a. 55.0 g of ti = 0.02 moles
b. 16.9 mg of na = 0.62 moles
c. 7.95 x 1024 ne atoms = 0.4 moles
d. 25 xe atoms = 0.0037 moles
What is mole?In chemistry, the term "mole" (sometimes written "mole") refers to a standard scientific unit for measuring vast amounts of extremely small objects like atoms, molecules, or other specific particles.
The mole represents 6.02214076 × 10^23 units, an astronomically huge number. With effect from May 20, 2019, the International System of Units (SI) adopted this number as the mole definition by the General Conference on Weights and Measures.
The number of atoms found in 12 grams of carbon-12, as established scientifically, made up the definition of the mole in the past. The quantity of units in a mole is also known as Avogadro's number or Avogadro's constant in honor of the Italian physicist Amedeo Avogadro (1776–1856).
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The density of a material is a/an ___________.
a) chemical property
b) extensive property eliminate
c) intensive property
d) reactive property
The density of a material is an intensive property.
What is intensive property?
An intensive property of matter is one that does not change with the amount of matter. It is a bulk property, which means that it is a physical property that is independent of sample size or mass. An extensive property, on the other hand, is one that is affected by sample size.
What factors influence an intensive property?Intensive properties are those that are determined solely by the characteristics of the material and not by its quantity - for example, density, temperature, refractive index, color, and pressure. Intensive properties are not additive, which means their value does not change when the amount of material is changed.
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find the number of h atoms present in NH2 CONH2
Answer:
Prolly 4
NH2 CONH2
Explanation:
Rutherford proposed the __________. nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant
Rutherford proposed the atomic model nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant.
The atomic nucleus is the tiny center of an atom that contains practically all its mass. Ernest Rutherford put forward the nuclear structure of the atom, discovered alpha and beta rays, and also projected the laws of radioactive decay. Complete step by step answer we must know that the nuclear theory of the atom was put forward by Rutherford. the law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.
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In which direction does heat flow? a. down b. up c. from a cold substance to a cold substance d. from a warm substance to a cold substance
The heat will flow from a warm substance to a cold substance.
The movement of heat from a hotter object to a chillier one – when two resources at exclusive temperatures are blended together, warmth flows from the warmer physique to the cooler body until they attain the equal temperature (Zeroth Law of Thermodynamics – Thermal Equilibrium)
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Solution of known concentration that is slowly added to a solution of unknown concentration.
A solution of known concentration that is slowly added to a solution of unknown concentration is called titrant.
Titration is the steady addition of a known concentration solution (called a titrant) to a known volume of an unknown concentration solution until the reaction approaches neutralization, which is sometimes indicated by a color change.
Until the reaction is complete, the analyte (the unknown solution) is normally added in a known amount to the titrant (the known solution) through a buret. Knowing the volume of titrant added allows the concentration of the unknown to be calculated. An indicator is often used to indicate the reaction's endpoint or end of reaction.
Therefore, titration is a technique used to determine the concentration of an unknown solution.
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How many grams of kmno4 correspond to 3.13 x 1022 formula units of kmno4? avogadro's number is 6.022 x 1023.
8.21g of KMnO₄ correspond to 3.13 x 10²² formula units of KMnO₄? avogadro' s number is 6.022 x 10²³
Here,3.13 x 10²² formula units of KMnO₄=1 mole of KMnO₄/avagadro no
1 mole of KMnO₄/6.022 x 10²³
= 3.13 x 10²²/6.022 x 10²³
= 5.197moles of KMnO₄
Now KMnO₄ has molar mass is 158.034g/mol
5.197moles of KMnO₄=158.034/1 mole of KMnO₄
158.034×5.197=821.1g of KMnO₄
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7. Which of the following is a molecule?????
(A) K (C) Na
(B) Ne (D) HI ......
Answer:
the answer is
(D) HI
Explanation:
U-235, the isotope of uranium commonly utilized in nuclear power plants, is _____.
