1.What is the formula for manganese (II) fluoride?
2. What is the correct name for the ionic compound K3PO4?
3. What is the correct name for the ionic compound Fe(NO2)2?

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The two elements that do not have a second energy levels are Hydrogen (H) and Helium (He)

Energy levels are nothing but the 3-D spaces around the nucleus of an atom. The electrons revolve around the nucleus in their respective energy levels. Each energy levels can accommodate only a particular number of electrons.

For example, first energy level can accommodate only a maximum of 2 electrons whereas second energy level can accommodate 8 electrons.

Hydrogen has 1 electron and helium has 2 electrons around their respective nucleus. In both hydrogen and helium, electrons are accommodated in the first energy level.

Hence, the two elements that do not have a second energy levels are Hydrogen (H) and Helium (He)

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Answer:

d

Explanation:

i think it's d, but I'm not sure. my answer is a little different but maybe i used a different number for the density of lead (11.35g/cc)

Answer:

Hydroxyl

Explanation:

A P E X

1. Ensure Clear and Visible Placement: Machine controls should be located in a position that is easily accessible, visible, and within reach of the equipment operator. Clear and intuitive labeling or color-coding can also be used to enhance visibility and assist in identifying the controls quickly.

2. Provide Adequate Guarding: The machine controls should be positioned in a manner that minimizes the risk of accidental activation or unintended operation. This can be achieved by incorporating appropriate guarding or barriers around the controls to prevent inadvertent contact or interference.

3. Consider Ergonomics and Operator Comfort: When determining the location of machine controls, it is essential to consider ergonomic principles and operator comfort. Controls should be positioned in a way that allows operators to maintain a comfortable and natural posture while operating the equipment. This can help reduce the risk of operator fatigue, musculoskeletal disorders, and errors due to discomfort or awkward reach.

These rules aim to promote operator safety, minimize the potential for accidents, and ensure efficient and effective control of equipment involving fluid power components.

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The coefficients in a balanced equation can be used as molar ratios, which can act as conversion factors to relate the reactants to the products. These conversion factors state the ratio of reactants that react but do not tell exactly how much of each substance is actually involved in the reaction.

Answer:

This is an example of selective breeding

The total work produced by the steam engine needs to be calculated and given that the steam engine accepts heat during isothermal expansion at 250 °C and discards heat through isothermal compression at 25 °C.

The magnitude of the entropy change during the isothermal compression step is 750 J/K. The efficiency of the steam engine is 65% of the maximum attainable theoretical efficiency. Given that the efficiency of the steam engine is 65% of the maximum attainable theoretical efficiency.

Hence, the actual efficiency will be:

η_actual = η_max × 0.65Where,

η_max is the maximum attainable theoretical efficiency.

η_actual = 0.65 × η_maxNow,

the efficiency of a Carnot engine (η_Carnot) can be given as:η_Carnot = 1 - (T_cold / T_hot)Here, T_hot and T_cold are the temperatures of the hot and cold reservoirs respectively.

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Work is a measure of the energy transfer that occurs when an object is moved against a force. Work is defined as the product of the force applied to an object and the displacement of the object in the direction of the force. Hence the total work produced by the engine is 47,175 J.

1. Converting the temperatures from degrees Celsius to Kelvin.

T1 = 250 °C + 273.15 K = 523.15 K

T2 = 25 °C + 273.15 K = 298.15 K

2. The maximum attainable theoretical efficiency.

ηmax = 1 - T2 / T1 = 1 - 298.15 / 523.15 = 42.9%

3. The efficiency of the steam engine.

η = 0.65 * ηmax = 0.65 * 42.9% = 27.7%

4. The entropy change during the isothermal expansion step.

dS = 750 J/K

5. The total work produced by the engine.

W = η * (T1 - T2) * dS = 0.277 * (523.15 - 298.15) * 750 J/K = 47,175 J

Therefore, the total work produced by the engine is 47,175 J.

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Answer:

F=500×3 = 1500 N

W = 1500×10 =15000 Nm

To produce 35.5g of H2, approximately 2055.49g of NaCl is required.

To calculate the mass of NaCl required to produce 35.5g of H2, we need to determine the stoichiometry of the reaction and use the molar mass of NaCl.

