A girl on a bike is accelerating at a rate of 5m/s2 and has a total mass of 60kg. How much force is the girl applying to the bike to move at this rate?

Answer:

AuCl

Explanation:

Given parameters:

Mass of Gold  = 2.6444g

Mass of Chlorine  = 0.476g

Unknown:

Empirical formula  = ?

Solution:

Empirical formula is the simplest formula of a compound. Here is the way of determining this formula.

Elements                                     Au                                             Cl

Mass                                         2.6444                                     0.476

Molar mass                                 197                                          35.5

Number of moles                  2.6444/197                                 0.476/35.5

                                                 0.013                                           0.013

Divide by the

smallest                                 0.013/0.013                                 0.013/0.013

                                                       1                                                   1

The empirical formula of the compound is AuCl

Answer:

1) synthesis MgI2

2) double replacement CuS + (HCl)2

3) double replacement, not sure ab the formula sorry

The air pressure at the top of Mount Everest in atmospheres is equal to 0.2618 atm.

In Science, pressure can be defined as a measure of the force exerted per unit area of an object or physical body. This ultimately implies that, pressure is usually measured in Newton per meter square and calculated by using this formula:

P = F/A

Where:

Generally speaking, air pressure can be measured in other units such as the following:

In order to convert the value of pressure in millimeters of mercury (mm Hg) to atmosphere, we would divide by 760 as follows:

Air pressure = 199/760

Air pressure = 0.2618 atm.

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Answer: 0.261842

Explanation:

Hydrochloric acid is a stronger acid than sulphuric acid because the \(pK_a\)value of HCl is smaller than H₂SO₄

Acids are substances that contain hydrogen and can donate H⁺ ions to another substance.

Hydrochloric acid and sulphuric acid both are stronger acids as compared to other acids

HCl dissolves in an aqueous solution to give out H⁺ and Cl⁻ and is completely dissociated.

H₂SO₄ dissolves in an aqueous solution to give out H₃O⁺ and HSO₄⁻ but the ions are partially dissociated

However, HCl is a stronger acid than H₂SO₄ because of the difference between the pKa values of both acids.

The \(pK_a\) value of HCl is -6.3 and the \(pK_a\) of H₂SO₄ is -2.8.

The smaller the \(pK_a\) value, the stronger the acid.

When HCl reacts with baking soda it gives out common salt, water, and carbon dioxide as gas. The reaction is exothermic

\(NaHCO_3 + 2HCl \rightarrow NaCl +H_2O + CO_2\)

Also, when H₂SO₄ reacts with baking soda it gives out sodium sulfate, water, and carbon dioxide as gas. The reaction is exothermic

\(2NaHCO_3+H_2SO_4 \rightarrow Na_2SO_4 +2H_2O + 2CO_2\)

Hence, HCl is a stronger acid than H₂SO₄ because of its \(pK_a\) value.

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Answer:

A. K2S

B. Li2Se

C. ZnO

D. RbBr

E. Cs2S

F. Sr3N2

Explanation:

The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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The mass percent of the unknown solute in the solution will be approximately 3.92%.

Mass percent, also known as weight percent or mass/mass percent, is a unit of concentration that expresses the mass of a solute in a solution as a percentage of the total mass of the solution.

To calculate the mass percent of the unknown solute in the solution, we need to divide the mass of the solute by the mass of the entire solution and then multiply by 100.

Mass of solute = 32.43 grams (given)

Mass of solution = 826.51 grams (given)

Mass percent = (Mass of solute / Mass of solution) × 100

Substituting the given values;

Mass percent = (32.43 g / 826.51 g) × 100

≈ 3.92%

Therefore, the mass percent is approximately 3.92%.

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In 1854, Cyrus West Field conceived the idea of the telegraph cable and secured a charter to lay a well-insulated line across the floor of the Atlantic Ocean. Obtaining the aid of British and American naval ships, he made four unsuccessful attempts, beginning in 1857.

Alkali metals are not reduced because they are obtained by chemical reduction of their oxides.

Answer:

A) The solubility of NH3 increases, and the

solubility of KCl increases.

Explanation:

The solubility of ammonia and potassium chloride increases with decrease in temperature from 40°C to 20°C.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

No

Explanation: Gases have no fixed volume and no fixed shape. Gases expand to fill the space available. They can also be compressed into a very small space.

Answer:

Look up the standard reduction potentials for

Br and Mg. I find the following:Mg2+ +2e-=>

Mgls) E = -2.38 VBr2() +2e-==> 2Br-(aq) E°

There was negative cat that lived in our neighborhood who was in love with the positive cat in our house. The neutral cat who shared a room with the positive cat was not bothered at all and did not believe in love.

The sub-atomic particles are the particle which make up thye atom of elements.

The sub-atomic particles are:

The negative cat was living in our neighborhood was in love with the positive cat in our house.