U-235 is utilized for fuel for nuclear power plants and the nuclear reactors that run naval ships and submarines
U-238 makes up 99.27% of natural uranium, together with 0.72% of U-235 and 0.005% of U-234. U-235 is the most often used isotope of natural uranium in nuclear power plants, but because it only makes up 0.72% of natural uranium, it must be enriched in order to be used as fuel in these facilities. The U-238 uranium isotope is the most prevalent and the heaviest of the three naturally occurring uranium isotopes. The uranium fuel is put together in a nuclear reactor so that a regulated fission chain reaction may occur. By splitting the U-235 atoms, heat is produced. This heat is then utilized to create steam, which spins a turbine and powers an electricity-generating generator.
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What is the approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0?
The approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0 is based on the equation A = εbc given in the passage, the concentration c is the absorbance A divided by the absorptivity ε in a 1 cm path length cell. 0.7 divided by approximately 1400 gives 500 μM.
A = εbc
0.7 = 1400 x c
7/14000 = 1/2000 = 0.0005 = 5x10^-4 = 500 μM
1 μM = 1 x10 ^-6
The concentration of a substance is the amount of solute present in a given volume of solution. Concentration is usually expressed in molarity, defined as the number of solutes in 1 L of solution. Solution concentration is a measure of the amount of solute dissolved in a given amount of solvent or solution.
Concentrated solutions are solutions that contain relatively large amounts of solutes. Dilute solutions are solutions that contain relatively small amounts of solutes. The definition of concentration means the amount of an ingredient or part relative to other ingredients or parts. An example of concentration is the amount of salt to water in a brine solution.
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Which d electron count can exhibit both high-spin and low-spin states in an octahedral complex?
d5 electron count can exhibit both high-spin and low-spin states in an octahedral complex
Electron is a free, open-source software framework developed and maintained by GitHub. This framework is designed to build desktop applications using web technologies rendered using a variant of the Chromium browser engine and a backend using the Node.js runtime environment.
Electrons are negatively charged subatomic particles that are free to (not) bond with atoms. Electrons bound to atoms are one of the three main types of particles within atoms. The other two are protons and neutrons. Electrons, protons, and neutrons together form the nucleus.
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A chemist can determine the mass of K in a sample of known mass that consists of either pure K2O or pure K2O2. From this information, can the chemist answer the question of which compound is in the sample?
Yes , the chemist can answer if the compound in K2O or K2O2
The chemical formula and composition of both the compounds is entirely different. The compound K2O2 has an additional molecule of oxygen than K2O and hence will have have higher molecular mass.
In the compound K2O
molecular mass= 2x 39+16 =94
mass ratio of K in compound= 78/94 = 0.830
In the compound K2O2
molecular mass= 2x 39+16X2 =110
mass ratio of K in compound= 78/110 = 0.710
and hence by the required ratio while extracting K , the chemist may know if the compound is K20 or K2O2
If the ratio is anything different from 0.830 and 0.710 then the compund will be something different
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How many h atoms are in 259 g of c12h21o9? molar mass of c12h21o9 = 309.29 g/mol
Number if atoms in 259 g of [tex]C_12H_2_1O_9[/tex] is [tex]5.04*10^{23}[/tex]
We know that according to Avogadro's law , number of atoms in one mole of molecule is [tex]6.022*10^{23}[/tex] .
In given question we have to find number of atoms in 259 g of [tex]C_12H_2_1O_9[/tex]
The molar mass of [tex]C_12H_2_1O_9[/tex] is given that is [tex]309.29 g/mol[/tex]
Therefore total number of moles = [tex]given mass / molar mass[/tex]
Number of moles = [tex]259/309.29[/tex]
=[tex]0.8374[/tex]
Thus, number of atoms in 0.8374 mole of [tex]C_12H_2_1O_9[/tex] is given by
= [tex]0.8374 * 6.022 * 10^{23}[/tex]
= [tex]5.04*10^{23}[/tex]
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A concentrated salt solution has a mass of 5.34 g for a 5.00 ml sample. what is the specific gravity of this solution?
