The color of the solution after reaching a pH of 8 is pink.
In the process of titration of acetic acid with aqueous NaOH, phenolphthalein is used as an indicator. Phenolphthalein is nearly colorless in acidic solutions, but it turns the solution into pink at a pH of 8.
As you titrate vinegar, we can observe that the pink color is more persistent as we add more base. When a faint pink color persists for at least 30 seconds, we can understand that the endpoint has been reached.
The pH scale ranges between 0 - 14, if the pH is below 7 it indicates acidic, if it is exactly 7 then it indicates neutral and if it is greater than 7 it indicates a base.
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Hello pls solve question 10. Thank you.
10) A gas in the container with a volume of 204 mL contains 0.56 moles of gas. Gas is removed from the container so that it contains 0.26 moles. The new volume of gas in the milliliters is 94.7 mL.
According to the Avogadro's law, equal volumes of different gases contain equal number of molecules. It is shown by the mathematical formula
V₁/n₁=V₂/n₂
Where V₁=204 mL, n₁=0.56 mol, V₂=?, n₂=0.26 mol. Rearrange the formula for V₂
V₂=(V₁×n₂/n₁)
Plug all values in the formula and find V₂
V₂=(204 mL×0.26 mol/0.56 mol)
V₂=53.04 mL/0.56
V₂=94.7143 mL≈94.7 mL
Therefore, the new volume of gas is 94.7 mL.
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List some similarities and differences between an insect’s life cycle and a robber crab’s life cycle
The answers include the following:
The similarities between an insect’s life cycle and a robber crab’s life cycle is that they both have an exoskeleton that they shed as they grow and they hatch from eggs.The difference between them is that robber crabs don’t have a pupa stage while insects have.What is Life cycle?Thus is referred to as the series of changes and developments which occurs in an organism as it passes through from the beginning of its life until it dies.
Insect and robber crab’s life cycle are similar such that they both hatch from eggs and the difference is that insect has a pupa stage while the robber crab lacks it.
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Decomposition of hydrogen peroxide with mno2 equation
Hydrogen peroxide decomposes with MnO₂ to form water and oxygen gas.
The decomposition of hydrogen peroxide with MnO₂ is a chemical reaction in which hydrogen peroxide is decomposed into water and oxygen by the action of manganese dioxide. The chemical equation for peroxide and water is:
2H₂O₂ → 2H₂O + O₂
The mechanism and working of the above reaction are as follows:
1. Hydrogen peroxide (H₂O₂) reacts with manganese dioxide (MnO₂) to form Mn(OH)₂ and water (H₂O).
2. Mn(OH)₂ oxidizes to MnO₃, which then decomposes to MnO₂ and oxygen (O₂).
3. The oxygen gas produced in this reaction reacts with water to form hydrogen peroxide (H₂O₂), which completes the decomposition reaction.
The overall equation for the decomposition reaction is,
2H₂O₂ --> 2H₂O + O₂
The MnO₂ acts as a catalyst, meaning it speeds up the reaction without being used up in the process.
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Need help, HBr(aq)+CaOH(aq)—> need to find what salt it would form when strong acid/strong base reactions take place
The salt that we are going to get in this reaction is calcium bromide.
What is a neutralization reaction?The term neutralization has to do with the kind of reaction that occurs between an acid and a base. When an acid is known to react with a base, the products of the reaction are salt and water only.
Now we know that the reaction that occurs between hydrobromic acid and calcium hydroxide is a neutralization reaction and it is taking place between a strong acid and a strong base. The salt that is produced is calcium bromide.
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When a strong acid and a strong base such as HBr and [tex]Ca(OH)_2[/tex] react, the salt that would be produced is [tex]CaBr_2[/tex].
Acid-base reactionWhen an acid and a base react, salt and water are formed as the only product or part of the products. These kinds of reactions are otherwise known as neutralization reactions.
Strong acid and a strong base such as HBr and [tex]Ca(OH)_2[/tex] react accordingly to form salt and water according to the following equation:
[tex]2HBr + Ca(OH)_2 --- > CaBr_2 + 2H_2O[/tex]
In other words, when a strong acid and a strong base such as HBr and [tex]Ca(OH)_2[/tex] react, the salt formed is [tex]CaBr_2[/tex].
