PLEAS HURRY IM TIMED If something moves around and takes the shape of the container it is in, it is most likely a
gas
liquid
Solid

Answer:

\(f=7.09 s^{-1}=7.09 Hz\)

Explanation:

Hello.

In this case, since the frequency of the mechanical way is computed considering its velocity and wavelength in SI units:

\(f=\frac{\lambda }{v}\)

We can compute it for a 12.02-m wavelength and 1.70-m/s velocity as shown below:

\(f=\frac{12.05m}{1.70m/s}\\ \\f=7.09 s^{-1}=7.09 Hz\)

Which measured in s⁻¹ or Hz.

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The First step is to write and balance our reaction:

Mg + Br2 → MgBr2

As we can see Mg and Br2 have a charge equal to zero. Therefore, on the right side, we must have a zero electrical charge too.

--------------

The second step is to analyze what happens to each of them when the reaction occurs.

Mg) On the left, its oxidation state is 0, then in MgBr2, Mg has a +2 charge. So, we can say that if the atom goes from 0 to +2, it loses electrons (loses negative charges or gain positive charge). We can also say that Mg oxidized.

Until here, the atom that loses electrons gets oxidized.

Br)On the left, Br starts with 0, then in MgBr2, it has -1. So we can say that Br gained electrons (gain negative charge). We can also say that Br is reduced.

-------------

The 3rd step is to find the right statement.

Answer: The magnesium atom is losing electrons; therefore, it is oxidized.

Answer:

417 °C

Explanation:

From the question given above, the following data were obtained:

Mass of iron (Mᵢ) = 645 g

Specific heat capacity of iron (Cᵢ) = 0.449 J/gºC

Mass of water (Mᵥᵥ) = 375 g

Initial temperature of water (Tᵥᵥ) = 26 °C

Equilibrium temperature (Tₑ) = 87 °C

Specific heat capacity of water (Cᵥᵥ) = 4.184 J/gºC

Initial temperature of iron (Tᵢ) =?

The initial temperature of iron can be obtained as follow:

Heat lost by iron = heat gain by water

MᵢCᵢ(Tᵢ – Tₑ) = MᵥᵥCᵥᵥ(Tₑ – Tᵥᵥ)

645 × 0.449(Tᵢ – 87) = 375 × 4.184 (87 –26)

289.605(Tᵢ – 87) = 1569 × 61

289.605Tᵢ – 25195.635 = 95709

Collect like terms

289.605Tᵢ = 95709 + 25195.635

289.605Tᵢ = 120904.635

Divide both side by 289.605

Tᵢ = 120904.635 / 289.605

Tᵢ ≈ 417 °C

Thus, the original temperature of the iron is 417 °C

The enthalpy of the reaction when 0.384 g of sodium metal is added to an excess of hydrochloric acid and 3990 J of heat is produced is 266 KJ.

The balanced chemical equation of reaction is -

2 Na(s) + 2 HCl(aq)  ⟶  2 NaCl(aq) + H₂(g)

We know that,

weight of sodium metal is 0.384 g

Molar mass of Na is 23 g/mol

we will calculate the number of moles,

Number of moles = Given mass

                                 Molar mass

Moles of Na =  0.348 g   = 0.015 mol

                        23 g/mol

We will calculate the energy in 1 mole of sodium metal

In 0.015 moles of sodium metal, 3990 J of energy is produced.

so, in 1 mole of sodium metal, 3990 J of energy is produced

                                                  0.015

In 1 mole, 266000 J of energy is produced.

1 J = 0.001 KJ

266000 J = 266 KJ

The enthalpy of the reaction will be 266 KJ.

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Answer:

The Sun and the planets were born from a cloud of gas and dust called the solar nebula 4.6 billion years ago. The collapse of the solar nebula was most likely triggered by a shock wave from a nearby supernova explosion. The Sun formed in the center, with the planets surrounding it in a thin disk.