The specific gravity of the solution is 1.07, which contains 5.34g for a 5.00ml sample.
Density of a substance is
Density = Mass / Volume
= 5.34/5
= 1.07
Density of water = 1
Specific gravity = Density of substance/density of solvent
Specific gravity = 1.07 / 1
Specific gravity = 1.07
Specific gravity, often known as relative density, is the ratio of a substance's density to that of an industry standard.
If a material has a relative density that is less than 1 compared to the reference, it is less dense than the reference; if it is larger than 1, it is denser. Identical volumes of the two substances have the same mass if the relative densities are equal, or exactly 1.
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Discuss two properties of the atomic structure of copper that make it a good conductor.
The two properties of the atomic structure of copper that make it a good conductor is:
In copper, there is enough heat energy at ordinary room temperatures to liberate a vast number of weakly held valence electrons. The presence of a large number of free electrons in copper, as in other metals, is what makes it a good conductor of electricity.In copper, at normal room temperature, there is enough thermal energy to eject a large number of weakly held valence electrons. Like other metals, copper has a large number of free electrons, which makes it a good conductor of electricity.
In order for current to flow through metal, the current source must fight resistance. The lower the resistivity, the higher the electrical conductivity of the metal. Copper wire is also a good electrical conductor due to its low resistivity.
Other materials sometimes used as conductors are silver, gold, and aluminum. Copper is still the most popular material for wire because it is a very good conductor of electricity and is very cheap compared to gold and silver.
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What two effects a soluble impurity usually has on the melting point of a compound.
The two effects a soluble impurity usually has on the melting point of a compound are increase or decrease in the melting point of the compound.
The temperature at which a substance transforms from a solid into a liquid is known as its melting point. Melting happens for a pure substance at a single temperature.
The more prevalent soluble contaminants are organic matter, sodium chloride, sodium sulphate, sodium carbonate, magnesium chloride, calcium chloride, calcium sulphate, and calcium bicarbonate.
A solid's melting point is lowered by impurities, which have an impact on it. This occurs because the majority of solids have some sort of crystal lattice structure that is held together by the strong ionic binding forces. Impurities interfere with this lattice structure, weakening the bonds when they are present. Because of the weakened nature of these linkages, the solid will melt at a cooler temperature.
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Most foods that are high in calcium are poor sources of iron. this statement illustrates the characteristic of a nutritious diet known as _____.
Most foods that are high in calcium are poor sources of iron. this statement illustrates the characteristic of a nutritious diet known as balance.
Nutrition is an important factor in health and development. Better nutrition is associated with improved infant, child, and maternal health, stronger immune systems, safer pregnancies and births, reduced risk of non-communicable diseases (such as diabetes and cardiovascular disease), and longer lifespans. doing. Healthy children learn better. Well-nourished people are more productive and can create opportunities to gradually break the cycle of poverty and hunger.
Malnutrition in all its forms poses a significant threat to human health. I'm facing Malnutrition has several forms and including undernutrition (wasting or underdevelopment), inadequate vitamins or minerals, overweight, obesity, and consequent diet-related noncommunicable diseases.
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When placed inside of a magnetic field, nmr active nuclei act in what way? (1 pt)
When placed inside of a magnetic field, the magnetic field that electrons generate aligns in the opposite direction of the applied magnetic field.
Magnetic fields are used in all modern technology, especially in electrical engineering and electromechanics. Rotating magnetic fields are used in both electric motors and generators. Magnetic field interactions in electrical devices such as transformers are conceptualized and studied as magnetic circuits. Magnetic forces use the Hall effect to provide information about charge carriers within a material.
The Earth creates its own magnetic field, which protects the Earth's ozone layer from the solar wind and is important for navigating with a compass. Magnetism is a class of physical properties imparted by magnetic fields and refers to the ability to induce attractive and repulsive phenomena in other entities.
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Which substance is likely to contain the highest percentage of double bonds in the hydrocarbon chains of its triglycerides?
Olive oil substance is likely to contain the highest percentage of double bonds in the hydrocarbon chains of its triglycerides.
