75 milliliters of stock solution are needed to make 100.0 mL of 0.750 M.
What is the stock solution?
To make a stock solution, weigh out the proper amount of a pure solid or measure out the proper amount of a pure liquid, put it in the right flask, and then dilute it to the desired volume.
NaCl stock solution is, S1 = 1.00 M.
NaCl is, S2 = 0.750 M.
NaCl is, V2 = 100 mL.
Consider, the required volume of NaCl stock solution to make the desired solution is, V1
According to the dilution law,
S1V1 = S2V2
Where, S1 = Initial strength, V1 = Initial volume, S2 = Final strength and V2 = Final volume.
So, 1.00 M *V1 = 0.750 M * 100 mL
V1 = ( 0.750 M * 100 mL) / 1.00 M = 75 mL
Therefore, 75 milliliters of stock solution are needed to make 100.0 mL of 0.750 M.
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Select the dominant intermolecular force between acetone molecules.
a. hydrogen bonding
b. London dispersion forces
c. ion-dipole forces
d. dipole-dipole forces
The dominant intermolecular forces between the acetone molecules (CH3COCH3) is dipole-dipole forces is. D
What is intermolecular force between acetone molecules?Acetone is a dipolar molecule because of the positive and negative charges formed by the carbonyl group present in the compound. Therefore the dominant intermolecular forces between the acetone molecules are dipole-dipole interactions.
Therefore the dominant intermolecular forces between the acetone molecules is dipole-dipole interactions.
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what symbols are used to represent the charges on atoms in a polar covalent bond? the polarity of the bond?
Symbols used to represent the charges on atoms in a polar covalent bond are delta (δ). For the partial negative charge it is δ− and for partial positive charge it is δ+.
What is an atom?
Each strong, liquid, fuel, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around a hundred picometers throughout. They are so small that accurately predicting their behavior the usage of classical physics, as if they were tennis balls as an example, isn't always possible due to quantum effects. Greater than 99.94% of an atom's mass is inside the nucleus. The protons have an advantageous electric charge, the electrons have a terrible electric powered rate, and the neutrons don't have any electric powered fee. If the number of protons and electrons are identical, then the atom is electrically impartial.To know more about atoms, click the link given below:
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What are six differences between nuclear reaction and chemical reaction?
The difference between the nuclear reaction and the chemical reaction is : the nuclear reaction occur inside the nucleus and the chemical reaction occurs normally outside the nucleus.
The six differences between nuclear reaction and chemical reaction :
1) The chemical reaction occurs outside the nucleus and the nuclear reaction occurs only in inside the nucleus.
2) the energy during the chemical reaction is low and the energy during the nuclear reaction is high.
3) chemical reaction either be irreversible or reversible. the nuclear reaction are reversible.
4) the chemical reaction affected by the temperature and the pressure factor. the nuclear reaction is not depend on such factor.
5) In the chemical reaction the old bond break and the new formation of bond take place. in the nuclear reaction it does not happen.
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sum of the internal energy plus the product of the pressure and volume for a reaction
Enthalpy is a thermodynamic system's internal energy total as well as the volume times pressure ratio.
What do you name a thermodynamic system's total internal energy as well as the volume times pressure ratio?As stated in the equation: H=U+PV, enthalpy (H) is the result of adding internal energy (U) and the product of pressure and volume (PV). The heat evolved (either emitted or absorbed) during a process that runs at constant pressure is equivalent to the change in enthalpy.
What are the effects of pressure and volume on internal energy?The energy within remains constant. The ideal gas law states that when a gas is compressed while maintaining a constant pressure, the temperature decreases according to the volume. In this instance, more energy than you input heats the system.
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a colorless, odorless gas that is composed of carbon and oxygen. it is absorbed from the air by plants and produced when people and animals breathe out.
Carbon dioxide is a gas composed of carbon and oxygen. This gas is breathed out by people and animals and is absorbed by plants.
In each of the carbon dioxide molecules, one carbon atom is covalently doubly connected to two oxygen atoms. At room temperature, it exists as a gas. Its chemical formula is written as CO₂.
At atmospheric temperatures and pressures, this gas is colorless, odorless, non-toxic, and inflammable. This is produced as the byproduct of metabolic reactions in animals and people and is breathed out during respiration. But plants use this carbon dioxide to produce glucose and oxygen using photosynthesis.
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Only the largest stars more than 10 times the size of the Sun will go
supernova and possibly become black holes.
O True
O Flase
which laboratory test examines physical and chemical properties to determine the presence of abnormal elements?