Explanation:

Answer:

the answer is inner core

Explanation:

The inner core is solid, the outer core is liquid, and the mantle is solid/plastic. This is due to the relative melting points of the different layers (nickel–iron core, silicate crust and mantle) and the increase in temperature and pressure as depth increases

We want to transform the measure: 0.680 L/min to microliters per hour.

We will find that the equivalent measure is 40,800,000 μL/h

To do it, we first need to remember that:

1 L = 1*10^6 μL

1 hour = 60 min

Then we can rewrite these as:

1 = (60min/1 h)

1 = ( 1*10^6 μL/ 1L)

Remember that if we multiply any quantity by one we do not change that quantity, then to change the units we just need to multiply our measure by the above fractions:

M = 0.680 L/min*( 1*10^6 μL/ 1L)*(60min/1 h) = 40,800,000 μL/h

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Answer:

Need to find moles NaCl.

526 grams NaCl (1 mole NaCl/58.44 grams)

= 9.0 moles NaCl

----------------------------------------------------

now,

Molarity = moles of solute/Liters of solution

or, for our purposes

Liters of solution = moles of solute/Molarity

Liters of solution = 9.0 moles NaCl/3.0 M

= 3.0 liters in volume

The hydrogen-rich fuel cell offers advantages in terms of efficiency, environmental impact, operating time, refueling speed, weight, size, and lifespan when compared to conventional electrochemical cells like the lead-acid battery.

The hydrogen-rich fuel cell offers several advantages over conventional electrochemical cells like the lead-acid battery. Here are some of the key advantages:

1. Higher Efficiency: Hydrogen fuel cells have higher energy conversion efficiencies compared to lead-acid batteries. Fuel cells can convert chemical energy directly into electrical energy with minimal loss, while lead-acid batteries have inherent energy losses due to factors such as internal resistance and heat dissipation.

2. Clean and Environmentally Friendly: Hydrogen fuel cells produce electricity through the reaction of hydrogen and oxygen, with water being the only byproduct. They do not produce harmful emissions or contribute to air pollution, making them a cleaner and more sustainable power source compared to lead-acid batteries, which require the use of chemicals like sulfuric acid.

3. Longer Operating Time: Fuel cells have longer operating times compared to lead-acid batteries. Lead-acid batteries have a limited capacity and need to be recharged frequently, while fuel cells can continuously generate electricity as long as there is a supply of hydrogen.

4. Faster Refueling: Refueling a fuel cell is faster compared to recharging a lead-acid battery. Fuel cells can be refueled by replenishing the hydrogen supply, which can be done relatively quickly. In contrast, lead-acid batteries require a longer time to recharge, typically hours, depending on the battery's capacity and charging rate.

5. Lighter Weight and Compact Size: Hydrogen fuel cells have a higher energy density compared to lead-acid batteries, meaning they can store more energy in a smaller and lighter package. This makes fuel cells more suitable for applications where weight and space are critical, such as in portable devices or electric vehicles.

6. Longer Lifespan: Fuel cells generally have a longer lifespan compared to lead-acid batteries. Lead-acid batteries can experience degradation over time due to factors like sulfation, which can reduce their overall capacity and lifespan. Fuel cells, on the other hand, can provide consistent performance over an extended period with proper maintenance.

These advantages make fuel cells a promising technology for various applications, including transportation, stationary power generation, and portable electronics.

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Calcium sulfate (CaSO4) is a chemical compound made from calcium, oxygen, and sulfur.

The major sources of calcium sulfate naturally happen are gypsum and anhydrite, which occur at many position worldwide as evaporites.

A simple procedure for preparing acicular calcium sulfate dihydrate is on condition that in which a slurry of calcium carbonate carrying 100 to 800 grams per lite of calcium carbonate is assorted with a solution of sulphuric acid carrying 80 to 500 grams per liter sulphuric acid in proportions that construct calcium sulfate.

So we can conclude that Calcium sulfate, CaSO4, is a natural happen calcium salt.

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Answer:

To find the molarity of H2C2O4 (oxalic acid), we need to know the number of moles of H2C2O4 and the volume of the solution in liters.

