We intend to prepare 500 ml of a 0.1m solution of NaCl, but you forget to remove the stir bar when we bring the solution to volume. the stir bar has a volume of 1 ml and weighs 4 g, the percent error in our molarity is 0.2%.
What is percent error?Percent errors indicate how big our errors are when we measure something in analysis process. Smaller percent errors indicate that we are close to accepted or original value.
For example, a 1% error indicates that we got very close to accepted value, while 48% means that we were quite a long way off from the true value. Measurement errors are often unavoidable due to certain reasons like hands can shake, material can be imprecise, or our instruments just might not have capability to estimate exactly.
The percent error formula will let us know how seriously these inevitable errors influenced our results.
Percent error is difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In other words, the percent error is relative error multiplied by 100.
The percent error formula
Formula for percent error is:
PE = (Estimated value-Actual value|/ The Actual value) × 100
0.1% M NaCl
Amount of NaCl require to prepare 0.1M NaCl calculated:
M1= [tex]\frac{1000*x}{58.5*500}[/tex]
x= 2.95g
but stir bar consume 1ml so actual value of solution is not 500ml but it is 500-1= 499ml
so, molarity= [tex]\frac{1000*2.925}{58.5*499}[/tex]
M2= 0.1002M
%error= [(M1-M2)/M1]*100
=0.2%
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a chemist needs to know the mass of a sample of caco3 to 2 significant digits. he puts the sample on a digital scale. this is what the scale shows: 0 0 0 2 4 . 0 g if this measurement is precise enough for the chemist, round it to 2 significant digits.
The mass of the CaCo3 to 2 significant numbers = 24 g
In any type of scientific dimension, the perfection of the dimension is represented in the significant integers of that dimension. It also used to show the dimension to the necessary degree of delicacy.
Significant integers comprises every number except the leading zero( s). And if the number after the needed significant integers isn't over to 5, it's rounded down and the needed significant integers is written as is. But if the number after the needed significant integers is at least 5, it rounded up, and the last number on the significant integers demand is increased by a factor of 1.
Exemplifications include :
0.3547 = 0.355 to 3s.f(0.0007 is rounded up to increase the coming number, 4, by a factor of 1)
Hence, the answer would be 24 g
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How many atoms are there in 2.68 grams of aluminum (Al)?
A)28.8 x 1023 atoms
B)5.98 x 1022 atoms
C)2.86 atoms
D)0.099 atoms
does baking soda make cake rise
Answer: Yes it can help make cake rise.
Explanation: Its a leavening agent and its a good ingredient for baking.
How many protons, neutrons, and electrons are there?
Answer:
proton-27
electron-25
neutron-35
Explanation:
what can be said of a compound whose liquid has a freezing point of 82°c? what can be said of a compound whose liquid has a freezing point of 82°c? the solid sublimes at 41°c the liquid has a boiling point of 164°c the solid has a melting point of 82°c the solid has a melting point of 41°c
A compound whose liquid has a freezing point of 82 deg C , the compound that is the solid is said to be have the melting point (MP) of 82 deg C.
The answer is 82 deg C because freezing of any liquid is an equilibrium process.
It is equilibrium process because at 0 deg C , the number of H2O molecules becoming ice is equal to the H2O molecules as ice melting from to form a liquid water.
The rate of freezing water is equal to the rate of melting of ice.
Thus, there is an equilibrium between solid and liquid water.
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What is the concentration of chloride ions in a 0.349 m solution of sodium chloride?
. Formic acid is a weak acid found in insect stings. It partially dissociates in water according to the reaction HCHO2 reversible reaction arrow CHO2– + H+. The equilibrium constant describing the dissociation is Ka = . (6 points)
i. If a solution of formic acid contains 0.2 M HCHO2, 0.006 M CHO2–, and 0.006 M H+, what is the Ka of the acid? (4 points)
ii. What is the pH of the solution at the concentrations given? (4 points)
iii. What would happen to the equilibrium position if more CHO2– were added to the solution? (4 points)
From the data in the question, we obtain the following;
Ka = 1.8 * 10^-4 pH = 2.22If more [tex]CHO_{2} ^-[/tex] were added to the solution, the equilibrium position would shift to the left hand side.What is the Ka?The term Ka is the acid dissociation constant. It shows the extent to which an acid is dissociated in solution. We know that the acids that dissociate completely in solution are called strong acids.
