Classify the following as a physical property (phys) or a chemical property (chem). (a) Silver metal has a shiny luster. (b) Silver metal has a density of 10.49 gtcm3. (c) Silver metal and chlorine gas produce AgCl. (d) Silver metal has a melting point of 1235 "C. (e) Silver metal conducts electricity. (0 Silver metal gives no reaction in acid.

Answer: 4.88 g/mol. and helium

Explanation:

To find the molar mass of the gas, we can use the ideal gas law equation which is PV=nRT where:

P = pressure = 2.000 atm

V = volume = 50.00 L

n = number of moles

R = gas constant = 0.08206 L·atm/K·mol

T = temperature = 273.15 K

First, we need to find the number of moles of the gas:

PV = nRT

n = PV/RT

n = (2.000 atm)(50.00 L)/(0.08206 L·atm/K·mol)(273.15 K)

n = 1.844 mol

Now, we can find the molar mass of the gas by dividing its mass by the number of moles:

molar mass = mass/number of moles

mass = 9.00 g

molar mass = 9.00 g/1.844 mol

molar mass = 4.88 g/mol

Therefore, the molar mass of the gas is 4.88 g/mol.

To determine what gas this is, we can compare the molar mass of the gas to the molar masses of known gases. The molar mass of 4.88 g/mol is closest to that of helium (4.00 g/mol). Therefore, this gas is most likely helium.

Answer:

Thermal

Explanation:

When something heats up its atoms become further apart making it melt when something heats up or gets heat or loses heat that's thermal energy

The volume of concentrated HCl : 2.073 ml

Given

37% HCl by mass; density 1.19 g/mL

Required

The volume of concentrated HCl

Solution

Conversion to molarity :

37% x 1.19 g/ml =0.4403 g/ml

g/ml to mol/L :

=0.4403 g/ml x 1000 ml/L : 36.5 g/mol

=12.06 mol/L

or we can use formula :

\(\tt M=\dfrac{\%\times \rho\times 10}{MM}\\\\M=\dfrac{37\times 1.19\times 10}{36.5}\\\\M=12.06\)

Dilution formula :

M₁V₁=M₂V₂

12.06 M x V₁ = 0.1 M x 0.25 L

V₁ = 0.0021 L = 2.073 ml

The diffusion coefficient (D) of a species can be calculated using the Arrhenius equation: D = D0 * exp(-Q/RT)

Where D0 is the pre-exponential factor, Q is the activation energy, R is the gas constant, and T is the temperature in Kelvin. For the diffusion of hydrogen through BCC iron, the activation energy is typically in the range of 85-105 kJ/mol. Using Q = 100 kJ/mol and T = 298 K (25°C), we can estimate D = \(2.2 * 10^-14 cm^2/s\). For the diffusion of H into Al, we already know D0 =\(0.11 cm^2/s\)and Q = 9780 cal/mol. Converting Q to kJ/mol, we have Q = 40.8 kJ/mol. Using this value and T = 298 K, we can estimate D = \(7.3 * 10^-15 cm^2/s\). Based on these calculations, it is apparent that BCC iron would be better suited as the material for a high-pressure hydrogen storage tank due to its higher diffusion coefficient. The slower diffusion of hydrogen through aluminum would result in a lower rate of hydrogen uptake, making it a less suitable material for hydrogen storage applications.

The complete question is:

Calculate the diffusion coefficients for the diffusion of hydrogen through BCC iron and FCC aluminum at room temperature (25°C). For the diffusion of H into Al, D0 = 0.11 cm2/s and Q = 9780 cal/mol. Based on your calculations, which material would be better suited as the material for a high-pressure hydrogen storage tank?

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The mass (in grams) of lead that will plate out of the solution, given that 3.91 A is passed through the solution for 1.7 h is 25.66 g

First, we shall determine the charge flowing through the solution. This is shown below:

Q = It

Q = 3.91 × 6120

Q = 23929.2 C

Finally, we shall determine the mass of lead that will plate out of the solution. Details below:

Balanced equation

Pb²⁺ + 2e —> Pb

From the balanced equation above,

193000 C plated 207 g of lead

Therefore,

23929.2 C will plate = (23929.2 × 207) / 193000 = 25.66 g of lead

Thus, the mass of lead that  will plate out is 25.66 g

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Answer:

Four substitution products are obtained. The carbocation that forms can react with either nucleophile (H2O or CH3OH) from either the top or bottom side of the molecule

Explanation:

An SN1 reaction usually involves the formation of a carbocation in the slow rate determining step. This carbocation is now attacked by a nucleophile in a subsequent fast step to give the desired product.