Let's assume we have 10 grams of H2C2O4 and we dissolve it in enough water to make 1 liter of solution.

The molar mass of H2C2O4 can be calculated by adding the molar masses of the individual atoms:

molar mass of H2C2O4 = 2(1.01) + 2(12.01) + 4(16.00) = 90.04 g/mol

To calculate the number of moles of H2C2O4 in the solution, we divide the mass of H2C2O4 by the molar mass:

moles of H2C2O4 = mass of H2C2O4 / molar mass

moles of H2C2O4 = 10 / 90.04

moles of H2C2O4 = 0.111 mol

Therefore, we have 0.111 moles of H2C2O4 in 1 liter of solution.

The molarity of the solution is defined as the number of moles of solute per liter of solution:

Molarity = moles of solute / volume of solution (in liters)

Molarity = 0.111 mol / 1 L

Molarity = 0.111 M

Therefore, the molarity of the H2C2O4 solution is 0.111 M.

Explanation:

The mole ratio of the CO2 to LiOH is 1:2

The mole ratio is 1:2.

If 1 mole of CO2 reacts with 2 moles of LiOH

x moles of CO2 will react with 12.5 moles of LiOH

x = 6.25 moles

If 2 moles of LiOH produces 1 mole of water

12.5 moles of LiOH will produce 12.5 * 1/2

= 6.25 moles of water

Mole ratio of water to calcium carbide is 2:1

Number of moles of CaC2 = 27 g/64 g/mol

= 0.42 moles

1 mole of CaC2 reacts with 2 moles of H2O

0.42 moles of CaC2 reacts with 0.42 * 2/1

= 0.84 moles

If 1 mole of CaC2 lead to the formation of 1 mole of C2H2

Then 0.42 moles of C2H2 is formed

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Potential energy is often referred to as the energy of position or composition. The energy that an object has due to its tension, electric charge, or relative immobility in space is known as potential energy. Potential energy is among the two basic forms of energy.

William Rankine, a Scottish engineer and physicist, coined the phrase "potential energy" in the 19th century. Potential energy comes in a variety of forms, each linked to a particular kind of force. It is the power imparted to an object by its position in relation to other objects. Learn more about potential energy in this article, which includes a definition, several categories, and examples.

The force acting on the two objects affects the formula for potential energy. The following is the formula for gravitational force:

W = m×g×h = mgh

Where,

Potential Energy Unit

In terms of units, kinetic energy and gravitational potential energy are equivalent: kg m2 / s2.

The unit used to measure all energy is the joule, which has the same units as kg m2 / s2 (J).

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Answer:

2.03 × 10⁻⁵ M

Explanation:

Step 1: Given data

Concentration of Pb(NO₃)₂: 6.73 ppm = 6.73 mg/L

Step 2: Convert 6.73 mg/L to mol/L

The molar mass of 331.2 g/mol.

6.73 × 10⁻³ g/L × 1 mol/331.2 g = 2.03 × 10⁻⁵ mol/L = 2.03 × 10⁻⁵ M

Step 3: Calculate the molar concentration of Pb²⁺

Let's consider the ionization of Pb(NO₃)₂.

Pb(NO₃)₂(aq) ⇒ Pb²⁺(aq) + 2 NO₃⁻(aq)

The molar ratio of Pb(NO₃)₂ to Pb²⁺ is 1:1. The molar concentration of Pb²⁺ is 1/1 × 2.03 × 10⁻⁵ M = 2.03 × 10⁻⁵ M.

Based on the given reactions, the compounds are as follows:

A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.

B: The product formed when compound A reacts with 2H2O.

C: The product formed when compound B reacts with K2CO3(aq).

D: The product formed from the heat-induced reaction of compound C.

E: The product formed when compound D reacts with HBr.

Based on the given reactions, let's analyze the compounds involved:

Reaction 1: prop-1-yne + 2HBr/H2O2 = A

The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.

Reaction 2: A + 2H2O = B

Compound A reacts with 2H2O (water) to form compound B.

