A coin is 3.00% Cu by mass. If the mass of the coin is 4.0561g, how many moles of Cu does it contain

Answer:

Acidic

Explanation:

On a standard Ph scale, anything lower than 7 on a scale is acidic and anything over 7 is alkaline lemon consists a large amount of acidity due to the amount of citric acid equipped inside it, Bleach is placed on the alkaline side of the scale because it includes chemicals such as Sodium hypochlorite and KOH(Potassium hydroxide) which can cause chemical burns when they are near contact as a substance itself.

Simply, if a substance has a ph of 3 it is acidic.

(if you'd like you could choose my answer as brainliest it would help me a lot)

Pounds of gold ore :  11,02311

Given

5 g of gold

0.1% gold by mass

Required

Pounds of gold ore

Solution

\(\tt \%mass~gold=\dfrac{mass~gold}{mass~ore}\times 100\%\)

For percent mass = 0.1%, than mass of gold ore :

\(\tt 0.1\%=\dfrac{5~g}{mass~ore}\times 100\%\\\\mass~ore=\dfrac{5\times 100}{0.1}\\\\mass~ore=5000~g\)

Conversion factor :

1 g = 0,00220462 pound, than for 5000 g = 11,02311 pounds

Answer:

please also share the excerpt

Explanation:

Thank you

Answer:

34.44 kg

Explanation:

First we convert 1.00 kg of phosphorus (P) into moles, using its molar mass:

Then we convert 0.03125 kmoles of P into kmoles of Ca₃(PO₄)₂:

Now we calculate the mass of 0.0625 kmoles of Ca₃(PO₄)₂:

Finally we calculate the required mass of the ore, using the definition of content percentage:

Answer:

1.Reactivity

2.combustibility

3.Shape

Hope this helps,

If you think I am right please give brainliest

Happy Holidays!

Explanation:

We can produce more products by;

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

Water is created through an exothermic process. Heat energy is released when hydrogen gas (H2) and oxygen gas (O2) mix to make water (H2O). An exothermic reaction is characterized by this energy release.

The reaction's overall energy change is negative, which shows that energy is released. The reaction is exothermic because the extra energy is released as heat into the environment.

Learn more about exothermic reaction:https://brainly.com/question/28546817

#SPJ1

Missing parts;

Water can be made using the reversible reaction shown. Which change would

keep this reaction from shifting to form more of the product?

2H₂+022H₂O + energy

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

D. Increasing the temperature in the reaction vessel

Answer:

No and Yes

Explanation:

This is both possible and impossible. When you put your mind to what you believe, you can achieve it through patience and minded values. Your mind can either be your Greatest enemy or your Best Ally.

The relationship  between the density (d) of a gas and the rate at which the gas diffuses is r = k/√d.

option B.

Graham's law of diffusion, also known as Graham's law of effusion, states that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its gas density.

In other words, lighter gases diffuse or effuse faster than heavier gases at the same temperature and pressure.

Mathematically, this law is written as;

r ∝ 1/√d

r = k/√d

where;

Learn more about gas diffusion here: https://brainly.com/question/94094

#SPJ1

For this section:

(d) To determine which acid would be completely dissociated when dissolved in water, consider the strength of the acid and its ability to ionize completely. Strong acids are those that ionize completely in water, while weak acids only partially dissociate.

Among the given options:

(H O)₂SO is sulfuric acid (H₂SO₄), which is a strong acid and completely dissociates in water.

(H O)IO₃ is iodic acid (HIO₃), which is also a strong acid and completely dissociates in water.

(H O)₂SO₂ is not a known acid and cannot be evaluated for dissociation.

HCO₂H is formic acid (HCOOH), which is a weak acid and only partially dissociates in water.

Therefore, the acids that would be completely dissociated when dissolved in water are (H O)₂SO and (H O)IO₃.

(e) To estimate the pH of the given solutions formed by titration, compare the moles of the acid and base used in the reaction.

(i) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous HCl, the reaction between a strong acid (HCl) and a strong base (NaOH) forms a neutral salt (NaCl) and water. The resulting solution would have a pH of 7, indicating neutrality.

(ii) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous acetic acid, consider the ionization of acetic acid and the formation of its conjugate base. The pKa of acetic acid is given as 4.76.