In this case;
[tex]HCHO_{2}[/tex](aq) ⇔ [tex]CHO_{2} ^-[/tex](aq) + [tex]H^+[/tex](aq)
Hence;
[[tex]HCHO_{2}[/tex]] = 0.2 M
[[tex]CHO_{2} ^-[/tex]] = 0.006 M
[ [tex]H^+[/tex]] = 0.006 M
Ka = [ [tex]H^+[/tex]] * [[tex]CHO_{2} ^-[/tex]]/[[tex]HCHO_{2}[/tex]]
Ka = (0.006)^2/(0.2)
Ka = 1.8 * 10^-4
The pH of the solution = -log(0.006) = 2.22
If more [tex]CHO_{2} ^-[/tex] were added to the solution, the equilibrium position would shift to the left hand side.
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Which of the following pairs of atoms is unlikely to form a compound?
Responses
potassium (K) and iodine (I)
potassium (K) and iodine (I)
iron (Fe) and sulfur (S)
iron (Fe) and sulfur (S)
calcium (Ca) and chlorine (Cl)
calcium (Ca) and chlorine (Cl)
neon (Ne) and argon (Ar)
The pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar) (option D).
What are compounds?Compounds are substances that are formed by chemical bonding of two or more elements in definite proportions by mass.
Elements combine to form compounds by sharing, donating or gaining electrons. For example, metals donate electrons to nonmetals to form metallic or ionic bonds.
However, noble gases are elements that have a completely filled shells, hence, do not engage in chemical bonding. Examples of noble gases are argon, helium, neon etc.
Therefore, the pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar).
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In rutherford's famous experiment, he shot heavy, fast moving, positive alpha particles at a thin gold foil. based on thomson's plum pudding model of the atom, what did rutherford expect to happen, and why? all the alpha particles would be deflected by the foil because of the even distribution of mass and charge throughout the atom. all the alpha particles would pass straight through the foil because of the even distribution of mass and charge throughout the atom. most of the alpha particles would become embedded in the foil because they are attracted to the negative electrons in the atom. some of the alpha particles would be deflected and some would pass through, because of the negative charge of the electron cloud.
Based on Thomson's plum pudding model of the atom, what did Rutherford expect All the alpha particles would pass straight through the foil because of the even distribution of mass and charge throughout the atom.
What happened when Rutherford fired alpha particles at gold foil?Alpha particles, which have a positive charge, were fired at a piece of gold foil. The vast majority of alpha particles passed right through. This demonstrated that the gold atoms were primarily empty space.The gold foil experiment by Rutherford demonstrated that the atom is mostly empty space with a tiny, dense, positively charged nucleus. Rutherford proposed the nuclear model of the atom based on these findings.With his gold-foil experiment, physicist Ernest Rutherford established the nuclear theory of the atom. When he fired an alpha particle beam at a sheet of gold foil, some of the particles were deflected. He concluded that the deflections were caused by a tiny, dense nucleus.The nucleus of an atom is very small. There is a lot of empty space surrounding the nucleus. The nucleus is a very small positively charged region that contains the entire mass of an atom. Electrons are dispersed in the empty space surrounding the nucleus.
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Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much.
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice the mass.
Mass is the amount of matter present in the particle.
it is expressed in kg.
weight is the force acting on the particle due to the gravity of the earth.
It is expressed in newton N.
let in 1 kg block the mass present is x.
so in a 2 kg block, the mass will be 2x.
we can say that mass becomes twice.
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decigrams
centimeters =
The conversion of decigrams into centigrams would not be possible as these are two different quantities.
here the decigrams is used to measure the mass of the substance and centimeters are used to measure the length of the substance.The decigrams are used in laboratory used in measuring of precise laboratory experiments.It is used to measure the very small weight and the weight is 1/10 of grams.Decagram used in matrix system.For example the tea contain 1 decigram of caffeine that means 100 mg of caffeine so its is difficult for us to calculate the small value , so we measured the mass of caffeine into higher value that is kilogram.So the amount of caffeine is 0.000 1 kilograms.using decigram for measuring the quantity is bit difficult.While centigrams are used to measure the length , breadth, and height of the product.Hence two different quantities cannot be converted and there is no relationship between them.
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Cylinder containing 22ml. The mercury used to fill the cylinder weighs 308 g. from this information, calculate the density of mercury
The density of the mercury is 14 gm/ml.
Given,
Volume of cylinder = 22 ml
Mass of mercury in the cylinder = 308 g
We have to find the density of the mercury.
