Parallel lines on a Lineweaver-Burk plot indicate
​
​I. an increase in KM.
​II. decrease in KM.
​III. decrease in Vmax.
​IV. uncompetitive inhibition.

The reaction of ammonia burning in the presence of a platinum catalyst to give nitric oxide is exothermic, but the exact value of heat evolved (kJ) cannot be determined.

The reaction being described is the burning of ammonia in the presence of a platinum catalyst to give nitric oxide. The experiment also mentions that the reaction evolves a certain amount of heat, measured in kilojoules (kJ).

To determine if the reaction is endothermic or exothermic, we need to consider the sign of the heat evolved. If heat is released (negative value), the reaction is exothermic, meaning it releases energy. If heat is absorbed (positive value), the reaction is endothermic, meaning it requires energy.

Since the question states that the reaction "evolves" heat, we can assume that the value of heat evolved (kJ) is negative. This indicates that the reaction is exothermic and releases energy.

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Answer:

Transparent Rock Crystal has many electronic uses; it is used as oscillators in radios, watches, and pressure gauges, and in the study of optics. Quartz is also used as an abrasive for sandblasting, grinding glass, and cutting soft stones.

Explanation:

The mass of caffeine in the capsule is approximately 9.71 mg. Therefore, option (B) is correct.

To calculate the mass of caffeine in the capsule, we need to use the concentration of the diluted solution and the volume of the diluted solution.

Given:

- Concentration of the diluted solution = 1.00×10^(-4) M

- Volume of the diluted solution = 500.0 mL = 0.500 L

Using the formula:

Amount of substance (moles) = Concentration × Volume

Amount of substance of caffeine in the diluted solution = (1.00×\(10^{-4}\) M) × (0.500 L)

= 5.00×\(10^{-5}\) mol

Now, we can calculate the mass of caffeine using the formula:

Mass = Amount of substance × Molecular weight

Mass of caffeine = (5.00×\(10^{-5}\)mol) × (194.2 g/mol)

               = 9.71 mg

Therefore, the mass of caffeine in the capsule is approximately 9.71 mg.

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At Standard Temperature and Pressure (STP), the gas that shows the greatest deviation from ideal gas behavior is Sulfur Tetrafluoride (SF4).

An ideal gas is a theoretical gas composed of many randomly moving point particles that are not subject to interparticle interactions. The ideal gas concept is useful because it obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics.An ideal gas is defined as one for which both the volume of molecules and forces between the molecules are so small that they have no effect on the behavior of the gas.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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The activation energy of a reaction can be determined using the Arrhenius equation, the activation energy of this reaction is approximately 43.83 kJ/mol.

First, we need to find the rate constant (k) at two different temperatures, 350 K and 450 K.

At 350 K, the rate constant (k1) is 15.5.

At 450 K, the rate constant (k2) is 65.

Now, we can use the Arrhenius equation:

ln(k2/k1) = (Ea/R) * (1/T1 - 1/T2),

where R is the gas constant (8.314 J/(mol·K)).

Substituting the values, we get:

ln(65/15.5)

= (Ea/8.314) * (1/350 - 1/450).

Simplifying, we have:

ln(4.1935)

= (Ea/8.314) * (0.002857 - 0.002222).

ln(4.1935) = (Ea/8.314) * 0.000635.

Now, we can solve for Ea:

Ea = ln(4.1935) / (0.000635 * 8.314)

Ea ≈ 43.83 kJ/mol

Therefore, the activation energy of this reaction is approximately 43.83 kJ/mol.

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Answer:

The U.S.S.R

Explanation:

Mir, Soviet/Russian modular space station, the core module (base block) of which was launched into Earth orbit by the U.S.S.R. in 1986

Answer:

The Soviet Union, now known as Russia.

Explanation:

Theoretical yield of copper is 7.22 g when 4.25g of iron in the chemical reaction.

2Fe(s) + 3Cu2(aq.) ---->  2Fe3(aq.)  + 3Cu (s)

Molar mass of Iron (Fe) is 56g/mole.

Molar mass of copper (cu) is 63.5g/mole.

2 mole ( 2 * 56g/mole) Iron produces = 3 mole ( 3 * 63.5g/mole ) copper

Theoretical yield is the maximum amount of product that could be formed from the given amounts of reactants. The actual yield is the amount of product that is actually formed when the reaction is carried out in the laboratory. The theoretical yield is the amount of product that would be formed from a reaction if it was 100% efficient.

There are 4. 25 g of Iron .so,

4.25 g Iron produces = (3 * 63.5g / 2 * 56 g ) * 4.25 g copper

                                     = 7.22 g copper

Theoretical yield of copper is 7.22g.

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Antoine Lavoisier proposed the Law of Conservation of Mass in 1789.