Neutralization reactions between a strong acid and a strong base always produce salts that are neutral.
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How much energy is required to lower the temperature of 32.45 grams of water by 4.05 oC?
According to the specific heat capacity, 37752.33 J of energy is required to lower temperature of water.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
It is calculated as, Q=32.45×4.2×277=37752.33 J.
Thus, 37752.33 J of energy is required to lower temperature of water.
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Propane gas plus oxygen gas produces
Answer:
Explanation:
As a result, the reaction of propane (C H) 3 8 and oxygen should produce carbon dioxide, water, and heat as products, and the balanced chemical equation will be: C H3 8 + 5O2 3CO2 + 4H O2 + heat. Reactants have the next highest potential power level when compared to materials.
Answer:
water and carbon dioxide
Explanation:
Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide.
I hope this helps!
Drag each label to the correct location on the chart. Classify the statements related to GMO as bias or fact
1. Tomatoes taste better when fish DNA is inserted into them.--- opinion
2. Genes from different species can be spliced into an organism to produce desired traits.--- fact
3. Cereal is more filling when cow DNA is inserted into it.--- opinion
4. Testing GMOs on rats and cockroaches is ethically wrong. --- opinion
5. The genes from GMO plants can spread to natural species if they successfully mate. --- fact
6. GMO crops can be designed to grow in environments where the natural species can’t grow.--- fact
What are GMOs?A GMO, or genetically change organism, is a plant, animal, microorganism, or another organism whose genetic rouge has been amended in a laboratory using genetic engineering or transgenic technology.
The United States Department of Agriculture considers GMOs to be plants or animals with heritable swaps introduced by genetic engineering or traditional methods, while GEO correctly refers to organisms with genes found, eliminated, or rearranged using molecular biology, particularly recombinant DNA.
So we can conclude that a genetically modified organism is any organism whose genetic matter has been altered using genetic engineering techniques.
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Drag each label to the correct location on the chart.
Classify the statements related to GMOs as bias or fact.
Tomatoes taste better when fish
DNA is inserted into them.
Genes from different species
can be spliced into an organism
to produce desired traits.
Cereal is more filling when a cow
DNA is inserted into it.
Testing GMOs on rats and
cockroaches is ethically wrong.
The genes from GMO plants
can spread to natural species
if they successfully mate.
GMO crops can be designed to
grow in environments where
the natural species can’t grow.
How many peaks are present in the 1h-nmr spectrum of Eugenol? Redraw the structure of Eugenol with all the hydrogens and indicate their splitting pattern on the 1h-nmr spectrum.
Number many peaks are present in the ¹H-nmr spectrum of Eugenol are having 12 different hydrogen atom.
The Eugenol has contain the 12 different hydrogen atoms. in the ¹H-nmr spectrum the peaks from right to left is 3:2:2:3:2. The three hydrogen atoms have two peaks of about the 6.7 pm. These hydrogen atoms are from the aromatic ring. the four hydrogen atoms have two peaks of around 6 pm. the one peak is from the hydrogen atom in the OH group. the vinylic hydrogen atoms are 3 they have one peak.
Thus, Number many peaks are present in the ¹H-nmr spectrum of Eugenol are having 12 different hydrogen atom.
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C3H8O2
empirical Or molecular
formula formula
Answer: i think its empirical
Explanation:
How many atoms of phosphorus are in 2.50 mol of copper(II) phosphate?
Explanation:
2.50 × 2/ 1
the answer is
5 moles
Do the benefits of using nuclear energy outweigh the risks?
Make a claim. Support your claim with evidence from the article. Then, explain why the evidence supports your claim.
Yes, the benefits of using nuclear energy outweigh the risks as nuclear energy has help to solve electricity issues in the United states and other countries.
Are there any advantages to using nuclear power?The benefits of nuclear energy is that it is one of the cleanest forms of energy. Its carbon footprint is also among the smallest. It is among the solutions to the energy gap. It is crucial to how we respond to greenhouse gas emissions and climate change.