Urinalysis is the laboratory test examines which examines physical and chemical properties to determine the presence of abnormal elements.
Abnormal elements-Transitional chemical elements in which the filling of the orbitals by electrons occurs with a violation of the experimental series of an increase in the energy of orbitals.
Urinalysis, a portmanteau of the words urine and analysis, is a panel of medical tests that includes physical examination of the urine, chemical evaluation.A urinalysis is a test of your urine. It's used to detect and manage a wide range of disorders, such as urinary tract infections, kidney disease and diabetes. A urinalysis involves checking the appearance, concentration and content of urine.
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a radioactive element with two isotopes has been discovered on a planet with different physical laws than earth's. the isotope undergoes fission when bombarded with neutrons. however, one isotope of is far more abundant than the other. to separate it from , is first converted to , which is easily vaporized above room temperature. the mixture of and is then subjected to many stages of effusion. calculate how much more quickly effuses than . give the answer as the ratio of rates of to to four decimal places.
Two radioactive elements that naturally occur in the crust of the Earth are uranium and thorium. These two substances progressively alter over billions of years, yielding decay byproducts including radon and radium.
What substance is the most radioactive?Therefore, radium must have extremely high radioactivity. The radioactivity of this material exceeds that of uranium by a million times. It emits a faint blue glow due to its extreme radioactivity.
What makes an element radioactive?the causes of radioactivity in various elements (unstable). When an element's atoms include excess neutrons or protons, the extra energy produced in the nucleus leads to the unbalance or instability of the atom.
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If there are countless billions of stars and galaxies out there, then why does the night sky appear mostly black?
Answer:
Light pollution
Explanation:
Light pollution Is the artificial light from a variety of things-- commonly street lights and building lights that reflect on the sky; cities are a great example of this, and in most photos of cities barely if any stars are visible along with the sky being brighter in some places- that's actually the artificial light blocking out the stars and making the sky appear brighter. (the severity ranges from place to place)
Quote:
"What has happened to the stars?
Of course, they’re still there, but we can’t see them because of light pollution: the excessive and misdirected anthropogenic and artificial light that has invaded our night skies."
Conclusion:
The reason why the sky appears mostly black is light pollution, it not only covers the stars but sometimes makes the sky appear lighter than it should be-- on top of this light pollution has many other negative effects on the environment.
In which state of matter has the LEAST kinetic energy?
A gasgas
B liquidliquid
C solidsolid
D plasma
I think it's c I'm not sure
How long will it take before twenty percent of our 1000-gram sample of uranium-235 has decayed?.
It will take 226,572,993 years to decay If twenty percent of 1000 gram sample of uranium-235 has decayed.
This is calculated using the Decay equation. Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles The decay equation is,
A(t) = A0 e k.t
where t is the time for the decay, and K is the characteristic of the material. Suppose T is the time it takes for half of the unstable material in a sample of a radioactive substance to decay, called its half-life.
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Hydrogen, when combined with oxygen in a chemical reaction, forms water. this is an example of which type of chemical reaction?
Hydrogen, when combined with oxygen in a chemical reaction, forms water. this is an example of synthesis reaction.
2 H2(g) + O2(g) → 2 H2O(g)
A chemical reaction known as a synthesis reaction, also known as a direct combination reaction, occurs when two or more simple substances combine to create a more complex product. The product is always a compound, while the reactants can be either elements or other compounds. A synthesis reaction is characterized by the formation of a more complex product from the reactants. When two or more elements come together to form a compound, the synthesis reaction takes one simple form that is easy to recognize. The second kind of synthesis reaction takes place when an element and a compound come together to create a brand-new compound. Basically, find a product that includes all the reactant atoms to identify this reaction. Make sure to count the atoms in the reactants as well as the products.
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When the equation NaOH H2SO4 → is completed and balanced one of the products is ___?
When the equation NaOH + H2SO4 → is completed and balanced, one of the products is Sodium sulphate (NaSO4)
Sodium hydroxide reacts with sulphuric acid and has chemical formula is Naoh+h2so4 producing the product of (NaSO4+H2O) Sodium sulphate and water. This is an acid-base reaction and the product obtained is in the form of salt and water. Sodium sulphate is salt(product of neutralisation reaction).
Sodium hydroxide is an inorganic and strong base which is also known as caustic soda. The chemical formula of sodium hydroxide is NaOH and Sulphuric acid is strong acid with chemical formula H2So4.