In organic chemistry, hydrocarbons are organic compounds composed entirely of hydrogen and carbon. [1]:620 hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colorless and hydrophobic, and their odor is usually faint or exemplified by the liquid odor of gasoline or lighters. They come in a variety of molecular structures and phases.
Examples of hydrocarbons include gasoline, kerosene, lamp oil, and furniture oil. If someone accidentally drinks a hydrocarbon product that gets into their lungs, it can cause breathing problems. Severe injury or even death can result. Hydrocarbons are the primary energy storage molecules of all major fossil fuels (including coal, oil, and natural gas) and biofuels. It is also a raw material in the manufacturing process of many types of plastics.
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The smallest particle and building block of all matter is called
HELP NEED ANSWER ASAP
Answer:
An atom is the smallest particle of an element and is the building block of all matter.
A sample of 35.0 g of magnesium undergoes oxidation. what mass of mgo is produced?
56.0g mass of MgO is produce.
A sample of 35.0 g of magnesium undergoes oxidation then the reaction is
2 Mg(s) + O2(g) → 2 MgO(s)
2×24.31 2(24.31+16)
Molar mass of Mg = 24.31 g/mol mass(Mg)= 35.0 g
35.0 g of magnesium gives 80.62 MgO
24.31 g of mg will give 24.31×80.63/35.0=56.00g
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The nuclear envelope differs from the cell membrane and the membranous endoplasmic reticulum because it _____.
The nuclear envelope differs from the cell membrane and the membranous endoplasmic reticulum because it Is a double membrane.
What is the Difference Between Nuclear Membrane and Nuclear Envelope?
Nuclear membrane and nuclear envelope vary primarily in that nuclear membrane serves as a barrier that selectively separates nucleoplasm from cytoplasm, whilst nuclear envelope serves as a structure that separates the nucleus's contents from the cytoplasm. Additionally, the nuclear envelope is made up of two nuclear membranes and nuclear pores, whereas the nuclear membrane is a lipid bilayer.
All eukaryotic cells with a nucleus have two structural elements called the nuclear membrane and nuclear envelope.
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A solution with ph 4 has __________ the h concentration of a solution with ph 8.
A solution with ph 4 has 10000 times the h concentration of a solution with ph 8.
the solution, in chemistry, is a homogeneous mixture of two or more substances whose relative amounts can be varied continuously up to the so-called solubility limit. The term solution is usually applied to the liquid state of aggregation, but gaseous and solid solutions are also possible. Hypotonic, isotonic, and hypertonic solutions (tonic).
A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. In solution, all components appear as a single phase.
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Benny pushes a 20 kg crate from rest. If the crate accelerates at a rate of 3 m/s2, what is the amount of force applied for it to move?
Answer:
60 N.
Explanation:
The force formula of acting on an object is F=ma.
This means that...
F= force
M - mass
A = acceleration
So to solve this you have to solve for F.
F=ma
F=(20kg)(3m/s^2)
F= 60 N.
I hope this helps, have a good day! :D
If the recommended daily allowance (RDA) for vitamin C is 60 mg per day and there are 70 mg of vitamin C per 100 g of orange, how many 3 oz. oranges would you have to eat each week to meet this requirement?
Please help, I'm terrible with Dimensional Analysis!!
The number of oranges to be eaten each week to meet the requirement is 7.
How are the RDA calculations done?
Mass of vitamin C is 70 mg.That is it is equal to 0.070 g.
as 1 mg=1×10[tex]^-3[/tex] g. And 60 mg is equal to 0.060 g according to this conversion.
The mass of orange in ounces is given as 3 oz.
As 1 oz=28.3495 g.Therefore,3 oz=(3×28.3495)g
which is equal to 85.045 g.
Given that 100 g orange has 0.070 g of vitamin C.Mass of vitamin C in 85.045 g of oranges is,
0.070/100×85.045=0.0595 g
Vitamin C consumed in 1 day is 0.060 g. Therefore in a week vitamin C consumed is 7×0.060=0.42 g.