The neutral cat who shared a room with the positive cat was not bothered at all and did not believe in love.

Inconclusion, the sub-atomic particles are the electrons, protons and neutrons.

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The substrate concentration required for a reaction rate V0 of 75 nmol/s is 25 μM, which is option E. An enzyme kinetics assay reveals that Vmax = 100 nmol/s and Km = 10 μM. For this assay, the substrate concentration required for a reaction rate V0 of 75 nmol/s is 30 μM.

An enzyme kinetics assay reveals that Vmax = 100 nmol/s and Km = 10 μM. For this assay, the substrate concentration required for a reaction rate V0 of 75 nmol/s is 30 μM. Enzymes are biomolecules that catalyze biochemical reactions, increasing reaction rates while maintaining biological specificity. Enzyme kinetics are the study of these chemical reactions. The Michaelis-Menten equation is widely used in enzyme kinetics to calculate the reaction rate (V0) and the amount of substrate consumed in a reaction. Vmax and Km are two parameters that can be determined using Michaelis-Menten kinetics.

Vmax is the maximal reaction rate reached when all enzymes are saturated with substrate molecules, while Km is the Michaelis constant. It is defined as the concentration of substrate when the reaction rate is half of Vmax. Vmax and Km are constants that depend on the enzyme and the substrate concentration.An enzyme kinetics assay revealed that Vmax = 100 nmol/s and Km = 10 μM. Now, let us calculate the substrate concentration required for a reaction rate V0 of 75 nmol/s. Michaelis-Menten equation provides us the answer, which is given as follows:

V0 = Vmax * [S] / (Km + [S])

Where [S] is the substrate concentration.

Substituting the given values, we get;

75 = 100 * [S] / (10 + [S])

Multiplying both sides by (10 + [S]) and simplifying, we get;

750 + 75[S] = 100[S]

30[S] = 750[S] = 25 μM

Therefore, the substrate concentration required for a reaction rate V0 of 75 nmol/s is 25 μM, which is option E.  

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The number of ionic bond is zero. Water is not classified as a salt because it is not an ionic compound.

Salts are typically defined as ionic compounds that are formed by the reaction of an acid and a base. In this type of reaction, the acid donates a hydrogen ion (H+) to the base, which accepts it to form a positively charged ion (cation) and a negatively charged ion (anion).

These ions are then attracted to each other and form an ionic bond, resulting in the formation of salt but in this case, the H and O bond is covalent i.e the electron is not donated but shared between hydrogen and oxygen atoms

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An isotope is (a) an atom that has more or fewer neutrons than it typically does.

Most elements have more than one naturally occurring isotope, and each isotope has a unique number of neutrons in its nucleus. Isotopes are identified by their atomic number, which represents the number of protons in the nucleus, and their mass number, which represents the sum of protons and neutrons in the nucleus.

The different isotopes of an element have similar chemical properties but may have slightly different physical properties. For example, some isotopes of carbon are radioactive and decay over time, while others are stable and do not decay. Isotopes are important in a variety of scientific fields, including medicine, geology, and archaeology, where they can be used for dating fossils and other materials.

Understanding isotopes is crucial in many areas of science and can provide valuable insights into the natural world.

Therefore, the correct option is (a).

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Answer:

polar

Explanation:

Answer:

Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Explanation:

Surface processes such as erosion, movement, weathering, and the deposition of sediment can modify surface features, such as mountains, or create new features, such as canyons.

Have a great day!

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

Geoscience investigates the processes that shape the Earth's surface, the resources humans utilize, and how water and ecosystems are related. It covers much more than just rocks and volcanoes. Chemistry, physics, biology, and arithmetic, as well as other scientific disciplines, are used in geoscience.

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

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Option A "store all solutions in brown bottles" is NOT required to ensure that stock solutions are free of contamination.

A stock solution is a high concentration solution that is created to be diluted for a variety of laboratory activities. For example, if an experimenter wants to prepare 1 L of 0.1 mol/L hydrochloric acid (HCl), they will prepare 83.33 mL of concentrated HCl (12 mol/L) and then add it to 916.67 mL of water to make up the final volume.Steps to ensure stock solutions are free of contamination:One should always use the following steps to ensure that stock solutions are free of contamination:Never return excess chemicals to stock bottles.Do not place dropping pipettes in stock solution bottles.Only replace tops on reagent bottles after use.Store solutions in a cool, dry place. Avoid sunlight. Store all solutions in brown bottles.Keep all solutions labelled to avoid mixing them up.Examine your glassware for cleanliness before using it.Pipette liquids with care.

Avoid spilling on the ground. Avoid placing pipette tips on the table.Never use pipette tips or glassware that have been used to mix or carry other substances.Never attempt to taste or smell any chemicals or solutions.Wear protective gloves and lab coats when dealing with dangerous substances.

Stock solutions should always be checked for contamination before they are used. If contamination is suspected, the solution should be discarded.