However, the product is obtained as a racemic mixture because the nucleophile may attack from the top or bottom of the carbocation hence both attacks are equally probable.

The attacking nucleophile in this case may be water or CH3OH

Container 3 has the gas stored at the highest temperature.

Temperature is a measure of the average kinetic energy of the particles in a substance. In the given table, it is stated that container 3 has a large number of collisions with container walls, high average kinetic energy, and large number of particles with large spaces between them.

These properties indicate that the gas in container 3 has higher kinetic energy and more vigorous movement compared to the other containers.

Container 1 has a low number of collisions with container walls and a medium average kinetic energy. This suggests that the gas in container 1 has lower energy and less movement than the gas in container 3.

Container 2 has a large number of collisions with container walls, but it also has a small number of particles with little spaces between them. While the collisions may be frequent, the limited number of particles and the lack of space between them may result in lower overall kinetic energy compared to container 3.

Container 4 has few collisions with container walls, low average kinetic energy, and a small number of particles. These properties indicate that the gas in container 4 has the lowest energy and least movement among all the containers.

Container 3

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Answer:

A. It explains how nature works.

Explanation:

A scientific theory is an explanation, based on a body of evidence, of how something works or will behave.

The other three answers contradict scientific theory. Theories should be based on many experiments, and you should be able to replicate the results and observations.  

Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

Answer:

Yes

Explanation:

The unit is repeated in the same arrangement over and over throughout the entire pure substance. These extended structures are different from molecules and can be compounds or elements. For example, table salt has an extended structure that is made up of two types of atoms, sodium and chlorine.

One-point perspective is a type of linear perspective where all lines converge to a single vanishing point on the horizon line. This technique is particularly suitable when depicting interior spaces or scenes viewed from a single vantage point.

For Jean to accurately depict the height of objects in the room, she should utilize a one-point perspective drawing. One-point perspective is a type of linear perspective where all lines converge to a single vanishing point on the horizon line. This technique is particularly suitable when depicting interior spaces or scenes viewed from a single vantage point.

By placing the vanishing point on the horizon line, Jean can establish a point of convergence for all vertical lines in the room. The height of objects, such as furniture, walls, or doors, can be represented accurately by drawing vertical lines from their base to the vanishing point. This approach creates a sense of depth and proportion, allowing viewers to perceive the relative heights of objects within the room.

Using one-point perspective will help Jean create a clear and realistic representation of the room's spatial arrangement, enabling her to accurately communicate the height relationships between different objects present in the crime scene.

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Answer:

ExplaIf the organism was transported to a new ecosystem in the USA, this species will be an invasive species, which will reproduce more, and will not have a specific predator, which may bring an imbalance to the ecosystem.

What are Invasive Species?

Invasive Exotic Species or, simply, Invasive Species is defined as an exotic species that proliferates without control and starts to pose a threat to native species and to the balance of ecosystems that it occupies and transforms in its favor. It can even pose a risk to people.

With this information, we can conclude that caution is needed when introducing a new species into a new ecosystem.

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To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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HAZWOPER training and certification recognize:

The correct option is both A and C

HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.

Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.

This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.

Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.

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Consider the following mechanism.

The overall balanced chemical equation : 2O₃  ---->   3O₂

The intermediates within the mechanism : O

The order with respect to each reactant :  2

The rate law for the overall reaction : R = k[O₃]²/[O]

The equations are :

O₃  ---->   O₂  +  O   fast

O₃  +   O  --->  2O₃   slow

a) The overall reaction is given as :

2O₃  ---->   3O₂

b) The intermediates within the mechanism is O.

c)  The order with respect to each reactant is 2

d) slow step rate : k[O][O₃]

at equilibrium, kc = [O][O₂] / [O₃]

The rate law = R = k[O₃]²/[O]

Thus, Consider the following mechanism.

The overall balanced chemical equation : 2O₃  ---->   3O₂

The intermediates within the mechanism : O

The order with respect to each reactant :  2

The rate law expression for the reaction : R = k[O₃]²/[O]

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Answer:

Calculate the mass in grams.

Answer: Calculate the mass in grams of calcium bromide the chemist has added to the flask. Round your answer to 3 significant digits.

Explanation:

6.4875 moles of nitrogen gas would be produced if 8.65 moles of copper(II) oxide were reacted with excess ammonia.