When Both H2So4 and NaOH combine, the acid-base reaction will occur. Sodium hydroxide is a base that reacts with an acid, i.e., sulfuric acid to give respective salt and water as the product where Sodium sulphate is salt as a product . The reaction is an example of a neutralisation reaction.
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What metals do halogens react with?
All the alkali metals react vigorously with halogens to produce salts, the most industrially important of which are NaCl and KCl. Sodium Chloride is used as a preservative for meat and to melt the ice on the roads (via freezing point depression).
Reactions of halogens with metals
Let's now look at a few examples of reactions between halogens and metals. All of these reactions form salts. Again, the reactions are redox reactions and reactivity decreases as you move down the group.
Reaction with sodium
The halogens react vigorously with hot sodium metal to produce a sodium halide. They oxidise the sodium into Na(I) ions with a charge of +1. Sodium fluoride, chloride, bromide and iodide are all white solids.
Reaction with iron
Halogens can oxidise iron into iron(III) ions. The overall reaction produces an iron(III) halide. However, this reaction only happens with fluorine, chlorine and bromine – iodine isn't a potent enough oxidising agent for the reaction to occur.
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a regioselective reaction is one which?question 5 options:a single product is producemultiple products are made in equal amounts.
The option (c) is correct- multiple products are made with one in excess of the others.
What is regioselective reaction ?
Any mechanism that promotes bond formation at a specific atom over other potential atoms is said to be "regioselective." The term "regiochemistry" refers to the description of a reaction's regioselectivity (or lack thereof).
What is reaction ?
A chemical reaction involves the transformation of one or more chemicals, also known as reactants, into one or more additional substances, also known as products. Substances are composed of chemical components or chemical compounds.
Therefore, the option (c) is correct- multiple products are made with one in excess of the others.
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identify the statements that correctly describe the physical properties of organic compounds. multiple select question. organic compounds have lower melting points than ionic compounds. organic compounds have higher boiling points than ionic compounds. the intermolecular forces in organic molecules are much stronger than those found in ionic compounds. organic compounds are composed of covalent bonds.
Physical features of organic compounds substances are those that can be seen and measured. The melting point, boiling point, solubility, odor, and density are a few examples of physical qualities.
Which six physical characteristics do organic compounds possess?The six physical characteristics of organic molecules that scientists can notice include color, melting point, boiling point, solubility, physical state, or odor.
Which seven physical characteristics do organic compounds possess?In this lab, the following physical characteristics will be measured: solubility, density, melting point, boiling temperature, and refractive index. These physical characteristics may shed light on a substance's identity. The purity of a certain substance can also be ascertained using these similar characteristics.
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What group does bromine bond with?
All of the carbon in existence is continually recycled in the carbon cycle?
A. True
B. False
Answer:
True
Explanation:
All of the carbon in existence is continually recycled in the carbon cycle
All life on earth's uses Carbon compounds for basic biological processes so the answer is True
a 13.7 g sample of a compound exerts a pressure of 2.01 atm in a 0.750 l flask at 399k. what is the molar mass of the compound
The molar mass of the compound is 298 g/mol.
Define molar mass?
The mass of a sample of a chemical compound divided by the number of moles in the sample, measured in moles, is known as the molar mass of that compound.
Given:
Mass of sample = 13.7 g
Pressure P = 2.01 atm
Volume V = 0.750 L
Temperature T = 399 K
From the ideal gas equation,
PV = nRT
n = PV/RT
= 2.01 atm x 0.750 L / 0.0821 L-atm/mol-K x 399 K
= 0.04602 mol
It is calculated as,
Molar mass of the compound = mass /moles
= 13.7 g / 0.04602 mol
= 297.7 g/mol
= 298 g/mol
Therefore, the molar mass of the compound is = 298 g/mol.
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four u tubes each have distilled water in the right arm, a solution in the left arm, and a semipermeable membrane between arms.
We are aware that more charged particles should be present in the most concentrated solutions (for KCl, K+, and Cl-). The increased solute concentration draws the water in via osmosis.
As a result, the water level is lowest on the right side of the U-tube (C and D). However, the left side tube (A, B) has a more concentrated solution as compared to the right side tubes (C, D).
The result is that the tube B solution is the highest concentrated.
Describe osmosis.
Osmosis is the naturally occurring net movement of solvent molecules through a selectively permeable membrane in a direction that tends to balance the solute concentrations on the two sides, from a region of high water potential (region of lower solute concentration) to a region of higher water potential.