Since the volumes and concentrations of the acid and base are equal, we have a 1:1 mole ratio between them. This means that half of the acetic acid will be neutralized, and the remaining half will be in the form of the conjugate base (acetate ion, CH₃COO-). The resulting solution will be a buffer solution with a pH close to the pKa of acetic acid, which is 4.76.

(f) To predict the products formed from mixing the given reagents, we need to consider the reactions and the possible chemical reactions that occur.

(i) 3I₂ + PBr₃: This reaction involves the combination of iodine (I₂) with phosphorus tribromide (PBr₃). The balanced equation is:

3I₂ + 2PBr₃ → 6IBr + P₂

(ii) 4LiH + GaCl₃: This reaction involves the combination of lithium hydride (LiH) with gallium trichloride (GaCl₃). The balanced equation is:

4LiH + GaCl₃ → 4LiCl + GaH₃

(iii) NH₃ + BCl₃: This reaction involves the combination of ammonia (NH₃) with boron trichloride (BCl₃). The balanced equation is:

NH₃ + BCl₃ → NH₃BCl₃

Find out more on pH here: https://brainly.com/question/26424076

#SPJ1

Some of the essential features of computers:

1. Processing Power

2. Storage Capacity

3. Memory

4. Input and Output

5. Connectivity

6. Software

7. Multitasking

8. Scalability

9. Reliability and Durability

10. User Interface

Computers are complex machines that have become an integral part of our daily lives. They possess several key features that enable them to perform a wide range of tasks efficiently. Here are some of the essential features of computers:

1. Processing Power: Computers are capable of executing complex calculations and tasks at incredible speed. They contain powerful processors that can perform billions of operations per second, enabling them to handle various applications and processes.

2. Storage Capacity: Computers have the ability to store and retrieve vast amounts of data. They come equipped with different types of storage devices such as hard drives, solid-state drives (SSDs), and cloud storage, providing ample space for storing files, programs, and operating systems.

3. Memory: Computers have two primary types of memory: RAM (Random Access Memory) and ROM (Read-Only Memory). RAM provides temporary storage for data and instructions that the computer is actively using, while ROM contains firmware and permanent instructions that are essential for booting up the computer.

4. Input and Output: Computers allow users to interact with them through various input and output devices. Input devices include keyboards, mice, touchscreens, and microphones, while output devices include monitors, printers, speakers, and headphones. These devices enable users to input commands and receive feedback from the computer.

5. Connectivity: Computers can connect to networks and other devices, enabling communication and data transfer. They have built-in network adapters and support for various connectivity options such as Ethernet, Wi-Fi, Bluetooth, and USB, allowing users to access the internet, share files, and connect to peripherals.

6. Software: Computers run on software, including operating systems, applications, and utilities. The software provides the instructions and programs that allow users to perform tasks, manipulate data, and manage hardware resources.

7. Multitasking: Computers are designed to handle multiple tasks simultaneously. They can execute multiple programs concurrently, switch between tasks rapidly, and allocate system resources efficiently, providing users with the ability to multitask and enhance productivity.

8. Scalability: Computers offer scalability, allowing users to upgrade hardware components and expand storage capacity as needed. This feature ensures that computers can adapt to evolving technological demands and accommodate future growth.

9. Reliability and Durability: Computers are designed to be reliable and durable. They undergo rigorous testing and are built with high-quality components to ensure stable performance and withstand daily use.

10. User Interface: Computers provide graphical user interfaces (GUIs) that enable users to interact with the system easily. GUIs utilize visual elements such as icons, windows, and menus, making it intuitive for users to navigate and access various functions.

These features collectively make computers versatile, powerful, and indispensable tools in our modern world, enabling us to accomplish a wide range of tasks efficiently and effectively.

for more questions on storage

https://brainly.com/question/26972068

#SPJ8

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{8.72 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.48504...\)

We have the final answer as

Hope this helps you

The concentration of the solution is as follows;

H⁺ = 0.045 M

SO₄(²⁻) = 0.045 M

HSO₄⁻ = 0.155 M

Potassium hydrogen sulfate, KHSO₄ is a salt that will completely dissociate in water into its constituent ions, K+ and HSO₄⁻.

