Two aircraft rivets, one iron and the other copper, are placed in a calorimeter that has an initial temperature of 20.°C. The data for the rivets are as follows:
Iron Copper
___________________________________
Mass (g) 30.0 20.0
Initial T (°C) 0.0 100.0
c (J/g·K) 0.450 0.387
(b) What other information is needed to correct any measurements in an actual experiment?

The type of radiation in this scenario is Beta and is denoted as option C.

This is a high-speed electron which is emitted when the nucleus undergoes a radioactive decay during the process of beta decay.

In this scenario the electron is denoted as e with a superscript and subscript of 0 and -1 respectively which is the reason for the change from carbon to nitrogen.

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The question is incomplete, the complete question is;

A student investigated some properties of lead and recorded the findings in the table below. Property Observation Color Dull gray Density 11.3 g/cm3 Volume of sample 3 cm3 Melting point 327°C Reaction with air Lead oxide forms on the surface Electrical conductivity Conducts some electricity Which statement is true with respect to the investigation?

A. The student investigated only the physical properties of lead.  

B. The student investigated only the chemical properties of lead.  

C. The student investigated more physical properties than chemical properties of lead.  

D. The student investigated more chemical properties than physical properties of lead.

Answer:

The student investigated more physical properties than chemical properties of lead.

Explanation:

If we look at the things mentioned in the question as regards the approach of the student towards the study of lead, we will discover that he/studied;

Colour, density, volume, melting point and electrical conductivity which are all physical properties. Physical properties of a substance does not involve chemical reactions of the substance under study.

The only chemical property studied by the student is its formation of an oxide- lead oxide with air as follows;

2Pb(s) + O₂(g) → 2PbO(s)

Thus we can safely conclude that; the student investigated more physical properties than chemical properties of lead.

Answer:

c

Explanation:

edge 2021 :)

Answer:

Saffi only

Explanation:

I just took the test and that was the correct answer :)

A solution that contains 7.8% W/V ethanol is equivalent to 0.078g/mL. Details about weights per volume can be found below.

Weights per volume is a unit for measuring density of a substance. It can be converted to g/mL using the following expression:

w/v% = g/100mL

According to this question, a solution contains 7.8% W/V ethanol. The equivalent of this in g/mL is as follows:

7.8% W/V = 7.8g/100mL

= 0.078g/mL

Therefore, a solution that contains 7.8% W/V ethanol is equivalent to 0.078g/mL.

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Answer:

a. The reactivity series is:

increasing reactivity:

(c) sodium

calcium

magnesium

aluminium

zinc

iron

hydrogen

copper

Carbon fits into the series between iron and hydrogen.

b. The method of extraction used to obtain calcium from its ore is electrolysis. This is because calcium is too reactive to be extracted by reduction with carbon.

c. The balanced equation for the extraction of zinc in the blast furnace is:

ZnO + C → Zn + CO

I hope this helps!

The molarity of the base used in the experiment, which was determined based on the recovered NaCl and the volumes of hydrochloric acid and sodium hydroxide, was approximately 1.15 M.

To determine the molarity of the base used in the experiment, we need to use the stoichiometry of the balanced chemical equation and the given data.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:

HCl + NaOH → NaCl + H2O

First, we need to find the number of moles of NaCl produced. We can do this by using the given mass of NaCl (2.22 g) and its molar mass (58.44 g/mol):

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = 2.22 g / 58.44 g/mol

moles of NaCl = 0.038 moles

Next, we can use the stoichiometry of the balanced equation to determine the number of moles of NaOH that reacted. Since the mole ratio between NaCl and NaOH is 1:1, the number of moles of NaOH is also 0.038 moles.

Now, we can calculate the molarity of the base (sodium hydroxide) using the given volume of sodium hydroxide solution (0.033 L):

Molarity of NaOH = moles of NaOH / volume of NaOH solution

Molarity of NaOH = 0.038 moles / 0.033 L

Molarity of NaOH ≈ 1.15 M

Therefore, the molarity of the base used in the experiment is approximately 1.15 M.

