what is the mass of Cu in 14.0 g of an alloy that is 16.6% Cu

Please make me brainalist and keep smiling dude I hope you will be satisfied with my answer

4NH3 + 5O2 = 4NO + 6H2O

Now ask yourself, "what do I want to find". You want to know how many moles of NO are produced.

What are you given? You are given that you start with 6.96 g NH3 and excess O2.

Now you need the correct conversion factor. The conversion factor is a fraction with the numerator containing the quantity you are trying to find, and the denominator containing what you are given.

4 moles NO / 4 x mol mass of NH3 Note that the numerator is in moles of NO which is the coefficient of NO in the balanced equation. The denominator includes the coefficient for NH3 x mol. mass of NH3. It should be this way whenever a substance is given in grams. Putting numbers in the factor gives you

4 moles NO / 4 x 17.031 g /mole = 0.0587 moles NO per gram of NH3. Now multiply the factor result by the number of grams NH3 you were given.

0.0587 moles NO / g NH3 x 6.96 g NH3 = 0.409 g NO produced.

______________________________________

Step 1: convert grams of NH3 to moles of NH3

Step 2: convert moles of NH3 to moles of NO using the coefficients in the balanced equation

(6.96g NH3) X (1 mol NH3 / 17.031g) = 0.409 mol of NH3

(0.409 mol NH3) X (4 mol NO / 4 mol NH3) = 0.409 mol NO

Because NH3 and NO both have a coefficient of 4 in the balanced equation, the number of moles are the same for those particular compounds.

The compound that was added to the Miller-Urey experiment to allow pre-cell enclosures to form was ammonia.

In the Miller-Urey experiment, Stanley Miller and Harold Urey aimed to simulate the conditions of the early Earth's atmosphere to investigate the origins of life. They created an apparatus that contained a mixture of gases, including methane, ammonia, hydrogen, and water vapor. The mixture was then exposed to an electric spark to simulate lightning, and the resulting products were analyzed.

Ammonia played a crucial role in the formation of pre-cell enclosures, such as lipid bilayers, which are essential components of cell membranes. The ammonia in the mixture reacted with the other gases and water vapor to produce a variety of organic compounds, including amino acids, which are the building blocks of proteins. The amino acids then polymerized to form long chains, which eventually led to the formation of lipids. These lipids could then self-assemble into enclosed structures, such as vesicles, that are similar to the cell membranes of modern cells.

Overall, the addition of ammonia to the Miller-Urey experiment played a significant role in creating the conditions that allowed for the formation of pre-cell enclosures, which are critical steps in the origins of life.

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When we bring a magnet near the doorbell when it is not connected to the battery, we feel a pull, or an attractive force.

For this the hypothesis can be:

Hypothesis: If there is no permanent magnet in the doorbell, just metal like iron, then when we bring a paper clip to the doorbell, we will observe an attractive force between the paper clip and the doorbell due to the interaction between the magnet and the iron in the doorbell.

Hypothesis: If there is a permanent magnet in the doorbell, then when we bring a paper clip to the doorbell, we will observe a stronger attractive force between the paper clip and the doorbell due to the interaction between the magnet and the metal components (such as iron) in the doorbell.

Thus, these can be the Hypothesis for the given scenario.

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Created by considering different compounds and their ability to form hydrogen bonds with water molecules. Here's a series that shows increasing hydrogen bonding.

Methane (CH4): Methane consists of only nonpolar covalent bonds and lacks hydrogen bonding. It does not readily form hydrogen bonds with water.

Ethanol (CH3CH2OH): Ethanol contains a hydroxyl (-OH) functional group, which can participate in hydrogen bonding. It can form hydrogen bonds with water, but its hydrogen bonding ability is relatively weaker compared to other compounds in the series.

Acetic Acid (CH3COOH): Acetic acid contains a carboxyl (-COOH) functional group, which can form hydrogen bonds with water. It has a stronger ability to form hydrogen bonds compared to ethanol due to the presence of an additional oxygen atom.

Glycolic Acid (HOCH2COOH): Glycolic acid possesses two hydroxyl groups, allowing for more hydrogen bonding interactions with water. It can form stronger hydrogen bonds compared to acetic acid.

Glycerol (C3H8O3): Glycerol contains three hydroxyl groups, enhancing its ability to form hydrogen bonds with water. The multiple hydroxyl groups increase the number of potential hydrogen bonding sites, resulting in stronger interactions with water.