HSO₄⁻ ⇌ H⁺ + SO₄(²⁻)

Let's say x is the amount of HSO4- that dissociates. Then it will be

HSO₄⁻  = 0.20 - x

H⁺ = x

SO₄(²⁻) = x

Now, we can use the Ka for HSO4-, which is given as 1.3 x 10⁻². We will get the equation

Ka = (H⁺)(SO₄(²⁻)) / (HSO₄⁻ )

Substituting the expressions for the equilibrium concentrations gives:

1.3 x 10⁻² = (x)(x) / (0.20 - x)

So the concentrations are:

HSO₄⁻  = 0.20 - x = 0.20 - 0.045 = 0.155 M

H⁺ = x = 0.045 M

SO₄(²⁻) = x = 0.045 M

Find more exercises on concentration of solutions;

https://brainly.com/question/10720472

#SPJ1

Answer: Mixture

Explanation:

Element is a pure substance which is composed of atoms of similar elements.

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air which conatins a mixture of \(N_2\), \(O_2\) , \(Ar\) and \(CO_2\)

Answer:

When conducting a chemistry lab experiment using chalk (calcium carbonate) in vinegar (acetic acid), there are several limitations and precautions to be aware of:

Limitations of chalk in vinegar chemistry experiment:

Reaction rate: The reaction between chalk and vinegar is relatively slow, which may require a longer observation period or higher concentration of vinegar to observe significant changes within a reasonable time frame.

Solubility: Chalk may not dissolve completely in vinegar, resulting in incomplete reaction or difficulty in obtaining accurate results.

Product formation: The reaction between chalk and vinegar produces carbon dioxide gas, water, and calcium acetate. The carbon dioxide gas may escape into the atmosphere, leading to loss of product and inaccurate measurements.

pH: Chalk is a basic substance, and the reaction with vinegar, which is acidic, may result in neutralization, leading to a decrease in the overall acidity of the reaction mixture.

Precautions to take in chalk in vinegar chemistry experiment:

Ventilation: The reaction between chalk and vinegar produces carbon dioxide gas, which can displace air and potentially cause asphyxiation in a closed or poorly ventilated area. Conduct the experiment in a well-ventilated area or under a fume hood to ensure adequate air circulation.

Eye and skin protection: Vinegar is an acid and can cause skin and eye irritation. Wear appropriate personal protective equipment (PPE), such as gloves and goggles, to protect yourself from contact with vinegar or any other chemicals used in the experiment.

Chemical handling: Handle the chemicals, including chalk and vinegar, with care, following proper lab safety protocols. Avoid ingestion, inhalation, or direct contact with the chemicals, and dispose of them properly according to local regulations.

Accuracy in measurements: Use calibrated and accurate measuring tools, such as graduated cylinders or burettes, to measure the amount of chalk, vinegar, and other reagents accurately. This will ensure the reliability and accuracy of the experimental results.

Observations: Make careful and detailed observations during the experiment, noting any changes in appearance, gas evolution, or other relevant observations. Take measurements at appropriate intervals and record the data accurately for analysis and interpretation.

It is important to follow good laboratory practices, including proper chemical handling, accurate measurements, and cautious observations, to ensure safe and reliable results in a chalk in vinegar chemistry lab experiment. Consult with a qualified instructor or supervisor for specific guidelines and precautions related to your experiment.

Answer:

2 moles

In words, 1 mole of Mg reacts with 2 moles of HCl to form 1 mole of MgCl₂ and 1 mole of H₂. The molar ratio of HCl to MgCl₂ is 2:1.

A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.

When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.

There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.

So we can conclude that a large population of resources will lead to more births.

Learn more about jellies here: https://brainly.com/question/25630111

#SPJ1

The change in temperature of the coins will depend on the energy they need to do so, this energy depends on the specific heat of the material. The specific heat corresponds to the energy required to raise the temperature of 1 gram of material 1 degree Celsius.

We see that copper has a higher specific heat, therefore, copper will require more energy to raise its temperature and will require more time.

So, the answer will be: C. Copper; requires more energy

Answer:

2NaN₃ → 2Na + 3N₂

Explanation:

First we use the information given by the problem to write an unbalanced equation:

There are 3 N atoms on the left side and only 2 on the right, to remedy that we put a 2 coefficient on NaN₃ and a 3 coefficient on N₂:

Now there are 6 N atoms on both sides of the equation. What's left is to balance Na atoms:

The equation is now balanced.