Reaction 3: B + K2CO3(aq) = C

Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.

Reaction 4: C + heat = D

Compound C undergoes a heat-induced reaction to form compound D.

Reaction 5: D + HBr = E

Compound D reacts with HBr (hydrobromic acid) to form compound E.

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Answer:

\(2.64\text{ L}\)

Explanation:

Assuming that the helium is at standard temperature and pressure (STP), we can use the molar volume of an ideal gas at STP (22.4L) to solve for its volume.

\(\text{Volume} = (\text{number of moles}) \cdot (\text{molar volume at STP})\)

\(V = (0.118\text{ mol}) \cdot (22.4 \text{ L/mol})\)

\(\boxed{V = 2.64\text{ L}}\)

Note that we rounded to 3 significant figures because that is how many significant figures were given by the measurement of helium (0.118 mol).

Answer:

fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, ... Most fans are powered by electric motors

Answer:

The effective number of bonds in sulfate ion is 1.5

Explanation:

The number of chemical bonds between two atoms is known as the bond order.

In covalent bonds between two atoms, a single bond has a bond order of one, a double bond has a bond order of two, a triple bond has a bond order of three.

If there are more than two atoms in a molecule, the effective number of bonds can be determined by applying the following steps:

1. Draw the Lewis structure.

2. Count the total number of bonds.

3. Count the number of bond groups between individual atoms.

4. Divide the number of bonds between atoms by the total number of bond groups in the molecule.

For the sulfate ion, the resonance structure is shown in the attachment below. From the structure;

Total number of bonds = (2 × 2) + (2 × 1) = 6

Total number of bond groups = 4

Effective number of bonds = 6/4 = 1.5

Therefore, the effective number of bonds in sulfate ion is 1.5

In general, bond strength down a group in the periodic table, as the size of the atom bonded to H increases, acid strength, therefore, increases down the group.

Electronegativity is a measure of the tendency of an atom to attract electron density or electrons towards itself.

In a polar covalent bond, electrons are shifted toward the more electronegative atom; therefore, the more electronegative atom is the one with the partial negative charge. The more polarized the electron distribution and the larger the partial charges of the atoms, the greater the difference in electronegativity.

The absolute value of the difference in electronegativity of two bonded atoms provides a rough measure of the polarity to be expected in the bond and the bond type. The bond is covalent and nonpolar when the difference is very small or zero. The bond is polar covalent or ionic when it is large.

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The correct question is:

Consider the compounds shown, which are all acids of group 7 atoms. In general, bond strength down a group in the periodic table, as the size of the atom bonded to h increases. What happens to acid strength down the group?

Answer:

Let's find out time using musically to we not less X elation times T um Sylvia 120 kilometer are and be known to get 70-kilometer bar are jobless acceleration. Relax. The relation is six housing kilometers where R squared times D and solving 40 t is equal to one divided by 120 hours which is equal to 32nd. Let's find a distance traveled using s is equal to a snot. Let's be not times de lis. How 50 square off 80 Um, A. Sees the exploration of car Times T's were no, that's like in numbers. So a distance is equal to 70 uh, kilometer, but are into one divided by 120 hard is less, one divided by two into x elation of God. It is a 6000-kilometer bar are square, are in duty square will t swear. He's one divided by 120 holes where so t is equal to 0.79 kilometers

Explanation:

The structure of  the alkyne 4 - decyne is shown in the image attached.

Alkyne functional group compounds with a triple bond made of carbon and carbon contain 4-decyne (C). The triple bond is found at the fourth carbon position in the ten-carbon chain (decyne) of 4-decyne.

Nine hydrogen atoms (H) are joined to the first nine carbon atoms (C), starting from the left side.

In conclusion, 4-decyne is made up of a chain of ten carbon atoms, with the fourth carbon atom serving as the center of a carbon-carbon triple bond (C). Except for the carbon involved in the triple bond, all carbon atoms are connected to hydrogen atoms.

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A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.

