The vat is made of metal. Why might it matter that the material from which the vat is made is metal? (Think about how the man could have come in contact with the metal)

Answer:

Homologous chromosome

Answer:

B

Explanation:

Conductors are able to conduct electricity and temperature. Most of the metals, metalloids and alloys are conducting. Like iron (Fe) nickel is a good conductor.

Conductivity is a physical property of substances indicates the ability to conduct heat and electricity. Substances like metals are conductors because of the presence of free electrons in them.

The flow of free electrons in solids make the substance conducting. Substances which does not conduct is called insulators and those which conduct partially is called semiconductors.

Gases and liquids with fewer electrons are not conducting. Thus bromine is not a conductor. Krypton is a noble gas and is not conducting, potassium does not conduct electricity but it is thermally conducting.

Hence nickel (Ni) is the element having similar conductivity of iron. Thus option B is correct.

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Answer:

The more energy needed, the higher the melting point or boiling point . Since the electrostatic forces of attraction between oppositely charged ions are strong, their melting and boiling points are high.

Explanation:

hope this helps.

the molar concentration should be atleast 5mL off the solution since its disolved

Answer:

8.3

Explanation:

Convert mL to L.

12 mL×1 L1000 mL=0.012 L

Solve for molarity.

Molarity=moles of solute

liters of solution=0.10 mol0.012 L=8.3 M

The symbοls fοr these elements are:

A chemical element is a chemical substance that cannοt be brοken dοwn intο οther substances. The basic particle that cοnstitutes a chemical element is the atοm, and each chemical element is distinguished by the number οf prοtοns in the nuclei οf its atοms, knοwn as its atοmic number.

Fοr example, οxygen has an atοmic number οf 8, meaning that each οxygen atοm has 8 prοtοns in its nucleus. This is in cοntrast tο chemical cοmpοunds and mixtures, which cοntain atοms with mοre than οne atοmic number.

The chemical elements that meet the given criteria (atοmic number less than 15 and atοmic mass greater than 23.9u) are:

Therefοre, the symbοls fοr these elements are:

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Answer:

Is D

Explanation:

hope this is helpful

Monosaccharides and disaccharides dissolve in water because they have hydrophilic groups, which form hydrogen bonds with water molecules.

This allows the sugar molecules to be surrounded by water molecules, and therefore dissolve in water.Water is a polar solvent and therefore interacts well with other polar solutes. Hydrophilic groups found in both monosaccharides and disaccharides such as hydroxyl groups and carbonyl groups (C=O) are soluble in water, making these sugar molecules soluble in water.

Because the solubility of any substance is dependent on the polarity of the solvent and solute, it is the presence of the hydrophilic groups found in sugars that allows them to dissolve in water. This allows the sugar molecules to be surrounded by water molecules, and therefore dissolve in water.Water is a polar solvent and therefore interacts well with other polar solutes.

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Answer:

0.241 M

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

HBr + NaOH —> NaBr + H₂O

From the balanced equation above,

The mole ratio of acid, HBr (nₐ) = 1

The mole ratio of base, NaOH (n₆) = 1

Finally, we shall determine the concentration of the NaOH solution. This can be obtained as follow:

Volume of base, NaOH (V₆) = 20 mL

Volume of acid, HBr (Vₐ) = 24.1 mL

Concentration of acid, HBr (Cₐ) = 0.2 M

Concentration of base, NaOH (C₆) =?

CₐVₐ / C₆V₆ = nₐ/n₆

0.2 × 24.1 / C₆ × 20 = 1/1

4.82 / C₆ × 20 = 1

Cross multiply

C₆ × 20 = 4.82

Divide both side by 20

C₆ = 4.82 / 20

C₆ = 0.241 M

Therefore, the concentration of the NaOH solution is 0.241 M

The original volume of HBr that was titrated can be calculated as the ratio of the moles of HBr to its concentration.

To determine the original volume of HBr that was titrated, we can use the concept of stoichiometry and the equation balanced for the neutralization reaction between HBr and KOH.

The balanced equation is:

HBr + KOH → KBr + H₂O

From the balanced equation, we can see that the stoichiometric ratio between HBr and KOH is 1:1. This means that for every mole of HBr, we need an equal number of moles of KOH to complete neutralization.

First, let's determine the moles of KOH used in the titration:

Moles of KOH = 0.500 M × 0.075 L = 0.0375 mol

Since the stoichiometric ratio is 1:1, this also represents the number of moles of HBr that were neutralized.

