Answer:
hydrogen bonds are also known as electrostatic dipole interaction
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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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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What would be the number of na , k and atp molecules inside the cell after 100 cycles of the pump and what would be the net charge differential across?
The number of sodium, potassium and ATP would be: 700 Na+ ions, 200 K+ ions and 900 ATP molecule.
The net charge differential would be -200.
Potassium is important for keeping the body hydrated and with sodium support cellular function (sodium-potassium ( Na⁺/K⁺) pump).
The sodium-potassium pump releases three Na+ ions, while in the same time two K+ ions exit the cell. For this process one molecule of ATP is consumed.
Inside the cell, there are 1000 sodium ions, 1000 molecules of ATP.
While outside the cell, there are 1000 potassium ions.
After 100 cycles, 300 sodium ions will exit the cell and 200 potassium ions will enter the cell, using 100 ATP molecules.
1000 - 300 = 700; number of sodium ions (Na+) left in the cell
1000 - 100 = 900; ATP molecules left in the cell
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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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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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a girl slides down a plastic slide. when she gets up, her hair is in the air. why is this so?
Answer:
because when girl slide down then her body was in full speed and after that she gets up her hair is in the air because when she slide down her hair was also blowing in the air and after that her body thinks that they're still sliding down.so,it happened.
how many grams of iron will be needed to react completely with an excess of oxygen to form 40 grams of iron oxide ?
Answer:
28g Fe
Explanation:
source: https://www.answers.com/Q/How_many_grams_of_iron_will_be_needed_to_react_completely_with_an_excess_of_oxygen_to_form_40_grams_of_iron3_oxide
Which answer contains the substances known as fossil fuels?
Which answer contains the substances known as fossil fuels?
wood, oil, geothermal
oil, natural gas, coal
wind, oil, coal
natural gas, solar, coal
oil, natural gas, coal..........
Answer:
Coal, oil, and natural gas
Explanation:
Coal is a material usually found in sedimentary rock deposits where rock and dead plant and animal matter are piled up in layers.
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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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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Rank the following in order of increasing negative charge on carbon.
ch3ich3; ch3imgbr; ch3ili; ch3if; ch3ioh; ch3inh2
The correct order of increasing negative charge on carbon atom is :
CH₃F < CH₃OH < CH₃NH₂ < CH₃CH₃ < CH₃MgBr < CH₃Li
when the electronegativity of the element increases the positive charge on carbon will increases and negative charge on the carbon atom will decreases.
Electronegativity ∝ (+ charge on carbon)
Electronegativity ∝ 1 / (- charge on carbon)
Electronegativity is defined as tendency of an atom or group to attract electrons towards itself. higher the electronegativity of an atom , the more strongly that elements attract the electron towards itself. as the proton increases the electronegativity or attraction increases.
according to electronegativity the following order of increasing negative charge on carbon as follows:
CH₃F < CH₃OH < CH₃NH₂ < CH₃CH₃ < CH₃MgBr < CH₃Li
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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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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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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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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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One of the radioactive isotopes used in chemical and medical research is iodine-125, which has a half-life of 61 days. how long would it take for 0.25 g to remain of a 1.00 g sample of iodine-125?
Having a half-life of 61 days, iodine-125 would take 122 days for a 0.25 g of iodine-125 to remain from 1.00 g of it.
Half-life, an aspect of radioactive decay, is defined as the amount time it takes a radioactive isotope to disintegrate by a half. The formula for half-life is given by:
N(t) =N(0) 1/2 ^ t/t(1/2)
where N(t) = amount of substance remaining
N(0) = initial amount of substance
t = elapsed time
t(1/2) = half-life of the substance
Using this formula where N(t) = 0.25 g, N(0) = 1.00 g, and t(1/2) = 61 days,
N(t) =N(0) 1/2 ^ t/t(1/2)
0.25 g = 1.00 g x (1/2)^t/61
(1/2)^t/61 = 1/4
t = 122 days
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A student wonders whether a piece of jewelry is made of pure silver. she determines that its mass is 3.17 g. then she drops it into a 10 ml graduated cylinder partially filled with water, and determines that its volume is 0.3 ml. could the jewelry be made of pure silver?
No, the jewelry, could not be made of pure silver.
State characteristics properties of silver.The characteristics of pure silver include being almost white, shiny, soft, ductile, malleable, and a superb conductor of both heat and electricity. Although it is not a chemically active metal, heated concentrated sulfuric acid and nitric acid both attack it and cause nitrate to form. Silver is one of the so-called precious metals, along with gold and the metals from the platinum group. Silver has been used for many years to make coins, ornaments, and jewelry due to its relative rarity, dazzling white color, malleability, ductility, and resistance to air oxidation. Silver is also a soft, malleable, highly ductile, and shiny metal. Despite having the highest electrical conductivity of any metal, its exorbitant cost prevents it from being widely used for electrical purposes. Silver is not a metal that reacts chemically.
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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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What type of molecule is shown below?
A. Alkene
B. An Alkane-alkene
C. An alkane-alkyne
D. An alkane
Answer: Alkene
Explanation:
this hydrocarbon has a double bond so it is an alkene. it only needs to have 1 double bond in the formula.
if there were only C-C bonds in the molecule it would be an alkane. If there was a triple bond between 2 carbons it would be an alkyne.
When an acid is dissolved in water, how does it change the solution's ph?
When an acid is dissolved in water, by releasing protons into the solution, it lowers the pH.
What is pH?
The letters pH stand for the potential of hydrogen since pH is essentially a measurement of the number of hydrogen ions (i.e. protons) in a substance. The pH scale was created in 1923 by scientist Peter Lauritz Srensen. (1868-1969).
The pH of a solution is a key marker of its chemical makeup. The pH can have an impact on the biological processes that take place, the behavior of bacteria, and the behavior of chemicals.
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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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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.
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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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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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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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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In this way, _____ of water through ____ bonds to the molecules, which comprise the v illi on the cat's tongue
In this way, the Adhesion of water through hydrogen bonds to the molecules, which comprise the Villi on the cat's tongue.
What is Adhesion?
The act or quality of sticking or remaining fastened: the glue's adherence to the wood b. Physics The attraction between two substances that is strong enough to be seen at a macroscale and is caused by their differences.
What kind of bonds do water molecules form?
Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water. A bond known as a hydrogen bond is formed when individual water molecules are attracted to one another.
Which of the cat's tongue's villi works to resist gravity's pull downward?
By forming hydrogen bonds with the molecules that make up the villi on the cat's tongue, water adheres to them in this way, helping to fend off the effects of gravity. As a result, the phenomenon of adhesion aids in the maintenance of entire, joined drops of water.
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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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scientific process how can a casual question be answered 3 hypotheses water experiment
There are 3 experiments which helps to under water evaporation system.
Both the temperature of the air surrounding the water and the rate of evaporation increased. In the second experiment, we observed an increase in air flow around the water, and this time, the rate of evaporation increased as well. In the third and final experiment, we observed an increase in the amount of light in the room, and this time, the rate of evaporation increased as well.Because the kinetic energy of a substance can be measured by its temperature, increasing in the temperature or kinetic energy of the air around water will also increase the kinetic energy of the water, which will increase the rate of evaporation.It's crucial to have good air flow since it drives water droplets in the air away from you, reducing the amount of humidity in the region. Because there will then be space for the evaporated air or space for the evaporated water to flow into the air, it will then be simpler for the water to really evaporate.Water in the presence of sunlight is given extra energy, which increases evaporation.Learn more about Evaporation here:
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find the number of h atoms present in NH2 CONH2
Answer:
Prolly 4
NH2 CONH2
Explanation: