A company needs a substance for a new product that is a good electrical insulator, is lightweight, and can withstand high pressures. Which type of scientist should the company contact for help? Choose the correct answer.


geophysicist

organic chemist

material scientist

analytical chemist

Answer:because they run out of energy when it is transferred and to other objects, or their kinetic energy

Explanation:

Answer: If you double the force you would have to double the Acceleration.

Explanation:Since the mass does not change as the acceleration increases, we can say that force is equal to acceleration. Therefore, if you double the force you double the acceleration.

The mole ratio of oxygen to pentane in the balanced equation is 8:1.

In the given equation, the coefficient in front of pentane (C5H12) is 1, indicating that 1 mole of pentane is combusted. On the other hand, the coefficient in front of oxygen (O2) is 8, suggesting that 8 moles of oxygen are needed to react with 1 mole of pentane. Therefore, the mole ratio of oxygen to pentane is 8:1.

In simpler terms, for every 1 mole of pentane that undergoes combustion, you would need 8 moles of oxygen to fully react with it and form the products mentioned in the equation. This mole ratio of 8:1 indicates the stoichiometry of the reaction, allowing us to determine the relative amounts of reactants and products involved.

The mole ratio is an essential concept in stoichiometry, helping us understand the quantitative relationships between different substances in a chemical reaction. It allows us to calculate the amounts of reactants needed or products formed based on the balanced equation. In this case, the mole ratio of 8:1 tells us that a larger quantity of oxygen is required compared to pentane for complete combustion to occur.

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The question asks for the calculation of the reaction rate of the chemical reaction of methyl chloride (CH3Cl) given the initial concentration of 0.0386 mol/L and the time of 15 seconds to complete the reaction. The reaction involves the formation of CH3Cl from CH3OH and HCl. Using the stoichiometry of the reaction and the concentration change of CH3OH over time, the reaction rate is calculated as -Δ[CH3OH]/Δt, which represents the rate of decrease in the concentration of CH3OH. The result is a rate of 0.0386 mol/L.s and a final concentration of CH3Cl of -0.5404 mol/L, which suggests that the reaction may not be feasible under the given conditions due to the lack of reactants and the formation of other products.

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Answer:

The second company job of $18 /hr is the better deal

Explanation:

We are told that;

-First job offers a salary of $30,000/yr

-Second job offers a salary of $18/hr.

Now, let's convert the salary of the second job to amount per year.

We are told that full-time work is 49hr/wk, 52 wk/yr.

Since we have 49 hrs in a week, then amount per week = 18 × 49 = $882 per week

Then amount per year = 882 × 52 = $45864 /yr

Thus, the second job pays $45864 /yr.

This is more than the first job. Thus, the second job is the better deal

Answer:

0.57

Sig Figs

2

Decimals

2

Scientific Notation

5.7 × 10-1

Words

zero point five seven

Explanation:

Answer:

2

Explanation:

Answer:

B is the correct answer

1.6 moles of reactant will be in excess .

What is reactant?
A reagent, also known as an analytical reagent, is a substance as well as compound that is added to a system in order to trigger a chemical reaction or determine whether one has already occurred. Although the words "reagent" and "reactant" are frequently used interchangeably, "reactant" refers to a substance that is consumed during a chemical reaction. Even though they are part of the reaction's mechanism, solvents aren't typically referred to as reactants. Catalysts aren't reactants either because they aren't used up in the reaction. Reactants are frequently referred to as substrates in biochemistry, particularly in relation to enzyme-catalyzed reactions.

By using stoichiometric ratio
5 moles of o2 required to react with 4 moles of nh3
1 moles of o2 required = 4/5 moles of nh3

Here,
When we have 3 moles of o2
then 3 moles of o2 required =  4/5 x 3
                                              = 12/5 moles
                                              = 2.4 moles
then excess of moles of nh3 will be 4 - 2.4 = 1.6.

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Answer:

133.333333333 cm^3

Explanation:

Volume = Mass/Density

The formula of calcium nitrate is Ca(NO3)2, indicating that there are two nitrate ions (NO3-) per calcium nitrate molecule.

To determine the number of moles of nitrate ions in 1.25 mol of calcium nitrate, we need to consider the stoichiometry of the compound.

From the formula Ca(NO3)2, we see that for every 1 mole of calcium nitrate, there are 2 moles of nitrate ions.

Therefore, in 1.25 mol of calcium nitrate, there would be:

2 moles of nitrate ions/mol of calcium nitrate × 1.25 mol of calcium nitrate = 2.50 moles of nitrate ions.

So, there are 2.50 moles of nitrate ions (NO3-) in 1.25 mol of calcium nitrate.

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Answer:

Boron

Explanation:

Hope it helps you......

Answer:

B. Nitrogen

&

D . Boron

Explanation:

both are the element has the largest first ionization energy

Answer: Hewo, there! your answer is Below

C. Sweating Would be the correct answer,

Explanation:

it sends signals to your sweat glands to make you sweat and cool you off. When the hypothalamus senses that you're too cold, it sends signals to your muscles that make your shiver and create warmth. This is called maintaining homeostasis.

