The volume of a 2.50M NaOH solution required to make 725 mL of a 0.150M NaOH solution is 43.5mL.
How to calculate volume of a solution?The volume of a solution can be calculated using the following expression:
CaVa = CbVb
Where;
Ca = initial concentrationCb = final concentrationVa = initial volumeVb = final volumeMolarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
According to this question, 2.50M NaOH solution are required to make 725 mL of a 0.150M NaOH solution. The volume required can be calculated as follows:
2.5 × Va = 725 × 0.150
2.5Va = 108.75
Va = 43.5mL
Therefore, 43.5mL is the volume of the solution.
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What is the mass in grams of 7.64 x 10^25
molecules of l₂?
Mass of 7.64 x 10^25 molecules of l₂ is 3.04 grams
Calculation of mass here we are doing from the number of molecules given. To do so we use the Avogadro's number. Avogadro's number is one of the most fundamental constants of chemistry. It helps us to compare the different atoms or molecules of given substances where the same number of atoms or molecules are being compared.
Along with that we will also be using the number mole as well here. number of moles is nothing but the given mass divided by the molecular mass of the compound.
To solve the above given question we use the below given formulas;
number of molecules = Number of moles × Avogadro number
Number of moles = Number of molecules
Avogadro number
⇒ 7.64×[tex]10^{25}[/tex] = 0.012 moles
6.023×[tex]10^{23}[/tex]
Mass = Number of moles × Molecular mass
⇒ 0.012 × 253.80 = 3.045 grams
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Which of the atoms listed below has the largest radius?
A) AI
B) P
C) Si
D) Na
E) Mg
According to the given statement Na of the atoms listed below has the largest radius.
What is an atom?An atom is made up of a core nucleus and one or even more electrons with negative charges that orbit it. The positively charged, comparatively hefty protons and neutrons that make it up the nucleus may be present. The fundamental building components of matter are atoms.
How are atoms made?Atoms are made up of a nucleus in the center that is surrounded by protons, neutrons, and electron. Uranium is divided into smaller atoms during the fission process, creating new atoms. The creation or atoms in enormous numbers can be seen in the Big Bang and Supernova phenomena.
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Which of these is a safe lab practice?
A. Going to talk to your friend across the room while the Bunsen burner is on.
B. Labeling all chemicals immediately.
C. Picking up a hot beaker with your hands.
D. Pouring all the leftover chemicals and products down the drain.
Answer:
b labeling all chemical immediately
17. 1s² 2s² 2p 3s² 3p6 4s² 3d¹0 4p65s¹ symbol?
What effect do energy levels have on effective nuclear charge?
is A2+C3H6->C3H6A2 an addition reaction?
Yes. The reaction is an addition reaction.
What are addition reactions?Addition reactions are reactions where 2 or more reactants combine to form a single product. Addition reactions are otherwise known as synthesis reactions because they often result in the synthesis of new molecules entirely.
Generally, addition reactions can be represented by the following equation:
A + B ---> AB
They are quite different from decomposition reactions in which a single product decomposes to form 2 or more products or substitution reactions in which an atom displaces another atom in a compound.
Thus, the reaction [tex]A_2 + C_3H_6 --- > C_3H_6A_2[/tex] is an addition reaction.
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What is the possible chemical formula formed between Hydrogen ion and Nitrate
ion?
H₂NO3
H₂NO3
H3NO2
HNO3
what is the simplest formula of calcium Carbonate if it contains to 40% calcium,20% carbon, 48% oxygen?
The simplest form of calcium carbonate is CaCO3.
What is the use of Calcium carbonate?
Calcium carbonate can be used as a dietary supplement when the amount of calcium in a person's body is less. Calcium is used even as an antacid. Calcium is necessary by the body for bones, heart and muscles.
In this, we are not provided the direct masses, so we will use this percentage composition.
The number of moles of each element are:
Ca-40/40= 1
C- 20/12 = (1.6 considered to be 1)
O- 48/16 = 3
Now all the three will be divided with the lowest value and that is 1, so the ratio of Ca: C: O= 1:1:3
Therefore, the simplest formula is CaCO3.
