Pennies minted after 1982 are made of mostly zinc and are coated with a bit of copper. Describe what you would have to do to find the percent composition by mass of a penny. What would you need to know, and what would you do with that information

Answer:

the mass is 10

Explanation:

30 divided by 3

Answer: mass is 10

Explanation:

F=30N M=? A=3m/s^2

M= 30N / 3m/s^2

in other words 30 divided by 3

All molecules have equally strong bonds is not true of a molecule.

Strong covalent bonds hold atoms in molecules together, whereas weak intermolecular forces of attraction hold individual molecules together.

Ionic and covalent bonds are often regarded as strong bonding. But atoms or molecules can also unite to establish other, more transient relationships. London dispersion forces and hydrogen bonds are two examples of weak bonds that are frequently observed in biology.

Although the atoms in each molecule have strong bonds holding them together, the forces of attraction between molecules are often very weak. Usually gases, such covalent compounds include HCl, SO2, CO2, and CH4. There are weak attraction forces present in molecular structures.

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The percent yield of K3PO3 is 75.54%. The percent yield of K3PO3 is 75.54% and 7.20 g of NO can be produced.

Find the percent yield of all three questions?

1. The balanced equation is 3 KOH + H3PO4 => K3PO3 + 3 H2O. The molar mass of KOH is 56.11 g/mol and the molar mass of K3PO3 is 212.27 g/mol. The stoichiometric ratio between KOH and K3PO3 is 3:1.

The theoretical yield of K3PO3 can be calculated as follows:

2.45 g KOH × (1 mol KOH / 56.11 g) × (1 mol K3PO3 / 3 mol KOH) × (212.27 g K3PO3 / 1 mol K3PO3) = 4.66 g K3PO3

The percent yield of K3PO3 can be calculated as follows:

(actual yield / theoretical yield) × 100% = (3.52 g / 4.66 g) × 100% = 75.54%

Therefore, the percent yield of K3PO3 is 75.54%.

2. The balanced equation is C2H6O + 3 O2 => 2 CO2 + 3 H2O. The molar mass of O2 is 32.00 g/mol and the molar mass of CO2 is 44.01 g/mol. The stoichiometric ratio between O2 and CO2 is 3:2.

The theoretical CO2 yield can be calculated as follows:

14.23 g O2 × (1 mol O2 / 32.00 g) × (2 mol CO2 / 3 mol O2) × (44.01 g CO2 / 1 mol CO2) = 13.31 g CO2

The percent yield of CO2 can be calculated as follows:

(actual yield / theoretical yield) × 100% = (8.25 g / 13.31 g) × 100% = 61.92%

Therefore, the percent yield of CO2 is 61.92%.

3. The balanced equation is 4 NH3 + 5 O2 => 4 NO + 6 H2O. The molar mass of NH3 is 17.03 g/mol and the molar mass of NO is 30.01 g/mol. The stoichiometric ratio between NH3 and NO is 4:4 or 1:1.

First, we need to determine the limiting reagent between NH3 and O2.

4.25 g NH3 × (1 mol NH3 / 17.03 g) = 0.250 mol NH3

4.25 g O2 × (1 mol O2 / 32.00 g) = 0.133 mol O2

The limiting reagent is O2 because it produces fewer moles of NO compared to NH3.

The theoretical yield of NO can be calculated as follows:

0.133 mol O2 × (4 mol NO / 5 mol O2) × (30.01 g NO / 1 mol NO) = 7.20 g NO

Therefore, 7.20 g of NO can be produced.

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Answer:

963.95

Explanation:

to go from moles to anything you multiply. so when going from moles to grams to take your moles and them multiply by the molar mass of the compound. the molar mass in this case is 148.3.

For the F₂ (g) , P₁ is 8.0513 atm , P₂ is 8.3457 atm, T₂ is 508.88 K, T₁ in kelvins is 490.8 K.

The initial pressure,  P₁ = 8.0513 atm

The finial pressure, P₂  = 8.3457 atm

The initial temperature , T₁ = ?

The final temperature, T₂ = 508.8 K

The pressure - temperature expression is as follows :

The pressure of the gas is inversely proportional to the temperature of the gas.

P₁  / T₁ =  P₂  / T₂

T₁ = P₁ T₂ / P₂

T₁ = ( 8.0513 × 508.8 ) / 8.3457

T₁ = 490.8 K

Thus, the initial temperature is the 490.8 K with the initial pressure of the 8.0513 atm.

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Approximately, 259.2 grams of potassium bromide can dissolve at 324 grams of water in 55 degrees

What is potassium bromide?