Given the following balanced equation, 2 NH₃(g) + 3 CuO (s) → 3 Cu(s) + N₂(g) + 3 H₂O(g). We are required to determine the number of moles of nitrogen gas that would be produced if 8.65 moles of copper(II) oxide were reacted with excess ammonia. We can use stoichiometry to solve this problem. Stoichiometry is the quantitative relationship between the reactants and products in a chemical reaction. It allows us to make predictions about the amount of product produced or reactant required in a chemical reaction. Stoichiometry relies on the balanced chemical equation for the reaction. In this case, the balanced chemical equation is 2 NH₃(g) + 3 CuO (s) → 3 Cu(s) + N₂(g) + 3 H₂O(g).

The balanced chemical equation shows that 2 moles of ammonia react with 3 moles of copper(II) oxide to produce 1 mole of nitrogen gas and 3 moles of water. This means that the mole ratio of ammonia to nitrogen gas is 2:1. We can use this mole ratio to determine the number of moles of nitrogen gas produced in the reaction. We know that 8.65 moles of copper(II) oxide is reacted with excess ammonia. Since copper(II) oxide is the limiting reagent, we can use it to calculate the number of moles of ammonia used in the reaction. The molar ratio of copper(II) oxide to ammonia is 3:2. Therefore, we can calculate the number of moles of ammonia used in the reaction as follows:Number of moles of ammonia = (3/2) × number of moles of copper(II) oxideNumber of moles of ammonia = (3/2) × 8.65Number of moles of ammonia = 12.975 molesWe know that the mole ratio of ammonia to nitrogen gas is 2:1. Therefore, the number of moles of nitrogen gas produced in the reaction is half the number of moles of ammonia used.Number of moles of nitrogen gas produced = (1/2) × number of moles of ammoniaNumber of moles of nitrogen gas produced = (1/2) × 12.975Number of moles of nitrogen gas produced = 6.4875 moles.

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Answer:

E.

Explanation:

Look at change in concentration over time...is it increasing or decreasing? It is increasing right as you can see because it starts at 0 then increases and plataeus. What increases in a reaction, reactant or product? Products increase right cuz your reactants react with each other to make prodcuts.

At start of reaction you have no products (zero) thus this graph starts at 0. At end you have alot of product thus over time the concentration of product increases.

ABC are reactants their concentration should decrease over time

DE are products, they should increase as reaction goes on.

Answer:

If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas

(02) and 3.4 moles of carbon monoxide (CO) entered the reaction

Explanation:

The rule of three or is a way of solving problems of proportionality between three known

values and an unknown value, establishing a relationship of proportionality between all of

them. That is, what is intended with it is to find the fourth term of a proportion knowing the

other three. Remember that proportionality is a constant relationship or ratio between different

magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so

does the other (or when one magnitude decreases, so does the other), the direct rule of three

must be applied. To solve a direct rule of three, the following formula must be followed:

ab

cx

So

C*b

T =

a

In this case, it is possible to use the reaction stoichiometry of the reaction (that is, the

relationship between the amount of reagents and products in a chemical reaction) and the rule

of three to calculate the quantities of moles requested:

.

,

If by stoichiometry 2 moles of CO2 are formed by 1 mol of O2, if 3.4 moles of CO2 are

formed, how many moles of O2 are needed?

molesofo2 = 3.42

=

moles of O2=1.7 moles

• If by stoichiometry 2 moles of CO2 are formed by 2 moles of CO, if 3.4 moles of CO2 are

formed, how many moles of CO are needed?

molesof CO =

=

3.4*2

2

moles of CO=3.4

Answer:

Your answer is B, Electrochemistry!

Explanation:

This is the part of chemistry that studies the chemical process in which electrons flow. This flow is called electricity. Electricity is generated by the flow of electrons, from one element to another element. This reaction is called oxidation reduction.

Answer: B

Explanation:

Chemical processes referred to as endothermic reactions occur when the reactants take in heat energy from their environment to create products.

Endothermic reactions quickly and efficiently take up heat-based energy from their surroundings. In contrast, an exothermic process transfers energy into the system's surroundings. A common illustration of an endothermic chemical reaction is photosynthesis.

Chemists refer to the process of boiling water as being endothermic since heat must be added. It follows that since certain processes need heat, others must also produce heat as they operate. They are referred to as exothermic.

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Answer:

Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).

