your inclunation to use the same soutions to solve similar problems is known as, while using the same solution for two diffrent problems that hold the same structure is known as

Okay, let's solve this step-by-step:

1) AT = -7.0 K (given)

2) C = 410 J/K (given)

3) Mass of reactant = 0.20 mol (given)

4) To convert temperature change (K) to energy change (J): Energy change = Heat capacity x Temperature change

So in this case: Energy change = 410 J/K x -7.0 K = -2870 J

5) To get enthalpy change per mole (AH), we divide the total energy change by the number of moles of reactant:

-2870 J / 0.20 mol = -14350 J/mol

Therefore, AH = -14350 J/mol.

Let me know if you have any other questions!

To determine the enthalpy change (∆H) for the reactant, first use the relationship q = C × ∆T to calculate the heat exchange in the reaction. Then, convert the resulting value from joules to kilojoules. Finally, divide by the number of moles of the reactant to find ∆H. The enthalpy change for the reaction is -14.35 kj/mol.

This chemistry problem involves the use of thermochemical equations and calorimetry principles. Given in the problem, the change in temperature (∆T) is -7.0 K, the heat capacity (C) of the calorimeter and contents is 410 J/K, and a mole of reactant involved is 0.20 mol. Let's use the equation q = C × ∆T to calculate the heat absorbed or released in a reaction where q is the heat gained or lost, C is the calorimeter’s heat capacity, and ∆T is the change in temperature. Hence, the heat exchange (q) = 410 J/K * -7.0 K = -2870 Joules.

This value is negative because it's giving off heat (exothermic). We see that the value obtained is in joules, but we need the output in Kj. 1 Joule is 1x10^-3 Kj, so -2870 Joules is -2.87 Kj. To find ∆H (Enthalpy change), we divide the heat exchanged by the amount of moles. Therefore, ∆H = q/n = -2.87 Kj / 0.20 moles = -14.35 Kj.mol⁻¹. So the enthalpy change for the reaction is -14.35 Kj.mol⁻¹.

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Answer:

426 mg = 4.26 x 10² mg

Explanation:

1 cup = 237.6 mL x 1 L/1000 mL = 0.2376 L

We divide the liters of milk the student drinks into the volume in liters of a cup to calculate the number of cups the student drinks per day:

number of cups per day = 0.318 L/0.2376 L = 1.34 cup

Now, we multiply the number of cups by the amount of calcium that a cup of milk has:

amount of calcium = 1.34 cup x 318 mg = 426 mg = 4.26 x 10² mg

Therefore, the student gets 426 mg (or 4.26 x 10² mg) of calcium in one day.

Answer:

The most common drinking water contaminants are microorganisms, nitrate, and arsenic.

Explanation:

Answer:

it is chemical , sewage , factory pollution , wastes, etc

Answer:

YEESSS

Explanation:

Because that seems like the only logical answer.

Answer:

YES

Explanation:

YES

It is not possible to conclude that light carries energy by comparing the temperature of the two thermometers.

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2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.

Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.

moles = concentration (M) x volume (L)

Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:

moles = 10.0 M x 2.50 L

moles = 25.0 mol

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Answer:

C. oxygen

Explanation:

oxygen cannot for a polar covalent bond with another oxygen atom

Answer:

oxygen

Explanation:

Answer:

ano po anggaba naman point

Answer:

Resistance

Explanation:

Resistance is the measure of the opposition of current in a circuit.

Explanation:

The name for the compound PbO₂ is lead (IV) oxide. The oxidation state of lead is +4 and the oxidation state of oxygen is -2. Actualy the oxidation state of oxygen in oxides is always -2.

Answer: the oxidation state of O in PbO₂ is -2.

The oxidation number of oxygen in the compound PbO₂ is -2. The oxidation number of an atom can be positive, negative, or zero.

Let's assume that the oxidation number of lead (Pb) is x and the oxidation number of oxygen (O) is y. The compound PbO₂ is neutral, which means the sum of the oxidation numbers must be zero.

The oxidation number of Pb is known to be +4 because PbO₂ is lead dioxide, whereas oxygen is typically assigned an oxidation number of -2.

Thus,

(+4) + 2(y) = 0

4 + 2y = 0

2y = -4

y = -2

Therefore, the oxidation number of oxygen (O) in PbO₂ is -2.

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Answer: acid rain

Explanation: Acid rain is one way in which rocks can be chemically weathered. It can harm forests and crops, damage bodies of water, and contribute to the damage of statues and buildings. In this activity you will simulate the chemical weathering of limestone, which is a soft, sedimentary rock that reacts easily to acid rain.