The density of any substance is defined as the mass per unit volume of the substance. Or, it is the ratio of mass to volume. The units of density are kg/m³, g/ml, or g/cm³. Each substance has its own density. It is the mass of an object compared with its volume.
It is given by the formula:
Density = Mass/ volume
Density = 308 gm/ 22 ml
Density = 14 gm/ml
Hence, the density of mercury is 14 gm/ml.
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help!! 30 points! will give brainlist!
Answer:
Acid base acid base
Explanation:
6. A(n) is a material made of two or more metals.
O molecular compound
O alloy
ionic compound
O mineral
Answer:
alloy
Explanation:
an alloy is formed when two metals are chemically combined together to form a compound
The functional group of the amino acid histidine has a pka of approximately 6. 0. What would you expect would be true of a histidine residue in an enzyme in a solution with ph 4. 0?.
The histidine residue would be protonated in a solution with pH 4.0.
pKa value illustrates the pH value at which the protonated and deprotonated forms of the weak acid are in a 1:1 ratio. This means that at pH values below pKa (more acidic, because pH is a negative logarithm of the H+ ion concentration), the dominant form of the histidine residue is the protonated one. On the other hand, at pH values higher than 6.0 (more basic), the deprotonated form is the dominant one.
Because 6 - 4 = 2, this means that the concentration of the protonated form is 100 times higher than the concentration of the deprotonated one.
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Relative to other substances, water tends to resist changes in temperature. Why?.
Relative to the other substances, water tends to resist changes in temperature because water is highly cohesive.
Molecules of water tends to resist increases in their motion. When water is heated, some of the energy is used to disturb the hydrogen bonds between the neighboring molecules. Bond between two water molecules is the hydrogen bond.
The tendency of water molecules to stay close to each other is due to the strong hydrogen bonding between the atoms. This strong hydrogen bond causes water to resist motion of molecules and remain at room temperature.
Specific heat of water is really high due to which water resist the temperature change. A lot of heat is required to move the water slightly and resist the temperature changes. Heat gets absorbed when the hydrogen bonds break.
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A chemistry student is investigating how particle size
affects the rate of dissolving. In her experiment, she
adds a sugar cube, sugar crystals, or crushed sugar to
each of three beakers of water, stirs the mixtures for
10 seconds, and records how long it takes the sugar to
dissolve in each beaker.
A solute in a gaseous, liquid, or solid phase dissolves in a solvent to create a solution through the process of dissolution.
what is dissolution?A solute in a gaseous, liquid, or solid phase dissolves in a solvent to create a solution through the process of dissolution.Dissolving can be demonstrated by stirring sugar into water. The solvent is water, and the solute is sugar. An illustration of the dissolution of an ionic chemical is the dissolving of salt in water. When combined with water, sodium chloride (salt) separates into sodium and chloride ions.Small particles have a higher interfacial solubility because the disjoining pressure of small particles is higher than that of large particles. Small particles dissolve more quickly because of their higher differential concentration, thinner diffusion layer, and larger surface area. So crushed sugar dissolve more quickly.To learn more about : dissolution
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Which statement best describes a scatterplot?
A. it shows data as a percentage of a whole
B. it shows data points connected by a single line
C. it shows quantitative data that relate two variables
D. it shows qualitative data grouped by similarities
The statement that best describes a scatterplot is as follows: it shows quantitative data that relate two variables (option C).
What is a scatter plot?A scatter plot is a graphical representation of data that showcases the relationship between two different variables.
A scatter plot is usually plotted or displayed on a cartesian plane made up of two axes. The X-axis runs form left to right and usually shows the range of values of an independent variable.
The y-axis runs from top to bottom and usually shows the range of values of variable dependent on one other variable.
Therefore, it can be said that a scatter plot can best be described as one that shows quantitative data that relate two variables.
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Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much.
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice the mass.
mass is the amount of matter present in a particle.
unit of mass is kg.
weight is the force acting on the particle due to the gravity of the earth.
unit of weight is N.
let 1 kg block has mass x
then 2 kg block will have 2x mass
we can say that it has twice mass.
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice mass
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a 6.57-g sample of niso4•6h2o (molar mass 262.84) is dissolved in enough water to make 50.00 ml of a green solution, and 7.15 g of na2co3•10h2o (molar mass 286.14) is dissolved in enough water to make 50.00 ml of a colorless solution. the two solutions are mixed, and a green precipitate forms. the resulting slurry is divided into two equal portions. to one portion is added an excess of 6 m hcl, which results in the disappearance of the precipitate and a rapid evolution of a gas. to the second portion is added a few milliliters of 6 m nh3. the precipitate dissolves, and a blue solution forms.