Hope this helps you!!

Have a great day!!

Answer:

Which of the following body responses help maintain homeostasis by decreasing body temperature is? I want to say Sweating

Explanation:

But read this before answering to make sure. See what you think. This is what I found

The compounds ranked by their expected lattice energy from greatest to least are: MgF_2, MgCl_2, MgBr_2, MgI_2.

Lattice energy is a measure of the energy released when gaseous ions come together to form an ionic solid. It is influenced by factors such as ion charge and ion size. In general, as the charges of the ions increase, the lattice energy also increases. However, when comparing ions with the same charge, the size of the ions becomes the determining factor.

In the given compounds, the common ion is Mg_2+ (with a +2 charge), while the anions are F-, Cl-, Br-, and I-. Among these anions, fluoride (F-) has the smallest ionic radius, followed by chloride (Cl-), bromide (Br-), and iodide (I-). Smaller ions have a higher charge density, meaning the positive charge is concentrated in a smaller space, leading to stronger attractive forces between the ions.

Therefore, based on ion size, the compound with the greatest expected lattice energy is MgF_2, followed by MgCl_2, MgBr_2, and MgI_2, with MgF_2 having the strongest bond and MgI_2 having the weakest bond.

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The Molarity of volumetric flask 1 : 1.26 M

The Molarity of volumetric flask 2 : 0.06 M

Dilution is a process of decreasing the concentration of a solution by adding a number of solvents

Can be formulated

M₁V₁=M₂V₂

M₁ = Initial Molarity

V₁ = Initial volume

M₂ = Final Molarity (after dilution)

V₂ = Final volume (after dilution)

Volume of volumetric flask = 500 ml

\(\tt M_1.V_1=M_2V_2\\\\9\times 0.07=M_2.0.5\rightarrow M_2=1.26\)

\(\tt M_1.V_1=M_2V_2\\\\1.26\times 0.023=M_2\times 0.5\rightarrow M_2=0.06\)

Answer:

The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

Q= 4.186 \(\frac{J}{g*C}\) *12 g *5 °C

Solving:

Q=251.16 J

Since 1 J is equal to 0.2388 cal, then the following rule of three can be applied: if 1 J is equal to 0.2388 cal, then 251.16 J to how many cal are?

\(cal=\frac{251.16 J * 0.2388 cal}{1 J}\)

cal= 59.98 ≅ 60

The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.

The calorimeter measures the transferred heat of the system. 60 cal is heat is required to raise the temperature of water from 16 to 21 degrees celsius.

Heat is the product of the mass, specific heat, and the change in the temperature of the system.

Heat exchanged by the system is calculated as:

\(\rm Q = \rm m c \Delta T\)

Where,

Mass (m) = 12 g

Specific heat (c) = 4.186

Change in temperature = 5 degrees celsius

Substituting values in the equation:

\(\begin{aligned} \rm Q &= 12 \times 4.186 \times 5\\\\&= 251.16 \;\rm J\end{aligned}\)

Converting joules into cal:

\(251.16 \times 0.2388 \;\rm cal = 60 \;\rm cal\)

Therefore, the heat required is option b) 60 cal.

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Answer:

20

Explanation:

no explanation cos no questions

Answer:

Hahahhaaahhahqhq jajajajq

Explanation:

I have no idea what your question is but it is funny so I will laugh

The correct answer is the letter "a", 20.5 g S. The excess reactant is sulfur, so the mass that exceeds the reaction given is 20.51 grams of sulfur.

The balanced chemical equation for the reaction between sulfur and fluorine to form sulfur hexafluoride is:

To solve this problem, we need to first determine which reactant is limiting and which one is in excess. The limiting reactant is the one that is completely used up in the reaction, while the excess reactant is the one that is left over.

To find the limiting reactant, we need to use stoichiometry to calculate the amount of product that can be formed from each reactant. We can do this by using the molar mass of each reactant and the balanced chemical equation.

Using the balanced chemical equation, we can see that 1 mol of S reacts with 3 mol of F₂ to produce 1 mol of  SF₆. Therefore, the maximum amount of  SF₆ that can be produced from the given amounts of S and F₂ is:

Since the reaction requires 3 moles of F₂ for every mole of S, we can see that there is not enough F₂ to react with all of the S. Therefore, F₂ is the limiting reactant and S is the excess reactant.

To calculate the mass of excess reactant left over, we need to first determine how much of the excess reactant reacted. Since all of the F₂ reacted, we can use the balanced chemical equation to calculate how much S reacted:

The amount of excess S left over is therefore:

Finally, we can calculate the mass of excess S left over:

Therefore, 20.51 g of S is the mass of excess reactant left over and the correct answer is letter A) 20.5 g S

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Answer:

The name of that molecule should be 1-pentyne

so your answr should be B

Explanation:

Molecules are species made up of atoms. The given molecule in the figure is 1-pentyne. Thus, option B is correct.