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(A) The (H3O+) of a .14 molar solution of HOCL is 1.20 x 10^-5 M.

(B) The net ionic equation for the reaction of NaOCl with water is: NaOCl + H2O → HOCl + Na+ + OH-. The equilibrium constant for this reaction can be calculated using the acid dissociation constant (Ka) for HOCl and the autoionization constant (Kw) for water: Keq = (Ka/[OH-]) = 2.9 x 10^7.

(C) The pH of the solution made by combining 40.0 milliliters of .14-molar HOCl and 5.0 milliliters of .56-molar NaOH is 8.74.

(D) 8.16 grams of solid NaOCl must be added to 50.0 milliliters of .20-molar HOCl to obtain a buffer solution that has a pH of 7.49.

(A) The first step is to set up the equation for the dissociation of HOCl:

HOCl + H2O ⇌ H3O+ + OCl-

The acid dissociation constant (Ka) is given as 3.2 x 10^-8.

Using the equation for Ka, we can solve for [H3O+]:

Ka = [H3O+][OCl-]/[HOCl]

[H3O+] = √(Ka x [HOCl]) = 1.20 x 10^-5 M.

(B) The balanced net ionic equation for the reaction of NaOCl with water is: NaOCl + H2O → HOCl + Na+ + OH-. The equilibrium constant expression can be written as:

Keq = [HOCl][Na+][OH-]/[NaOCl][H2O]

Since water is in excess, we can assume that its concentration is constant and can be omitted from the equation. Also, assuming complete dissociation of NaOCl, we can write [Na+] = [OCl-]. Thus,

Keq = [HOCl][OH-]/[NaOCl]

Using the acid dissociation constant (Ka) for HOCl, we can write [HOCl][OH-] = Ka x [OCl-].

Substituting this in the Keq expression, we get:

Keq = (Ka/[OH-]) = 2.9 x 10^7.

(C) The balanced equation for the reaction of HOCl with NaOH is:

HOCl + NaOH → NaOCl + H2O

This is a neutralization reaction between an acid and a base.

First, we calculate the moles of HOCl and NaOH used:

Moles of HOCl = 0.14 M x 0.040 L = 0.0056 mol

Moles of NaOH = 0.56 M x 0.0050 L = 0.0028 mol

The limiting reagent is NaOH, which reacts completely with the available HOCl.

The moles of HOCl that remain unreacted = 0.0056 - 0.0028 = 0.0028 mol

The concentration of the remaining HOCl in the final solution = 0.0028 mol/0.045 L = 0.0622 M.

Using the equation for Ka and [H3O+] = √(Ka x [HOCl]), we can calculate the pH of the final solution as 8.74.

(D)The pH of the solution made by combining 40.0 milliliters of .14-molar HOCl and 5.0 milliliters of .56-molar NaOH is 8.74.

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Answer:

(1) conversion of mass to energy

Explanation:

Nuclear fission: In nuclear fission, an unstable atom splits into two or more smaller pieces that are more stable, and releases energy in the process. The fission process also releases extra neutrons, which can then split additional atoms, resulting in a chain reaction that releases a lot of energy.

The primary result of a nuclear fission reaction is the conversion of energy to mass.

Hence, option 2 is the answer.

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Answer:

This is literally just the definition of a machine

Answer: this might have something to do with the pancreas

Explanation:

the pancreas produces insulin if subject a produces more insulin than subject b the reaction to the glucose will be different the pancreas breaks down the glucose into sugar and protiens hope this helps

n this questions certain

a

r

e

g

i

v

e

n

,

of moles ,n = 21 mol, Pressure P = 78 atm, Temperature T = 900 K, Volume V = ?

We have to calculate the volume of the given moles of gas at specific temperature and pressure.

