how many signals would you expect to find in the 13c nmr spectrum of the following compound? a) 2
b) 3
c) 4
d) 5
e) none of these

Answer:

Untreated water from rivers, lakes, ponds, springs, or streams is likely to contain unsafe levels of infectious microorganisms, and drinking it may cause illness.

Explanation:

A solution is not a pure substance as it is a mixture between a solute and a solvent.

Pure substances are substances that are made up of only type of particles and have a fixed structure. In pure substances the matter cannot be separated into other kinds of matter by any physical means.

A homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility. The term solution is commonly applied to the liquid state of matter, but solutions of gases and solids are possible.

A solution cannot be a pure substance because it is made up of a homogenous mixture of solute and a solvent. Homogenous means the matter cannot be separated out and therefore a solution cannot be a pure substance.

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Answer:D

Explanation:

Took the quiz

The 2 valence electrons in each atom of calcium this is a characteristic of calcium are most closely related to its chemical reactivity. Hence, option D is correct.

Calcium is a chemical element with the symbol of (Ca).an atomic number of calcium is 20.it is an alkaline earth metal. The atomic mass of calcium is 40.078 unit.

When metal atoms are reacts by losing they're losing their valence electrons. So, the reactivity of a metal depends on how easily its atoms lose valence electrons.

Calcium is a major mineral in our bones.

If you don’t get the right amount of calcium, you lose more bone strength.

The chemical reactivity of an element is dependent on its valence electrons and the distance of its valence electrons from the atomic nucleus.

The 2 valence electrons in each atom of calcium this is a characteristic of calcium is most closely related to its chemical reactivity. Hence, option D is correct.

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Phenol-formaldehyde is a thermoset polymer. Thermoset polymers can not be heated up and reused. Therefore it is not possible.

What is Polymer?

​The Greek word for "polymer" is "many pieces." Everywhere we look, we encounter polymers. From the strand of human DNA, a biopolymer that naturally occurs, to polypropylene, a material that is used all over the world.

Natural polymers are those found in plants and animals; synthetic polymers are those manufactured by humans (synthetic polymers). Due to their many distinctive physical and chemical characteristics, several polymers are used in daily life.

All polymers are produced by the process of polymerization, in which their component parts, known as monomers, combine with one another to form polymer chains, or 3-dimensional networks that form the links in polymers.

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Answer:

replacement

Explanation:

Because the No and The Ci switch but it might not be the answer but I know that they have to switch and replacement sounds like the best answer

Answer:

Oxidation

Explanation:

Hope this helps :)

HF Lewis structure is a polar due to the difference in electronegativity between hydrogen and fluorine atoms. This is due to permanent dipole moment, meaning that there is an uneven distribution of electrons within the molecule.

The HF (hydrogen fluoride) molecule has a polar covalent bond, which means that it has an uneven distribution of electrons between the two atoms.

In a polar covalent bond, one atom has a higher electronegativity than the other and therefore attracts the shared electrons more strongly, resulting in a partial negative charge on that atom and a partial positive charge on the other atom.

In the case of HF, fluorine has a higher electronegativity than hydrogen, which means that the electrons in the covalent bond are more strongly attracted to the fluorine atom. This results in a partial negative charge on the fluorine atom and a partial positive charge on the hydrogen atom.

Because the HF molecule has a polar covalent bond and the molecule has a bent shape due to the lone pair of electrons on fluorine, the molecule as a whole is also polar.

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A number is a mathematical entity that represents a physical property of a substance quantitatively. There are ten basic numbers such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 0. All other numbers can be obtained through the combination of these basic numbers.

Answer:

7.11 × 10²

Explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the

10. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

Answer:

plants process oxygen .human can breathe living ecosystem in wich you live

BOD = (14.8 - DO2) x 0.125 = 211.3 mg/LDO2 = 12.175 mg/LHence, the Biochemical Oxygen Demand (BOD) of the sample is 13.825 mg/L.

The given terms in the question are,211.3 mg/ LQ.6: 100 ml waste water sample was diluted with 800 ml of water. Initial dissolved oxygen level (DO:) was found to be 14.8 mg/1. After 5 days of incubation, the final dissolved oxygen level (DO) was found.In order to calculate the Biochemical Oxygen Demand (BOD) of a sample, the difference between the initial dissolved oxygen level (DO:) and the final dissolved oxygen level (DO) needs to be found.The formula for Biochemical Oxygen Demand is:Biochemical Oxygen Demand (BOD) = (Initial Dissolved Oxygen level) - (Final Dissolved Oxygen Level)BOD = DO1 - DO2BOD = 14.8 - DO2BOD = 14.8 - DO2.

To determine the value of DO2, first the dilution factor needs to be found.Dilution Factor = Volume of initial sample / Total VolumeDilution Factor = 100 / 800Dilution Factor = 0.125Since the initial sample was diluted by a factor of 0.125, the BOD can be calculated as follows:BOD = (DO1 - DO2) x Dilution Factor211.3 mg/L is the value of LQ, which is the conversion factor to convert milligrams per liter of oxygen to BOD value.