True: Oxidative phosphorylation relies on the hydrogen ion concentration gradient generated and maintained by the electron transport chain.

As electrons pass through the electron transport chain, hydrogen ions are pumped from the mitochondrial matrix into the intermembrane space, creating a concentration gradient. True: Hydrogen ions are actively transported out of the mitochondrial matrix. This occurs during the electron transport chain, where complexes pump hydrogen ions across the inner mitochondrial membrane from the matrix into the intermembrane space. True: Hydrogen ion concentration is lower in the mitochondrial matrix than in the intermembrane space. The electron transport chain pumps hydrogen ions out of the matrix, resulting in a higher concentration of hydrogen ions in the intermembrane space. True: Energy is generated as a result of the difference in hydrogen ion concentration between the mitochondrial matrix and the intermembrane space. This difference in concentration creates an electrochemical gradient, which is used by ATP synthase to produce ATP through oxidative phosphorylation.

In summary, statements 1, 2, 3, 5 are accurate, while statements 4 and 6 are not accurate.

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When 22.0 g of water is heated from 25.0°C to 100.0°C,q is 6903 Joules.

1. Determine the mass of the water (m): 22.0 g
2. Determine the initial temperature (T1): 25.0°C
3. Determine the final temperature (T2): 100.0°C
4. Calculate the change in temperature (ΔT): ΔT = T2 - T1 = 100.0°C - 25.0°C = 75.0°C
5. Use the specific heat capacity of water (c): 4.18 J/(g·°C)
6. Apply the formula for heat transfer (q): q = m × c × ΔT

Now, plug in the values:

q = 22.0 g × 4.18 J/(g·°C) × 75.0°C

q = 6903 J

So, when 22.0 g of water is heated from 25.0°C to 100.0°C, q is 6903 Joules.

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yes , this is a reaction.

in this sodium hydroxide reacts with copper sulfate

Answer:

No, scientists did not accept Wegener's theory

Explanation:

In a book titled; "The Origin of Continents and Oceans", published in 1915, Wegener introduced his ideas about the theory of continental drift.

According to his idea, "all the continents were once joined together in an "Urkontinent" before breaking up and drifting to their current positions"(live science).

Though some of his ideas were correct, some of them were also quite wrong. Scientists rejected his idea because he did not detail any mechanism by which the continental drift occurs.

Answer:

13

Explanation:

Let's consider the unbalanced equation for the combustion of propane.

C₃H₈ + O₂ ⇒ CO₂ + H₂O

We will begin balancing H atoms by multiplying H₂O by 4.

C₃H₈ + O₂ ⇒ CO₂ + 4 H₂O

Now, we balance C atoms by multiplying CO₂ by 3.

C₃H₈ + O₂ ⇒ 3 CO₂ + 4 H₂O

Finally, we get the balanced equation multiplying O₂ by 5.

C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O

The sum of the coefficients is 1 + 5 + 3 + 4 = 13.

Answer:   Because planets do not have nuclear fusion, they do not produce their own light. Instead, they shine with light reflected from a star. When we see planets in the night sky, such as Venus, the so-called "Evening Star," we're seeing reflected sunlight.

Explanation:

C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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The empirical formula and the m0lecular formula of the organic compound

is  CH5O3 and C2H10O6

mass % of C = 12/44 × 7.455/9.119 × 100 = 22.2938

mass % of H = 2/18 × 3.053/9.119 × 100 = 3.716

mass % of O = 100 - [ 22.2938+ 3.716]

                      = 73.991

moles of C = 22.2938/12 = 1.33 = 1.33/1.33 = 1

moles of H = 6.6999/1 = 6.66/1.33 = 5

moles of O = 73.991 / 16 = 4.5 = 4.5/1.33 = 3

empirical formula = CH5O3

Molecular formula = (empirical formula)n

n = molar mass/ empirical mass = 88.11/65 = 2

Molecular formula = C2H10O6

The most straightforward whole number ratio of atoms in a compound is its empirical formula. The empirical formula of sulphur monoxide, abbreviated SO, and disulfur dioxide, abbreviated S2O2, are two straightforward examples of this idea. As a result, the empirical formula for sulphur monoxide and disulfur dioxide, two compounds made of sulphur and oxygen, is the same. Their molecular formulae, which represent how many atoms are present in each molecule of a chemical compound, are different.