Note that A clean energy source with no emissions is nuclear. It produces energy by fission, which is the splitting of uranium atoms to release energy. With no toxic byproducts created from fossil fuels, the heat from fission is used to create steam that powers a turbine and produces electricity.
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What is the empirical formula of Cl₂06?
The empirical formula for Cl₂O₆ is ClO₃.
The empirical formula of any chemical compound is the atoms ratio present in the formula to simplest whole number. it is the simplest formula of any chemical compound.
the given molecular formula is :
Cl₂O₆ : by dividing the both the subscripts to 2 , to get simplest whole number. we get :
empirical formula : ClO₃
The molecular formula is Cl₂O₆. the molecular formula of any chemical formula is the representation of atom in the chemical equation with subscript to indicate number of atoms in the molecule.
Thus, The empirical formula for Cl₂O₆ is ClO₃.
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This bohr model is showing what element
Why does atomic radius increase down a group (group 13)
Answer:
As we go down in groups in periodic table , number of shells increases than that in the previous group which tends to increase the size of atom eventually increasing the atomic radius.
Explanation:
For group 13:
Boron has 2 shells
Aluminum has 3 shells
Gallium has 4 shells
Indium has 5 shells and
Thallium has 6 shells.
Simple!
So the size goes on increasing down the group!
how can saltwater batteries work in real life?
Answer:
the answer is that you should prove it
If we know myofibrils are made of protein strands, what would expect to find a large number of in the myofibrils themselves.
A. Nucleic acids
B. Lipids
C. Sugars
D. Amino acids
An iron bar at 325k is placed into a sample of water. The iron bar gains energy if the temperature of the water is
The heat will transfer from one object to the other based on the temperature gradient. If the temperature of water is greater than that of the iron bar, the iron bar will gain energy .
What is heat transfer?The heat energy transfer from a hot body to a colder body and which can be interpreted based on the law of conservation of energy. There are three modes of heat transfer namly, conduction, convection and radiation.
Conduction is the energy transfer mode in solids, where the closely packed molecules will transfer heat to the neighbouring molecules in the chain. Convection is taking place in liquids and radiation is for gases.
When a metal of high temperature is dropped into water, the water temperature will rise since heat will transfer from the hot metal to the cold water. If the water has higher temperature than the metal, then the metal will gain energy.
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When 4.00 g of hydrogen nuclei fuse to form helium in the sun, 0.0265 g of matter is converted into energy. Using the mass converted to energy and the speed of light = 3.00x10^8 m/s and that a joule = kgꞏm^2/s^2, calculate how much energy is given off.
The amount of energy given off, given that 0.0265 g of matter is converted into energy is 11925×10⁸ Kgꞏm²/s²
How do I determine the energy given off?We'll begin by converting 0.0265 grams to kilograms. This can be obtained as follow
1000 grams = 1 Kilograms
Therefore,
0.0265 grams =(0.0265 grams × 1 Kilograms)/ 1000 grams
0.0265 grams = 0.0000265 Kilograms
Finally, we shall determine the energy given off. This can be obatianed as illustrated below
Mass (m) = 0.0000265 KilogramsSpeed of light (c) = 3×10⁸ m/sEnergy given off (E) =?E = ½mc²
E = ½ × 0.0000265 × (3×10⁸)²
E = 11925×10⁸ Kgꞏm²/s²
Thus, we can conclude from the calculation made above that the energy given off is 11925×10⁸ Kgꞏm²/s²
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A 10.00 g sample of a copper (II) sulfate hydrate (CuSO4 ∙ xH2O) was found to contain 6.39 g of copper (II) sulfate. Determine the complete formula for the hydrate (find x).
The value of x in the hydrated salt is 5.
