What is the molarity of a naoh solution if 15.5 ml of a 0.220 m h2so4 solution is required to neutralize a 25.0-ml sample of the naoh solution?

Explanation:

the sulfur ato is in group 6 of the periodic table. In order to become an ion the ato needs to gain 2 electrons so it has a full outer shell of electron and is stable. so the atom S goes to S2+ + 2e

Answer:

C

Explanation:

LIFE LESSON: mixing cleaning products can create toxic chemicals and gas. please do NOT attempt doing anything like that kids.

The amount of heat gained by the water is 500 calories. Thus, option D is correct.

Given:

Mass of water (m) = 100 g

Change in temperature (ΔT) = 30°C - 25°C = 5°C

The specific heat capacity of water (c) is approximately 1 calorie/gram°C.

Now, the amount of heat gained by the water,

Q = mcΔT

Where:

Q is the heat gained or lost by the substance

m is the mass of the substance

c is the specific heat capacity of the substance

ΔT is the change in temperature

Plugging in the values into the formula:

Q = 100 × 1 × 5

Q = 500 calories

Therefore, the amount of heat gained by the water is 500 calories.

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Answer:

laughing this question is a joke I think at first .

Explanation:

there are many mistakes : electrons are revolving in shell or orbits around the nucleus.

first shell always has two electron

after first shell , all shells contains eight electrons

electron have negative charge

proton have positive charge

nucleus have no charge

atom is neutral becoz the + charge of proton. and - charge of electron cancel each other's effect and atom is stable and neutral

Explanation

Given:

ΔG° = 13.8 kJ/mol = (13.8 x 1000) J/mol = 13800 J/mol

Temperature, T = 25.0°C. = 25.0°C + 273 = 298.0 K

What to find:

the value of the equilibrium constant, K for the reaction at 25.0°C.

Step-by-step solution:

Both K and ΔG° can be used to predict the ratio of products to reactants at equilibrium for a given reaction.

ΔG° is related to K by the equation ΔG°= −RTlnK.

R is the molar gas constant, ( R = 8.3144598 J/K/mol)

If ΔG° < 0, then K > 1, and products are favored over reactants at equilibrium.

The next step is to substitute the values of ΔG° and T into the equation to get K.

ΔG°= −RTlnK

13800 J/mol = -(8.3144598 J/K/mol x 298 K x lnK)

13800 J/mol = -(2477.70902 J/mol x lnK)

Divide both sides by 2477.70902 J/mol

Answer:

Magnets are used to make a tight seal on the doors to refrigerators and freezers. They power speakers in stereos, earphones, and televisions. Magnets are used to store data in computers, and are important in scanning machines called MRIs (magnetic resonance imagers), which doctors use to look inside people's bodies.

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Answer:

D atoms of the same element which have different numbers of neutrons

Explanation:

Isotopy is the existence of two or more atoms of the same element having the same atomic number but difference mass number due to differences in the number of neutrons in their various nuclei.

8.4 grams of H2 must combust in order to release 1.2x10³ kJ of heat.To answer your question, we need to use the equation:
ΔH = q = nΔHc

Where ΔH is the heat of combustion, q is the heat released, n is the number of moles of hydrogen gas combusted, and ΔHc is the heat of combustion per mole of hydrogen gas.

First, we need to calculate the number of moles of hydrogen gas that will combust to release 1.2×103kj of heat:
n = q/ΔHc
n = (1.2×103kJ) / (-285.8kJ/mol)
n = -4.196 mol
Note that the negative sign indicates an exothermic reaction (heat released).
Now we need to convert the number of moles of hydrogen gas to grams:
mass = n x molar mass
mass = -4.196 mol x 2.016 g/mol
mass = -8.46 g
Again, the negative sign indicates that we are dealing with a reactant that is being consumed in the reaction.

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Answer:

0

Explanation:

im pretty sure its 0 pls mark me as brainliest

The child's gravitational potential energy on top of the hill is 720 joules. Therefore, option C is correct.

The gravitational potential energy (PE) of an object is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical distance from a reference point.

The weight of the child on the bike, is 180 newtons. Weight is the force due to gravity acting on an object, and it is equal to the product of mass and acceleration due to gravity (W = mg).

To convert from newtons to joules, use the fact that 1 joule is equal to 1-newton meter. Therefore, the gravitational potential energy can be calculated as:

PE = W h

Since weight (W) is equal to mass (m) multiplied by the acceleration due to gravity (g), and g is 9.8 m/²,

PE = (mg) h

Given that the weight of the child is 180 newtons and the height (h) is 4 meters, calculate the gravitational potential energy:

PE = (180 N) × (4 m)

PE = 720 joules

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Answer:

is not completely ionized in water

The ethanoic acid (acetic acid) is considered as a weak acid because it does not releases all of its hydrogen in water, rather it dissociates partially and establishes an equilibrium with its conjugate base.

