1. what is added to iron to form stainless steel? 2. statues are often made of the alloy bronze. what metals are used in this alloy? 3. copper is used for water pipes because it is easy to bend. taps are usually made of stainless steel rather than copper. why? 4. gold is very soft but it can be made harder by adding other metals. which other metals are used? 5. what is the alloy brass made from?

Sample left = 6.25 g

The percentage = 6.25%

Given

t1/2 = half-life = 3.8 days

t = decay time = 15.2 days

No = initial sample = 100 g

Required

Nt = final sample left

The percentage

Solution

General formulas used in decay:  

\(\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}\)

Input the value :

\(\tt N_t=100.\dfrac{1}{2}^{15.2/3.8}\\\\N_t=100.\dfrac{1}{2}^4\\\\N_t=6.25~g\)

The percentage : Nt/No

6.25 : 100 = 6.25%

When calcium ions (Ca²⁺) move out of a neuron, they carry positive charges with them. As a result, the area outside the neuron, where the calcium ions are moving to, would experience a net loss of positive charge. Therefore, the overall charge outside C. the neuron would become more negative.

An atom consists of protons, neutrons, and electrons. Protons carry a positive electric charge, electrons carry a negative electric charge, and neutrons have no net electric charge. The charge of a proton is +1, the charge of an electron is -1, and the charge of a neutron is 0.

Neutrons are subatomic particles found in the nucleus of an atom along with protons. Protons have a positive charge and help determine the atomic number and identity of the element, while neutrons have no charge.

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The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.

The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.

In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.

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Acetic acid and sodium hydroxide used to make a buffer solution.

What is buffer solution?

buffer solution is a waterproof solvent based solution in  which consists of a mixture of  containing a weak acid and  the conjugate base of the weak acid, or a weak base of the solution and the conjugate acid of the weak base. They resist to a  change in pH upon to the  dilution or upon the addition of small amounts of a  acid/alkali to them. Buffer solution resist of a  change in pH when smallest amounts of a stronger acid or a stronger base are added.

Sol-Acetic acid is a weaker acid and  its conjugate base is the acetate anion. That's why the addition of the strong base, hydroxide, which neutralized half of a  acetic acid created a buffer and  solution because we are having  significant amounts of both acetic acid and its conjugate base, the acetate anion, in the solution.

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Balanced nuclear equation by giving the mass number, atomic number, and element symbol for the missing species is ¹⁰B + ⁴He → ¹⁴N + 1¹H

The missing species in the given nuclear equation is ¹⁴N and 1¹H.

Let's write the mass number, atomic number, and element symbol for the missing species:

Mass number of ¹⁴N = 14

Atomic number of ¹⁴N = 7

Element symbol of ¹⁴N = N (since the atomic number of nitrogen is 7)

Mass number of 1¹H = 1Atomic number of 1¹H = 1

Element symbol of 1¹H = H (since the atomic number of hydrogen is 1)Therefore, the main answer of the balanced nuclear equation is: ¹⁰B + ⁴He → ¹⁴N + 1¹H.

In order to balance a nuclear equation, it is essential that the total mass number and the total atomic number is conserved.

Balancing nuclear equations requires both the knowledge of atomic structure as well as knowledge of the laws of conservation of mass and charge.

A balanced nuclear equation is essential in understanding nuclear reactions and in predicting the outcomes of nuclear reactions.The balanced nuclear equation for the given nuclear equation is:¹⁰B + ⁴He → ¹⁴N + 1¹H. Conclusion:Thus, the missing species in the given nuclear equation is ¹⁴N and 1¹H.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

volume = 34,000 L

density = 1.84 kg/L

We have

mass = 1.84 × 34,000 = 62,560

We have the final answer as

Hope this helps you

Answer: neutralization reaction

Explanation: In this reaction, the sodium hydroxide (NaOH) reacts with the acetic acid (CH3COOH) to produce sodium acetate (CH3COONa) and water (H2O). This is a type of acid-base reaction, where the NaOH is a strong base that reacts with the CH3COOH, a weak acid, to form the salt CH3COONa, which is a weak acid conjugate base, and water.

If you needed to produce 10.7 moles of water, 1927.7 g of glucose, C6H12O6 is needed for the preparation of the solution.

The term mole is defined as one mole of any substance is exactly equal to its atomic mass or molecular mass. It is expressed in grams. The symbol of mole is represented by mol.

1 mole = 6.023 X 10²³

Molar mass of C6H12O6 = 180.16 g/mol

Mole of C6H12O6 = 10.7 mole

Mass of C6H12O6 =.?

Mole = mass / molar mass

10.7 = mass of C6H12O6 / 180.16

Now, Cross multiply

Mass of C6H12O6 = 10.7 × 180.16

Mass of C6H12O6 = 1927.7 g

Thus,  1927.7 g of glucose, C6H12O6 is needed for the preparation of the solution.

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Answer:

Explanation:

Radiation from the sun heats the ground, then the ground heats the air by process of conduction. When that happens air temp. and density start to change causing air convection currents. Hope I help.