When the solution are mixed together, the gas that evolved must be Carbon dioxide.
There are two reactions:
When nickel sulphate reacts with sodium sulphate which gives nickel carbonate with sodium sulphate.
1) NiSO₄ (aq) + Na₂SO₄ (aq) = NiCO₃ (s) + Na₂SO₄
The resultant is a green solid.
When the resulting slurry i.e. the nickel carbonate reacts with hydrochloride, gives nickel chloride, carbon dioxide and water, and also the disappearance of the precipitate.
2) NiCO₃ (s) + 2 HCl (aq) = NiCl₂ + CO₂ + H₂O
When the evolved gas is added to NH₃ solution it dissolves the precipitate and forms a blue solution which gives the confirmation that the gas so evolved is carbon-di-oxide.
The given question was incomplete, complete question is:
"A class is given a demonstration of solution chemistry and solubility equilibria.Passage: A 6.57-g sample of NiSO₄•6H₂O (molar mass 262.84) is dissolved in enough water to make 50.00 mL of a green solution, and 7.15 g of Na₂CO₃•10H₂O (molar mass 286.14) is dissolved in enough water to make 50.00 mL of a colorless solution. The two solutions are mixed, and a green precipitate forms. The resulting slurry is divided into two equal portions. To one portion is added an excess of 6 M HCl, which results in the disappearance of the precipitate and a rapid evolution of a gas. To the second portion is added a few milliliters of 6 M NH₃. The precipitate dissolves, and a blue solution forms.Question: According to the information in the passage, the gas that evolves is:
A) sulfur dioxide. B) sulfur trioxide.
C) carbon dioxide. D) carbon monoxide".
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How many moles of calcium ions, nitrate ions, and oxygen atoms are present in 0.502 mol of calcium nitrate? calcium ions 66.3 incorrect: your answer is incorrect. mol nitrate ions mol oxygen atoms mol
No. of moles present in 0.502 mol of calcium nitrate
Calcium ions = 0.502 mol,
nitrate ions= 1.004 mol,
oxygen atoms =3.012 mol.
What is calcium nitrate?The chemical composition Ca(NO3)2(H2O)x is calcium nitrate, an inorganic substance. Rarely occurring anhydrous chemical converts to tetrahydrate by absorbing moisture from the atmosphere. Colorless salts can exist in both anhydrous and hydrated forms.
Although there are additional uses for calcium nitrate, it is most frequently employed as a component in fertilizers. When manure hits concrete or limestone in a dry environment, such as a stable or cavern, nitrocalcite, a mineral that is hydrated calcium nitrate, forms as an efflorescence.
The related compounds calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate are just two examples.
Calcium nitrate Ca(NO3)2 = 0.502 mol
Required equation of the given question is below:
Ca(NO3)2 —-> 2N03- + Ca2+
Which contains 2 nitrate ions per mole of Ca(NO3)2.,
1 calcium ion per mole of Ca(NO3)2.,
6 oxygen atoms per mole of Ca(NO3)2.
Calcium ions therefore = 0.502 mol,
nitrate ions = 2 x 0.502 mol = 1.004 mol
oxygen atoms = 6 x 0.502 mol = 3.012 mol
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First person to answer these questions get Brainily!!!!
Please help with this questions. Please know plagiarism you guys. I really need help.
1. What are the effects of earths rotation?
2. If Earth did not rotate, what would be one major obstacle life would have to overcome?
3 Around what Earth revolve?
4. What are two way life would be different if Earth did not have the motion of revolution? If we did not have motion for revolution.
5. When Earth is closer to the sun, the Northern Hemisphere is in winter. Why is the true?
6. Given the effects of precession, will this still be the case in 13,000 years? Explain your answer.
Answer: 1 gravitational pull
2not all of the sun would hit the earth so half of the earth would live in darkness
Explanation:
Use the atomic mass of lithium to calculate the relative abundances of the two isotopes. express your answers using one decimal place. enter your answers separated by a comma.
The relative abundance of the isotopes is 2.3137.
How do we calculate relative abundances?
The relative abundance for a specific ion in the sample can be calculated by dividing the number of ions with a particular m / z m/z m/z ratio by the total number of ions detected.