The balanced equation for the reaction is:

2NaCl + 2H2O -> 2NaOH + H2

From the balanced equation, we can see that for every 2 moles of NaCl, 1 mole of H2 is produced. We can use the molar mass of H2 (2.016g/mol) to convert the given mass of H2 into moles:

moles of H2 = mass of H2 / molar mass of H2

moles of H2 = 35.5g / 2.016g/mol

moles of H2 = 17.6 mol

Since the stoichiometry of the reaction is 2 moles of NaCl to 1 mole of H2, we can set up the following ratio:

moles of NaCl / moles of H2 = 2 / 1

Rearranging the equation to solve for moles of NaCl:

moles of NaCl = (moles of H2 * 2) / 1

moles of NaCl = (17.6 mol * 2) / 1

moles of NaCl = 35.2 mol

Now, we can calculate the mass of NaCl required using the molar mass of NaCl (58.44g/mol):

mass of NaCl = moles of NaCl * molar mass of NaCl

mass of NaCl = 35.2 mol * 58.44g/mol

mass of NaCl = 2055.49g

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when sodium carbonate reacts with a dilute acid carbondioxide is produces

Answer:  carbon dioxide

Explanation:  a salt, carbon dioxide, and water are formed in this reaction

Answer:

Explanation:

First of all, let's differentiate between a physical and a chemical change.

A physical change has the following properties

- no new substance is formed

- change is easily reversible

- it mostly involves physical properties (like size)

- examples include burning of candle wax and freezing of water to become ice

A chemical change has the following properties

-new substances are formed

- change is not easily reversible

- it involves both physical and chemical properties (like surface area and reactivity)

- examples include burning of wood and rusting of iron

From the above, it is clear that burning of a log of wood is a chemical change because the wood is burnt in open air (by a chemical process known as combustion) and converted to coal and then ashes. The produced ash cannot be reversed back to wood. The energy change that occurs here (in the combustion) is from chemical energy to heat energy. Which is unrelated to the energy changes that occurs in a swinging/moving pendulum, which is the conversion of potential energy (energy at rest) to kinetic energy (energy in motion). The energy changes in a moving pendulum is not a physical change, which is where the classmate got it wrong.

Hence, she (the classmate) is right about the energy changes been unrelated but she is wrong in her explanation of the process/energy changes involved.

Answer:

So the concentration of hydrogen in solution of 1.65 pH is 2.2 × 10⁻²

The Light Is- Electric To Radiant

Car Battery- Chemical To Electric

Wind Thingy- Motion To Electric

Fan- Electric To Motion

Guitar- Electric To Sound

Hope This Helps!!

The three-dimensional representation (using wedges and dashed lines) of acetic acid (CH₃COOH) is in the image attached.

The wedge represents a bond coming out of the plane of the paper towards you, and the dashed line represents a bond going into the plane of the paper away from you. In this representation, the hydrogen atoms and the hydroxyl group are both in front of the plane of the paper, while the carbon and oxygen atoms are behind the plane.

The wedge is used to indicate that the hydrogen atom attached to the carbon is closer to you, while the dashed line indicates that the oxygen atom is further away from you. This is just one of many possible ways to represent the three-dimensional structure of acetic acid.

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When sequencing a protein, it is necessary to break disulfide bonds within a polypeptide chain. Iodoacetate is used to break the disulfide bonds in a polypeptide chain. Disulfide bonds can be found within the polypeptide chains of some proteins.

The bonds are formed when two sulfhydryl (-SH) groups on cysteine residues are oxidized to produce a covalent bond between them.

Iodoacetate is a reagent used to break disulfide bonds within a polypeptide chain. It works by reacting with the thiol group (-SH) of cysteine residues to form S-carboxyamidomethyl-cysteine. This reaction prevents the formation of disulfide bonds between cysteine residues.

When the polypeptide chain is cleaved with a protease, the resulting peptides will contain S-carboxy amido methyl-cysteine instead of cysteine, indicating that the disulfide bond has been broken.

Additionally, a reducing agent such as dithiothreitol (DTT) is often used to reduce any disulfide bonds that may have reformed during the sequencing process.

Iodoacetate is commonly used for protein sequencing because it is a relatively mild reagent that is specific to cysteine residues. It does not react with other amino acid residues, making it ideal for selective reduction of disulfide bonds.

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Student 1 is correct. He discovered the mistake as;

If the spot was placed below the solvent level, this would cause the sample to be dissolved into the solvent pool before traveling up the plate.

TLC should be positioned so that just the lowest edge of the plate touches the solvent.

Differential affinities (strength of adhesion) of the analyte components towards the stationary and mobile phases result in differential separation of the components. Affinity, in turn, is determined by two molecular properties: adsorption and solubility.

