What molecules are found in all or almost all organic compounds?
a. Carbon and oxygen
b. Hydrogen and oxygen
C.
Carbon and nitrogen
d. Carbon and hydrogen
Please select the best answer from the choices provided
Ο Α
OB
O C
OD

The percent yield of KOH is 78.7%.

Balanced chemical reaction:

4KO₂ + 2H₂O → 4KOH +3O₂

m(KO₂) = 22.4 g; mass of the oxide

m1(KOH) = 13.9 g; mass of the potassium hydroxide produced

n(KO₂) = 22.4 g ÷ 71.1 g/mol

n(KO₂) = 0.315 mol; amount of the oxide

From chemical reaction: n(KO₂) : n(KOH) = 1 : 1

n(KOH) = 0.315 mol; amount of the potassium hydroxide

m(KOH) = 0.315 mol x 56.1 g/mol

m(KOH) = 17.67 g; a theoretical yield of KOH

the percent yield = 13.9 g / 17.67 g x 100%

the percent yield = 78.7%

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An oxygen molecule at 25◦C has a speed of 1520 miles/hour.

As we know

1 km = 1000 meter

So,

678  / 1000 = 0.678 km

And 1 mile = 1.6 km

So,

0.678 / 1.609 = 0.4213 miles

We know that 1 hour = 60×60 = 3600 sec

So,

1 sec = 1 / 3600

= 2.777 x 10⁻⁴ hour

Now finding speed,

speed = distance / time

speed = 0.4213 / 2.777 x 10⁻⁴

speed = 1520 miles/hour

Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path. In other words velocity is a vector value, whereas speed is a scalar value.

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During the breakdown of fatty acids, not all acetyl CoA enters the citric acid cycle, and your body converts some acetyl CoA to ketone bodies.

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.

Blood is normally slightly alkaline, with a normal pH range of about 7.35 to 7.45. Normally, the body keeps blood pH near 7.40. Doctors measure a person's acid-base balance by measuring the pH of the blood and the levels of carbon dioxide (acid) and bicarbonate (base). No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether.

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The person will live  73.62 years

The heartbeats 80 times in 1 minute

Therefore , 1 heartbeat takes [tex]1/80 minutes[/tex] time

In whole life number of heartbeats = [tex]3.1* 10^{9}[/tex]

Thus, time in which [tex]3.1* 10^{9}[/tex] heart beat will occur = [tex]3.1* 10^{9} * 1/80 minutes[/tex]

                                                                                  = [tex]0.03875 * 10^{9}[/tex] minutes

Since 1 minutes =[tex]1.90259 * 10^{-6}[/tex] year

Therefore,  [tex]0.3875 * 10^{9}[/tex] minutes = [tex]0.03875 * 10^{9}[/tex] * [tex]1.90259 * 10^{-6}[/tex] year

                                                     = [tex].073625* 10^3[/tex] years

                                                     = 73.62 years

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A chemist tests the quality of a brand of soft drink. The branch of chemistry he might use out of Analytical chemistry, physical chemistry, biochemistry, organic chemistry, and inorganic chemistry is analytical chemistry.

What are the branches of chemistry?

Analytical chemistry, physical chemistry, biochemistry, organic chemistry, and inorganic chemistry are thought to constitute the five main branches. The study of compounds of carbon and itself is called organic chemistry. The study of substances not included in organic chemistry is known as inorganic chemistry. The study of matter's chemistry and the creation of instruments to quantify matter's properties are both aspects of analytical chemistry. The field of chemistry known as "physical chemistry" uses physics to the study of chemical reactions. This often involves using thermodynamics and quantum mechanics to research chemistry. The study of chemical reactions that take place within living things is known as biochemistry.

Thus, the branch of chemistry a chemist uses to test the quality of a brand of soft drink is analytical chemistry.

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The foreign substance responsible for causing an allergic reaction is called an allergen.

The exaggerated reaction of our body’s immune system to certain foreign substances is known as an allergy.

The symptoms of allergy are sneezing, watery eyes, running nose, and difficulty in breathing which occur due to the release of certain chemicals like histamine and serotonin in our body.

The foreign substance that causes allergy is called an allergen.

Common examples of the allergens are pollen grains of certain plants, animal dander, and food items like peanuts, mushrooms etc.

To control the symptoms of allergy, drugs like antihistamines and steroids are used.