Your carbon dioxide emissions depend on various factors, such as your energy use, transportation, diet, and lifestyle choices. The average annual carbon dioxide emissions per person worldwide is approximately 5 metric tons (5,000 kilograms) per year.

Carbon dioxide (CO2) is a colorless, odorless, and non-flammable gas that is composed of one carbon atom and two oxygen atoms. It is a naturally occurring gas that is essential for life on Earth, as it plays a critical role in the carbon cycle and is necessary for photosynthesis, which is the process by which plants convert sunlight into energy. Carbon dioxide is also a greenhouse gas, which means it has the ability to trap heat in the Earth's atmosphere and contribute to climate change. Human activities, such as the burning of fossil fuels, deforestation, and industrial processes, have increased the levels of carbon dioxide in the atmosphere, leading to global warming and other climate-related issues.

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Answer:

Las fuentes de luz primarias son aquellas que emiten la luz que producen. Por ejemplo: la luz de Sol, un relámpago, la de una vela,...

A su vez las fuentes primarias las podemos clasificar en: fuentes naturales y fuentes artificiales

Explanation:

To produce 7.34 moles of CH4, we need 7.34 moles of C.

Answer: 7.3 moles of carbon are needed to make 117.4 grams of methane, CH4.

The molar mass of CH4 is 12 + 4(1) = 16 g/mol.

To determine how many moles of carbon are needed to produce 117.4 grams of CH4, we first need to calculate the number of moles of CH4 present in 117.4 grams of the compound.

Number of moles of CH4 = mass of CH4 / molar mass of CH4

Number of moles of CH4 = 117.4 g / 16 g/mol

Number of moles of CH4 = 7.34 mol

From the balanced chemical equation, we know that one mole of carbon reacts with two moles of hydrogen gas to produce one mole of methane.

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The given chemical equation is: 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O1Oxygen16Now, let us balance the given chemical equation by following the Law of Conservation of Mass.Balancing the chemical equation: 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O1Oxygen16Number of atoms on both sides of the chemical equation should be the same. Let's check one by one.Number of Copper (Cu) atoms:

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Answer:

2.18 × 10³L

Explanation:

2178 litres of CO2 is produced in the combustion reaction.

HOW TO CALCULATE VOLUME

Density = mass ÷ volume

no of moles. = 5.9 × 10²⁵ ÷ 6.02 × 10²³

no. of moles = 5.9/6.02 × 10²

no. of moles = 0.98 × 10²moles

= 98moles

Moles = mass ÷ molar mass

Mass of CO2 = moles × molar mass

Molar mass of CO2 = 12 + 16(2) = 44g/mol

Mass of CO2 = 98 × 44

Mass of CO2 = 4312g = 4.312kg

Volume = 4.312kg ÷ 1.98kg/m³

Volume = 2.178m³

Since 1m³ = 1000L

2.178m³ = 2.178 × 1000

= 2178 liters.

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A student sets up and solves the following equation to solve a problem in solution stoichiometry. The missing units are moles/L.

When requested to assess the division's units, we must consider that the units on the other side of the division will be canceled. In this case, considering the following dimensional analysis operation:

(0.63 mol) (1 mL/10⁻³ L)/(7.2mol/L) = 88. mL

Since they are used as both denominators and numerators, we can see that milliliters cancel each other out, resulting in moles/L as the final units.

Therefore, the missing units of equation (0.63 mol) (1 mL/10⁻³ L)/(7.2_) = 88. mL is moles/ L

Your question is incomplete but most probably your full question was

A student sets up and solves the following equation to solve a problem in solution stoichiometry. Fill in the missing part of the student's equation. (0.63 mol) (1 mL/10⁻³ L)/(7.2_) = 88. mL

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Answer:

1

Explanation:

Octet meaning 8. So if chlorine already has 7 valence electrons it will only need to get 1 more to be satisfied.

Answer:

The smallest atomic unit which maintains the physical properties of a compound is called a molecule.

Explanation:

A molecule is the smallest unit of a compound that can exist independently and still retain the properties of that compound. It is made up of two or more atoms that are bonded together, and it is the basic unit of a chemical compound. The atoms in a molecule are held together by chemical bonds, which are the attractive forces that hold the atoms together. Molecules can be made up of different types of atoms, and the type and arrangement of atoms in a molecule determine the properties of the compound.

This reddish-brown irritating gas that gives photochemical smog its brownish color and is also a major component of acid deposition is Nitrogen dioxide (NO2).

Nitrogen dioxide (NO2) is a reddish-brown gas that is a photochemical smog component. It's also a component of acid deposition when it's converted to an acid in the atmosphere. Nitrogen dioxide (NO2) is one of the major air pollutants that contribute to the formation of smog. It's generated from the burning of fossil fuels, particularly in high-temperature combustion processes that produce smog.