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The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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Answer:

It looks correct, yes.

Explanation:

Iron oxide are chemical compounds composed of iron and oxygen, which is known as rust.

Answer:

Firstly, search for proper Job by which she can earn money & from that money she can use it for her study

Explanation:

If I was in that situation, then I would do this.

I am sorry if you wouldn't like mine suggestion

Answer:

c: The equilibrium position will shift away from what was added to lower its concentration.

Explanation:

Answer: C. The equilibrium position will shift away from what was added to lower its concentration.

Explanation:

If we have a system that is already in equilibrium, the addition of an extra amount of one of the reactants or one of the products throws the system out of equilibrium. Either the forward or the reverse reaction will then occur to restore equilibrium conditions.

Answer:

The answer is D. Substances Y and Z would react to replace substance W, and the position of equilibrium would shift to the left.

Explanation:

PLZ BRAINLIEST'!!!

The balanced equation of the reaction of Tin (II) Phosphite and  Carbonous Acid to produce Tin (II) Carbonite and Phosphorous Acid is given below:

A balanced equation of a reaction is an equation that shows a balance between the number of moles of elements that reacted and the number of moles of elements that were produced.

A balanced equation of a reaction obeys the law of conservation of matter which states that matter can neither be created nor destroyed.

In a balanced equation of reaction, the moles of atoms of elements on the reactants side of the reaction is equal to the number of moles of atoms on the product side.

To balance equations, numerical coefficients are placed in front of equations.

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The correct answer is:

A. 2 g of water and 1 g of oxygen gas will be produced.

For the given reaction: 2H₂O₂(aq) → 2H₂O(l) + O₂(g)

To determine the amount of water and oxygen gas produced from 2 g of hydrogen peroxide (H₂O₂) using the given balanced equation:

Calculate the molar mass of H₂O₂:

2 g H₂O₂ * (1 mol H₂O₂ / molar mass H₂O₂) = moles of H₂O₂

Use the molar ratios to determine the moles of H₂O and O₂ produced:

moles of H₂O₂ * (2 mol H₂O / 2 mol H₂O₂) = moles of H₂O

moles of H₂O₂ * (1 mol O₂ / 2 mol H₂O₂) = moles of O₂

Convert the moles of H₂O and O₂ to grams:

moles of H₂O * (molar mass H₂O / 1 mol H₂O) = grams of H₂O

moles of O₂ * (molar mass O₂ / 1 mol O₂) = grams of O₂

Based on the given balanced equation, the molar mass of H₂O₂, and the molar masses of H₂O and O₂, we can calculate the actual amounts:

Calculate the moles of H₂O and O₂:

moles of H₂O = moles of H₂O₂

moles of O₂ = 0.5 * moles of H₂O₂

Calculate the grams of H₂O and O₂:

grams of H₂O = moles of H₂O * (molar mass H₂O / 1 mol H₂O)

grams of O₂ = moles of O₂ * (molar mass O₂ / 1 mol O₂)

Since the molar mass of H₂O is 18.015 g/mol and the molar mass of O₂ is 31.9988 g/mol, we can substitute these values into the equations.

After performing the calculations, we find that:

grams of H₂O = 2 g

grams of O₂ = 16 g

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Before shearing teeth, four limbs, an amniotic egg, and fur evolved. Claws that retract after shearing teeth have been produced.

According to the "inside-out" idea, teeth first developed from endoderm as pharyngeal teeth in jawless vertebrates and then travelled anteriorly into the oral cavity as jaws developed.

These are technically the "roaring cats," which include tigers, lions, jaguars, and leopards. They all have fully retractable claws, just like domestic or pet cats. This adaptation or trait makes sure that when their claws are not being utilized to seize prey, climb, scratch, or give traction, they are covered by a sheath of skin and are not visible.

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The majority of valence electrons are negatively charged particles, and they are all grouped in various orbitals or shells. Additionally, these electrons are in charge of how atoms interact with one another and create chemical bonds.

An element is defined as the pure substance which consists of only one type of atom which all have the same numbers of protons in their nuclei. Elements are the simplest chemical forms which cannot be broken down through chemical reactions.

Here the element potassium has the atomic number 19 and its electronic configuration is 2, 8, 8, 1. It contains the four energy levels, they are 'K', 'L', 'M' and 'N'. The number of valence electrons in potassium is 1.

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Your question is incomplete, most probably your full question was:

Which element has 1 valence electron and 4 energy levels?