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Acetylcholine binds to receptors on muscle fibers which open ion channels (allowing ions to move along their concentration gradient). This is an example of passive transport.

Passive transport is a  biological phenomenon of movement that does not require external energy from the cell. It is the movement of ions or other chemical substances within the cells.

This movement happens along the concentration gradient. The chemical substance moves from high concentration to low in this phenomenon. simple and facilitated diffusion that happens in the cell are also types of passive transport. Other than that, passive transport also includes Filtration and Osmosis.

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Among the pair of elements given, Cl and F are expected to be the most similar.

On the basis of periodic table,

Cl and F are in the same group which is the halogen group. Thus, they possess similar properties.Of the choices provided, Chlorine (Cl) and Fluorine (F) are the only pair located in the same group while the others belong to different groups in periodic table.

Nitrogen have symbol N and belongs to main group element while Nickel have symbol Ni and belong to transition element. Therefore, they are not similar.

Molybdenum have symbol Mo belongs to transition element and Tin have symbol Sn belongs to main group element possessing different properties.

Sodium have symbol Na and classified as alkali metal while Magnesium have symbol Mg, classified as alkaline earth metals. They do no have similar properties.

Silicon having symbol Si is a metalloid while Phosphorus having symbol P is a non-metal. Thus, they are not similar.

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Best carbon-14 radioisotope-labeled compound to add to a cell culture as a means for tracking the products of transcription 14C ribose.

Carbon-14, the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts. C-14 is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.it is mostly found in atmospheric carbon dioxide because that is where it is constantly being produced by collisions between nitrogen atoms and cosmic rays.

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Carbon (C) contains the largest number of moles.

Number of Moles of a substance can be defined as the ratio of given mass of the substance to the Molecular Mass of the substance.

We can write,

Number of moles = Given Mass / Molecular Mass                euation1

Given Mass of Na, C, Pb, Cu, Ne each = 10.0g

Molecular mass of Na = 22.9898 u

Molecular mass of C = 12u

Molecular mass of Pb = 207.2u

Molecular mass of Cu = 63.546 u

Molecular mass of Ne = 20.1797 u

After substituting the values of molecular mass and given mass of elements in equation1 , we will get

Number of moles of Na = (10/22.9898) = 0.4350

Number of moles of C = (10/12) = 0.8333

Number of moles of Pb = (10/207.2) = 0.0483

Number of moles of Cu = (10/63.546) = 0.1574

Number of moles of Ne = (10/20.1797) = 0.4955

So, we can clearly see that Carbon contains the largest number of moles.

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3 structural isomers can be drawn to represent the chemical formula C5H12.

When two or more organic compounds have the same molecular formula but different structures, they are said to be structural isomers, also referred to as constitutional isomers. The two molecules below share the same chemical formula, however they are distinct due to variations in the methyl group's placement.

It is an alkane, C5H12. There are 2 to the power (n-4)+1 isomers of an alkane, where n is the number of carbon atoms. Therefore, there are three structural isomers that might exist for C5H12 using the formula. They are methyl butane, n-pentane, and isopentane (dimethyl propane).

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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

Explanation:

The degree of deflection directly relates to the mass of the ion: the lighter the ion, the greater the deflection and the heavier the ion, the lesser the deflection. The beam of ions is then detected

and the relative abundance of each isotope of an element canthen be determined.

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The greater the mass of the isotope lesser will be the amount of deflection. The amount of deflection is related to the mass of the isotope.

An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties.

As each isotope has a different mass number, this number is written after the element name for the atom. For example, an atom of carbon with a mass number of 12 will be labeled as an atom of carbon-12. Carbon-13 and carbon -14 is also examples of carbon atom.

Thus, the greater the mass of the isotope lesser will be the amount of deflection. Deflection is depend upon the mass of atom.

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Answer:

It is an alkene

Explanation:

First, this is a hydrocarbon because it has only carbons and hydrogens.  Second, we see the C=C which is a double bond.  Double bonds between carbons make it an alkene.

About a century ago, in 1911, Rutherford discovered the atomic nucleus, then in 1919, he witnessed the proton.

For a long time, people believed that Atom was the final particle and the building block of every other component in the universe. However, in the year 1911, Rutherford's atomic model depicting the presence of nucleus shattered the argument that atom is the ultimate unbreakable particle.

Rutherford's experiment also approved that there must be more than just protons in the nucleus. For example, it was previously known that helium had an atomic number of 2, but a mass number of 4.