Nitrogen dioxide is formed when nitrogen in the atmosphere reacts with oxygen in the atmosphere.Nitrogen dioxide is one of the primary pollutants produced by motor vehicle exhausts. When nitrogen oxide (NO) and volatile organic compounds (VOCs) are released into the atmosphere by burning fossil fuels, they react with sunlight to create photochemical smog. Nitrogen dioxide, a secondary air pollutant, is produced as a result of this reaction. Nitrogen dioxide (NO2) is a reddish-brown gas that absorbs light at wavelengths below 400 nanometers, giving photochemical smog its brownish color.

Nitrogen dioxide (NO2) is a major component of acid deposition when it is converted in the atmosphere into an acid. Acid deposition is a type of precipitation that contains acidic substances, such as sulfuric acid and nitric acid. When acid deposition falls to the ground, it can cause damage to plant and animal life, as well as buildings and other structures.

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Answer:

They are always motion less

Explanation:

I hope that is an ok answer for you:)

Let me know if I can help you in any other ways

False. Chemical reactions reach equilibrium when the rates of the forward and reverse reactions become equal. This means that the amount of reactants and products present in the system remain constant over time.

While it is true that some reactions may appear to have reached equilibrium because one of the reactants is used up, this is not always the case. In some cases, the reaction may continue to occur, but at a slower rate, until equilibrium is reached. Additionally, some reactions may involve multiple reactants or products, making it more complex to determine if one reactant being used up is the sole reason for equilibrium being reached.
False. Chemical reactions generally reach equilibrium not because one of the reactants is used up, but because the rates of the forward and reverse reactions become equal. At equilibrium, the concentrations of reactants and products remain constant, but they do not necessarily become zero. The reaction continues to occur in both directions, but the net effect is zero, as the formation of products and consumption of reactants occur at the same rate. Equilibrium is a dynamic state that reflects the balance between the forward and reverse reactions.

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a. The number of grams of sodium oxide produced by 100 g Na would be 134.85 grams while the amount produced by 60 g oxygen would be 232.5 grams.

b. The mass of excess reactant left over at the conclusion of the reaction would be 24.624 grams of oxygen.

The unbalanced equation goes thus: \(Na + O_2 -- > Na_2O\)

First, we need to balance the equation of the reaction. This balanced equation is written as:

\(4 Na + O_2 -- > 2Na_2O\)

From the equation:

With 100 g Na:

Mole = 100/23

        = 4.35 moles

Equivalent mole of \(Na_2O\) = 4.35/2

                                          = 2.175 moles

Mass of 2.175 moles of \(Na_2O\) = 2.175 x 62

                                                 = 134.85 grams

Thus, 134.85 grams of \(Na_2O\) will be produced with 100g of Na.

With 60 g of oxygen:

Mole = 60/32

        = 1.875 moles

Equivalent moles of \(Na_2O\) = 1.875 x 2

                                           = 3.75 moles

Mass of 3.75 moles \(Na_2O\) = 3.75 x 62

                                           = 232.5 grams.

Thus, 232.5 grams of \(Na_2O\) will be produced with 60 g of oxygen.

To get the excess reactant:

Mole of 100 g Na = 4.35 moles

Mole of 60 g oxygen = 1.875 moles

Mole ratio of Na to oxygen = 4:1

Thus the excess reactant is oxygen.

Actual amount of oxygen = 4.35/4

                                           = 1.0875 moles

Excess mole of oxygen = 1.857 - 1.0875

                                       = 0.7695 moles

Mass of excess oxygen = 0.7695 x 32

                                       = 24.624 grams

Thus, the mass of the excess reactant left over after the conclusion of the reaction is 24.624 grams of oxygen.

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For an octahedral molecule with a formula of AX3Y3, there are two possible structures.

In an octahedral molecule, there are six bonding positions around the central atom, arranged in a symmetrical manner. The "A" represents the central atom, while "X" and "Y" represent different ligands or atoms bonded to the central atom. In the AX3Y3 formula, there are three "X" ligands and three "Y" ligands. The two possible structures that can be formed are the fac and mer isomers. In the fac isomer, three identical ligands (X) occupy one face of the octahedron, while the other three identical ligands (Y) occupy the opposite face. In the mer isomer, the three X and three Y ligands are alternately arranged around the octahedron. Therefore, there are two possible structures for an octahedral molecule with a formula of AX3Y3.

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Cellular Respiration is the process of breakdown of sugar molecules, especially glucose to yield energy in the form of ATP. Every organism undergoes cellular respiration.

Thus, cellular respiration is the process of the breakdown of glucose in the presence or absence of oxygen to yield energy.

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The electron configuration for Uranium (U) is based upon the placement of uranium in the fourth column of the actinide series or f block. Therefore the electron configuration for uranium must end as 5f4,

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4e14 5d10 6p6 7s2 5f4

This notation can be written in core notation or noble gas notation by replacing the : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4e14 5d10 6p6 with the noble gas [Rn].

[Rn] 7s2 5f4

I hope this was helpful.

To determine the amount of reactant used in grams and moles, as well as the product obtained in grams and moles, the reaction equation and stoichiometry of the reaction are essential.

The theoretical yield of the product can be calculated based on the balanced equation and the stoichiometry, while the percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100%.

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