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There are approximately 1.290 x 10^24 molecules in 48.0 L of oxygen gas (O₂).

To determine the number of molecules in a given volume of gas, we need to use the ideal gas law and Avogadro's principle. The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. First, let's convert the given volume of 48.0 L to moles. We can assume the temperature and pressure are constant. The molar volume of any gas at standard temperature and pressure (STP) is 22.4 L/mol.

48.0 L / 22.4 L/mol ≈ 2.143 moles

Now, we need to convert moles to molecules. One mole of any substance contains Avogadro's number of molecules, which is approximately 6.022 x 10^23 molecules/mol.

2.143 moles x 6.022 x 10^23 molecules/mol ≈ 1.290 x 10^24 molecules

It's important to note that this calculation assumes ideal gas behavior, which may not be completely accurate under all conditions. Additionally, the number of molecules may vary depending on factors such as temperature and pressure. However, for practical purposes and standard conditions, this calculation provides a reasonable estimate of the number of molecules in the given volume of oxygen gas.

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The group 6A (16) elements are located in the sixth column or group of the periodic table. These elements include oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and polonium (Po).

To determine which element in group 6A lies in period 4, we can count down the rows of the periodic table to locate the fourth row. This row is also referred to as the fourth period. Moving horizontally across the fourth row, we find that sulfur (S) is the element in group 6A that is located in period 4.

Therefore, the chemical symbol for the group 6A (16) element that lies in period 4 is S, which stands for sulfur. Sulfur is a nonmetal with atomic number 16, atomic mass 32.06, and a melting point of 115.21 °C. It is widely used in the production of sulfuric acid and in the vulcanization of rubber.

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Answer:

Properties of Acids:

Taste : Sour

Effect on blue litmus paper: Turns Red

Effect on red litmus paper: No Effect

Effect on skin: Corrosive

Electrical Conductivity: Aqueous solutions conduct electricity

Properties of bases:

Taste : Bitter

Effect on blue litmus paper: No effect

Effect on red litmus paper: Turns Blue

Effect on skin: Harm Skin Tissue

Electrical Conductivity: Aqueous solutions conduct electricity

Answer:

properties of acid

sour taste

change the color of indicators

acids react with active metals to form salt and hydrogen gas

acids react with carbonates and hydrogen carbonates to form salt, water, and carbon dioxide gas

acids neutralize base

acids are electrolytes

properties of base

bases are slippery to the touch and have bitter taste

soluble bases change the colour of indicators

soluble bases release hydrogen ion in aqueous solution

bases neutralize acids or acidic oxides to form salt and water

aqueous solutions of bases conduct electricity

Explanation:

hope it helps

The ions or molecules present in the solution after adding 12.50 mL of NaOH halfway to the equivalence point are H+ ions, Cl⁻ ions, Na+ ions, and \(H_{2}O\) molecules.

To calculate the moles of HCl and NaOH present in the solution, we use the formula:

Moles of HCl = Volume (L) × Concentration (M)

= 0.0500 L × 0.050 M

= 0.00250 moles

Moles of NaOH = Volume (L) × Concentration (M)

= 0.0125 L × 0.10 M

= 0.00125 moles

To determine the reaction between HCl and NaOH, we use the reaction:
HCl + NaOH → NaCl + \(H_{2}O\)

The moles of the remaining reactant and the product formed, we use the formula:

Moles of remaining HCl = Moles of HCl - Moles of NaOH

= 0.00250 - 0.00125

= 0.00125 moles

Moles of NaCl formed = Moles of NaOH reacted = 0.00125 moles

The ions or molecules present in the solution can be identified by:

In summary, after adding 12.50 mL of NaOH halfway to the equivalence point, the ions or molecules present in the solution are H+ ions, Cl- ions, Na+ ions, and \(H_{2}O\) molecules.

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Answer:

False

Explanation:

Water melting from ice into a liquid is not a chemical reaction or chemical change. It is merely a phase change from solid to liquid.

The melting of water from ice to liquid is never a chemical reaction.

Chemical reactions are reactions that involve the formation of new products from the reactants.

It is as opposed to physical changes in which substances just change their states and can be returned back to the original state with time.

The melting of ice to liquid water is a physical change. The water can be returned back to ice by a process known as freezing.

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When considering the commercial production and marketing of apples , several factors like pre-harvest factors, harvesting, precooling, packing operations, packaging, storage, transportation, marketing, and retailing.