We must compute the empirical formula in order to ascertain the compound's chemical composition.

If we have 100 grams of the compound.

This suggests we have:

30.4 g of nitrogen

69.6 g of oxygen

Now, we have to convert the mass of each element to moles.

The molar mass of nitrogen (N) = 14.01 g/mol

the molar mass of oxygen (O)  =  16.00 g/mol.

Number of moles of nitrogen (N):

2.17 mol

Number of moles of oxygen (O):

4.35 mol

The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.

Moles N / moles O = 2.17 mol / 2.17 mol = 1.00

Moles O / moles O = 4.35 mol / 2.17 mol = 2.00

The ratio is approximately N₁O₂.

We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.

The molecular formula of the compound is NO₂.

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One important chemical reaction in our daily life is the process of cellular respiration, which occurs in living organisms to produce energy in the form of ATP.

The reaction involves the breakdown of glucose, a type of sugar, into carbon dioxide and water, and the release of energy in the process. The general equation for cellular respiration is,

\(C_{6} H_{12} O_{6}\) + \(6O_{2}\) → \(6CO_{2}\) + \(6H_{2}O\) + energy (ATP)

This reaction occurs continuously in our cells, providing the energy needed for various cellular activities and bodily functions. Without cellular respiration, we would not be able to survive.

Another important application of chemical reactions in daily life is in the production of food. Cooking food involves various chemical reactions, including the breakdown of complex carbohydrates and proteins into simpler molecules, the caramelization of sugars, and the Maillard reaction between amino acids and reducing sugars. These reactions help to create the flavor, aroma, and texture of the food we eat.

In addition, chemical reactions are also used in the production of many consumer products, such as cleaning agents, cosmetics, and pharmaceuticals. The chemical reactions involved in these products are carefully designed and controlled to ensure their effectiveness and safety for use.

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Answer:

C

Explanation:

just took the test

The pair of chemical elements which would most likely combine to form a salt is: Cs and I.

An inorganic substance can be defined as a substance that doesn't contain both carbon and hydrogen.

In Chemistry, some examples of an inorganic compound include the following:

A salt comprises an ionic assembly of both the negative ion (anion) of an acid and a positive ion (cation) of a base, which results in the formation of a neutral chemical compound.

Hence, cesium (Cs) which has a a positive charge of one (+1) and an iodine (I) ion with a negative charge of one (-1) would combine or react to form neutral cesium iodide (CsI).

In conclusion, a salt is most likely to be formed from the reaction of cesium (Cs) and iodine (I).

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Answer:

the maximum safe operating temperature the engineer should recommend for this reaction is 616 °C  

Explanation:

Given the data in the question;

First we calculate the Volume of the steel cylinder;

V = πr²h

radius r = Diameter / 2 = 27 cm / 2 = 13.5 cm

height h = 32.4 cm

so we substitute

V = π × ( 13.5 cm )² × 32.4 cm

V  = π × 182.25 cm × 32.4 cm

V = 18550.79 cm³  

V = 18.551 L

given that; maximum safe pressure P = 3.10 MPa = 30.5946 atm

vessel contains 0.218kg or 218 gram of carbon monoxide gas

molar mass of carbon monoxide gas is 28.010 g/mol

so

moles of carbon monoxide gas n = 218 gram /  28.010 g/mol = 7.7829 mol

we know that;

PV = nRT

solve for T

T = PV / nR

we know that gas constant R = 0.0820574 L•atm•mol⁻¹ K⁻¹

so we substitute

T = ( 30.5946 × 18.551 ) / ( 7.7829 × 0.082 )

T = 567.5604 / 0.6381978

T = 889.317387 K

T = ( 889.317387 - 273.15 ) °C

T = 616.167 ≈ 616 °C  { 3 significant digits }

Therefore, the maximum safe operating temperature the engineer should recommend for this reaction is 616 °C  

Answer:

When ethylene is subjected to ozone it forms Acetaldehyde and oxygen is released

Explanation:

Answer: 1.85 (D)

Explanation:

D is the solution to this question