Potassium bromide is a salt that is formed from the elements potassium and bromine. It is a white crystalline solid with a salty taste and is soluble in water.

Potassium bromide has a wide range of applications, including its use as a medication to treat epilepsy and as a sedative for animals. It is also used in the production of photographic paper, as a flame and in the preparation of various chemicals.

Therefore, 259.2 grams of potassium bromide can dissolve at 324 grams of water in 55 degrees

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The three observations that provide the strongest evidence that the shape of Earth is a sphere are:

The Earth is not a perfect sphere, but rather an oblate spheroid, meaning it is slightly flattened at the poles and bulging at the equator. This is due to the Earth's rotation, which causes the equatorial regions to bulge outwards due to centrifugal force.

However, for practical purposes, the Earth is often considered a sphere since the difference in shape is relatively small compared to its overall size.

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The bond energy of each carbon-oxygen double bond in carbon dioxide is 188 kJ/mol.

What is Bond Energy?

Bond energy, also known as bond dissociation energy, is the amount of energy required to break a chemical bond between two atoms in a molecule or compound. It is defined as the energy released or absorbed when a chemical bond is formed or broken.

The bond energy of each carbon-oxygen double bond in carbon dioxide can be determined by using the total bond energy of the products and the bond energies of the other bonds involved in the reaction.

The reaction for the formation of carbon dioxide from carbon and oxygen is:

C(s) + O2(g) → CO2(g)

The total bond energy of the products (CO2) in the reaction is given as 1256 kJ. The bond energy of the carbon-oxygen double bond (C=O) in carbon dioxide can be determined by subtracting the bond energies of the other bonds involved in the reaction from the total bond energy of the products.

First, we need to determine the bond energies of the other bonds involved in the reaction. The bond energy of the carbon-carbon triple bond (C≡C) in molecular nitrogen is 946 kJ/mol, and the bond energy of the oxygen-oxygen double bond (O=O) in molecular oxygen is 498 kJ/mol.

The balanced equation tells us that one mole of CO2 is formed from one mole of C(s) and one mole of O2(g). Therefore, the total bond energy of the products in the reaction can be expressed as:

Total bond energy = (Bond energy of C=O bond) + (Bond energy of C≡C bond) + (Bond energy of O=O bond)

1256 kJ/mol = (Bond energy of C=O bond) + 946 kJ/mol + 498 kJ/mol

Solving for the bond energy of the carbon-oxygen double bond (C=O) in carbon dioxide:

Bond energy of C=O bond = Total bond energy - Bond energies of other bonds

Bond energy of C=O bond = 1256 kJ/mol - 946 kJ/mol - 498 kJ/mol

Bond energy of C=O bond = 188 kJ/mol

Therefore, the bond energy of each carbon-oxygen double bond in carbon dioxide is 188 kJ/mol.

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The term mole concept is used here to determine the number of moles of oxygen. The number of moles of oxygen obtained is 18.063 moles.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

The molar mass of Oxygen molecule = 31.9 g/mol

The given mass of Oxygen molecule = 576.22 g

Number of moles = 576.22 g / 31.9 g/mol = 18.063 moles

Thus the number of moles of oxygen molecule is 18.063 moles.

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1. HCl(aq) + KOH(aq) --> KCl(aq) + H₂O(l)

2. Fe(s) + CuSO₄(aq) --> FeSO₄(aq) + Cu(aq)

3. KBr --> K + Br

4. Cl₂ + 2Na --> 2NaCl

5. Al₂(SO₄)₃ + Ca₃(PO₄)₂ --> 2AlPO₄ + 3CaSO₄

6. 2NaI + Cl2 --> 2NaCl + I₂

7. 2C₄H₁₀ + 13O₂ --> 10H₂O + 8CO₂

Ex-situ conservation is a type of conservation that includes bioremediation. It is a "therapy that turns toxic compounds into less toxic or non-toxic ones using naturally occurring organisms."

Bioremediation is the biological detoxification or degradation of pollutants found in soil, wastewater, or industrial sludge. Although this process can involve microorganisms (bacteria, fungi, etc.), plant-assisted bioremediation is more commonly known as phytoremediation.

Introduction/principles. Ex-situ bioremediation is a biological procedure in which processed excavated soil is placed in a lined above-ground treatment area and aerated to improve the native microbial population's ability to degrade organic pollutants.

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The formation of two new compounds that may or may not be accompanied by color change and precipitation is a sign of a double replacement reaction.

