This is a steel penny from 1943. A steel penny will weigh 2.72 g and is
magnetic. This penny weighs 2.74 grams and sticks to a magnet. Therefore,
this is likely a steel penny. Identify the RULE in this claim, evidence and
reasoning

Explanation:

Melting is defined as the physical process where a solid state of a substance converts into its liquid state. No change of chemical composition takes place, just the physical state of water is changing.

\(\text{Solid}\rightleftharpoons \text{Liquid}\)

There are given carboxylic acids. The melting point of these acids increases to its second group member which is ethanoic acid due to prevalent hydrogen bonding. To break this bonding, a high amount of heat needs to be applied.

But as we move forward, the melting point decreases sharply as an increase in the number of carbon atoms decreases the hydrogen bonding.

Melting point of Formic Acid = \(8.3^oC\)

Melting point of Acetic Acid = \(16.6^oC\)

Melting point of Propionic Acid = \(-21^oC\)

Answer:

The energy of a ruby laser that produces red light with a wavelength of 5.00 × 10^-7 m is 3.98 × 10^-19 J.

Explanation:

The energy of a photon is given by the formula E = hf where h is Planck’s constant and f is the frequency of the photon. The frequency of the photon can be calculated using the formula f = c/λ where c is the speed of light and λ is the wavelength of the photon.

Substituting the given values, we get:

f = c/λ = 3.00 × 10^8 m/s / 5.00 × 10^-7 m = 6.00 × 10^14 Hz

E = hf = (6.626 × 10^-34 J s) × (6.00 × 10^14 Hz) = 3.98 × 10^-19 J

Therefore, the energy of a ruby laser that produces red light with a wavelength of 5.00 × 10^-7 m is 3.98 × 10^-19 J.

Hello again!! :)

The SN2 reaction proceeds most quickly for primary carbons and there's less steric congestion for all of this backside assault.

Secondary as well as tertiary alkyl halides undergo the SN2 reaction more slowly than primary alkyl halides. Since there were only three little hydrogen atoms present, methyl halides interact in SN2 reactions the fastest among the simple alkyl halides.

Due to the fact that tertiary carbocations comprise three alkyl groups and secondary carbocations only have two, the former is more stable. Based on the inductive effect, tertiary carbocation is therefore more stable that secondary carbocation.

To know more about SN2 reaction

https://brainly.com/question/14587555

#SPJ4

Answer:

A. Coccolithophores

Explanation:

Coccolithophores are organisms that are single-celled, and secret calcium carbonate plates. They produce calcium carbonate plates that is referred to as coccoliths.

These organisms absorb carbon dioxide during the production of their food. After its death, the calcium carbonate can be collected from the remains. Therefore causing an increase generally in the carbon deposits.

Answer:

A. Coccolithophores

Explanation:

Coccolithophores Create a calcium carbonate plating that protects the cell's surface. This action is called spherical coating.

Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.

For such more question on valence electrons

https://brainly.com/question/371590

#SPJ8

Answer:

thunderstorms

Explanation:

Answer:the term 'atom' in chemistry represents the basic unit of matter that normally exists in a free state and contains all chemical properties. It is an infinite particle that clearly identifies a chemical element. It consists of a positively charged nucleus and is surrounded by negatively charged electrons.

An ion or charge is an atom or group of atoms that has lost or gained one or more electrons. An ion that has a negative charge, when it gains one or more electrons, is called an anion or negative charge, and an ion that has a positive charge when it loses one or more electrons, is called a cation or positive charge.

Explanation:

Explanation:

the answers must help you I made this presentation for you

Gradually graduated cylinders are available in a variety of sizes, or volume capacities, and, like a measuring cup, are used to determine volume by pouring liquid to the cylinder and comparing the liquid level to the graduated scale.

The volume that was measured is the same as the amount of liquid that was put inside the cylinder.

Similar to weighing, determining the volume of a liquid is a fundamental and common lab procedure. Both a graduated cylinder and a burette are commonly used to measure liquid volume.

A graded cylinder is, as its name suggests, a cylindrical glass or plastic tube that is sealed at one end and has a calibrated scale etched (or marked) on its exterior.

Gradually graduated cylinders are available in a variety of sizes, or volume capacities, and, like a measuring cup, are used to determine volume by pouring liquid to the cylinder and comparing the liquid level to the graduated scale.