Using Ideal Gas equation;

PV = nRT

V = nRT /P ( R = gas constant = 0.08206 L atm

m

o

l

−

1

K

−

1

)

V= 21 mol x 0.08206 L atm

m

o

l

−

1

K

−

1

x 900K / 78 atm

V= 73.854 L atm / 78 atm = 0.946 L

The density of the solid is 5 g/cm³.  Archimedes' principle is a principle of physics that states that the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid that the object displaces.

This principle is based on the fact that buoyancy is a result of the fluid exerting an upward force on the object, which is equal to the weight of the fluid that the object displaces.

Archimedes' principle can be used to find the density of a solid by measuring the buoyant force acting on the solid and the volume of the fluid that the solid displaces. The density of the solid is then given by:

density of solid = mass of solid / volume of solid

To use Archimedes' principle to find the density of a solid, you first need to measure the volume of the fluid that the solid displaces. You can do this by filling a container with the fluid and placing the solid in the container. The volume of the fluid that the solid displaces is equal to the volume of the solid.

Next, you need to measure the buoyant force acting on the solid. You can do this by using a scale to measure the weight of the fluid that is displaced by the solid. The buoyant force is equal to the weight of the fluid that the solid displaces.

Finally, you can use the formula:

density of solid = mass of solid / volume of solid

to find the density of the solid.

For example, suppose you have a solid cube with a mass of 50 g and you want to find its density. You fill a container with water and place the cube in the container. The volume of the water that the cube displaces is equal to the volume of the cube. You measure the weight of the water that is displaced by the cube and find that it is 50 g. You also measure the volume of the cube and find that it is 10 cm³.

Using the formula:

density of solid = mass of solid / volume of solid

we can find the density of the cube:

density of solid = 50 g / 10 cm³

density of solid = 5 g/cm³

Therefore, the density of the solid is 5 g/cm³.  

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The  structure of lipids is dominated by hydrophobic regions.

A  Lipids is any of various organic compounds that are soluble in water . They include fats , waxes, oils, hormones and certain components of membrane  and function as energy storage molecules and chemical messangers. Lipids are stored in your body primarily in specialized fat cells called adipocytes which comprises a specialized fatty tissues called adipose tissue.

Lipids are the structure of dominated hydrophobic regions.

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Answer:

78.894g of NaCl

Explanation:

This requires some dimensional analysis:

Using the molar mass of NaCl we get the answer we are looking for.

1.35 Moles of NaOH * \(\frac{58.44g NaCl}{ 1 mole NaCl}\) = 78.894 g of NaCl

Answer:

2. much greater

The statement, that describes the energy released per mole of reactant during nuclear reactions is "much greater."

Nuclear reaction is a sort of reaction in which the structure of an atom's nucleus changes completely, frequently producing a different element while releasing energy.

The energy released by nuclei is far more dense (approximately a million times more dense) than the energy released by atom interactions (chemical reactions). This is what gives nuclear weapons their extraordinarily huge and destructive force when compared to conventional weapons. Nuclear reactions generate more energy than chemical reactions.

Hence the correct option is 2.

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Light is not considered matter. It is a form of electromagnetic radiation that does not possess mass or occupy space in the same way that physical substances do.  Option D

a) Bubbles are made up of matter. They are typically composed of a gas (such as air) surrounded by a liquid or solid material, forming a thin film. The film of the bubble contains molecules of the substance, making it a form of matter.

b) Smoke consists of tiny particles suspended in air, resulting from the incomplete combustion of a material. These particles are solid or liquid, making smoke a form of matter. It contains tiny particles of matter that are dispersed in the air.

c) Glass is a solid material that is made up of an amorphous arrangement of molecules. It is a state of matter known as a solid, characterized by its rigidity and shape. Glass is composed of atoms and molecules tightly packed together.

In contrast, light does not have mass or a fixed volume. It behaves as both particles (photons) and waves, and it travels in a straight line at a constant speed. Light can interact with matter, such as being absorbed, transmitted, or reflected, but it itself is not matter.

In summary, while bubbles, smoke, and glass are all forms of matter, light is not. Light is a type of electromagnetic radiation that exhibits wave-particle duality and does not possess mass or occupy space in the same way as physical substances.