The properly balanced chemical equation for this chemical reaction is given by \(2NaN_3 \rightarrow 2Na + 3N_2\)

A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant side (left) is equal to the number of atoms on the product side (right).

In this scenario, Sodium azide (\(NaN_3\)) undergoes a decomposition reaction due to an electrical impulse, which causes it to produce elemental sodium and nitrogen gas.

The properly balanced chemical equation for this chemical reaction is given by:

                                      \(2NaN_3 \rightarrow 2Na + 3N_2\)

Read more on chemical equation here: brainly.com/question/13750908

Answer:

The speed of the water particles increases.

The number of collisions between water particles increases.

Explanation:

When water particles are heated, the speed of the particles increases and the number of collisions between the water particles also increases.

Because air puffs up the cream as it is whipped, there is a physical change even though the ingredients are still cream and air.

Physical modifications are those that affect a chemical substance's form but not its chemical content. Physical changes may normally be used to separate compounds into chemical elements or simpler compounds, but they cannot be used to separate mixtures into their component compounds.

Liquid cream is extensively combined with small air bubbles to form the foam colloid known as whipped cream. Because milk is transformed from a colloid (cream) to a solid (butter) without changing its chemical makeup, turning milk into butter is a physical transformation. This change in the body can be undone.

Thus, there is a physical change even though the ingredients are still cream and air.

To learn more about the physical change, follow the link;

https://brainly.com/question/3680148

#SPJ1

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium bicarbonate \((NaHCO_3)\) is:

\(HCl + NaHCO_3\ - > NaCl + CO_2 + H_2O\)

The coefficients in the balanced equation show that 1 mole of HCl reacts with 1 mole of \(NaHCO_3\) to produce 1 mole of NaCl, 1 mole of \(CO_2\), and 1 mole of \(H_2O\). We need to find the number of moles of \((NaHCO_3)\) present in the tablet.

2 grams of \(NaHCO_3\) is equivalent to 0.02 moles, and 18 grams of HCl is equivalent to 0.45 moles. Since \((NaHCO_3)\) is limiting reagent, only 0.02 moles of NaCl and \(CO_2\) will be produced. The molar mass of \(CO_2\) is 44 g/mol, so the mass of \(CO_2\) produced is 0.88 g. The molar mass of NaCl is 58.44 g/mol, mass of NaCl produced is 1.17 g.

To know more about hydrochloric acid, here

brainly.com/question/15231576

#SPJ1

Answer: Two substances have different properties because they are made of different types and numbers of atoms that repeat.

Explanation: According to the article “Atomic Zoom-In”, all matter is made of tiny pieces called atoms, and there are 118 different types of atoms in the universe. Every substance is made of a unique combination of atoms, which can be represented by a chemical formula. The chemical formula shows the types and numbers of atoms that repeat to make up a substance.

For example, water has a chemical formula of H2O, which means it is made of groups of 2 hydrogen atoms and 1 oxygen atom. Substances have different properties because they are made of different types and numbers of atoms that repeat.

For example, water and ethanol are both clear liquids, but they have different properties such as boiling point, density, and flammability. This is because water is made of H2O groups, while ethanol is made of C2H6O groups.

The different types and numbers of atoms affect how the molecules interact with each other and with other substances, resulting in different properties. Therefore, to explain why two substances have different properties, we need to look at their chemical formulas and see how their atoms differ.

Hope this helps, and have a great day! =)

Answer:

I can say that knowledge of separating mixtures can help us in daily life and within society in the following ways:

1. Purification of water: Separation techniques are used to purify water for drinking and industrial purposes. It is essential to remove impurities from water to prevent diseases.

2. Recycling: Separation techniques are used to separate materials for recycling. This helps reduce the amount of waste in landfills and helps conserve resources.

3. Food industry: Separation techniques are used in the food industry to separate unwanted particles from food products. This helps ensure that the food we eat is safe and free from contaminants.

4. Medicine: Separation techniques are used in the pharmaceutical industry to separate and purify chemicals for use in medicine. This helps ensure that medicines are safe and effective.

5. Environmental protection: Separation techniques are used to remove pollutants from the environment. This helps protect our natural resources and prevent pollution-related health problems.

6. Oil and gas industry: Separation techniques are used to separate crude oil and natural gas into their various components. This helps in the production of energy and other useful products.