Explanation:

The heat energy given off when liquid mercury at 28.9 °C is converted to solid mercury at its melting point is 284.2 J.

The heat energy given off when liquid mercury at 28.9 °C is converted to solid mercury at its melting point is determined as follows:

Moles of Mercury:

14.0 g Hg x 1 mol Hg/201 g = 0.0697 moles

Heat released:

q = heat = m x C x ∆T

25ºC = 298.15K

25ºC = 298.15K

∆T = 234.32  K- 298.15 K

∆T = 63.83 K

q = (0.0697 mol)(28.0 J/molK)(63.83K) = 124.6 J

The heat released from liquid to solid:

q = m x ∆H fusion = (0.0697 mol)(2.29 kJ/mol)

q = 0.1596 kJ

q  = 159.6 J

The total heat energy is given off:

Qtotal = 124.6 J + 159.6 J

Qtotal = 284.2 J

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Complete question:

Calculate the heat energy released when 14.0 g of liquid mercury at 28.9 °C  °C is converted to solid mercury at its melting point.

Answer:

Energy released =  18.985 J

Explanation:

The  exponential decay of radioactive substance is given by -

N(t) = N₀ \(e^{-kt}\)

where

N₀ = initial quantity

k = decay constant

Half life, \(t_{1/2} = \frac{ln 2}{k}\)

⇒\(k = \frac{ln 2}{t_{1/2} }\)

Given,

N₀ = 12.5 + 3 = 15.5 × 10⁻⁶ gm

\(t_{1/2}\) = 32.6 + 18 = 50.6 × 10⁶ years

So,

\(k = \frac{ln 2}{50.6 * 10^{6} }\) = 1.361 × 10⁻⁸ year⁻¹

Now,

N(1) = 15.5 × 10⁻⁶  \(e^{-1.361*10^{-8} *1}\)

      = 15.49999978904

Now,

Substance decayed = N₀ - N(t)

                                 = 15.5 × 10⁻⁶ - 15.49999978904 × 10⁻⁶

                                 = 21.095 × 10⁻¹⁷ kg

⇒Δm = 21.095 × 10⁻¹⁷ kg

So,

Energy released = Δmc²

                           = 21.095 × 10⁻¹⁷ × 3 ×10⁸ × 3 × 10⁸

                          = 189.855 ×10⁻¹

                          = 18.985 J

⇒Energy released =  18.985 J

Converting the units of a measurement is an essential skill that everyone should have. In our daily life, there are numerous situations where we might need to convert the units of measurement. One of the common examples can be when baking. To get the desired outcome, it is crucial to have the right amount of ingredients.

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Answer:

Explanation:

The preceding chapter introduced the use of element symbols to represent individual atoms. When atoms gain or lose electrons to yield ions, or combine with other atoms to form molecules, their symbols are modified or combined to generate chemical formulas that appropriately represent these species. Extending this symbolism to represent both the identities and the relative quantities of substances undergoing a chemical (or physical) change involves writing and balancing a chemical equation. Consider as an example the reaction between one methane molecule (CH4) and two diatomic oxygen molecules (O2) to produce one carbon dioxide molecule (CO2) and two water molecules (H2O). The chemical equation representing this process is provided in the upper half of Figure 1, with space-filling molecular models shown in the lower half of the figure.

The amount of energy that is required to change 20.0 g of an unknown substance from -15.0 °C to 7.0 °C is q = +49.65 kJ.

Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.

At -15°c, it will be solid, to increase the amount of heat to raise

temp from -15°C to 40°C.

(20.0) (3.3J/g°c) x 15°C) = 330 J.

At -10°C, it is in which phase transformation takes place from sold to wound.

ΔHfue = 0.945 J/gx 20g = 18.93.

After that, it will be in want and it will be in liquid form 40°C.

To 7°C, then.

922 m Cgas 47

=(20g) (1455/g°c) (17)

493005.

Total Energy = q1 + ΔHfus  + q2

47 = 7.0°C - 10°C) = 14°C -

2 330J18.95 + 49300J

q = 49648.9 3. 9

q = +49.65 KJ

Therefore, the amount of energy is q = +49.65 KJ.

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A descriptive model of Earth's layers can be categorized as prototype model. Hence, option B is correct.

What is a descriptive model?

A descriptive model describes a system or other entity and its relationship to its environment.

The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.

The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle.

Hence, option B is correct.

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Answer:

C im pretty sure

Explanation:

Because it is facing the opposite direction with opposite colors.