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We are aware that more charged particles should be present in the most concentrated solutions (for KCl, K+, and Cl-). The increased solute concentration draws the water in via osmosis.
As a result, the water level is lowest on the right side of the U-tube (C and D). However, the left side tube (A, B) has a more concentrated solution as compared to the right side tubes (C, D).
The result is that the tube B solution is the highest concentrated.
Describe osmosis.
Osmosis is the naturally occurring net movement of solvent molecules through a selectively permeable membrane in a direction that tends to balance the solute concentrations on the two sides, from a region of high water potential (region of lower solute concentration) to a region of higher water potential.
place the components of the electron‑transport chain to outline the flow of electrons from nadh to o2.
The electron transport chain consists of several protein complexes, which are typically arranged in the following order: NADH dehydrogenase,FADH2 dehydrogenase Complex I, Complex II, Complex III, Complex IV,ATP synthase, Cytochrome c oxidase.
NADH (nicotinamide adenine dinucleotide) donates its electrons to the first component of the electron transport chain, which is usually an enzyme called NADH dehydrogenase. The electrons are then passed from NADH dehydrogenase to the next component of the electron transport chain, which is typically an enzyme called flavin adenine dinucleotide (FADH2) dehydrogenase. The electrons are then passed from FADH2 dehydrogenase to a series of protein complexes known as the electron transport chain. These complexes, which are embedded in the inner membrane of the mitochondria, are called Complex I, Complex II, Complex III, and Complex IV. As the electrons pass through these complexes, they release energy, which is used to pump protons across the inner mitochondrial membrane. This creates a proton gradient, which is a concentration difference of protons on either side of the membrane. The protons then flow back through a protein called ATP synthase, which uses the energy of the flowing protons to produce ATP, the main source of energy for the cell. Finally, the electrons are passed to the final component of the electron transport chain, which is usually an enzyme called cytochrome c oxidase. This enzyme combines the electrons with oxygen to form water, completing the process of cellular respiration.
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atp is considered a high-energy molecule. when atp undergoes hydrolysis to adp, how much energy is produced?
A. 7.3 kcal/mole is required
B. 7.3 kcal/mole is released
C. 21.9 kcal/mol is released
D. 14.6 kcal/mole is released
ATP is considered a high-energy molecule. When ATP undergoes hydrolysis to ADP, 7.3 kcal/mol energy is produced.
ATP must continuously undergo replenishment to fuel the ever-working cell. The routine intracellular concentration of ATP is 1 to 10 uM.
What is hydrolysis?
Hydrolysis is a chemical reaction of the interaction of chemicals with water, which leads to the decomposition of both the substance and the water. Hydrolysis reactions are possible with salts, carbohydrates, proteins, fats, etc. Hydrolysis of organic substances in catabolic reactions usually takes place with the participation of enzymes.Proteins are divided into amino acids, fats into glycerol and fatty acids, and polysaccharides into monosaccharides.Hydrolysis disrupts the bond network in silicates and is therefore considered a fundamental step in the dissolution of silicate and aluminosilicate glasses, ceramics and minerals.To know more about hydrolysis reactions, click the link given below:
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What are three ways you can be exposed to chemicals?
The three ways by which we can be exposed to chemical are inhalation, Ingestion and skin contact.
As we know the Chemicals present in any laboratory can be present in any of the state among solid liquid and gas.
So, there are 3 ways by which we can be exposed to the chemicals.
The first one has by inhalation. When we directly inhales the gaseous Chemicals into our body.
The second is ingestion. When when we unknowingly ingest the Chemicals into our body, it is called ingestion of chemicals.
There are also some chemicals which can contaminate us by contact. This is called the skin contact exposure to chemicals.
Exposure to the chemical we should always use the safety precautions advised in the laboratories.
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HELPPPPPP QUICK!!!!!! the cell below. This cell is best described as a
The cell in the above image is best described as a prokaryotic cell because it has DNA in the cytoplasm and does not contain membrane-bound organelles (option C).
What is a prokaryotic cell?Prokaryotic cell is a cell having the characteristics of prokaryotes, especially bacteria. A prokaryote is an organism whose cell (or cells) are characterized by the absence of a nucleus or any other membrane-bound organelles.
Prokaryotic cells are single-celled microorganisms known to be the earliest on Earth. Prokaryotes include Bacteria and Archaea. The photosynthetic prokaryotes include cyanobacteria that perform photosynthesis.