The volume that was measured is the same as the amount of liquid that was put inside the cylinder. As a result, the graduated cylinder and similar apparatus (volumetric flasks, Erlenmeyer flasks, and beakers) are categorized as to-contain (TC) apparatus.

To Learn more About graduated cylinders refer To:

brainly.com/question/24869562

#SPJ1

Phenolphthalein is an indicator commonly used in acid-base titrations to determine the endpoint of the reaction. It is colorless in acidic solutions but turns pink or purple in basic solutions.

In the neutralization reaction between hydrochloric acid (HCl) and calcium hydroxide (Ca(OH)₂), the acid and base react to form water (H₂O) and calcium chloride (CaCl2). The balanced chemical equation for this reaction is: 2HCl(aq) + Ca(OH)₂(aq) → CaCl₂(aq) + 2H₂O(l)

Since calcium hydroxide is a strong base and hydrochloric acid is a strong acid, the reaction will be complete and the resulting solution will be neutral. Therefore, we expect to see the pink or purple color of phenolphthalein indicator when the student adds just enough calcium hydroxide to completely neutralize the acid and form a neutral solution.

To learn more about Phenolphthalein here:

https://brainly.com/question/14804470

#SPJ1

The amount remaining after 36 years is 5 g

n = t / t½

n = 36 / 12

n = 3

N = N₀ / 2ⁿ

N = 40 / 2³

N = 40 / 8

N = 5 g

Therefore, the amount remaining after 36 years is 5 g

Learn more about half life:

https://brainly.com/question/26374513

To solve such this we must know the concept of chemical reaction. Therefore, in a chemical change, different  materials are formed that are different from the starting materials.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.

There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. Chemical reaction is a chemical process in which different materials are formed that are different from the starting materials.

Therefore, in a chemical change, different  materials are formed that are different from the starting materials.

Learn more about the chemical reactions, here:

brainly.com/question/3461108

#SPJ1

Answer:

Peroxide is a polyatomic ion consisting of two bonded oxygen atoms. This ion can form a compound with another atom,one of which is hydrogen Peroxide.

Typically two oxygen atoms make a neutral compound, which is oxygen gas. Peroxide can be written as 0-22

True. The bonds found within hair that help organize protein chains in order to build hair are called side bonds. These bonds include hydrogen bonds, salt bonds, and disulfide bonds.

Hydrogen bonds are weak and are easily broken by water or heat, which is why hair can be easily manipulated when wet or exposed to heat. Salt bonds are also relatively weak and can be disrupted by changes in pH levels, which is why some hair products contain ingredients that help balance pH levels to maintain the strength of salt bonds. Disulfide bonds, on the other hand, are strong and provide the backbone of the hair's structure. They can only be broken by chemical treatments such as perming or relaxing. Understanding the different types of bonds within hair is important for hair care professionals as it helps them to properly diagnose hair damage and recommend appropriate treatments. It also helps individuals to choose the right products for their hair type and to properly care for their hair to maintain its health and strength.
True. The bonds found within hair that help organize protein chains in order to build hair are called side bonds. These side bonds connect the individual protein chains and are crucial in maintaining the hair's strength and structure. There are three types of side bonds: hydrogen bonds, salt bonds, and disulfide bonds. Each bond plays a specific role in determining the hair's overall structure and properties.

For more information on Hydrogen bonds visit:

brainly.com/question/30885458

#SPJ11

Blood pressure may rise as a result of sodium bicarbonate. Avoid sodium bicarbonate if you already have high blood pressure.

Baking soda can be lethal if consumed in excess. The powder's high sodium concentration is to blame for this. When someone consumes an excessive amount of sodium bicarbonate, their body will attempt to restore the proper level of salt by bringing water into their digestive tract. Vomiting and diarrhea are brought on by this.

The body requires bicarbonate, a chemical known as a base, to help maintain a healthy acid-base (pH) balance. This equilibrium keeps your body from becoming overly acidic, which can lead to a variety of health issues. The kidneys and lungs remove extra acid from the blood, maintaining a normal blood pH.

Read more about sodium bicarbonate at

https://brainly.com/question/8560563

#SPJ4

The atomic radius of Argon is smaller than the atomic radius of sodium because the effective nuclear charge increases as we move left to right in a period.

The atomic radius can be described as the shortest distance between the center of the nucleus of the atom and the outermost shell of the atom. An atomic radius can also be defined as half the distance between two atoms of the same element bonded together.