1-Pentyne is a chemical compound with the formula C₅H₈, and an internal alkyne group between the first and the second carbon atom.

The molecules consist of twelve bonds including the bonds between the carbon-carbon, and carbon-hydrogen. There is one triple or the alkyne bond present and five carbon hence the name of the molecule is 1-Pentyne.

Therefore, the molecule is option b. 1-Pentyne.

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Answer: The elements with properties intermediate between those of metals and nonmetals are called semimetals (or metalloids).

Answer:

B

CuO

H2

Explanation:

hydrogen will oxidized to form water

Copper(II) oxide reacts with hydrogen.

\(CuO + H_2\) → \(Cu + H_2O\)

Oxidising agent - \(Cuo\)

Reducing agent - \(H_2\)

A chemical reaction that takes place between an oxidizing substance and a reducing substance.

The oxidizing substance loses electrons in the reaction, and the reducing substance gains electrons.

In the reaction  \(CuO + H_2\) → \(Cu + H_2O\)  

\(Cuo\) is the oxidising agent and  \(H_2\) is the reducing agent because \(Cuo\)  is oxidising  \(H_2\) and \(H_2\) is the reducing agent because it is removing oxygen from \(Cuo\).

Hence, option B is correct.

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Answer:

All of the consumers and producers eventually become nourishment for the decomposers.

Explanation:

Energy is transferred between organisms in food webs from producers to consumers. The energy is used by organisms to carry out complex tasks. The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants.

Answer:

Spraying perfume in one corner of the room and the smell travels to the other side of the room

Explanation:

Answer:

37.3

263.5

Explanation:

The scale measures hundreds of units, tens of units, units, and parts of units (1 decimal place.

Scale 1

Hundreds 0 * 100 = 0

Tens: 3 * 10 = 30

Units: 7 * 1 = 7

1/10 unit = 3* 0.1 = 0.3

Total 30 + 7 + 0.3 = 37.3

Scale 2

Hundreds 2 * 100 = 200

Tens: 6 * 10 = 60

Units: 3 * 1 = 3

1/10 unit = 5* 0.1 = 0.5

Total = 200 + 60 + 3 + 0.5 = 263.5

The order to accomplish serial processing of updates, many DBMSs use locking. Locking is a technique used in database management systems to prevent conflicts between different transactions that are trying to access or modify the same data.

The transaction is executed, it acquires a lock on the data that it needs to access. This lock prevents any other transactions from modifying the same data until the first transaction has completed. Serial processing of updates is important in situations where multiple users are accessing the same database simultaneously. Without locking, conflicts can arise when two or more users try to modify the same data at the same time. This can lead to inconsistent or incorrect data and can cause serious problems for the users of the system. Locking allows transactions to be processed in a serial manner, ensuring that conflicts are avoided, and data integrity is maintained. It is a common technique used in many DBMSs and is essential for ensuring the reliable and consistent operation of database systems. By using locking, DBMSs can ensure that updates are processed in a controlled and predictable manner, and that data is always accurate and up to date.

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Answer:

D

Explanation: An exothermic change is Because it has heat.

Answer:

A. is the correct point.

Explanation:

This is true because no matter how many mL of water is added, the solution only gets more height; the concentration in everything else stays the same, and water doesn't have any concentration. Very confusing, I know. Good luck!

Answer: The hydroboration of an alkene occurs in TWO CONCERTED STEP which places the boron of the borane on the LESS SUBSTITUTED carbon of the double bond. The oxidizing agent then acts as a nucleophile, attacking the electrophilic BORON and resulting in the placement of a hydroxyl group on the attached carbon. Thus, the major product of the hydroboration oxidation reaction DOES NOT follow Markovnikov's rule.

Explanation:

Hydroboration is defined as the process which allows boron to attain the octet structure. This involves a two steps pathway which leads to the production of alcohol.

--> The first step: this involves the initiation of the addittion of borane to the alkene and this proceeds as a concerted reaction because bond breaking and bond formation occurs at the same time.

--> The second step: this involves the addition of boron which DOES NOT follow Markovnikov's rule( that is, Anti Markovnikov addition of Boron). This is so because the boron adds to the less substituted carbon of the alkene, which then places the hydrogen on the more substituted carbon.

Note: The Markovnikov rule in organic chemistry states that in alkene addition reactions, the electron-rich component of the reagent adds to the carbon atom with fewer hydrogen atoms bonded to it, while the electron-deficient component adds to the carbon atom with more hydrogen atoms bonded to it.

Answer:

Sketch 10 atoms of aluminum and 6 molecules of oxygen gas in the container on the left. In the right container, sketch the contents after the reaction is complete.

Explanation:

The balanced chemical equation of the reaction is:

\(4Al + 3 O_2 -> 2Al_2O_3\)

Though there are 10 atoms of Al, only four atoms will react with every three molecules of oxygen.

Hence, right side the product formed is ---  Al2O3.