In a double replacement reaction, two reactants exchange ions to create two new products with the same kind of chemical bonds. Typically, a precipitate is formed by one of the products. Double displacement reactions take the form:

AB + CD → AD + CB

Double replacement reactions can involve reactants with ionic or covalent bonds, but ionic molecules are more frequently involved in the kind of reaction. Double replacement reactions can involve bases and acids. The solvent is often water.

The reaction between silver nitrate and sodium chloride in water serves as an illustration of a double replacement reaction. Ionic substances include sodium chloride and silver nitrate. In aqueous solution, both reactants disperse into their ions. The sodium ion takes up the nitrate anion to make sodium nitrate, whereas the silver ion picks up the sodium's chloride ion to form silver chloride. Both of the products are ionic compounds, just like the reactants. Due to its limited solubility in water, silver chloride precipitates from solution.

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Answer:

ture

Explanation:

The potential energy of any system veritably depends upon the distance depending upon the types of forces acting on the objects. The potential energy undeniably depends upon the distance and is inversely proportional to each other. If the force between the two is attractive then the potential energy will increase with increasing distance between them both, and if the force is repulsive then the potential energy will increase will decreasing the distance between them.

The set of elements that are most likely ductile and malleable is Li, Zn, and Ag (option B).

Malleability is the ability to be hammered into thin sheets; capable of being extended or shaped by beating with a hammer, or by the pressure of rollers.

Ductility is the ability of a material to be drawn out longitudinally to a reduced section without fracture under the action of a tensile force.

Ductility and malleability are the characteristics of metals.

In option B, lithium, zinc and silver are all metals.

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The equilibrium will respond to an increased temperature of the system by shifting to the left. Option 3.

Le Charterlier's principle

According to Le Chatelier's principle, when a system at equilibrium is subjected to a stress, the system will respond in a way that tends to counteract the stress and reestablish equilibrium. In this case, an increase in temperature is a stress that will disrupt the equilibrium.

According to the reaction equation, the forward reaction is exothermic, meaning that heat is released when the reaction proceeds in the forward direction. Therefore, an increase in temperature will cause the equilibrium to shift in the direction that absorbs heat, which is the reverse reaction.

To counteract the increase in temperature, the equilibrium will shift to the left, favoring the reactants. This means that the concentration of N₂ and H₂ will increase, while the concentration of NH₃ will decrease. Therefore, the correct answer is: The equilibrium will shift to the left.

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C2H3O2 is the empirical equation for acetate. The molar mass of acetate is 59.05 g/mol.

Mass is the physical property of a body which measures its inertia, or its resistance to changes in its speed or direction of motion. Mass is often measured in units of kilograms, but can also be measured in other units such as pounds. Mass is different than weight, which is a measure of gravity's effect on a body. Mass is the same on all planets and in all parts of the universe, while the strength of gravity can vary.

To calculate the moles of acetate, we divide the mass of acetate by its molar mass:
7.44 g acetate / 59.05 g/mol = 0.1258 mol acetate
To calculate the moles of CO2 and H2O produced, we divide the mass
of CO2 and H2O by their molar masses:
17.6 g CO2 / 44.01 g/mol = 0.4002 mol CO2
7.22 g H2O / 18.02 g/mol = 0.4011 mol H2O
We can then compare the moles of CO2 and H2O produced with the moles of acetate:
0.1258 mol acetate = 0.4002 mol CO2 + 0.4011 mol H2O
This shows that the combustion of 7.44 g of acetate produced the expected ratio of CO2 and H2O.

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Answer: It's magnetic field.

Explanation: Its magnetic field causes any metal to be attracted to it. The strength of the attraction is based on how strong the field is.

Answer:

It's the weight due to gravity that it can cause something to move.

Explanation:

It is the process where strong and spatially varying magnetic fields exert forces on an object in such a way that is sufficient to counteract its weight due to gravity, allowing the object to 'float' off of the ground.

The friction force is the force that is created when two surfaces move against each other. The gravity force is the force of attraction between the puck and the Earth.

Friction is the force that resists motion when two objects rub against each other. On the ice, the puck is in contact with the ice surface, creating a frictional force between the two surfaces.

Friction: Friction is the force that resists motion when two objects rub against each other. On the ice, the puck is in contact with the ice surface, creating a frictional force between the two surfaces. The frictional force is proportional to the normal force, which is the force that the ice surface exerts on the puck in the direction perpendicular to the surface.

Gravity: The force of gravity is the force that pulls the puck towards the center of the Earth. This force is always present and is directed downwards towards the ground.

Normal: The normal force is the force that the ice exerts on the puck in the direction perpendicular to the surface. This force is a reaction force to the force of gravity and is what prevents the puck from sinking into the ice.