Pre-harvest factors: These include selecting suitable varieties, managing pests and diseases, providing proper nutrition, irrigation, and maintaining orchard hygiene to ensure healthy and high-quality apple crops.

Harvesting: Harvesting apples at the right time is important to ensure optimal taste and quality. Proper techniques should be employed, such as hand-picking or using mechanical harvesters, and care should be taken to prevent damage to the fruit during harvesting.

Precooling: Apples should be rapidly cooled after harvest to remove field heat and preserve their freshness. This can be done using forced-air cooling or hydrocooling methods to bring down the temperature quickly.

Packing operations: Sorting and grading apples based on size, color, and quality is essential for uniformity and market appeal. Proper packing procedures, including gentle handling and appropriate equipment, should be followed to prevent bruising and maintain fruit quality.

Packaging: Choosing suitable packaging materials and designs that provide protection, ventilation, and visibility of the apples is crucial. Packaging should be attractive, informative, and eco-friendly to attract customers and maintain product integrity.

Storage: Apples require controlled storage conditions to extend their shelf life. Maintaining the right temperature, humidity, and ventilation in storage facilities is essential to prevent spoilage, maintain freshness, and avoid losses.

Transportation: Efficient and timely transportation of apples from the orchard to the market is critical. Proper handling, packaging, and temperature control during transportation help preserve the quality and minimize damage.

Marketing: Developing effective marketing strategies, such as branding, promotion, and pricing, is crucial to reach the target market, create demand, and differentiate the product from competitors. Understanding consumer preferences and market trends is essential for successful marketing.

Retailing: Establishing partnerships with retailers, such as grocery stores or farmers' markets, is important for distribution and sale of apples. Providing attractive displays, product information, and maintaining quality standards at the retail level helps attract customers and ensure repeat business.

By considering these factors and aspects in the production and marketing of apples, producers can enhance the overall success and profitability of their business while delivering high-quality produce to consumers.

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Answer:

239

Explanation:

i think this is the answer

Answer:

purifying copper to produce copper wiring for homes

Explanation:

Answer:

b.purifying copper to produce copper wiring for homes

Explanation:

Because it provides a very high concentration compared to what is possible with saline.

A high chloride ion concentration shifts the equilibrium position to the right due to Le Chatelier's principle.

Uses of HCL -

Hydrogen chloride is produced when many plastics are burned. Acute (short-term) inhalation exposure in humans can cause eye, nose, and respiratory tract irritation and inflammation, and pulmonary edema.

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In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas. The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.

The heating curve is the relationship between the heating system supply temperature and the outside air temperature.

Gas molecules have the highest average velocities among the three states of matter so gas has the highest kinetic energy.

During freezing, a substance loses a lot of potential energy so solid has the least potential energy.

Hence, In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas.

The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.

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Answer:

The sequence from longest wavelength (radio waves) to shortest wavelength (gamma rays) is also a sequence in energy from lowest energy to highest energy. Remember that waves transport energy from place to place. The energy carried by a radio wave is low, while the energy carried by a gamma ray is high.

Answer:0.423 meter

Explanation:

We are aware that ether is a polar solvent and pentane is an apolar one. The less polar material moves quicker while more polar component travels slower.

By use of polar interactions, the sample that has to be separated will be adsorbed to the stationary phase comprised of alumina or silica gel. The eluting solvent will be used to elute these adsorbed molecules. Both polar and non-polar solvents may be used as these eluting agents. The interactions with the polar molecules that are adsorbed to the chromatographic column grow when the polarity of the eluting solvent is increased. Pentane is less polar than ether when compared. As a result, polar molecules are separated from and eluted from the stationary phase using ether. This is due to the fact that polar solvents may dissolve polar substances due to polar interactions.

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The value of the ionization constant, Ka, for a weak, monoprotic acid can be calculated as approximately 2.59 x 10⁻⁵.

The degree of ionization (α) is defined as the ratio of the concentration of ionized acid ([HA⁺]) to the initial concentration of the acid ([HA]), expressed as a decimal or percentage:

α = [HA⁺] / [HA] * 100%

Given that the solution is 0.85% ionized, α = 0.85/100 = 0.0085.

The ionization constant, Ka, is related to the degree of ionization using the equation:

Ka = (α² * C) / (1 - α)

Where C is the initial concentration of the acid.