In general, the atomic radius of an atom reduces as we move from left to right in a period on the periodic table because while moving from left to right in a period, there is an increase in the effective nuclear charge. In periods, the valence electrons enter in the same outermost shell.

The atomic radius of atom increases when we move down a group because of the addition of a new principle shell.

Sodium is present at beginning of the third period and the Argon is present at the end of the same period. Therefore, Argon experiences a more effective nuclear charge than sodium so it has a smaller atomic radius.

Learn more about atomic radius, here:

brainly.com/question/14544878

#SPJ5

Answer:

c lined with aluminum foil

Answer: 0.44

Explanation:

The specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0°C is 0.44J/g°C.

The specific heat capacity of a substance can be calculated using the following formula:

Q = m × c × ∆T

Where;

985 = 158.5 × c × (24°C - 10°C)

985 = 2219c

c = 985/2219

c = 0.44 J/g°C

Therefore, the specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0°C is 0.44J/g°C.

Learn more about specific heat capacity at: https://brainly.com/question/1747943

#SPJ2

Answer:

347.6995462

Phosphorus heptasulfide, free from yellow and white phosphorus appears as light-yellow crystals, light-gray powder, or fused solid. Melting point 310°C.

...

Answer:

The correct answer is option D

Explanation:

The enzyme enolase is categorized as a metalloenzyme that carries out the catalytic reaction of 2-phosphoglycerate to phosphoenolpyruvate conversion. Several kinetic and spectroscopic methods have been applied to study the role of the divalent metal ions Mg+2 (magnesium ions) involved in the reaction. Both the ions have been shown to coordinate with the carboxylic group of the substrate and product. The coordination provides stability to the intermediate steps in the general base catalysis of enolase (proton abstraction by a base), thereby providing maximum activity to the dimeric molecule.

The enzyme is a molecule that acts as a catalyst while the ions are supposed to facilitate the action of the enzyme. So, option a and b are incorrect. In the reaction, the proton abstraction takes place by a base, not an acid and so, option C is incorrect. The transition state and the intermediate steps are stabilized which facilitates the base catalysis and so, option E is incorrect.

Answer: To facilitate  general base catalysis. Thus option D is correct.

Explanation:

Enolase enzyme is classified as a metalloenzyme that performs the catalytic reaction of converting 2-phosphoglycerate to phosphoenolpyruvate. Various kinetic and spectroscopic methods were used to investigate the role of the divalent Mg+2 metal ions (magnesium ions) involved in the reaction. Both ions were shown to coordinate to the carboxyl group of the substrate and the product. The coordination ensures the stability of the intermediate steps in the general base catalysis of enolase(extraction of the proton by the base) and thus the maximum activity of the dimeric molecule.

An enzyme is a molecule that acts as a catalyst, while ions are believed to facilitate the action of the enzyme .Therefore, options a and b are invalid. The reaction involves the extraction of the proton from the base, not the acid, so option C is incorrect. The transition state and intermediate phases are stabilized, facilitating base catalysis, so option E is wrong.

Answer:

1) Salts X and Y

2) The solubility of the salts

3) a) The solvent

b) The solvent temperature

Explanation:

1) The independent variable is the variable that is suspected to be the cause of the subject of the investigation

The given investigation is meant to investigate the solubility of different salts

Therefore, the solubility is expected to be dependent on the type of salt, and the independent variable is the type of salt, X or Y

2) The dependent variable is the effect meant to be observed in the investigation, which is the solubility of the salt in water at room temperature

3) The control variables are the variables which are held constant during the investigation, including;

a) The solvent used if the investigation; water

b) The temperature of the solvent; Room temperature

Answer:

56 %

Explanation:

The percent dissociation of a weak acid can be defined as:

Moles of weak acid that produced H₃O⁺ species / Total number of weak acid moles * 100%

We are given all the required data to calculate the percent dissociation:

0.42 mol / 0.75 mol * 100 % = 56 %

The percent dissociation is 56%.

The calculated molar ratio of iron to oxygen in BIFs is 1.452.

Comparing this ratio to the molar ratios of Hematite (1:0.75) and Magnetite (1:0.67), we can see that the calculated value of 1.452 is closest to the Hematite molar ratio of 1:0.75. Therefore, Hematite is the more dominant iron component in BIFs.