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How many grams of sodium iodide, Nal, must be used to produce 90.2 g of iodine, 1₂?
mass:
g Nal
300 grams of sodium iodide, Nal, must be used to produce 90.2 g of iodine, I₂
Sodium iodide is the ionic compound formed from the chemical reaction of sodium metal and iodine
Here given data is
I₂ has the molar mass = 253.8g/mol
So how many moles of I₂ we want to produce = 90.2 g I₂ ×1mol I₂ /253.8g/mol = 0.35 mole of I₂
Then the conversion of NaI to I₂ are
2 NaI → 2Na + I₂
0.35 mole of I₂ × 2 mole of NaI/mole of I₂ = 2 mole of NaI are needed
covert this value into gram
2 mole of NaI ×150. g NaI / mole NaI = 300 gram NaI would be needed
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(6 pts) A compound was analyzed and found to contain 14.14% C, 2.38% H, and 83.48% Cl.
Determine the empirical formula for this compound.
The empirical formula for this compound is CH₂Cl₂.
C = 14.14% / 12 = 1.17
H = 2.38% / 1 = 2.38
Cl = 83.48% / 35.5 = 2.35
Now, divide by 1.17
C = 1.17 / 1.17 = 1
H = 2.38 / 1.17 = 2
Cl = 2.35 / 1.17 = 2
Therefore, The empirical formula for this compound is CH₂Cl₂.
In chemistry, the empirical formula of a chemical compound is the best entire variety ratio of atoms found in a compound.
There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas display the best whole-range ratio of atoms in a compound, molecular formulas show the quantity of every kind of atom in a molecule, and structural formulas display how the atoms in a molecule are bonded to every different.
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Use the drop-down menus to identify the parts of DNA.
Label A
Label B:
The DNA parts are identified as:
Label A is Nitrogen basesLabel B is Sugar phosphate backboneWhat are genetic codes?Genetic codes are nucleotide sequences in deoxyribonucleic acids (DNA) and ribonucleic acids (RNA) that determines the order of an amino acid which is the building block of proteins. It is a set of rules for translating information encoded genetic materials by living cells.
The part labelled A are called Nitrogen bases containing adenine and thymine, T pair, cytosine, C and guanine, G pair that are bound to form DNA while the Sugar phosphate backbone forms the structural base of the DNA and RNA.
The complete question is:
Use the drop-down menus to identify the parts of DNA.
Label A
Label B
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Answer: Label A is nitrogen bases
Label B is sugar phosphate backbone
Which of these ground state ions has unpaired electrons
Mg 2+
P2-
Sc2+
S2-
V5+
The ground state ion that has unpaired electrons is Sc²⁺ ion; option C is correct.
What is ground state ion?The ground state ion is the state in which all its electrons are in the lowest energy orbitals possible. You can get positive ions by removing electrons until you reach a noble gas configuration.
Ground state ion configurations are the foundation for understanding molecular bonding, properties, and structures. From the electrons in an atom to the differing orbitals and hybridization, the ground state ion configuration throws light on many different atomic properties.
For example, the electronic configuration of Sc²⁺ is 1s²2s²2p⁶3s²3p⁶ 3d¹ 4s.
In conclusion, understanding electronic configuration leads to an understanding of the periodic table.
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What mass of magnesium bromide is formed when 1.00 g of magnesium reacts with 5.00 g of bromine? Mg + Br2 MgBr2
From the mole ratio of the reaction, the mass of magnesium bromide formed when 1.00 g of magnesium reacts with 5.00 g of bromine is 2.88 g.
What is the mole ratio of the reaction between magnesium and bromine to form magnesium bromide?The mole ratio of the reaction between magnesium and bromine to form magnesium bromide is found in the equation of the reaction.
The equation of reaction is given below as follows:
Mg + Br₂₂---> MgBr₂Mole ratio of magnesium to bromine is 1 : 1
Moles of magnesium reacting = 1 / 24 moles
Moles of magnesium = 0.0416
Moles of bromine reacting = 5 / 180
moles of bromine reacting = 0.0277 moles
Bromine is the limiting reactant
Mass of magnesium bromide formed = 0.0277 * 104 g
Mass of magnesium bromide formed = 2.88 g
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You have a container with a semi-permeable membrane in the middle separating a left and right side. On the left side of the container is a high concentration of salt solutes, what will happen to the solutes in the container?