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Answer:

10.8

Explanation:

That's my guess, I hope you figure everything out though.

A nail contains 0.10 moles of iron. Therefore, 5.58g is the mass in gram of iron in the nail. Iron makes up 5% of the Earth's crust.

Iron makes up 5% of the Earth's crust and is the second most abundant metal after aluminum, and the fourth most abundant element after oxygen, silicon, and aluminum. Iron, the main component of Earth's core, serves as the most prevalent element on the planet and is relatively abundant in the Sun and in other stars.

The free metal is uncommon in the crust, appearing as domestic iron in basalts in Greenland as well as carbonaceous deposits in the United States, as well as kamacite, a low-nickel meteoric iron. Taenite, a natural alloy of nickel-iron, is found in terrestrial deposits including meteorites.

mass = moles ×molar mass

       = 0.10 ×55.8

       = 5.58g

Therefore, 5.58g is the mass in gram of iron in the nail.

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The 6 moles of oxygen gas, approximately 4.8 moles of water will be produced in this reaction.

In the given unbalanced equation: C3H8 + O2 = CO2 + H2O, we are interested in determining the number of moles of water (H2O) produced from 6 moles of oxygen gas (O2).

First, let's balance the equation:

C3H8 + 5O2 = 3CO2 + 4H2O

From the balanced equation, we can see that 4 moles of water are produced for every 5 moles of oxygen gas consumed. Therefore, if we have 6 moles of oxygen gas, we can set up a proportion:

5 moles of O2 --> 4 moles of H2O

6 moles of O2 --> x moles of H2O

Using the proportion, we can solve for x (the number of moles of water):

(6 moles O2 * 4 moles H2O) / 5 moles O2 = 4.8 moles of H2O

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Oxidation D) occurs when the electrons are lost from an atom or compound. Oxidation refers to a chemical reaction where there is a transfer of electrons from one substance to another.

During oxidation, the substance that loses electrons is known as the reducing agent while the substance that gains electrons is known as the oxidizing agent. When an atom or compound loses electrons during oxidation, it becomes more positively charged, and this results in a decrease in its negative charge.

For example, when iron rusts, it undergoes oxidation as it loses electrons to oxygen. The iron atoms lose their electrons, and as a result, they become positively charged. This causes the iron compound to have a more positive charge than it did before the oxidation process.

In summary, oxidation occurs when electrons are lost from an atom or compound, which results in a decrease in the negative charge of the compound or atom.

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Enantiomers are molecules that have non-superimposable mirror images. They have the same physical and chemical properties, except for their ability to rotate plane-polarized light.  Diastereomers are stereoisomers that are not mirror images of each other. They have different physical and chemical properties and do not rotate plane-polarized light.  Constitutional isomers are a group of isomers that have different arrangements of atoms in their structure but the same molecular formula.

The key is in the arrangement of atoms and the presence or absence of chiral centers. Enantiomers have the same arrangement of atoms but differ in their orientation in space. They also possess a chiral center. For diastereomers, the molecule must have more than one chiral center. There are different ways to differentiate diastereomers, but a simple approach is to examine the relative positions of their substituents. Constitutional isomers can be distinguished by examining their connectivity, bonding, and stereochemistry. They have different properties and characteristics because they have different arrangements of atoms. Finally, the same compound is a single molecular species that has no mirror image and does not rotate plane-polarized light. Its characteristics remain the same regardless of the orientation of the molecule.

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Answer:

It's a chemical change

Answer:

Explanation:

Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps. Of all the water on Earth, more than 99 percent of Earth's water is unusable by humans and many other living things!

The ideal gas law can be used to solve this issue: When the vessel is heated to 220°C, PV = nRT, and a pressure of around 2509 kPa is created.

The ideal gas law can be used to solve this issue: PV = nRT

We must first determine how many moles of ethane there are:

Where P = 2200 kPa, V = 0.35 m3, R = 8.31 J/mol K (the gas constant), and T = 25 °C + 273.15 = 298 °K, n = PV/RT, is defined.

n = 0.0522 mol when calculated as (2200 kPa x 0.35 m3) / (8.31 J/molK x 298.15 K). The new pressure at 220°C can now be determined using the ideal gas law once more: Where T' = 220 °C + 273.15 °C = 493.15 K, P' = nRT'/V.

P' = 2509 kPa = (0.0522 mol x 8.31 J/mol x 493.15 K) / 0.35 m3

As a result, when the vessel is heated to 220°C, a pressure of about 2509 kPa develops.

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Answer:

It is illegal

Explanation:

Fracking involves drilling deep into the earth crust in which a water mixture with high pressure is directed at the rock with the purpose of releasing the gas inside. This process is common in the exploration of natural gas and other hydrocarbons.

It is however illegal because the water are mostly contaminated due to the hydrocarbons present and harmful to life. It is advisable and the best to remove the water and recycle them in treatment plants