To calculate the mass of oxygen contained within BIFs, we'll use the given information:

Total mass of the modern atmosphere = 5.01×10¹⁸ kg

Percentage of oxygen in the modern atmosphere = 21%

Mass of oxygen contained within the modern atmosphere = (5.01×10¹⁸ kg) × (0.21) = 1.051×10¹⁸ kg

Percentage of oxygen contained in BIFs = 6.6% (given)

Mass of oxygen contained within BIFs = (6.6% of 1.051×10¹⁸ kg) = 6.6/100 × 1.051×10¹⁸ kg = 6.9166×10¹⁶ kg

Therefore, the mass of oxygen contained within BIFs is 6.9166 × 10¹⁶ kg.

To calculate the number of moles of oxygen contained within BIFs, we'll use the molecular mass of O₂:

Molecular mass of O₂ = 0.032 kg/mole

Number of moles of oxygen contained within BIFs = (Mass of oxygen in BIFs) / (Molecular mass of O₂)

= (6.9166×10¹⁶ kg) / (0.032 kg/mole) = 2.1614375 × 10¹⁸ moles

Therefore, the number of moles of oxygen contained within BIFs is 2.1614375 × 10¹⁸ moles.

Next, let's calculate the mass of iron in BIFs:

Total mass of BIFs = 5.0×10¹⁷ kg

Percentage of iron in BIFs = 35%

Mass of iron contained within BIFs = (35% of 5.0×10¹⁷ kg) = 35/100 × 5.0×10¹⁷ kg = 1.75×10¹⁷ kg

To calculate the number of moles of iron contained within BIFs, we'll use the atomic mass of iron:

Atomic mass of iron = 0.0558 kg/mole

Number of moles of iron contained within BIFs = (Mass of iron in BIFs) / (Atomic mass of iron)

= (1.75×10¹⁷ kg) / (0.0558 kg/mole) = 3.1367419 × 10¹⁸ moles

Therefore, the number of moles of iron contained within BIFs is 3.1367419 × 10¹⁸ moles.

Finally, let's calculate the molar ratio of iron to oxygen in BIFs:

Molar ratio of iron to oxygen = (Number of moles of iron) / (Number of moles of oxygen)

= (3.1367419 × 10¹⁸ moles) / (2.1614375 × 10¹⁸ moles)

≈ 1.452

To know more about modern atmosphere

https://brainly.com/question/2508257

#SPJ11

false, the rusting of iron can be prevented by painting, oiling, greasing or varnishing its surface.

Mechanical because the 11 branches of chemistry are , Analytical chemistry, Biochemistry, Electrochemistry, Environmental,  Inorganic chemistry, Organic chemistry, Physical Chemistry, Polymer chemistry Thermochemistry, Theoretical chemistry, and Lastly Chemistry.

Mechanical Chemistry is not a branch of chemistry.

Traditionally, chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry.

To know more about chemistry -

https://brainly.in/question/165995

Answer:

17.55 carats

Explanation:

First, there is a need to know the mass of 1.0 mL of diamonds. The density of diamond is 3.51 g/mL and density is the ratio of mass and that of volume. Hence;

mass of diamond = density of diamond x volume.

Since the volume of the diamond is 1.0 mL and the density is 3.51 g/mL,

mass of 1.0 mL of diamond = 3.51 x 1.0 = 3.51 g.

1 g = 5 carats, therefore 3.51 g would be;

                3.51 x 5 = 17.55 carats.

Hence, there would be 17.55 carats of diamond in 1.0 mL of diamond.

Answer:

synthesis reactions

Explanation:

Just as synthesis reactions can only form one product, decomposition reactions can only start with one reactant

The standard potential for the given galvanic cell is +1.06 V.

To calculate the standard potential for the given galvanic cell, we need to determine the individual reduction potentials of the half-reactions and then subtract the potential of the anode (where oxidation occurs) from the potential of the cathode (where reduction occurs).

Given reduction half-reaction potentials:

Ag+(aq) + e^− → Ag(s): E∘ = +0.80 V

Ni2+(aq) + 2e^− → Ni(s): E∘ = -0.26 V

Since we have the reduction potentials for both half-reactions, we can directly calculate the standard potential for the cell:

E∘(cell) = E∘(cathode) - E∘(anode)

= E∘(Ag+(aq) + e^− → Ag(s)) - E∘(Ni2+(aq) + 2e^− → Ni(s))

E∘(cell) = +0.80 V - (-0.26 V)

= +1.06 V

Learn more about standard potential here

https://brainly.com/question/31868529

#SPJ11

Answer:

A

Explanation:

A sorry if not correct