Drag: Drag is the force created by the air resistance from the air molecules surrounding the puck. This force acts in the opposite direction of the puck's velocity, slowing it down. This force increases with the speed of the puck, but is always negligible compared to the other forces acting on the puck.

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Balanced equation = CS₂ + O₂ = 2CO₂ + SO₂ . The reaction's mass and charge are in balance on both sides.

An equation for a chemical reaction that has the same total charge and number of atoms for both the reactants and the products is called a balanced equation. To put it another way, the reaction's mass and charge are in balance on both sides.

A balanced chemical equation is one in which the mass of the reactants and the mass of the products are both equal to the number of atoms of each element on both sides of the equation.

To comply with the law of conservation of mass, which states that "Total mass of all the products of the reaction in a chemical reaction is equal to the total mass of all the reactants," the chemical equation must be balanced.

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Answer: 37.32

Explanation:

Nitrogen gas (N2) - 28.02 g/mol
Hydrogen gas (H2) - 2.02 g/mol
Ammonia gas (NH3) - 17.03 g/mol
Using the given mass of nitrogen gas, we can first calculate the number of moles of nitrogen gas present:

moles of N2 = mass of N2 / molar mass of N2

moles of N2 = 30.7 g / 28.02 g/mol

moles of N2 = 1.096 mol

From the balanced chemical equation, we know that one mole of nitrogen gas reacts with three moles of hydrogen gas to form two moles of ammonia gas. Since we have an excess of hydrogen gas, we can assume that all of the nitrogen gas will react to form ammonia gas. Therefore, we can calculate the number of moles of ammonia gas formed using the mole ratio from the balanced chemical equation:

moles of NH3 = (moles of N2) x (2 moles of NH3 / 1 mole of N2)

moles of NH3 = 1.096 mol x (2 mol/1 mol)

moles of NH3 = 2.192 mol

Finally, we can calculate the mass of ammonia gas formed using its molar mass:  

mass of NH3 = moles of NH3 x molar mass of NH3

mass of NH3 = 2.192 mol x 17.03 g/mol

mass of NH3 = 37.32 g

Looking at the solubility curve above for KClO3, at 30 degrees Celsius 37grams will dissolve to make a saturated solution.

Saturated and unsaturated solutions: what are they?

A saturated solution is one that has as much of the solute present as is capable of dissolving. A solution is said to be unsaturated if it doesn't contain all of the solute that can disperse in it.

A depiction of solubility (measured in g/100 g water) versus temperature (measured in °C) is known as a solubility curve. On the same graph, solubility curves for various substances are frequently depicted, allowing for easy comparisons. The curved line on the graph that depicts the connection between temperature and a substance's solubility at various temperatures is known as the solubility curve.

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Answer:

The three nutrients needed for growth, repair, and other life processes are:

Proteins: Proteins are important for building and repairing tissues in the body, as well as for producing enzymes and hormones. Good food sources of protein include chicken, fish, eggs, beans, lentils, nuts, and seeds.

Carbohydrates: Carbohydrates are the primary source of energy for the body. Good food sources of carbohydrates include whole grains, fruits, vegetables, and legumes.

Fats: Fats are important for insulation, protection, and energy storage in the body. Good food sources of healthy fats include avocados, nuts, seeds, olive oil, and fatty fish such as salmon.

Explanation:

Answer:

Explanation:

In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or an expression; it is usually a number, but may be any expression. When the coefficients are themselves variables, they may also be called parameters.

Two elements in the same group on the periodic table of the elements are most similar in their number of protons.

What is electrons ?

The negatively charged atom's electrons are responsible for this. An atom's total negative charge, which is produced by all of its electrons, counteracts the positive charge of the protons in the atomic nucleus.

What is element?

The atoms make the element. The atoms are created up of the element; it is a pure substance it can't be able to split up. The element is created up of a single kind of atom. Atoms are the main thing for the creation of elements. Elements are classified according to their performance and physical properties.  

Therefore, Two elements in the same group on the periodic table of the elements are most similar in their number of protons.

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The periodic table, also known as the periodic table of elements, is set up so that scientists can rapidly determine an element's mass, number of electrons, electron configuration, and other distinctive molecular characteristics.

The chemical elements are arranged in rows and columns on what is known as the periodic table, or periodic chart of the (chemical) elements. It is frequently used in physics, chemistry, and other disciplines and is frequently regarded as a symbol of chemistry.

It is a visual representation of the periodic law, which asserts that the atomic numbers of chemical elements have a roughly periodic relationship with their characteristics. The table is split into four sections that are approximately rectangular in shape.