According to the mass conservation principle, mass in a closed system cannot be created or destroyed, but can only be transformed from one state to another. This means that the system's total mass stays constant over time, regardless of physical or chemical changes within the system.

This law is a fundamental principle in many branches of science, including chemistry and physics, and it has significant consequences for understanding how matter and energy behave in the universe. The idea of energy conservation is closely related to the law of conservation of mass, which says that the total amount of energy in a closed system is also conserved over time.

These laws, taken together, provide a framework for understanding the basic properties of matter and energy, as well as how they interact in the universe.

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The complete question :

Describe the Law of Conservation of Mass?

According to the law of conservation of mass, the statement that is always true about chemical reactions is: A) In a chemical reaction, matter is not created or destroyed, but is conserved.

A chemical reaction is the process in which one or more substances change into different substances. The starting substances are called reactants, and the substances that are produced are called products.

The law of conservation of mass states that in a chemical reaction, matter is not created or destroyed, but is conserved. This implies that the mass of the reactants is equal to the mass of the products. This law means that the amount of matter that exists before and after a chemical reaction is the same.

Hence, the correct option for the statement about chemical reactions that is always true according to the law of conservation of mass is A. In a chemical reaction, matter is not created or destroyed, but is conserved.

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The NFPA chemical hazard codes indicate the level of health, flammability, and instability hazards associated with a particular chemical. However, they do not indicate the specific chemical composition or properties of the substance.

The NFPA chemical hazard codes indicate all of the following:

1.The level of health hazard associated with a chemical

2.The level of flammability hazard associated with a chemical

3.The level of reactivity hazard associated with a chemical

4.The specific type of protective equipment needed when working with a chemical

The NFPA chemical hazard codes do not indicate the environmental impact of a chemical.

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The wavelength of a photon emitted during an electron transition in the hydrogen atom is inversely proportional to the energy difference between the initial and final energy states.

To determine the electron transition that corresponds to the emission of a photon with the longest wavelength, we need to identify the transition with the smallest energy difference.

The energy levels in the hydrogen atom are given by the formula:

E = -13.6 eV / n^2

where n is the principal quantum number.

Let's examine the given transitions:

a) 8 → 5: The energy difference is E(8) - E(5) = -13.6 eV / 8^2 - (-13.6 eV / 5^2) = -1.7 eV - (-3.44 eV) = 1.74 eV.

b) 2 → 5: The energy difference is E(2) - E(5) = -13.6 eV / 2^2 - (-13.6 eV / 5^2) = -3.4 eV - (-3.44 eV) = 0.04 eV.

c) 5 → 8: The energy difference is E(5) - E(8) = -13.6 eV / 5^2 - (-13.6 eV / 8^2) = -3.44 eV - (-1.7 eV) = -1.74 eV.

d) 5 → 2: The energy difference is E(5) - E(2) = -13.6 eV / 5^2 - (-13.6 eV / 2^2) = -3.44 eV - (-3.4 eV) = -0.04 eV.

From the analysis, we can see that the transition with the smallest energy difference (and thus the longest wavelength) is:

b) 2 → 5

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In order to find the rate of consumption of HCl in moles/s, you would need to know the balanced equation for the chemical reaction involving magnesium and HCl.

One common reaction is the reaction between magnesium and hydrochloric acid:

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

If the rate of consumption of magnesium is 5.0 × 10^-9 mol/s, this means that 5.0 × 10^-9 moles of magnesium are being consumed per second. In this reaction, one mole of magnesium reacts with 2 moles of HCl, so for every mole of magnesium consumed, 2 moles of HCl are also consumed.

Therefore, the rate of consumption of HCl in moles/s can be calculated by multiplying the rate of consumption of magnesium by 2:

rate of consumption of HCl = (rate of consumption of Mg) * 2

rate of consumption of HCl = (5.0 x 10^-9 mol/s) * 2 = 1.0 x 10^-8 mol/s

So the rate of consumption of HCl in moles/s is 1.0 x 10^-8 moles/s.

Answer:

The reason is carbon's ability to form stable bonds with many elements, including itself. 

Explanation:

This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things!

Answer:

Explanation:

The reason is that carbon is able to form stable bonds with many elements, including itself, which allows carbon to form a huge variety of very large and complex molecules.

Explanation:

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arrow_backSources of Information on Modern Indian History

Summary

Videos

References

A primary source of information for historians is the official records of the British administration. The British kept written records of every key instruction, meeting, transaction, investigation, plan, policy decision and agreement. They attached record rooms with all the important administrative institutions.

The British built specialized institutions like museums and archives to preserve important documents.

Historians gather important information about the provincial administrative system from the reports, memos, notings and letters preserved in the 19th century in the archives and record rooms across India.