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The mass of nitrogen contained in 70.0 g of C6H5NO3 is 7.05g.

The mass of an element in a compound can be calculated by dividing the molar mass of the element by the molar mass of the compound multiplied by the mass of the compound.

According to this question, 70.0 g of C6H5NO3 is contained in a substance.

Molar mass of nitrogen is 14g/mol

Mass of nitrogen = 14g/mol/139.11g/mol × 70g

mass of nitrogen = 7.05g

Therefore, the mass of nitrogen contained in 70.0 g of C6H5NO3 is 7.05g.

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Answer:

conductor

Explanation:

Ionic compounds are formed from ionic bonds which occur when there is electron transfer, while covalent compounds share electrons. Hence, the answer is true.

Covalent compounds are compounds formed by covalent bonds. Atoms form compounds to achieve a stable electronic configuration. Covalent compounds do this by sharing their electrons. Covalent bonds are weaker than ionic compounds and mostly form gases.

Ionic compounds achieve the stable electronic configuration of noble gases by gaining or giving away their electrons. When this happens, the atoms get attracted to each other by electrostatic forces. Atoms that give away their electrons become positively charged cations and atoms that receive electrons become negatively charged anions.

Therefore, the major difference between ionic compounds and covalent compounds is that covalent compounds share electrons and ionic compounds transfer electrons.

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The anhydrous cobalt chloride is blue in color and it absorbs water, on reaction with water it turns pink in color.

A chemical reaction is defined as a process that lead to chemical transformation of one set of substances to another set.

There are basically four types of chemical reactions.

The reaction between anhydrous cobalt chloride and water is also one of the chemical reaction.

Thus, anhydrous cobalt chloride is blue in color and it absorbs water, on reaction with water it turns pink in color.

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A 0.50-quart jar contains 2.0 pounds of honey.  1.9 g/ml is the density of the honey.

Population density (in agriculture, forest stand, or plant density) is a measure of population per unit area or, exceptionally, per unit volume. It is a quantity of type number density. It applies to living things in general, mainly humans. It's an important geographical term.  Simply put, population density is the number of people living per square kilometer.

Urban populations, especially urban areas, strongly depend on the definition of "urban area" used. It is almost always denser only in the center than when it includes suburban settlements and intervening rural areas, such as agglomerations and metropolitan areas. Area (the latter may include neighboring cities).

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The bonds that are present in the pictured compound are C −C and C −H.

A bond is that which connects two atoms together. We know that a compound is composed of bonds. There are a number of bonds in a compound. The bonds are always as many as the atoms that need to be linked in the compound.

We know that butane a shown in the image is an alkane. An alkane has carbon - carbon and hydrogen - carbon bonds. There are no multiple bonds in the compound butane.

Thus, the bonds that are present in the pictured compound are C −C and C −H.

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In the experiment performed on the compost:

Variables in an experiment are factors that are under the control of the researcher and which brings about changes in the result of the experiment.

There are three types of variables in an experiment, they are;

The independent variable is the variable which affects the result of the experiment by controlling the dependent variable.

The dependent variable changes as a result of changes in the independent variable.

The constant variable is kept constant or unchanged by the researcher.

Considering the experiment performed on the compost:

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The two properties of the atomic structure of copper that make it a good conductor is:

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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The reaction best illustrates the behavior of the weak base h₂po₄- in an solution is:H₂PO₄ (aq) + H₂O (l) ↔ H₃PO₄ (aq) + OH- (aq)

What is a weak base?

A weak base is a base that, upon dissolution in water, doesn't dissociate completely, therefore the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical and a large proportion of undissociated molecules of the base.

Contents 1 pH, Kb, and Kw 2 Percentage protonated 3 A typical pH problem.

Examples of Weak Bases.

Ammonia (NH₃) Ammonia could also be a chemical compound with the formula NH ₃. it is a weak base which exists as a colour less gas under standard conditions for ...

2 Trimethylamine (N (CH₃) ₃)₃ Pyridine

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A singlet, a triplet, and a quartet multiplicities are observed for the signals in the off-resonance decoupled 13c NMR spectrum of 2-chloropropene.

A phenomenon in which an external force or vibrating system causes another system around it to vibrate with greater amplitude at a particular operating frequency. The concept of resonance would be difficult to understand without an example. The resonance energy is defined as the difference between the electronic energy of the real (conjugated) molecule and the virtual Kekulé structure in which the bond is localized.

