Answer:
30
Explanation:
Density = mass over volume
1.35 = m ÷ 22
isolate m
1.35 × 22 = 29.7
2 sig figs
so,
30 grams
The mass of the given gas sample at STP is 28 grams.
What is the relation between the mass and density of a solid body?
The relation between the mass and density of any substance is given by -
M = ρV
Where -
M - mass of body
ρ - density of body
V - volume of body
Given is volume of a gas sample is 22 L at STP. The density of the gas is 1.35 g/L.
We can write -
Volume of gas = [V] = 22 L
density of gas = [D] = 1.3 g/L
Therefore, the mass of the gas will be -
M = ρV
M = 1.3 x 22
M = 28.6 g
Therefore, the mass of the given gas sample at STP is 28 grams.
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25 cm³ of 0.1 mol/dm³ hydrochloric acid exactly neutralise 20 cm³ of aqueous sodium hydroxide.
The equation for this reaction is:
NaOH + HCI →→ NaCl + H₂O
What is the concentration of the sodium hydroxide solution?
The concept molarity is an important method which is used to calculate the concentration of a solution. Here molarity - volume relation is used to find out the concentration of the sodium hydroxide solution.
The term molarity is defined as the number of moles of the solute present per lite of the solution. It is represented as 'M' and it is expressed in the unit mol / L.
The equation connecting molarity and volume is:
M₁V₁ = M₂V₂
M₂ = M₁V₁ / V₂
0.1 × 25 / 20 = 0.125 cm³
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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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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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If you were to do a 50% serial dilution, starting with a 10% concentration, how many dilutions would you have to make before getting to 2. 5% as your final concentration?.
The number of dilutions required to reach 2.5% as the final concentration would be 2.
Any dilution in which the concentration is reduced by the same amount in each subsequent stage is referred to as a serial dilution.
In serial dilutions, the original volume divided by the final amount is known as the dilution factor.
[tex]DF = \frac{V_i}{V_f}[/tex]
Now we are given that we must do 50% serial dilution, which indicates that the concentration must be reduced to half of its starting value after each dilution.
∴ [tex]DF=\frac{10}{50}[/tex] × [tex]100[/tex]
DF = 2
This indicates that starting with a 10% concentration, a single dilution would result in a 5% concentration. And again diluting this 5% concentration would result in a 2.5% concentration.
Hence, the number of dilutions required to reach 2.5% as the final concentration would be 2.
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atoms contain a combination of protons, neutrons, and electrons which gives an atom its properties and makes it possible to predict their reactivity, including which ion(s) will form from that element. of protons, neutrons, and electrons, which one(s) are found in the nucleus and which one(s) are found outside the nucleus
Due to electron shielding, which occurs when more electrons are introduced at the same energy level as the outermost electron, this is the case.
It is feasible to anticipate an atom’s reactivity, including which ion(s) will form from that element, thanks to the protons, neutrons, and electrons that give an atom its unique features.
What is the name for the particle formation of protons and neutrons?Since they are found in the atom’s nucleus, protons and neutrons are referred to as nucleons jointly.
How do protons, neutrons, and electrons affect an atom’s characteristics?The mass number of the chemical element will be determined in part by the number of protons and neutrons. The quantity of electrons present will depend on the number of protons.
The chemical will be determined by this electron.
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describe the main factors that led to a boom in the human population size in the last 300 years
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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help!! 30 points! will give brainlist!
Answer:
Acid base acid base
Explanation:
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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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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What is the mole for 3.01*10 23 molecules h2o?
Answer:
8.99 g
Explanation:
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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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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. 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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guess what!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Your friend got a life or its a happy moment for you
Explanation:
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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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.
8. Blood circulation in warm-blooded
animals is an example of ___
Answer:
dogs, lions, cats, and raccoons.
How would you describe the bond that exists between two oxygen atoms to make the o2 molecule? how many lone pairs are present on each individual oxygen atom?.
The bond that exists between two oxygen atoms to make the O2 molecule is described as two covalent bonds and two lone pairs of electrons are present on each individual oxygen atom.
A double bond in chemistry is a covalent bond between two atoms that involves four bonding electrons, rather than two as in a single bond.
In the oxygen molecule, O2, the oxygen atoms that make up the molecule are bonded together by sharing two pairs of electrons. Each oxygen atom has 6 valence electrons, if they share two of their valence electrons with each other, they each have 8 valence electrons.
In this way, the so-called octet rule is fulfilled, where atoms gain, lose or share electrons with other atoms to have 8 valence electrons and thus acquire a noble gas configuration.
What is an atom?The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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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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A cake is made by mixing ingredients and placing the material in an oven for baking. What type of reaction is involved?.
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:
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
PLS HELP IVE BEEN STUCK ON THIS FOR SO LONG
v
the student determines the mass of the agcl precipitate to be 5.48 g. on the basis of this information, calculate each of the following. (i) the number of moles of mgcl2 in the original mixture (ii) the percent by mass of mgcl2 in the original mixture
What is Gravimetric analysis?
Gravimetric analysis difficulties are basically stoichiometry problems with a few extra stages. It is a class of lab techniques to determine the concentration of a solution by measuring the mass of a precipitate formed. To find moles of solute use grams of precipitate and to find concentration divide by volume.
To calculate moles of precipitate:Moles = mass / molar mass
To calculate mass of analyte:mass moles × molar mass
To calculate percent by mass of analyte in sample:(mass analyte/ mass sample) × 100
Solution:
Given:
Mass of AgCl= 5.48 g
1) Molar mass of AgCl = 143.42 g/mol
Number of moles of AgCl = 5.48 g AgCl/143.32 AgCl = 0.0382 mol AgCl
Number of moles of MgCl₂ = 0.0382 mol AgCl × (1 mol Cl/1 mol AgCl )× (1 mol MgCl₂/2 mol Cl ) = 0.0191 mol MgCl₂
2) Mass of MgCl₂ = 0.0191 mol MgCl₂ × (95.20 g MgCl₂ / 1 mol MgCl₂)
=1.82 g MgCl₂
Percent by mass = ( 1.82 g MgCl₂/ 2.94 g sample) × 100% = 61.9% MgCl₂ by mass
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Something that causes an object to move
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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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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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
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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