What will happen to the solute molecules on the left side of the container would depend on the kind of solution present on the right side.
What is osmosis?What will happen to the solutes in the container can be explained using osmosis.
Osmosis refers to the movement of water molecules from the region of high water potential or low solute concentration to the region of low water potential or high solute concentration through a selectively permeable membrane.
Now, let us assume that the solution on the right side of the container has a lower solute concentration, which means that water molecules would move from the right side to the left side through the semi-permeable membrane. The solutes in the left side of the container would become diluted.
If it were to be the other way round, that is, the solution on the right side has more solutes than the one on the left side. Water molecules will move from the left side to the right side. Thus, the solution on the left side will become more concentrated as a result of water loss.
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What is the name of the compound CH3CH(CH3)C(CH3)3?
tetramethylpropane
2,2,3-trimethylbutane
isoheptane
1,1,1,2-tetramethylpropane
The molecular formula for the compound in the task given above is 2,2,3-trimethylbutane.
The correct answer choice is option b.
What is meant by the name or the molecular formula of a compound?The molecular formula of a compound is the name of the compound derived from its structural formula. From the task given above, the parent chain is butane. There are three different substituents groups; 2 different methyl group on carbon 2 and another methyl substituent at carbon 3.
The image to further illustrate the solution to the above problem is attached.
That being said, organic compounds are those compounds which contains carbon and hydrogen.
In conclusion, from the detailed explanation above, it can be deduced that the name of the compound above is 2,2,3-trimethylbutane
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The pressure 40.0 m under water is 494 kPa. What is this pressure in bar? =
One kilopascal of pressure is 0.01 bar pressure. Thus 494 kilopascal pressure is 4.94 bar pressure.
What is pressure?Pressure is an intensive quantity measuring the force produced on body by a mechanical stress. Pressure of a substances is inversely proportional to the volume and directly proportional to the temperature.
Pressure of a substance can be expressed in different units where, the SI unit is atm or atmospheric pressure. Other units are bar, pascal, kilopascal etc.
One kilopascal pressure = 0.01 bar. Hence, 494 kilopascal is:
(494 Kpa × 0.01 bar) / 1 kpa = 4.94 bar.
Hence, 494 Kpa pressure is 4.94 bar.
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What is the mass of an object that has a density of 2.2 g/ml and a volume of 6.0 mL
Hi! please help me identify the IUPAC name for the structures
The IUPAC names of the organic compounds would be as follows:
1. Methanol or 1-Methanol
2. Propan-2-ol or 2-Propanol
3. 2-MethylButane
4. 1-Hexanol
5. 1-Heptanol
Naming organic compoundsIn the naming of organic compounds, some fundamental rules come into practice. Some of these rules include:
The longest carbon chain, otherwise known as the parent chain, is considered.The substituents must be identifiedThe parent chain should be named such that the substituents are located on the lowest-numbered carbons. Repeated substituents are named accordingly.Different substituents are named alphabetically and substituents with lower alphabets are considered for the lowest-numbered carbons.Following these rules and more, the name of the organic compounds whose structures are shown in the image would be as follows:
Methanol or 1-MethanolPropan-2-ol or 2-Propanol2-MethylButane1-Hexanol1-HeptanolMore on IUPAC naming can be found here: https://brainly.com/question/16631447
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A balloon at 30.0°C has a volume of 222 mL. If the temperature is increased to 64.1°C and the pressure remains constant, what will the new volume be, in mL?
Answer:
Explanation:
I forgot
1 gram of hydrogen ALWAYS reacts with 8 grams of oxygen. Precious mixes 2g of hydrogen with 20g of oxygen. (i) How much water is formed? [2
Answer:
18g
Explanation:
1g H + 8g O = 9g H2O since H is limiting factor
15. What goes in the box for the following fusion
equation?
2 H + 2 H —> (__) + energy
1. 1
The box for the following fusion equation 2 H + 2 H —> (2H₂) + energy
An critical fusion reaction for practical electricity generation is that between deuterium and tritium (the D-T fusion reaction). It produces helium (He) and a neutron (n) and is written D + T → He + n. To the left of the arrow (earlier than the response) there are protons and 3 neutrons. The same is genuine on the proper.