What is the value of x?In this case, we are to obtain the value of the x that is found in the formula of the compound as we have it. We now have to make use of the formula that is written as;
Number of moles of hydrated salt = Number of moles of the anhydrous salt
Number of moles of hydrated salt = 10.00 /160 + 18x
Number of moles of anhydrous salt = 6.39/160
Then we apply the formula to have;
10.00 /160 + 18x = 6.39/160
10.00 /160 + 18x = 0.03994
0.03994(160 + 18x) = 10
6.39 + 0.719x = 10
x = 10 - 6.39/0.719
x = 5
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How many sodium atoms are
present in one formula unit of
sodium chromate?
1
4
7
2
The number of sodium atoms in a formula unit of the sodium chromate is 2.
How many sodium atoms are present?We know that the formula of a compound is the way that we can be able to know the atoms that we can find in the compound. The chemical formula shows the number of atoms of each of the elements that is present.
Now let us look at the formula unit of of sodium chromate as we have shown in the image that is attached to this answer. It shows us the number of the oxygen, sodium and the chromium atoms that we have in a formula unit of the sodium chromate.
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How many grams of zinc would react with 454 g( 1lb) of CuSO4(159.61 g/mol)
The mass of the zinc that is required is 184.6 g.
What is the mass of the zinc?We know that the term reaction has to do with the combination of two substances. Often times, we would have a new substances that is formed which is the product of the reaction.
Let us look at the reaction between zinc and copper II sulfate and that reaction is written as; [tex]Zn(s) + CuSO_{4} (aq) ------ > ZnSO_{4} (aq) + Cu(s)[/tex]
Number of moles of the copper sulfate = 454 g/159.61 g/mol
= 2.84 moles
Now, the reaction is 1:1 we can see;
Number of moles = mass/molar mass
Mass of Zn = 2.84 moles * 65 g/mol
= 184.6 g
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Name the intermolecular forces that exist between Br₂ and CCI4.
The intermolecular forces that exist between Br₂ and CCI₄ is dispersion force and London dispersion force
Intermolecular forces that arises between the positive components of one molecule and the negative components of another molecule and in the Br₂ there is London dispersion force because this is the diatomic element are nonpolar and nonpolar molecules are only capable temporary dipoles and the intermolecular forces between CCI₄ is the London dispersion force of attraction which is also known as induced dipole induced dipole and it is referred to as induced dipole because it is an attraction between temporary dipole in the structure
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which of the following states of matter are considered fluids
Answer:
the three states of matter are solid liquid and gas so the one that would also have fluids is liquid
What is the wavelength (in nm) of the photon absorbed for a transition of an electron from initial=1 that results in the least energetic spectral line in the
ultraviolet series of the H atom? Round your answer to 4 significant figures.
121.523 nm is the wavelength (in nm) of the photon absorbed for a transition of an electron.
[tex]n_1=1 ,n_2=2[/tex]
[tex]1/\lambda=1.09737 *10^7*1/1^2 *1/2^2=8230275m^-1[/tex]
[tex]\lambda=1/8230275[/tex]
1.215x10^-7 m=121.523 nm
since the dating between wave frequency and wavelength is inverse, gamma rays have extraordinarily tiny wavelengths that are best a small portion of the size of atoms, whereas different wavelengths can extend as a long way as the universe. No of the medium they are passing via, electromagnetic radiation's wavelengths are commonly expressed in phrases of the vacuum wavelength, but this isn't always said explicitly.
The wavelength of electromagnetic radiation influences how it behaves. speed of mild = wavelength x frequency power = Planck's consistent x frequency Wave wide variety = 1/wavelength in cm. The wavelengths of different elements of the electromagnetic spectrum are displayed collectively with a difficult approximation of the wavelength size.
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A sample of water contains .998 grams of hydrogen. How many grams of water is in the sample?
The mass of the water in the sample is equal to 8.982 grams.
What is reaction to the formation of water?The water molecule is formed by reacting hydrogen gas and oxygen gas. The chemical reaction of water formation is shown below.
[tex]2H_2 (g) +O_2(g) \longrightarrow 2H_2O(l)[/tex]
The balanced chemical equation can be described as an equation where the number of moles of each element on the reactant side is equal to the number of moles on the product side.