For effective administration, the British carried out a number of surveys in the early 19th century.

By the end of the 19th century, censuses of all the Indian provinces were being carried out every ten years. This helped to collect information on the religion, caste and occupation of the people. These surveys have helped historians to collect information about modern India.

Personal diaries of personalities like Jawaharlal Nehru and Sardar Vallabhbhai Patel, newspapers, popular books like The Discovery of India and Glimpses of World History, autobiographies of personalities like Mahatma Gandhi, and accounts of travellers and pilgrims give a deep insight into the lives of the common people.

Answer:

There are three forces acting on the skateboard. One of these forces is the weight of the rider. Another is the force of gravity on the board itself. The third is the force of the ground pushing up on the skateboard.

Answer:

different types of waves are due to how and where they are formed

Explanation:

Don't give me brainliest I only know first part.

The mass of 49.5 mL of silver can be calculated using the given density of silver as 10.49 kg/L.

To convert the volume from mL to L, we divide by 1000:

Volume of silver = 49.5 mL / 1000 = 0.0495 L

Next, we can use the density formula: density = mass / volume, to calculate the mass of silver:

mass = density * volume = 10.49 kg/L * 0.0495 L = 0.519855 kg

Since the question asks for the mass in grams, we can convert the mass from kilograms to grams by multiplying by 1000:

mass = 0.519855 kg * 1000 = 519.855 g

Therefore, the mass of 49.5 mL of silver is approximately 519.855 grams.

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If you continue to add more solid solute to its saturated aqueous solution at the constant temperature the additional solute will remain as solid and sink to the bottom of the container. So, the correct option is (b).

A saturated solution is one that has attained its maximal solubility. At this stage, adding extra solute will prevent it from dissolving in the solution. Instead, it will continue to form a solid precipitate at the bottom of the solution.

The presence of some undissolved solid solute in a saturated solution lets you know it is one. Currently, adding more solute will only increase the amount of solid at the solution's bottom without altering the solution's concentration. At equilibrium, a saturated solution exists.

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The volume of 6.25 × 10⁻⁴ molar ferroin solution needed to prepare   10 ml of 2.50 × 10 ⁻⁵ molar solution with deionized water is 0.4 ml.

Molarity is a term used to express the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in liters. The number of moles of the solute is thus the product of its molarity and volume in liters.

Let V1 and M1 be the volume and molarity of the stoke solution and V2 and M2 be the volume and molarity of the solution to be prepared from its. Then,

M1 V1 = M2 V2.

Given the molarity and volume of the solution to be prepared is  10 ml and 2.50 × 10 ⁻⁵ m respectively. The molarity of stoke solution is 6.25 × 10⁻⁴ molar. Thus, the volume of stoke solution needed to be added is calculated as follows:

volume = molarity of solution to be prepared × volume / molarity of stoke solution

            =  (2.50 × 10 ⁻⁵ m × 10 ml ) /6.25 × 10⁻⁴

            = 0.4 ml

Therefore, the volume of ferroin solution  needed to be added is 0.4 ml.

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Answer: When you lick a Popsicle, how does the thermal energy travel between the Popsicle and you tongue? What kind of heat transfer is that? Heat travels from warmer to cool objects, so thermal energy is transferred from your tongue to the Popsicle, melting the Popsicle. This kind of heat transfer is conduction.

HOPE THIS HELPS

Answer:

it transfer througe your tonuge because it is a at a higher temperture

than the popsicle

Conduction

A sample of titanium-45 will degrade from 65 grams to 25 grams in 4.24 hours.

The formula for the half-life of a first-order reaction is = 0.693/k.

Half-life is 3.08 hours, given.

So k = 0.225

First order reaction rate is calculated using:

where k is the reaction rate and 0.225 is the reaction time

R' = 25g, the total quantity.

original quantity = 65g

With these parameters entered, we obtain t=4.24 hours.

As a result, a sample of titanium-45 will degrade from 65.0 grams to 25.0 grams in 4.24 hours.

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Answer:

+1

Explanation:

Sodium has one electron in its outermost shell. Sodium can not be able to accept seven electrons because the energy required for that process is very high. Sodium would rather loose its only valence electron to form a univalent positive ion Na^+.

This is an easier process. When sodium looses one electron, it now has a charge of +1.

In the mass spectrum of pentane, the presence of a peak with m/z = 57 is most likely to the detection of a butyl radical cation.

Because all molecular ions fragment, a few compounds have mass spectra that lack a molecular ion peak. That is not a problem you will encounter at A'level. In the mass spectrum of pentane, for example, the heaviest ion has an m/z value of 72.