Substituting the known values, we have:

Ka = (0.0085² * 0.075 M) / (1 - 0.0085)

Ka ≈ 2.59 x 10⁻⁵.

Therefore, the ionization constant (Ka) for this weak, monoprotic acid is approximately 2.59 x 10⁻⁵.

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Answer:

cutting paper is not an example of chemical change.

Explanation:

cutting paper is physical change, its physical properties (size, shape ) change but chemical composition remain same.

The cutting paper is not a example of chemical change of a chemical reaction.

The kind of reaction in which one kind of element get converted into another kind of elements or molecule is referred as chemical reaction.

Chemical changes take place when a material combines with the other to generate a new substance, a process known as chemical synthesis, or when a molecule decomposes into  more than one separate chemicals, a process known as chemical decomposition. These processes are known as chemical reactions, and they are generally irreversible unless they are followed by more chemical reactions.

Cutting paper is just a physical change not chemical change since the paper's characteristics did not change; only the shape, which would be a physical attribute, changed. The term "chemical change" refers to a change in a substance's chemical properties. Burning of paper, for example, or rusting of iron.

Therefore, cutting paper is not a example of chemical change.

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The precautions to be taken when working up the distillate with Na₂CO₃ include a) wearing protective gloves and goggles, b) adding Na₂CO₃ slowly and with stirring to avoid splashing, c) using a fume hood or working in a well-ventilated area, e) monitoring the reaction mixture for any signs of gas evolution or foaming, f) and neutralizing any excess Na₂CO₃ with an acid, such as HCl or H₂SO₄, before disposal.

When working up a distillate with Na₂CO₃, it is important to take proper precautions to ensure safety and proper disposal of waste materials. Wearing protective gloves and goggles is necessary to prevent contact with the skin and eyes, as Na₂CO₃ can be corrosive.

Adding Na₂CO₃ slowly and with stirring helps to prevent splashing and potential injury. Using a fume hood or working in a well-ventilated area is necessary to prevent inhalation of any harmful fumes produced during the reaction.

Monitoring the reaction mixture for any signs of gas evolution or foaming is important to ensure that the reaction is proceeding as expected and that there are no hazards present.

Neutralizing any excess Na₂CO₃ with an acid, such as HCl or H₂SO₄, before disposal is necessary to ensure that the waste is properly neutralized and does not pose a hazard.

Disposal of Na₂CO₃ in the regular trash bin is not recommended as it is considered hazardous waste and should be disposed of properly.

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Complete Question:

What precautions should you take when working up the distillate with Na₂CO₃? Check all that apply:

a) Wear protective gloves and goggles.

b) Add Na₂CO₃ slowly and with stirring to avoid splashing.

c) Use a fume hood or work in a well-ventilated area.

d) Dispose of Na₂CO₃ in the regular trash bin.

e) Monitor the reaction mixture for any signs of gas evolution or foaming.

f) Neutralize any excess Na₂CO₃ with an acid, such as HCl or H₂SO₄, before disposal.

Please select all the correct options from the above

Answer:

if the negative ion ends in -ide

Explanation:

The rules for naming the ionic compounds is given as :

The negative ion (anion) is written next. The suffix is added at the end of the negative ion (anion). The suffix used is '-ide'.

Answer:

A. if the negative ion ends in -ide

Explanation:

in ionic compounds the second name in the chemical name is the negative atom, and always the second name in a chemical name has to end in -ide.

So putting those together, the negative ion (which in ionic compounds, comes SECOND) ends in -ide.

Also, I got this question correct on the edg review! :)

Thank God because he blesses us everyday!

Answer:

Thunder!! Hope this helps!!

Answer:

190n

Explanation:

190 190 and because it is easy to understand if you didn't understand my answer ask any man

... You didn't attach anything

Answer:

beryllium chloride

Explanation:

Therefore a compound made from beryllium and chlorine will be named beryllium chloride.

Answer:

Sulphate ion

Explanation:

Zinc will undergoes oxidation. Zn2+ - - > Zn + 2e-

Copper will undergoes reduction. Cu2+ + 2e- - - > Cu

Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

Answer:

Mn(NO3)3 Molar mass = (54.93) + (3 x 14) + (9 x 16) = 240.93g/mol

Total number of Oxygen atoms in formula = 9

Total mass of oxygen atoms theoretically in the formula = 9x16 = 144g/mol

Oxygen's percentage composition:

(144/240.93) x 100 = 59.7% of the compound is oxygen