Now, we can calculate the original volume of HBr using the concentration of the unknown solution:

Moles of HBr = 0.0375 mol

Concentration of HBr = unknown (let's assume it is C mol/L)

Volume of HBr = Moles of HBr / Concentration of HBr = 0.0375 mol / C mol/L

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Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

The inlet pressure of the pipeline in (bar) is 6.7 bar. To calculate the inlet pressure of the pipeline, we can use the Darcy-Weisbach equation.

Darcy-Weisbach equation relates pressure drop, flow rate, pipe characteristics, and fluid properties. The equation is given as:

ΔP = (fLρV²) / (2D) where:

ΔP is the pressure drop

f is the Darcy friction factor

L is the length of the pipeline

ρ is the density of water

V is the velocity of water

D is the diameter of the pipeline

First, we need to convert the flow rate from m³/hr to m³/s:

Flow rate = 27 m³/hr = (27/3600) m³/s = 0.0075 m³/s

Next, we need to calculate the velocity of water:

Area of the pipeline =\(\pi \times \frac {(76/1000)^2}{4} = 0.004556 m^2\)

Velocity
= Flow rate / Area of the pipeline
= 0.0075 m³/s / 0.004556 m² = 1.646 m/s

Now, we can calculate the pressure drop using the Darcy-Weisbach equation. Since we need to calculate the inlet pressure, we assume ΔP is the difference between the outlet pressure and the inlet pressure:

ΔP = (fLρV²) / (2D)

\(\triangle P = \frac {(0.015 \times 4000 \times 1000 \times 1.646^2)}{(2 \times 0.076)} = 10.69 \times 10^5 Pa\)

= 10.7 bar (approx)

Rearranging the equation to solve for the inlet pressure:

Inlet pressure = ΔP - outlet pressure = 10.7 bar - 4 bar = 6.7 bar

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Answer:

i think answer is a, every 30 days

Answer:

Once every 28 days

Explanation:

I am not 100% sure because i am not female but i do remember that in my health class it said it was once every 28 days

Answer:

I think the answer is chemical energy

Explanation:

Answer: Florida

Explanation:

jus did it

Answer:

B. Florida

Explanation:

Answer:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Explanation:

Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e

Enthalpy change = Heat of product – Heat of reactant

ΔH = Hp – Hr = negative

Considering the options given in the question above, the correct answer is:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Explanation:

\(5mol \times \frac{22.4lit}{1mol} = 112lit\)

Answer:

Cu₂O

Explanation:

Copper(I) oxide or cuprous oxide is the inorganic compound with the formula Cu₂O. It is one of the principal oxides of copper, the other being or copper (II) oxide or cupric oxide. This red-coloured solid is a component of some antifouling paints.

1284.689 grams of sodium nitrate will be produced from 15.1 moles of silver nitrate.

To determine how many grams of sodium nitrate will be produced from 15.1 moles of silver nitrate, we need to perform a balanced equation and stoichiometry calculation.

The balanced equation for the reaction between silver nitrate and sodium chloride to form silver chloride and sodium nitrate is:

AgNO3 (aq) + NaCl (s) → AgCl (s) + NaNO3 (aq)

We know that 15.1 moles of silver nitrate will react with the stoichiometric amount of sodium chloride, which is 1 mole of sodium chloride for every 1 mole of silver nitrate.

So, we can calculate the moles of sodium nitrate that will be produced by multiplying the moles of silver nitrate by the coefficient of sodium nitrate in the balanced equation:

15.1 moles AgNO3 * 1 mole NaNO3 / 1 mole AgNO3 = 15.1 moles NaNO3

To convert the moles of sodium nitrate to grams, we can use the molar mass of sodium nitrate, which is 84.99 g/mol.

15.1 moles NaNO3 * 84.99 g/mol = 1284.689 g

So, 1284.689 grams of sodium nitrate will be produced from 15.1 moles of silver nitrate.

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The number of mole of Al₂O₃ produced when 0.60 mole of Fe is produced is 0.2 mole

We'll begin by obtaining the mole of Al that reacted to produce 0.6 mole of Fe. Details below:

2Al + 3FeO -> 3Fe + Al₂O₃

From the balanced equation above,

3 moles of Fe were produced from 2 moles of Al

Therefore,

0.6 mole of Fe will be produce from = (0.6 × 2) / 3 = 0.4 mole of Al

With the above information, we can determine the number of moles of Al₂O₃ produced. This can be obtained as follow:

From the balanced equation above,

2 moles of Al reacted to produce 1 mole of Al₂O₃

Therefore,

0.4 moles of Al will react to produce = (0.4 × 1) / 2 = 0.2 mole of Al₂O₃

Thus, number of mole of Al₂O₃ produced is 0.2 mole

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Answer:

2(mass no of magnisium)+mass of barium

plug in the values

The interaction described, where an alpha particle (helium-4 nucleus) interacts with an oxygen-16 nucleus to form a neon-20 nucleus, exemplifies a nuclear reaction known as nuclear fusion.