Lines with m/z values one or two lower than one of the simple lines, for example, are frequently caused by the loss of one or more hydrogen atoms during the fragmentation process. The base peak (the tallest peak and thus the most common fragment ion) is at m/z = 57 this time. This, however, is not produced by the same ion as the pentane m/z value peak.

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The mass of sodium phosphate needed to make 375 mL (0.375 L) of a solution with a molarity of sodium ions of 0.900 M is 18.45 g.

Because each mole of sodium phosphate produces 3 moles of sodium ions upon dissociation, the molarity (c) of the sodium phosphate solution will be c = 0.900 M / 3

c = 0.300 M.

Now we can use the molarity and the volume of the solution (V) to find the required number of moles (n) of sodium phosphate.

c = n/V ⇒ n = c*V

n = 0.300 M * 0.375 L

n = 0.1125 mol

Finally, using the molar mass of sodium phosphate (M = 164 g/mol), we can calculate the mass (m) of sodium phosphate required:

n = m/M ⇒ m = n*M

m = 0.1125 mol * 164 g/mol

m = 18.45 g

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6.07 grams is the theoretical yield of calcium phosphate (Ca₃(PO₄)₂).

Mass of any substance can be calculated by using moles as:

n = W/M, where

W = required mass

M= molar mass

Given chemical reaction is:

3Ca(NO₃)₂ + 2Na₃PO₄ → 6NaNO₃ + Ca₃(PO₄)₂

From the stoichiometry it is clear that:

3 moles of Ca(NO₃)₂ = produce 1 mole of Ca₃(PO₄)₂

Given mass of Ca(NO₃)₂ = 96.1g

Mole of Ca(NO₃)₂ = 96.1g/164g/mol = 0.5859moles

So, 0.5859 moles of Ca(NO₃)₂ = produce 0.5859×1/3 = 0.0196 moles of Ca₃(PO₄)₂

Required mass of Ca₃(PO₄)₂ will be calculated by using moles as:

W = 0.0196mole × 310g/mole = 6.07 grams

Hence, 6.07 grams is the theoretical yield of calcium phosphate.

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250 kJ of energy are removed from a 4.00 x 102 g sample of water at 60˚C. Will the sample of water completely freeze: Yes, because there is enough energy.

250 kJ of energy are removed from a 4.00 x 102 g sample of water at 60˚C. Will the sample of water completely freeze: Yes, because there is enough energy.

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Answer:

243.05 gm of Fe2O3

Explanation:

From periodic table   mole wt of Fe = 55.845 gm

  170 g / 55.845 gm/mole = 3.044 moles  Fe

From equation

 4 Fe ====> 2 Fe2 O3

      so 1/2 as many moles  as Fe    3.044 / 2 = 1.522 moles of Fe2O3

             mole wt of Fe2 O3   from periodic table = 159.687 gm/mole

                       1.522 moles * 159.687 gm/mole = 243.05 gm

0.50 mol SiO₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

30 g SiO₂ (sand)

Step 2: Identify Conversions

Molar Mass of Si - 28.09 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of SiO₂ - 28.09 + 2(16.00) = 60.09 g/mol

Step 3: Convert

Step 4: Check

Follow sig figs and round. We are given 2 sig figs.

0.499251 mol SiO₂ ≈ 0.50 mol SiO₂

Answer:

\(\boxed {\boxed {\sf About \ 0.5 \ moles \ of \ SiO_2}}\)

Explanation:

To convert from grams to moles, we must use the molar mass.

1. Molar Mass

Use the Periodic Table to find the masses of the individual elements (silicon and oxygen) in sand.

Examine the formula for sand: SiO₂. There is a subscript of 2 after oxygen, so there must be 2 oxygen atoms. Multiply oxygen's mass by 2 and add silicon's mass to find the molar mass of sand.

2. Calculate Moles

Use the molar mass as ratio.

\(\frac{60.083 \ g \ SiO_2}{1 \ mol \ SiO_2}\)

Multiply by the given number of grams (30)

\(30 \ g \ SiO_2 * \frac{60.083 \ g \ SiO_2}{1 \ mol \ SiO_2}\)

Flip the fraction so the grams of sand will cancel.

\(30 \ g \ SiO_2 *\frac{1 \ mol \ SiO_2}{60.083 \ g \ SiO_2}\)

\(30 *\frac{1 \ mol \ SiO_2}{60.083 }\)

\(\frac{30 \ mol \ SiO_2}{60.083 }\)

\(0.499309289 \ mol \ SiO_2\)

3. Round

The original measurement of grams has 1 signfiicant figure. We must round our answer to 1 sig fig.

For the answer we found, that is the tenth place. The 9 in the hundredth tells us to round the 4 to a 5.

\(\approx 0.5 \ mol \ SiO_2\)

There are about 0.5 moles of SiO₂ in 30 grams.