Fusion guarantees a without a doubt endless shape of power that, in contrast to fossil fuels, emits 0 greenhouse gases and, not like the nuclear fission electricity used today, produces no lengthy-lifestyles radioactive waste.three.
Calculation:-
2 H + 2 H —> (2H₂) + energy
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what product is formed when magnesium undergoes combustion?
To solve such this we must know the concept of combustion reaction. Combustion reaction happens in presence of oxygen. Magnesium oxide is formed when magnesium undergoes combustion.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
When magnesium undergoes combustion, the magnesium oxide is formed.
2Mg+O₂[tex]\rightarrow[/tex]2MgO
Therefore, magnesium oxide is formed when magnesium undergoes combustion.
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what indicates the follwing percentage of the natural occurance of an isotope ofc an element
Natural abundance indicates the following percentage of the natural occurrence of an isotope of an element on the planet.
Natural abundance is defined as the relative amount of the isotopes of an element which occurs in nature. It is also known as geonormal abundance.
Natural abundance is also represented as percentage value.Relative atomic mass can be determined by using the natural abundance value of an isotope of an element.Relative atomic masses of any isotope can be easily determined if we know the atomic masses and their respective abundances.The formula to calculate the natural abundance of an element with two isotopes is given as :
x + (1 - x) = 1
Where,
x represents the fractional value of isotope-1 and 1 - x represents the fractional value of isotope-2.
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3. Look at the positions of calcium, beryllium, and magnesium on the periodic table. Based on
their locations, predict how many valence electrons these elements have and predict what
the reactivity of these elements will generally be.
Answer:
Reactivity of these elements as follow
Calcium > Magnesium > Beryllium
What is valance electron?
A valence electron is an electron connected with an atom and capable of participating in the formation of a chemical bond; in a single covalent connection, both atoms contribute one valence electron to form a shared pair. The existence of valence electrons can affect the element's chemical characteristics and ability to bind with other elements: a valence electron can only be in the outermost electron shell of a main group element.
The valence shell, also known as the valence orbital, is the orbital found in the atom's outermost area. These valence shells contain electrons known as valence electrons, which are responsible for the chemical process. When one electron is withdrawn or added to this valence shell, the basic goal is to complete the element's octet.
The elements beryllium (Be), magnesium (Mg), calcium (Ca), have two electrons in their valence shells, giving them an oxidation state of +2
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Acetylsalicylic acid, C9H8O4, is the pain reliever in many
headache medications. A typical tablet contains 250.0 mg
of acetylsalicylic acid.
(a) Calculate the amount of acetylsalicylic acid in the tablet.
(b) Calculate the number of hydrogen atoms in the amount
of acetylsalicylic acid in the tablet determined in (a).
The amount of acetylsalicylic acid in the tablet is 0.001389 moles and the number of hydrogen atoms in the amount of acetylsalicylic acid in the tablet is 6.69 × 10²¹.
(a)
The formula of acetylsalicylic acid is C₉H₈O₄.
Molar mass of C₉H₈O₄ = 9 × atomic mass of C + 8 × atomic mass of H + 4 × atomic mass of O
= 9 × 12 + 8 × 1 + 4 × 16
= 108 + 8 + 64
= 180
No of moles of acetylsalicylic acid = Given mass / molar mass
= 0.25 / 180
= 0.001389
Hence, the number of moles of acetylsalicylic acid is 0.001389 moles.
(b)
Number of hydrogen atoms present in 1 mole of acetylsalicylic acid = 6.023 × 10²³ atoms
Number of hydrogen atom present in 0.001389 moles of acetylsalicylic acid = 0.001389 × 6.023 × 10²³ = 0.008365 = 8.36 × 10²⁰ atoms.
Now there are 8 hydrogen atoms in acetylsalicylic acid so,
Number of atoms of hydrogen in acetylsalicylic acid = 8 × 8.36 × 10²⁰ atoms = 6.69 × 10²¹ atoms.
Hence, the number of atoms of hydrogen in 0.001389 moles of acetylsalicylic acid is 6.69 × 10²¹ atoms.
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What is the balanced equation for this reaction, which takes place in a basic solution?