In summary, knowledge of separating mixtures is essential in our daily lives and within society. It helps ensure that we have access to safe and clean water, food, medicine, and energy, and also helps protect the environment.

Explanation:

Answer:

An atom contains three basic particles namely protons, neutrons and electrons. The nucleus of the atom contains protons and neutrons where protons are positively charged and neutrons are neutral. The electrons are located at the outermost regions called the electron shell.

Answer:

which property is least helpful in identifying a sample of matter is (B) VOLUME

Explanation:

volume depend on the amount of substance present and are not useful in the identification of a sample of matter. volume is an extensive property so it is not useful identifying the sample of matter.

\(0.225 moles\) of nitrogen gas are produced when\(36.0 g\) of NH4NO3 reacts.

The reaction for the decomposition of ammonia nitrate (NH4NO3) is given by:

NH4NO3 → N2 + 2H2O

The number of moles of nitrogen gas (N2) produced when 36.0 g of NH4NO3 reacts can be determined using the following steps:

1. Calculate the molar mass of NH4NO3.

\(Molar mass of NH4NO3 = (1 *14.007 g/mol) + (4 *1.008 g/mol) + (3 * 14.007 g/mol) \\ = 80.042 g/mol\)

2. Calculate the number of moles of NH4NO3 present in the given mass.

Number of moles =\(\farc{Mass}{Molar mass}\\ = \frac{36.0 g}{80.042 g/mol}\\ = 0.45 moles\)

3. Calculate the number of moles of nitrogen gas produced.

Number of moles of N2 produced = \(\frac{0.45 moles}{2 }= 0.225 moles\)

Therefore,36.0 g of NH4NO3 react with oxygen to generate g of nitrogen gas  \(0.225 moles\).

learn more about nitrogen gas Refer:brainly.com/question/10069872

#SPJ4

The peroxide addition would yield a product that is different from the antiperoxide addition

Markovnikov's rule states that when a protic acid HX is added to an alkene, the acid hydrogen (H) forms a bond with the carbon atom that has the greatest number of hydrogen atoms, while the halide (X) group forms a bond with the carbon atom that has the fewest hydrogen atoms.

This can be summed up with the phrases "the rich get richer" and "the poor get poorer" in terms of hydrogen. This fundamental principle of alkene chemistry aids in predicting the results of addition reactions.

Learn more about alkene:https://brainly.com/question/17017195

#SPJ1

Answer:

\(m_{AgNO_3}=577.6mg\)

Explanation:

Hello there!

In this case, according to the given chemical reaction, it is first necessary to compute the moles of reacting LiOH given its molar mass:

\(n_{LiOH}=81.5mg*\frac{1g}{1000mg}*\frac{1mol}{23.95g} =0.0034molLiOH\)

Thus, since there is a 1:1 mole ratio between lithium hydroxide and silver nitrate (169.87 g/mol) the resulting milligrams turn out to be:

\(m_{ AgNO_3}=0.0034molLiOH*\frac{1molAgNO_3}{1molLiOH} *\frac{169.87gAgNO_3}{1molAgNO_3} *\frac{1000gAgNO_3}{1gAgNO_3} \\\\m_{AgNO_3}=577.6mg\)

Best regards!

Answer:

AgNO3+Li-->LiNO3+Ag

It is already balanced.

And turns out to be M AgNO3=577.6mg

Hope this helps!

The general form of a neutralization reaction is HF + FrOH → FrF + H₂O

We refer to this as a neutralisation reaction. Only this reaction, which produces NaCl and water as products, is a neutralisation reaction since it involves HCl and NaOH. The resulting response is listed below: NaCl(aq) + H₂O = HCl(aq) + NaOH(aq) (l)

The interaction of H⁺ ions and OH⁻ ions produces water in a neutralisation reaction, which occurs when an acid and a base combine to make water and a salt. The neutralisation of a strong acid and strong base yields a pH of 7.

To know more about reaction visit:-

https://brainly.com/question/28984750

#SPJ1

The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.

For carbon:

Mass of carbon = 86.0% × 100.0 g = 86.0 g

For hydrogen:

Mass of hydrogen = 14.0% × 100.0 g = 14.0 g

Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.

The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.

First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.

Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol

Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol

Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.

Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939

Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.

Carbon: Hydrogen ≈ 2 : 3.878

Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.

for such more questions on hydrogen

https://brainly.com/question/24433860

#SPJ8