Relative abundance = [tex]\frac{m}{z}[/tex]
The atomic masses of Li are 6.941amu.
The atomic number of Li is 3
Relative abundance = [tex]\frac{6.941}{3}[/tex]
Relative abundance = 2.3137
The relative abundance of the isotopes is 2.3137.
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The isotopes have a relative abundance of 2.3137.
What is relative abundance?A species' relative abundance is determined by how many of that species there are in relation to all the other organisms in the area. Among the most well-known and extensively researched patterns in macroecology, relative species abundances frequently follow certain patterns.
Relative abundance = m/z
The atomic masses of Li are 6.941amu.
The atomic number of Li is 3
Relative abundance = 6.941/3
Relative abundance = 2.3137
The isotopes have a relative abundance of 2.3137.
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Im confused HELPP PLEASE BRAINLY
These are what are supposed to go in the blanks:
yellow
red/orange
blue
purple
colorless
white
red/pink
red
Answer:
Explanation:
l bozo
Describe how these 15 electrons are arranged in a
arranged in a phosphorus atom.
Electronic arrangement of phosphorus is 2,8,5 and its electronic configuration is 1s2 2s2 2p6 3s2 3p3.
The element phosphorus belongs to group 5A of the periodic table and has 15 protons. It is a highly reactive non-metal. It is typically found as ionic compounds in nature where it has reacted with metals.We must first examine the phosphorus Bohr diagram in order to identify the electron arrangement.The number of electrons in each energy level is written down, with commas used to separate the values, to represent the electron arrangement. Moving outward, we start at the first energy level that is closest to the nucleus.As we can see, the first energy level has two electrons, the second contains eight, and the third contains five.The electron arrangement would be 2, 8, 5.
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A cake is made by mixing ingredients and placing the material in an oven for baking. What type of reaction is involved?.
What does pH measure? What 2 ions are equal in a neutral pH of 7?
Answer:
Basically it measures the acidity or alkalinity of a substance.
when do you use the roman numerals when naming ionic compounds
Oxidation State
In chemistry, when naming ionic compounds there will sometimes be a roman numeral after the first element. This number represents the oxidation state of the element. An oxidation state is defined as the hypothetical charge of an atom, assuming that all of its bonds are fully ionic. In other words, the oxidation state shows how many electrons an atom gives or receives after ionization.
In ionic compounds, there will only ever be a roman numeral after the first element. This element will always be the cation (positively charged ion). So, the roman numeral will show how many electrons each cation gave.
When Roman Numerals are Necessary
This is necessary when you deal with transition metals or any other element that has multiple oxidation states. For example, iron can give 2 or 3 electrons. So, when naming a compound with iron you need to use a (II) or (III) to show how many electrons each iron atom gave.
When Roman Numerals are Unnecessary
On the other hand, roman numerals are unnecessary when using an element that only has one possible oxidation state. For example, Na can only give 1 electron ever, so it does not need a roman numeral. Additionally, elements in the second group like Mg can only ever give 2 electrons, so they also don't need a roman numeral to follow their name.
suppose you sketch a model of an atom using the ones here as a guide. how would you build a model that is ionized? how would you build a model that is
An atom is mainly constructed of a total of three different particles known as electrons, protons and neutrons.
An atom is neutrally charged because the charge/number of the electrons (negative charge) is equal to the charge/number that the proton carries (positive charge). these charges cancel out each other making the atom neutrally charged.
Model of an ionized atomAn ionized atom is called as the one which has some net charge present on it. This charge on it can be either a positive charge or a negative charge.
Model of radioactive atomA radioactive atom is an atom that is an unstable atom and has access of energy in its center. This radio activeness can be caused by adding either neutrons or protons.
To Model a radioactive atom, increase the number neutron or proton present in the nucleus.
Hence, through this we can conclude that to model an ionized atom is done by adding or removing electron(s) from the atom while to model a radioactive atom we add additional Neutron or proton to the nucleus.
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One limatation to science is that it cannot answer questions about________
One limitation to science is that it cannot answer questions about morality.
What are science limitations?Science is defined as the systematic study of a structure through careful experiment and observations.
However, there are limitations that are encountered in the field of science which include the questions that science cannot answer.
Some of the limitations of science include the following:
Questions about value.Questions of morality.Questions about the supernatural.Questions concerning ultimate reality.Science cannot answer the question of morality because it doesn't have a link of how man makes his judgement through his consciousness and how ethics, scope of cultural, religious and social influences affects his decisions.
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