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0.1 moles HCl - 0.05 moles HCl = 0.05 moles HCl

Let's assume that you added 0.1 moles of HCl to each flask and that the amount of the unknown carbonate and NaOH used in each flask is the same. Let's also assume that the limiting reagent for each reaction is the unknown carbonate.

Balanced chemical equation for the reaction between the carbonate and HCl:

M2CO3 + 2HCl → 2MCl + CO2 + H2O

The limiting reagent is the unknown carbonate because it is present in a lower quantity than the HCl.

The number of moles of the limiting reagent that reacted is equal to the number of moles of HCl added, which is 0.1 moles.

The number of moles of the limiting reagent remaining is equal to the initial number of moles of the limiting reagent minus the number of moles of the limiting reagent that reacted. Since we do not know the initial number of moles of the unknown carbonate, we cannot calculate this value.

The stoichiometry of the balanced chemical equation tells us that 2 moles of HCl react with 1 mole of M2CO3. Therefore, the number of moles of HCl that reacted with the unknown carbonate is:

0.1 moles HCl x (1 mole M2CO3 / 2 moles HCl) = 0.05 moles M2CO3

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Question:

Calculate the moles of HCl remaining in each flask after the reaction with the unknown carbonate, One is the reaction between M2CO3 and HCl .The second reaction is between NaOH and HCl .They are given below . M2CO3(aq) + 2HC

We can see here that:

We see here that the bar graph will be more understandable if there is: A. Title.

Another thing that can aid in understanding the bar graph is: B. add pictures.

Using rectangular bars with heights or lengths proportional to the values they represent, a bar chart or bar graph displays categorical data. Both a vertical and a horizontal bar plot are possible. A column chart is another name for a vertical bar graph.

An appropriate question to guide Sarah's research will be: C. Which fixture uses the most water in our home?

To make this a real experiment, Sarah has to do the following: D. Collect and analyze data before and after the leaks are fixed.

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The graph supports the following statement: The use of fluorinated gases has contributed to global warming.

What role do fluorinated gases play in global warming?

Fluorinated gases, also known as F-gases, are a class of man-made gases found in a variety of industrial and commercial applications such as refrigeration and air conditioning systems, electrical equipment, and aerosol sprays. They consist of hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulphur hexafluoride (SF6).

F-gases are potent greenhouse gases, meaning they have a high global warming potential (GWP), which is a measure of their ability to trap heat in the atmosphere. HFCs, for example, have a GWP thousands of times greater than carbon dioxide (CO2).

F-gases contribute to global warming by trapping heat and preventing it from escaping into space when they are released into the atmosphere. The greenhouse effect causes the Earth's temperature to rise, resulting in climate change.

F-gases, in addition to having a direct impact on global warming, can indirectly contribute to climate change by encouraging the use of energy-intensive technologies such as air conditioning and refrigeration systems. Increased energy demand may result in the use of fossil fuels, which increases greenhouse gas emissions and worsens global warming.

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Explanation:

Refer to pic above........

To determine the mass of iron in 95.00 grammes of iron(II) chloride, we must first determine the compound's molecular formula.

The formula for iron(II) chloride is FeCl2.FeCl2 has the following molar mass:1 x 55.845 g/mol equals 55.845 g/mol 2 x 35.45 g/mol = 70.90 g/mol Cl FeCl2 molar mass = 55.845 + 70.90 = 126.745 g/mol

We can now use the molar mass of FeCl2 to calculate the number of moles of FeCl2 contained in 95.00 grammes of the compound: The number of moles equals the mass molar mass. FeCl2 molecular weight = 95.00 g 126.745 g/mol = 0.7492 mol

Because FeCl2 contains one iron atom per molecule, the sample contains 0.7492 mol of iron. Iron mass = number of moles of Fe molar mass of Fe Iron mass = 0.7492 mol 55.845 g/mol = 41.96 g As a result, the iron mass in 95.00 grammes of iron(II) chloride is 41.96 grammes.

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The stoichiometric concept is used here to determine the limiting reactant of the reaction. The relationship between the quantities of reactants and products of a chemical reaction is called stoichiometry. Here the limiting reactant is H₂ .

The substance which is totally consumed when the chemical reaction is complete is defined as the limiting reagent. The amount of the product formed is limited by this reagent.

The balanced equation is:

N₂ + 3H₂ → 2NH₃

8 mol H₂ × 2 NH₃ / 3 H₂  = 5.33 mol NH₃

3 mol N₂ × 2 NH₃ / 1 = 6 mol NH₃

Thus H₂ is the limiting reagent.

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