Given the mass of the hydrogen in the sample of water = 0.998 g
The molecular mass of water (H₂O) = 2 (1) + 16 = 18 g
It means 2g of hydrogen is present in the amount of water = 18 g
0.998 g of hydrogen will present in water = (18/2) ×0.998 = 8.982 g
Therefore, 8.982 grams of water is present in the sample.
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2. How does island biogeography decrease ecological tolerance?
An element X with relative atomic mass 210.2 has two isotopes 210x and 212x. What is the relative abundance of each of the isotope?
Considering the definition of atomic mass, isotopes and atomic mass of an element, the isotope 210-X has a percent natural abundance of 90% and the isotope 212-X has a percent natural abundance of 10%.
Definition of atomic massThe atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeIsotopes are called atoms of the same element, whose nuclei have the same number of protons but a different number of neutrons, and therefore differ in mass number.
Definition of atomic massThe atomic masses of chemical elements are calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Relative abundance of each of the isotopeIn this case, you know:
An element X with relative atomic mass 210.2The first isotope 210-X has an atomic mass of 210 amu and a percent natural abundance of x%. The second isotope 212-X has an atomic mass of 212 amu and a percent natural abundance of (100-x)%.Then, the average mass of X can be expressed as:
210 amu×x + 212 amu×(1 -x)= 210.2 amu
210 amu×x + 212 amu×1 -212 amu×x= 210.2 amu
210 amu×x + 212 amu -212 amu×x= 210.2 amu
210 amu×x -212 amu×x= 210.2 amu - 212 amu
(-2 amu)x= -1.8 amu
x= (-1.8 amu)÷ (-2 amu)
x= 0.9= 90%
Finally, the relative abundance of the isotopes is:
The isotope 210-X has a percent natural abundance of 90%. The isotope 212-X has a percent natural abundance of (100-90)%= 10%.Learn more about average atomic mass:
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You have 0.54 moles of NH3 and excess O3. How many moles of O3 are required?
The number of moles of O₃ required to react with 0.54 mole of NH₃ is 0.36 mole
How do I determine the mole of O₃ required?First, let us let us consider the balanced equation, to obtain usefull information as regarding the question.
6NH₃ + 4O₃ -> 3N₂O + 9H₂O
From the balanced equation above,
6 moles of NH₃ reacted with 4 moles of O₃
With the information obtained from the balanced equation, we can succefully determine the number of mole of O₃ required to react with 0.54 mole of NH₃. Details below
From the balanced equation above,
6 moles of NH₃ reacted with 4 moles of O₃
Therefore,
0.54 moles of NH₃ will react with = (0.54 × 4) / 6 = 0.36 mole of O₃
Therefore, we can conclude that the number of mole of O₃ required is 0.36 mole
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In the chemical equation CH4 + O2 -> CO2 + 2H2O for every one mole of carbon dioxide you produced, how many moles of water would you have?
Answer: 2 moles
Explanation:
In the balanced equation, it can be seen that everything reacts in a 1:1 mol ratio except water (H2O) as determined by the coefficient. It is simple stoichiometry, 1 mol CO2 * 2 mol H2O/1 mol CO2 = 2 mol CO2. After doing the math, the CO2 cancels out, leaving how many moles of H2O there are.
Which observation is clear evidence that matter is conserved in the chemical
reaction?
Law of conservation of mass gives clear evidence that matter is conserved in the chemical reaction
Experiments in the 1700s by a French chemist named Antoine Lavoisier led to the conclusion of conservation of mass. Lavoisier carefully measured the mass of reactants and products in multiple chemical reactions.
He carried out all the reactions inside a sealed jar. In each and every case, the total mass of the jar and its contents remained the same after the reaction as it was before the reaction took place.
This showed proof that matter was neither created nor destroyed in the reactions. Another outcome of Lavoisier’s research was the discovery of oxygen which was also a remarkable discovery as we all know.
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. For example, the carbon atom in coal becomes carbon dioxide when it is burned into ashes. The carbon atom changes from a solid structure to a gas but its mass remains the same. It does not change at all.
All these observations led to the theory that mass/ matter is conserved in a chemical reaction
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