Option D

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The percentage (weight/weight) of the acetic acid in the vinegar sample is 2.09 %.

The density of the vinegar solution = 1.050 g/mL

The molarity of the solution = 0.275 M

The volume of the solution = 1.33 L

The mas of the acetic acid = 22 g

The molar mass of the acetic acid = 60.05 g/mol

The mass of the solute = 0.275 × 1.33 × 60.05

The mass of the solute = 22 g

The mass of the solution = 1.05 × 1000

The mass of the solution = 1050 g

The weight per weight percent :

(w/w) % = 22 g / 1050 g

(w/w) % = 2.09 %.

The (w/w) %  is 2.09 %.

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This question is incomplete, the complete question is :

assuming that the density of the vinegar solution is 1.050 g/ml, calculate the percentage (weight/weight) of acetic acid in the vinegar sample. (It has a 0.275 molarity and there are 1.33 Liters of it, or 22.0 grams of acetic acid in it).

Answer:

maybe something about planets or the solar system and they have to make them

Explanation:

Answer:

create a rainbow of flames or build an infinty mirror

Explanation:

The number of milliliters of HCl required to reach the endpoint is 10.2 mL.

To determine the number of milliliters of HCl required to reach the endpoint, we need to use the concept of stoichiometry and the known concentrations and volumes of the solutions involved. The balanced chemical equation for the reaction between NaOH and HCl is NaOH + HCl → NaCl + H2O. From the equation, we can see that the ratio of NaOH to HCl is 1:1.

First, we calculate the number of moles of NaOH in the solution by multiplying the concentration (0.045 M) by the volume (25.00 mL converted to liters). This gives us the moles of NaOH in the solution.

Next, we use the stoichiometry of the balanced equation to determine the moles of HCl required to react with the NaOH. Since the ratio is 1:1, the moles of HCl needed will be equal to the moles of NaOH.

Finally, we can calculate the volume of the 0.098 M HCl solution needed to reach the endpoint by dividing the moles of HCl by the concentration (0.098 M). The result is the number of milliliters of HCl required, which is 10.2 mL.

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Due to electronegativity difference between H and F atom.

Thus from the above conclusion we can say the difference in electronegativity between H and F atom this is the reason for shorter bond length of HF.

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Josef Loschmidt and Amedeo Avogadro were both scientists who made significant contributions to the understanding of basic molecular numbers, sizes, and reaction ratios.

In 1811, Amedeo Avogadro proposed that equal volumes of gases at the same temperature and pressure contain the same number of molecules. This became known as Avogadro's law, which laid the foundation for the concept of the mole.

Josef Loschmidt, on the other hand, made important contributions to determining the size of molecules. In 1865, Loschmidt used kinetic theory to calculate the number of molecules in one cubic centimeter of gas at standard temperature and pressure (STP). He estimated the number to be about 2.7 x 10¹⁹, which is close to the modern value of Avogadro's number.

The term "Avogadro's number" was not coined until the early 1900s, long after Avogadro's death. The name was proposed by French physicist Jean Baptiste Perrin in honor of Avogadro's contributions to the concept of the mole.

In my opinion, the name "Avogadro's number" is appropriate because Avogadro's law was the first concept to establish a relationship between the volume of a gas and the number of molecules it contains. Moreover, Avogadro's law played a crucial role in the development of the mole concept, which is essential in chemical calculations. While Loschmidt's contributions were also significant, he did not propose a fundamental law like Avogadro did. Therefore, I believe that naming the number after Avogadro is appropriate to recognize his contributions to this fundamental concept in chemistry.

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Hydrogen bonding in water molecules are responsible for the unique properties of water.

Water is a molecule composed of hydrogen and oxygen atoms. Oxygen is highly electronegative. This leads to the introduction of polarity in the O-H bond in water. Hydrogen bonding occurs in a molecule when hydrogen is bonded to highly electronegative atom.