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Answer:

I think 7, 4, 6, or 8

I think that one of those is correct

Explanation:

The value of K_eq for this reaction is approximately 1.805 × 10^-5.

To find the value of the equilibrium constant (K_eq) for the given reaction, we can use the equilibrium concentrations of the species involved. The equilibrium constant expression for the reaction is:

K_eq = [CH3COO-][H3O+] / [CH3COOH]

Given the following concentrations at equilibrium:

[CH3COOH] = 2.0 × 10^-1 M

[CH3COO-] = 1.9 × 10^-3 M

[H3O+] = 1.9 × 10^-3 M

Substituting these values into the equilibrium constant expression, we get:

K_eq = (1.9 × 10^-3)(1.9 × 10^-3) / (2.0 × 10^-1)

K_eq = 3.61 × 10^-6 / 2.0 × 10^-1

K_eq = 3.61 × 10^-6 × 5.0 × 10^0

K_eq = 1.805 × 10^-5

Therefore, the value of K_eq for this reaction is approximately 1.805 × 10^-5.

None of the provided answer choices match this value exactly.

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The table has been attached below, describing if the given compounds sublime at STP.

Sublimation is a physical process in which a substance transitions directly from a solid to a gas without passing through the liquid phase. This occurs when the vapor pressure of the solid exceeds the atmospheric pressure. The opposite process, when a gas transitions directly to a solid, is called deposition. Sublimation is important in many areas of science and technology, including the purification of substances, the production of freeze-dried foods, and the creation of computer chips. It is also responsible for some unusual natural phenomena, such as the formation of snowflakes and the slow erosion of ice in cold, dry environments.

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Answer:  Assuming the question wants to know the mass of the same volumes of ice and water:  57.5 g for ice and 62.7 g for water/

Explanation:  The density of ice and water are 0.917 g/cm^3 and 1.99 g/cm^3, respectively.  1cm^3 = 1ml

(62.7 ml)*(0.917 g/cm^3) = 57.5 g for ice

(62.7 ml)*(1.99 g/cm^3) = 62.7 g for water

Answer:

72.2 ml

Explanation:

The neutralization equation between HBr (acid) and NaOH (base) is the following:

HBr(aq) + NaOH(aq) → NaBr(aq) + H₂O(l)

We can see that 1 mol of HBr reacts with 1 mol of NaOH. At the equivalence point, the total number of moles of HBr reacts with the total number of moles of NaOH. The number of moles can be calculated as the product between the molarity (M, in mol/L) and the volume (V). So, we can equal the quantities of acid and base, as follows:

moles HBr = moles NaOH

M(HBr) x V(HBr) = M(NaOH) x V(NaOH)

Now, we calculate the volume of NaOH with the data:

V(NaOH)= M(HBr) x V(HBr)/M(NaOH)

              = (2.60 mol/L x 50.0 ml)/(1.80 mol/L)

              =72.2 ml

iodine which should appear before tellurium and argon which should appear after potassium

There is a 3rd one: nickel should appear before cobalt

In appendix I of periodic table, the argon comes before potassium but comes before in the table. Similarly, cobalt has a mass greater than nickel but cobalt comes first in appendix.

Atomic mass is the mass of the atom measured relative to the carbon-12th element. The mass number of an atom  is the sum of its number of protons and neutrons. Along a period atomic mass increases slightly. Similarly down a group atomic mass increases.

The appendix 1 in periodic table list elements in the increasing order of atomic mass. However, some elements appears to be different from this order in the table which are argon and cobalt.

Argon comes before potassium but comes before in the table. Similarly, cobalt has a mass greater than nickel but cobalt comes first in appendix I. All other elements appears to be in the correct order of mass.

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Poêléing is the process of frying chicken in hot fat before wrapping it and baking it.

What is Poêléing?

In the dry-heat cooking technique known as poêléing, the food is cooked in its own juices in a covered pot, typically in the oven.

Poêléing is often referred to as butter roasting.

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The density of the solid is  6.724 g/ml.

Density is the number of factors which can be people, animals, vegetation, or objects in a sure place. To calculate density, you divide the number of objects by the dimension of the place. The populace density of a rustic is the wide variety of human beings in that us of a divided by means of the location in square kilometers or miles.

The density of an amount to being counted is its mass divided by means of its quantity. it also includes measured at zero °C and at 1 atmosphere of stress. Density is vital in figuring out the buoyancy of materials in fluids, as well as in evaluating materials and other measurements.

The density of an object is certainly one of its maximum crucial and easily-measured physical properties. Densities are extensively used to perceive natural substances and to represent and estimate the composition of many varieties of combos.

density = mass/ volume

      = 975g/145ml

      = 6.724 g/ml

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The increase in temperature causes the concentration of NO at equilibrium to increase because the reaction shifts to the left in order to relieve the stress caused by the increased temperature.