Nuclear fusion is the process in which two or more atomic nuclei come together to form a heavier nucleus. In this case, the alpha particle (helium-4 nucleus) is fusing with the oxygen-16 nucleus to produce a neon-20 nucleus. Nuclear fusion reactions involve the release of a significant amount of energy due to the conversion of mass into energy, as described by Einstein's famous equation E = mc^2. This energy release is the driving force behind processes like the sun's energy production and the development of hydrogen bombs.

The fusion of light elements, such as the fusion of hydrogen isotopes in stars, is responsible for the immense energy output and is a fundamental process in the universe. In this specific reaction, the fusion of an alpha particle with an oxygen-16 nucleus leads to the formation of a heavier nucleus, neon-20, and is an example of a nuclear fusion reaction.

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Explanation:

from;

K2CO + 2AgNO = 2KNO + Ag2CO

Data

V(K2CO)= 200.0mL =0.2L

[K2CO]=0.0500M

V(AgNO)=300.0mL =0.3L

[AgNO]= 0.100M

For that of K2CO

from, amount of subtance = [ K2CO] × V( K2CO)

n(K2CO)= 0.0500× 0.2

= 0.10 mol

For that of AgNO

from, amount of subtance = [ AgNO] × V( AgNO)

n(AgNO)= 0.100× 0.3

= 0.30 mol

The amount of Ag+ ions present will be;

*0.30-0.1/2)

(0.30- 0.05)

n(Ag+)= 0.25mol

Answer:

because it could be harmful and dangerous for our health. like some substances can be acid so if we taste it we can die.

Explanation:

Answer:

Explanation:

There are several reasons why we should not taste unknown substances:

Health risks: The unknown substance may be toxic or harmful to our health, and tasting it can lead to serious health issues or even death.

Allergic reactions: We may be allergic to some substances, and tasting them can cause severe allergic reactions.

Unpleasant taste: The substance may have a terrible taste, and tasting it can cause discomfort or nausea.

Contamination: The unknown substance may be contaminated, and tasting it can lead to the spread of harmful bacteria or viruses.

Legal issues: Tasting unknown substances can be illegal in some cases, such as trying drugs or other illegal substances.

In conclusion, it is always advisable to avoid tasting unknown substances. If you come across something you are unsure about, it is best to seek professional help or advice rather than risking your health or safety.

Until all of the ice has melted, the mixture's temperature doesn't change at all; after that, it starts to rise steadily.

The average energy of every molecules and atoms in a substance is what chemists refer to as the substance's temperature. The kinetic energy of a substance's constituent particles varies.

Temperature is a unit used to represent hotness or coolness on any of a number of scales, including F and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a warmer pressure) to a colder (body with a temperature lower) .

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Answer:

Mass of MgF₂ formed = 40.5 g

Explanation:

Given data:

Mass of NaF = 55 g

Mass of MgF₂ formed =  ?

Solution:

Chemical equation:

2NaF  +  Mg      →     MgF₂ + 2Na

Number of moles of NaF:

Number of moles = mass/molar mass

Number of moles = 55 g / 41.98 g/mol

Number of moles = 1.3 mol

now we will compare the moles of sodium fluoride with magnesium fluoride.

                     NaF       :          MgF₂

                       2          :             1

                     1.3          :        1/2×1.3 =  0.65 mol

Mass of magnesium fluoride:

Mass = number of moles × molar mass

Mass = 0.65 mol × 62.3 g/mol

Mass = 40.5 g

LDA (Lithium Diisopropylamide) is a better base than butyllithium for the deprotonation of a ketone because it is a more selective and less reactive base.

LDA's bulky structure reduces the chance of unwanted side reactions, such as nucleophilic attack on the carbonyl group.

This selectivity allows for the controlled formation of an enolate ion, which can participate in various organic reactions.

On the other hand, butyllithium is a strong and more reactive base that can lead to multiple unwanted reactions and less control over the deprotonation process. Thus, LDA is preferred for the deprotonation of ketones.

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1.194 mol

(remember to use sig figs!)

1.19 moles are present in 356.4 g of NiBr3

A mole is defined as 6.02214076 × \(10^{23}\) of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Molar mass of \(NiBr_3\)

58.6934 + 3 x 79.904 = 298.4054

\(Moles = \frac{mass}{molar \;mass}\)

\(Moles = \frac{356.4 g}{298.4054}\)

Moles =1.19434836 =1.19 moles

Hence, 1.19 moles are present in 356.4 g of NiBr3.

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