As a result of this polarity and consequent hydrogen bonding due to the hydrogen - oxygen bond, water molecules have several unique properties such as high heat of vaporization, high surface tension and high boiling point.

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Based on the description provided, the element that is most likely to be Sample 1, described as a shiny wire, is a metal.

Metals generally exhibit a characteristic property of high luster or shine due to their ability to reflect light efficiently. Metals have free electrons that are able to move and interact with light, resulting in the shiny appearance.

Nonmetals, on the other hand, do not typically display a shiny or lustrous appearance. They often have dull or matte surfaces. Although some nonmetals can be shiny in certain forms, such as iodine or graphite, the description of a shiny wire suggests a metal element.

Therefore, based on the provided information, Sample 1 is most likely an element from the category of metals.

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The new pressure of the gas is 11.3 atm.

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas. The formula is:

(P₁V₁)/T₁ = (P₂V₂)/T₂

where P₁, V₁, and T₁ are the initial pressure, volume, and temperature, and P₂, V₂, and T₂ are the final pressure, volume, and temperature.

First, we need to convert the initial temperature to kelvin by adding 273.15:

T₁ = 39.8 + 273.15 = 313.95 K

Next, we can plug in the values into the combined gas law to solve for the initial pressure:

(785.1 torr)(3.8 L)/313.95 K = P₂(0.21 L)/1062.55 K

P₂ = (785.1 torr)(3.8 L)(1062.55 K)/(313.95 K)(0.21 L)

P₂ = 8595.5 torr

Finally, we need to convert the pressure from torr to atm by dividing by 760:

P₂ = 8595.5 torr / 760 torr/atm = 11.3 atm

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299.7g of H2O will be produced.

1st) With the balanced chemical equation and the molar mass of CH4 and H2O, we can calculate the amount of H2O that is produced by stoichiometry:

- CH4 molar mass: 16g/mol

- H2O molar mass: 18g/mol

According to the balanced equation, 16g of CH4 will produce 36g of H2O (2 x 18g).

2nd) Now, with a mathematical rule of three we can calculate the grams of water that will be produced from 133.2 grams of CH4:

Finally, 299.7g of H2O will be produced from 133.2 grams of CH4.

an experiment where a Gummy Bear is sacrificed for the sake of science The 2nd part of the experiment involves tossing a Gummy Bear into molten potassium chlorate. As a result, the sucrose reacts with oxygen and generates purple sparks and a lot of heat and The balanced reaction looks like :

C₁₂H₂₂O₁₁ (s) + 8KClO₃ (s) =  12CO₂ (g) + 11H₂O (g) + 8KCl (s)

When the potassium chlorate is heated, it decomposes into potassium chloride and oxide, as seen below:

2KClO₃(s) =  2KCl(s) + 3O₂(g)

When the gummy bear is dropped, the oxide from the decomposition of potassium chlorate reacts with the glucose molecule in sucrose. This reaction is a spontaneous combustion reaction:

C₆H₁₂O₆ (s) + 6O₂(g) = 6CO₂(g) + 6H₂O (g)

The overall reaction is seen below:

C₁₂H₂₂O₁₁ (s) + 8KClO₃ (s) =  12CO₂ (g) + 11H₂O (g) + 8KCl (s)

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The product formed when (CH₃)₂CH-O-CH₂CH₃ is treated with HBr is (CH₃)₂CHBr.

When (CH₃)₂CH-O-CH₂CH₃ is treated with HBr, the ether undergoes an acid-catalyzed cleavage to form two different products. One of the products formed is (CH₃)₂CHBr, which is a tertiary alkyl bromide. This reaction involves the protonation of the ether oxygen by HBr, followed by the nucleophilic attack of the bromide ion on the carbon atom adjacent to the positively charged oxygen.

The resulting intermediate is then deprotonated to form (CH₃)₂CHBr. The other product formed is ethanol (CH₃CH₂OH), which is a byproduct of the reaction. Overall, the reaction results in the conversion of an ether into an alkyl bromide and an alcohol.

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