Some of the characteristics of prokaryotic cells are as follows:
They lack a nuclear membrane.Mitochondria, Golgi bodies, chloroplast, and lysosomes are absent.The genetic material is present on a single chromosome.The histone proteins, the important constituents of eukaryotic chromosomes, are lacking in themAccording to this question, a cell is given in an image and presented to lack a nucleus, instead it possesses a region called nucleoid where it's DNA is located.
This suggests that the cell is prokaryotic because the DNA is not located in a nucleus.
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What is the identity of a 100.0 g sample of metal that, upon absorbing 4680 J of heat, increases in temperature by 52.0 °C? Metal Specific Heat Capacity J/(g.°c) Aluminum 0.90 Copper 0.38 Iron 0.45 Magnesium 1.00 Silver 0.23 Tin 0.32 Titanium 0.52 A) Mg B) AI C) Ti D) Fe
The metal is the Aluminium that has the 100.0 g sample of metal that, upon absorbing 4680 J of heat, increases in temperature by 52.0 °C.
We have a mass (m) of 100. g of an unknown steel that, while absorbs 4680 J of warmth (Q) will increase in temperature via way of means of 52.0°C (AT). The unique warmness capability (c) of the steel is the quantity of warmth required to elevate the temperature of the unit mass via way of means of the unit of temperature.
We can calculate it the usage of the subsequent expression.
c = Q/(m*Delta*T) = 4680J 100.g*52.0^ C = 0.900J/g.°CAluminum is the steel whose unique warmness capability is 0.900 J/g. °C.Aluminum is a steel that, in a 100. g pattern soaking up 4680 J of warmth will increase in temperature via way of means of 52.0 °C.Read more about heat capability here: https://brainly.com/question/22563191
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What is the total number of elements in group 17 that are gases at room temperature.
Two is the total number of elements in group 17 that are gases at room temperature: fluorine and chlorine.
What elements make up group 17?The chemical elements that make up group 17 of the periodic table are called halogens, which in the Greek language means salt former.
This group is made up of:
Fluorine (F)Chlorine (Cl)Bromine (Br)Iodine (I)Astatus (At)tenesus (Ts)Halogens in a gaseous stateThese elements are shown to have strong binding energy with other atoms but weak interactions with the diatomic fluorine molecule, which means that as one moves down the periodic table the element's reactivity decreases with increasing atom size.
The same happens with intermolecular binding energy, so fluorine and chlorine are the only elements in this group that are stable gases at room temperature.
Iodine is solid at room temperature, like bromine, but as soon as it gets slightly warm it melts and immediately evaporates into a thick, dense vapor, while astatine and tenesus are stable solids at room temperature.
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Is CH2O a covalent or ionic bond?
What are the 3 types of covalent bonds and examples?
Depending upon the number of shared electron pairs, the covalent bond can be classified into:
Single Covalent Bond.
Double Covalent Bond.
Triple Covalent Bond.
A covalent bond is formed by the equal sharing of electrons from both participating atoms.
A type of chemical relationship known as a covalent bond entails the sharing of electron pairs between atoms. The electrical attraction of their nuclei for the electrons is what causes the binding. It is in charge of squeezing the atoms together. day Covalent compounds are substances that display covalent bonding. In organic chemistry, covalent bonds are more frequent than ionic bonds. Another name for them is molecular bonding.
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a sample of gas isolated from unrefined petroleum contains 90.0% ch4, 8.9% c2h6, and 1.1% c3h8 at a total pressure of 307.2 kpa. what is the partial pressure of each component of this gas? (the percentages given indicate the percent of the total pressure that is due to each component.)
There are methods to calculate partial pressures: 1)Use PV = nRT the total pressure is 3.4 pKa.
Use the mole fraction of every fueloline to calculate the share of strain from the full strain assignable to every man or woman gasthis query the chances of 3 gases in a fueloline combination along side the full strain are given.
According to Dalton's law, general strain is the sum of partial pressures. The partial pressures then, may be calculated with the aid of using multiplication of the percents with the aid of using the full strain.
1-Partial strain of methane:
90.0100×307.2=276.5kPa
2- Partial strain of ethane:
8.9100×307.2=27.3kPa
3-Partial strain of propane:
1.1100×307.2=3.4kPa
The general strain is the sum of these 3 partial pressures.
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Which is the BEST question to find out whether an object has the right property for you to carry it in your backpack?
What does the object sound like?
What does the object taste like?
What is the color of the object?
What is the size of the object?
Answer: what is the size of the object
Explanation: then again though, i wouldn't carry something in my backpack that didn't taste good...