Adsorption is the property of how well a component of a mixture clings to the stationary phase, whereas solubility is the quality of how well a component of a mixture dissolves in the mobile phase.

The greater the adsorption to the stationary phase, the slower the molecule will move across the column.

The more the molecule adsorbs to the stationary phase, the slower it moves across the column.

The greater the molecule's solubility in the mobile phase, the faster it will travel across the column.

Thus, Student 1 is correct. He detected the error by placing the area below the solvent level, which caused the sample to disintegrate into the solvent pool before migrating up the plate.

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The amount of carbon flux in the atmosphere will be 3.3 GtC/yr

The carbon flux in the atmosphere can be calculated by:

1. Removing the amount of carbon that leaves the atmosphere from the amount that enters the atmosphere.

2. Adding the amount of carbon released by fossil fuel burning.

Thus,

Carbon flux = 211.6 - 213.8 + 5.5 = 3.3 GtC/yr

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Solubility means the ability of a solute to dissolve in solvent to form a solution.

Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a particular temperature.

The solute can be a solid, liquid or a gas.

The solubility of a solid or a liquid solute in a solvent is affected by the temperature, while the solubility of a gaseous solute is affected by both the temperature and the pressure of the gas.

Therefore, Solubility means the ability of a solute to dissolve in solvent to form a solution.

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Answer:

The Correct option is "+1"

Answer:

B. electric energy then chemical energy

Explanation:

Answer:

Chromate Chemical Formula

Explanation:

The formula of chromate is CrO42-. The chromate ion usually consists of one chromium atom (+6 oxidation state) and four oxide atoms. The overall charge is -2.

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After 15 years, there would be approximately 1.25 grams of Co-60 remaining.

We need to figure out how many half-lives have transpired in order to compute the amount of Co-60 that is still there after 15 years.

Given that Co-60 has a half-life of 5 years, the number of half-lives that have passed can be determined by dividing the total duration by the half-life:

Half-life divided by total time equals the number of half-lives.

15 years divided by 5 years equals three half-lives.

The quantity of radioactive material is divided in half for each half-life, thus we can determine the remaining quantity as follows:

Initial Amount x (1/2) = Remaining Amountthe quantity (half-lives)

The remainder is equal to 10 grammes times (1/2)3 (10 grammes times (1/8) = 1.25 grammes).

Therefore, there would be roughly 1.25 grammes of Co-60 left after 15 years.

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Answer:yes

Explanation:

this is because the distance doesnt matter

Answer: 526 grams of Ag3PO4.

Explanation:

First, we need to calculate the number of moles of Silver Nitrate (AgNO3) present in 245 grams:

245 g AgNO3 / 169.88 g/mol AgNO3 = 1.444 mol AgNO3

The balanced chemical equation for the reaction between AgNO3 and Ag3PO4 is:

3 AgNO3 + Ag3PO4 → 3 Ag3PO4 + NO3

We can see that for every 3 moles of AgNO3 reacted, we get 1 mole of Ag3PO4 produced. Therefore, the number of moles of Ag3PO4 produced is:

1.444 mol AgNO3 / 3 mol AgNO3 per 1 mol Ag3PO4 = 0.481 mol Ag3PO4

Finally, we can use the molar mass of Ag3PO4 to convert from moles to grams:

0.481 mol Ag3PO4 × 418.58 g/mol Ag3PO4 = 201.18 g Ag3PO4

Therefore, 245 grams of AgNO3 will produce 201.18 grams of Ag3PO4.

The balanced chemical equation for the reaction between iron (Fe) and nitrogen (N) to form iron nitride (Fe2N) is: 6 Fe + N2 → 2 Fe2N

This equation is balanced because there are equal numbers of atoms of each element on both sides of the arrow, and the ratio of the reactants and products is 6:1 for Fe and N2, and 2:1 for Fe2N.

To balance the equation, we need to make sure that the number of atoms of each element is the same on both sides of the equation. Here's how we can do it:

On the LHS, we have 6 atoms of Fe and 2 atoms of N (since N2 consists of 2 nitrogen atoms bonded together).

On the RHS, we have 4 atoms of Fe (2 atoms in each Fe2N molecule) and 2 atoms of N (1 atom in each Fe2N molecule).

To balance the equation, we can multiply the reactants by 3 to get 6 Fe atoms and 6 N atoms:

6 Fe + 3 N2 → 2 Fe2N

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Answer should be:

Cells

Answer:

similar cells and their intercellular material

Explanation:

cells make tissues which make organs

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