To calculate the number of oranges to be eaten in a week it is calculated as,
Number of oranges=mass of vitamin C consumed in a week /mass of 3 oz oranges
Number of oranges=0.42 g/0.0595 g
=7.05≈7
Therefore,number of oranges to be eaten in a week are 7.
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Lauren walks 90 m in half a minute. What must her speed have been to travel this
distance?
90.5 m/min
0.006 m/min
45 m/min
O 180 m/min
Clear selection
Acetyl-coa enters the citric acid cycle by reacting with ________ to form ________.
Acetyl-CoA enters the citric acid cycle by reacting with oxaloacetate to form citrate.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
There are two main types of acids: organic acids and inorganic acids. Inorganic acids are sometimes called mineral acids. As a category, organic acids are often weaker than inorganic acids. The basic difference between the two is that organic acids contain carbon whereas inorganic acids do not. Natural Acids: These acids are found in foods. For example, acetic acid, tartaric acid, and lactic acid. Mineral or Inorganic Acids: These acids are used in various laboratory processes such as hydrochloric acid, and sulfuric acid.
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Write down the names of the new substances formed when each of the following substances reacts with dilute hydrochloric acid: (i) ammonia (ii) sodium hydroxide (iii) calcium carbonate
The names of the new substances formed are:
1) ammonium chloride (NH₄Cl)
2) Sodium chloride (NaCl)
3) Calcium chloride (CaCl₂) and carbon(IV) dioxide (CO₂)
1) Balanced chemical equation for reaction of ammonia (NH₃) and dilute hydrochloric acid (HCl):
HCl + NH₃ → NH₄Cl
2) Balanced chemical equation for reaction of sodium hydroxide (NaOH) and dilute hydrochloric acid:
HCl + NaOH → NaCl + H₂O
3) Balanced chemical equation for reaction of calcium carbonate (CaCO₃) and dilute hydrochloric acid:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
These chemical reactions are double displacement reactions, cations and anions of the two reactants switch places and form two new compounds.
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A particular vitamin's chemical formula has one cobalt atom. What is the molar mass of the vitamin if it contains 4.34% cobalt?
The molar mass of vitamin if it contains 4.34% of cobalt is 1358 g/mole.
How is molar mass calculated?
Molar mass is the mass of 1 mole of the compound.One mole of compound contains Avogadro's number of molecules.So,molar mass is mass of Avogadro's number of molecules.
Molar mass is also defined as mass of the sample divided by the amount of substance, measured in moles .It is a bulk quantity not a molecular property of substance. The SI unit of molar mass is kilogram per mole.
In this problem,vitamin has 1 cobalt atom .The atomic mass of cobalt is 58.93 g/mole.So according to the definition,mass of 1 mole of cobalt is 58.93 g =4.34% mass of 1 mole of vitamin.
To find 100% mass of 1 mole of vitamin
58.93/4.43×100=1358 g
Hence,the molar mass of vitamin is 1358 g.
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An analytical chemist has determined by measurements that there are 2.4 moles of carbon in a sample of acetic acid. how many moles of hydrogen are in the sample?
Analytical chemist analyses show that a sample of acetic acid contains 2.4 moles of carbon. The number of moles of hydrogen in the sample is 5.75 moles.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance. Mole can be calculated by dividing the mass by the molar mass.
Acetic acid is a colorless liquid, with a pungent smell.
The formula of acetic acid is CH₃COOH
For every 12 moles of hydrogen, there's 1 mole of oxygen.
2.4 / 12 = 0.2.
Thus, therefore, there are 5.75 moles of oxygen in the sample.
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The atomic orbital of the quantum mechanical model is very similar to the orbit described by the bohr model. True or false
The given statement is false.
In physics, a quantum (plural quanta) is the minimum amount of any bodily entity (physical property) concerned in an interaction. The vital thinking that a bodily property can be "quantized" is referred to as "the speculation of quantization".[1] This capability that the magnitude of the bodily property can take on only discrete values consisting of integer multiples of one quantum.
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