rather than frequency originating from first-order phase offsets within subspectra, performance variability is predominantly caused by variances in the zero-order phase calculated by each alignment method.
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The weather news gives the atmospheric pressure as 1.07 atm. What is this atmospheric pressure in mm Hg?
813.2 torr was computed as the value.
Air pressure is the force of the air around us, whereas atmospheric pressure is the force of the earth's atmosphere. Tore gauges are used to measure air pressure, while mercury barometers are used to measure atmospheric pressure. The planet's gravitational pull on the gases above its surface produces atmospheric pressure, which depends on the planet's mass, the radius of its surface, the quantity, composition, and vertical distribution of the gases in the atmosphere.
Factor of conversion: 760 Torr per atm
Torr = 1.07 Atm 760
Torr = 813.2
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Mrs. Richardson performed an experiment on how the type of music affected plant growth. She sets up an experiment playing rock music, jazz music, country music, and rap music to fern plants. She also has a fern plant that she puts in a quiet room. She measures how tall the plants have grown after 4 weeks. They all received the same amount of water and light.
What is the dependent variable?
a
Rock, jazz, country, rap, and no music
b
Amount of water and light
c
Type of music
d
Plant growth
The dependent variable in this type of experiment is referred to as the Plant growth and is therefore denoted as option D.
What is Dependent variable?This refers to a type of variable whose value will change depending on the value of another variable which is referred to as the independent variable. It is also referred to the variable which is usually tested or measured when an experiment is done by scientists.
In this case, we were told that the plant were exposed to different criteria such as the music types and the constants such as light and water and the effect on the plant growth will be measured after sometime.
Since the parameter to be measured is the plant growth then it is referred to as the most appropriate choice for dependent variable.
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predict the paths taken by ???? particles that are fired at atoms with a rutherford atom model structure. explain why you expect the ???? particles to take these paths.
The positive-positive repulsion is expected to slow the particles down slightly as they travel through the atoms since the plum pudding model predicts that the positive charge is distributed evenly throughout the atom. However, we do not anticipate any deflection of the particles.
According to the idea, an atom has a tiny, compact, positively charged center called a nucleus, where almost all of the mass is concentrated, while light, negatively charged particles called electrons orbit far around it, much like planets orbit the Sun.To explain the scattering of alpha particles from thin gold foil as shown in a series of experiments carried out by undergraduate Ernest Marsden in 1909 under the guidance of Rutherford and German physicist Hans Geiger, the nucleus was hypothesized to be small and dense. A lead shield was placed over a radioactive source that was generating alpha particles, which are positively charged particles that are 7,000 times more massive than electrons and identical to the helium atom nucleus.The Rutherford model was not accepted.
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you have 3.8 kg of water. one mole of water has a mass of 18 g/mole and each molecule of water contains 10 electrons since water is h2 o. what is the total electron charge contained in this volume of water? the elementary charge is 1.6 × 10−19 c . answer in units of c.
The total electron charge contained in this volume of water is 8.565 x 10⁷c.
Equation :N total = N mole (10e⁻ / molecule) Nₐ
Nₐ = 6.022 x 10²³ molecules / mole
N mole = mass / molecular weight
= Vp / mol wt
= (1.6 × 10⁻¹⁹ c) (10³ kg /m³) / 18 g / mole (10⁻³ kg/g)
= 88.89 moles
N total = N mole (10e⁻ / molecule) Nₐ
N total = 88.89 moles (10e⁻ / molecule) (6.022 x 10²³ molecules / mole)
N total = 5.353 x 10²⁶e⁻
Q total = N Total (-e)
Q total = (5.353 x 10²⁶) (1.6 × 10−19 c )
Q total = 8.565 x 10⁷c
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while water is boiling, it absorbs 2257 kj of heat per kilogram of water. this takes place at a constant temperature of 100°c. what is the entropy change of 10 kg of water while it boils? (be careful of your energy units). (1 point)
The entropy change is 6.051 x 10^4 J/K
Given:
mass of water = 10 kg
latent heat of boiling = 2257 kj
constant temperature = 100°c
To Find:
entropy change of 10 kg of water
Solution:
entropy change = mass*latent heat of boiling/temperature
= 10×2257×1000/(273+100) K
= 22,570,000/373K = 6.051 x 10^4 J/K
Hence, entropy change is 6.051 x 10^4 J/K
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in the titration of 230.0 ml of 0.4000 m honh₂ with 0.2000 m hbr, how many ml of hbr are required to reach the halfway point?
Titration has been the process to estimate the unknown volume by the known amount of the concentration and volume. 230 mL of HBr is required to reach the halfway point.
What is the dilution formula?The dilution formula can be used to estimate the unknown volume through the half-neutralization of the acid and base in the titration process. The final volume can be estimated by the known amount of HONH₂.
The formula is given as:
M₁V₁ = M₂V₂
Given,
Volume of HONH₂ (V₁) = 230 mL
Molar concentration of HONH₂ (M₁) = 0.4000 M = 0.2000 M
Molar concentration of HBr (M₂) = 0.2000 M
Volum of HBr = V₂
Substituting values as:
230 ml × 0.2000 M = 0.2000 M × V₂
V₂ = 230 mL
Therefore, 230 mL HBr is the volume at halfway point.
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