Cr(OH)3(s) + ClO3–(aq) → CrO42 (aq) + Cl–(aq)
Cr(OH)3(s) + 2ClO3–(aq) + 6OH–(aq) → 3CrO42–(aq) + 2Cl–(aq) + 2H2O(l)
Cr(OH)3(s) + 2ClO3–(aq) + 4OH–(aq) → 2CrO42–(aq) + Cl–(aq) + 3H2O(l)
2Cr(OH)3(s) + ClO3–(aq) + 4OH–(aq) → 2CrO42–(aq) + Cl–(aq) + 5H2O(l)
2Cr(OH)3(s) + 2ClO3–(aq) + 6OH–(aq) → 2CrO42–(aq) + 2Cl–(aq) + 7H2O(l)
The balanced equation for the redox reaction, which takes place in a basic solution is:
2 Cr(OH)₃ + ClO₃⁻ (aq) + 4 OH⁻ → 2 CrO₄²⁻ (aq) + Cl⁻ (aq) + 5 H₂O; option CWhat is the balanced equation for the redox reaction?A balanced equation for a redox reaction is one in which the electrons transferred are balanced and the atoms involved in the reaction are also balanced.
To balance redox reactions in a basic solution, OH⁻ ions and H₂O are placed on appropriate sides of the reaction.
Considering the given reaction:
Cr(OH)₃ + ClO₃⁻ (aq) → CrO₄²⁻ (aq) + Cl⁻ (aq):
The balanced equation will be:
2 Cr(OH)₃ + ClO₃⁻ (aq) + 4 OH⁻ → 2 CrO₄²⁻ (aq) + Cl⁻ (aq) + 5 H₂O
The electrons transferred and the atoms involved are balanced.
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hcn is classified as a weak acid in water.this means that it produces
HCN is classified as a weak acid because it partially ionizes in water to produce hydrogen ions as the only positive ion.
What is an acid?There are several definitions for acids.
It is a substance that turns blue litmus paper to red when wet.It is any substance whose pH lies between 0 and 7.It is a substance that when ionizes in water, produces hydrogen ions as the only positive ion.HCN ionizes in water according to the following equation:
[tex]HCN < --- > H^+ + CN^-[/tex]
Because the HCN is only partially ionized and not a complete ionization, it is said to be a weak acid because hydrogen ion is still formed as the only positive ion.
Strong acids produce hydrogen ions as their only positive ions but are completely ionized in water, unlike weak acids.
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What makes an element give off a specific color? Please explain.
The elements give off specific color because the energy of shells of different elements are specific.
Electrons when excited jump from a lower energy level to higher energy level. in higher energy level the electron are less stable . so, after some time they return from higher to lower energy level an emit some light of different wavelength of specific colors. The difference in the energy of the shells of the atom are specific. the color of different elements are different because of the light emitted and the wavelength is inversely proportional to energy.
E = hc / λ
Thus, The elements give off specific color because the energy of shells of different elements are specific.
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Can anyone help me in this question? (Q13 part A, B, and C)
Answer:
a. Yes, both W and Y have the same atomic number. Since the atomic mass equals the sum of protons (which is the atomic number) and neutrons, both W and Y have different numbers of neutrons, making them isotops of each other.
b. Both W and Y have the same atomic number, making both the same element. Therefore they have the same chemical properties.
c. W: 29 protons, 34 neutrons, 29 electrons
Y: 29 protons, 36 neutrons, 29 electrons
Explanation:
a. Yes, both W and Y have the same atomic number. Since the atomic mass equals the sum of protons (which is the atomic number) and neutrons, both W and Y have different numbers of neutrons, making them isotops of each other.
b. Both W and Y have the same atomic number, making both the same element. Therefore they have the same chemical properties.
c. W: 29 protons, 34 neutrons, 29 electrons
Y: 29 protons, 36 neutrons, 29 electrons
Remember: mass number = protons (atomic #) + neutrons
HELP !!!!!!! pls. with chemistry
Answer:
Qns no.3: it is not a correct answer
Explanation:
S has 6 outermost electrons and O has 6 outermost electrons, during bonding inorder to be stable their shouldn't be any unpaired electron in a structure. so 2 double bonds will be formed.