LeChâtelier's principle states that when a system at equilibrium is subjected to a stress, it will shift in a direction that tends to relieve that stress. In the case of the reaction of nitrogen monoxide (NO) with oxygen to form nitrogen dioxide (NO2), increasing the temperature is a stress that disturbs the equilibrium of the reaction.

At higher temperatures, the reaction will proceed more quickly due to the increased kinetic energy of the reacting species. This means that more NO2 will be formed, causing the concentration of NO2 to increase. According to LeChâtelier's principle, the reaction will shift to the left in order to relieve this stress and restore equilibrium. This means that the concentration of NO will increase, while the concentration of NO2 will decrease.

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The public view on gene editing vary between region and the purpose. Some thought that gene editing in babies make them intelligent and healthy. While some others believe as it is harmful.

Editing and coding in genetic sequences is to create desired characteristics is becoming common nowadays. The capacity of humans to modify DNA has been transformed by a new method known as Crispr.

Genetics is  trying to determine whether a certain development has actually occurred, may occur in the future, or is pure fiction. Additionally, the current study's gene-modification method appears to be relatively constrained.

The researchers were taken aback by this since they had put a DNA template into the embryo and anticipated that, as is the case with gene editing in other bodily cells, the gene would duplicate that sequence into the clipped location.

However, the embryonic genome disregarded that model, indicating that a healthy DNA sequence from the other parent is necessary to correct a mutation on one parent's gene in an embryo.

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Answer:

The third one from the left–the graduated cylinder.

Explanation:

The laboratory apparatus that gives an "accurate" or "precise" measurement of a liquid's volume is the graduated cylinder. All you have to do is to pour the liquid into the cylinder and read its measurement using the calibrated scale.

The graduated cylinder comes in different sizes, which means the scale divisions will depend on its size. When reading the measurement, it is important to take note to read at the bottom of the meniscus because it gives the most accurate volume.

Answer:

graduated cylinder

Explanation:

Answer: Bubbles, burning, odor, color change, and rusting.

Explanation: Chemical changes are changes to something that is irreversible.

The symbol [He] represents the electron configuration of a helium (He) atom. Helium has two electrons, and its electron configuration is 1s^2.

The [He] notation is used to indicate that the core electrons of the element being referred to have the same electron configuration as a helium atom.

In the case of [He], it implies that all electrons in the 1s orbital are considered core electrons. Core electrons are the electrons that are closest to the nucleus and are not involved in chemical bonding or interactions with other atoms. They are generally not shown in chemical equations or reactions as they do not participate in the chemical behavior of an element.

So, the symbol [He] implies that the core electrons include the two electrons in the 1s orbital of the element being described.

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Answer:

0.3M

Explanation:

Find the amount concentration of the anion in a 0.100 mol/L solution of Al(CIO3)3.

FOR EVERY MOLE OF Al(CIO3)3., THERE ARE 3 MOLES OF CIO3.

SO IN A 0.00m SOLUTION, THE CONCENTRATION OF THE ANION

ClO3 IS 3X0.1M = 0.3M

.

Answer:

7.8

Explanation:

pH + pOH = 14

pOH = 14 - 6.2

= 7.8

The volumetric flask should contain the prepared solution after it has been made.

My focus is being disrupted by all the commotion. 1a: the act or process of concentrating: the state of being concentrated especially: direction of attention to a single thing The student decided to focus on law as his academic major or area of interest.

23.5ml of the 458 mol L-1 solution

The moles per liter unit is used to express the solution concentrations. Consequently, change the volume of the volumetric flask's unit to liters as follows:

23.5ml

=23.5ml * 1L/10 ML

Convert the unit of the required stock solution to milliliters:

6.40* 10-3 L * 10 ml/1L = 6.40 ml

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The probability of occupying the second energy level in an energy diagram of two energy levels, one at 0 cm-1 and one at 300 cm-1, will be 0.15 when the temperature is 874 K (600°C)

We can write the formula as, Substituting the values: E2 - E1 = 300 cm-1 (which equals to 3 × 104 m-1 or 3.96 × 10-19 J).Then the probability of occupying the second level be 0.15 when the temperature is 874 K (600°C).

If two particles are in the second energy level, then the temperature will be higher than in case a. This is because having two particles in the second energy level (instead of none) indicates that there is an external source of energy that has raised the temperature of the system, since at lower temperatures, particles will occupy the lowest possible energy level.

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mmg mmñm

Explanation:

no lo seeee123456789

Answer:

NO

The mass number of an atom is the total number of protons and neutrons it contains. The mass number of an atom is never smaller than the atomic number.

EXPLANATION:-

The atomic number is always a lesser value than the mass number. The mass number is always a greater value than the atomic number. Atoms are made of electrons, protons, and neutrons. Protons and neutrons together form the nucleus of an atom

Atomic number = number of proton/number of electron

mass number = number of proton + number of Neutron

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