Resonance occurs when the frequency of the applied force is equal to one of the natural frequencies of vibration of the forced or driven harmonic oscillator. Swings, guitars, pendulums, bridges, and musical systems are examples of resonance in everyday life.

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Explanation:

Using the law of the conservation of linear momentum P:

P_i = P_fP

i

=P

f

so:

M_mV_{mi}+M_pV_{pi} = M_sV_sM

m

V

mi

+M

p

V

pi

=M

s

V

s

where M_mM

m

is the mass of the man, V_{mi}V

mi

is the initial velocity of the man, M_pM

p

is the mass of the puck, V_{pi}V

pi

is the initial velocity of the puck, M_sM

s

is the mass of the puck and the man and V_sV

s

is the velocity of both after the collition.

Replacing values, we get:

(80kg)(0m/s)+(0.17kg)(20m/s) = (80kg + 0.17kg)V_s(80kg)(0m/s)+(0.17kg)(20m/s)=(80kg+0.17kg)V

s

Finally, solving for V_sV

s

:

V_sV

s

=0.0424m/s

Nitrogen gas is the major component of air. a sample of nitrogen gas in a glass bulb weighs 243 mg. 2.43 × 10-4 kg is this mass in si base units of mass (kilograms).

Nitrogen, or N, using its scientific abbreviation, is a colorless, odorless element. Nitrogen is in the ground under our feet, in the water we drink, and in the air, we breathe. In fact, nitrogen is the most abundant element in the Earth's atmosphere, with approximately 78% of the atmosphere being composed of nitrogen.

Nitrogen is commonly used during sample preparation for chemical analysis. Used to concentrate and reduce the volume of liquid samples. Nitrogen is also important for the chemical industry. It is used in the production of fertilizers, nitric acid, nylon, dyes, and explosives*. Exposure to very high concentrations of pure nitrogen can cause dizziness, drowsiness, displacing oxygen from the air, unconsciousness, and death.

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The frequency of a photon with a wavelength of 360 nm frequency of a photon is 8.33 × 10¹⁴ s⁻¹.

Given,

The wavelength of photon = 360 nm or 3.60 × 10⁻⁷

three × 10⁸ m/s is the speed of mild.

We need to discover the frequency of a given photon.

The frequency of a photon is described as the wide variety of waves that pass via a set point in a unit of time.

therefore, f = c/λ

where f is the frequency, c is the velocity of light, and λ is the wavelength of the photon.

f = 3 × 10⁸/ 3.60 × 10⁻⁷

Or, f = 0.8333 × 10¹⁵ s⁻¹

Or, f = 8.33 × 10¹⁴ s⁻¹

Hence, the frequency of the photon is 8.33 × 10¹⁴ s⁻¹.

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Polar covalent bonds are the type of covalent bond found between oxygen and hydrogen in water molecules

Water is a Polar Covalent Molecule

The choppy distribution of electrons among atoms and the uneven form of the molecule way that the water molecule has poles - a superb price at the hydrogen pole (side) and an oxygen Negative price at the poles (flanks)).

A water molecule includes hydrogen atoms covalently bonded to the equal oxygen atom. Oxygen atoms are electronegative and entice covalent electrons in covalent bonds.

The bond among the oxygen and hydrogen atoms withinside the water molecule is a polar covalent bond. H. Electrons aren't shared similarly among oxygen and hydrogen. Oxygen has a better affinity for electrons than hydrogen.

A polar covalent bond is a bond wherein the electron pairs are shared similarly among the 2 bonding atoms, and a polar covalent bond is a bond wherein the electron pairs are shared unequally among the 2 bonding atoms. Polar bonds are a result of variations in electronegativity.

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Scientific investigations can be used to reach the solution to the problem. The hypothesis of the experiments can be performed and the results and findings should be reported. Thus, option A is correct.

Scientific investigations have been defined as the series of steps that are used to solve the question and test the hypothesis to reach the solution. It uses logical means to experiment and research the topic.

After conducting an experiment the observed data, results, and findings must be reported so the process and the technical results can be used to define the issue or the problem that acts as a conclusion.

Therefore, option A. Rick must report his findings.

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Your question is incomplete, but most probably your options were,

A. Report his findings.

B. Throw away his experiment notes.

C. Report that squid swims faster in warm water.

D. Change his hypothesis.