Answer:

what do you mean by magnetic and sound energy

Answer:

Plants

Explanation:

Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination. HOPE it helps

Solids, liquids, and gases differ in terms of packaging of the atoms in its constituent atomic level.

Solids, liquids, and gases are the three main states of matter. They differ in the way their atoms or molecules are arranged and how they interact with one another. Solids have a definite shape and a definite volume. The atoms or molecules in a solid are tightly packed together and are not free to move around. Solids also have a low compressibility and a high density. Liquids have a definite volume but no definite shape. They take the shape of their container. The atoms or molecules in a liquid are close together but are free to move around. Liquids have a low compressibility and a lower density than solids. Gases have no definite shape or volume. They expand to fill their container. The atoms or molecules in a gas are widely spaced and are free to move around. Gases have a high compressibility and a low density. Examples of gases include air, oxygen, and natural gas. In summary, Solids have a fixed shape and volume, liquids take the shape of their container, have a definite volume and gases have no fixed shape or volume and expand to fill their container.

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In the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.

An atomic model is a graphic representation and/or diagram used to identify the components of atoms.

An atomic model may have into account all its components (i.e., electrons, protons, and neutrons).

In conclusion, in the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.

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Answer:

Single-Replacement Reaction

General Formulas and Concepts:

Types of Reactions

Explanation:

Step 1: Define reaction

CaCl₂ + F₂ → CaF₂ + Cl₂

Step 2: Identify backplate

Single-Replacement Reactions: A + BC → AB + C

BC = CaCl₂

A = F₂

AB = CaF₂

C = Cl₂

The factors affecting the rate of sugar dissolution in water are temperature and surface area, with higher temperatures and smaller sugar particles leading to faster dissolution. Stirring further enhances the dissolution rate.

Based on the provided experiment, the data table is attached in the image below:

Conclusion:

Sugar dissolves faster in hot water compared to warm and cold water. This indicates that temperature impacts the rate of dissolution, with higher temperatures leading to faster dissolution.

Granular sugar dissolves faster than sugar cubes in the same temperature of water. This suggests that the surface area of the sugar particles influences the rate of dissolution, with smaller granules having a larger surface area and therefore dissolving more quickly.

Stirring the water speeds up the dissolution process for both granular sugar and sugar cubes. Stirring helps in increasing the contact between the sugar and water, facilitating the dissolution process.

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Answer:

A)provide a basis for virtually all modern anaesthetic techniques

restore tissue oxygen tension by improving oxygen availability in a wide range of conditions such as COPD, cyanosis, shock, severe hemorrhage, carbon monoxide poisoning, major trauma, cardiac/respiratory arrest

aid resuscitation

provide life support for artificially ventilated patients

aid cardiovascular stability

B)Pure oxygen, instead of air, is used to increase the flame temperature to allow localized melting of the workpiece material (e.g. steel) in a room environment. ... Welding metal results when two pieces are heated to a temperature that produces a shared pool of molten metal.

Answer:

Internal Cue

Explanation:

Answer:

an internal cue

Explanation:

just think

Answer:

0.5059kg

Explanation:

The heat absorbed for the water is determined using the equation:7

Q = C×m×ΔT

Where Q is heat absorbed (4300cal)

C is specific heat (1cal/g°C)

m is the mass in grams

ΔT is change in °C (101.0°C - 92.5°C = 8.5°C)

Replacing:

4300cal = 1cal/g°C×m×8.5°C

505.9g = m

In kg, the mass of water is:

Given :

pH of solution of mixture of lactic acid and lactate is 4.26 .

To Find : \(log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4\)

The ratio of the lactate concentration to the lactate .

Solution :

We know , pKa of lactic acid is :

pKa = 3.86 .

Now , the solution of lactic acid and lactate is a buffer solution .

So , pHof buffer acid is given by :

\(pH=pKa+log(\dfrac{[Salt]}{[Acid]})\)

Putting all given values :

\(log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4\)

Taking anti log both the sides , we get :

\(\dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]} = 2.51\)

Therefore , the ratio of the lactate concentration to the lactate is 2.51 .

Hence , this is the required solution .

Answer:

Pros: No vehicle emissions other than water vapor. Fuel economy equivalent to about twice that of gasoline vehicles. Hydrogen is abundant, and can be made from renewable energy. Cons: This space-age technology is expensive.

Answer:

The pros of hydrogen fuel cells are that they are very efficient, producing very little waste. They are also very stable, which makes them safe to use.

The cons of hydrogen fuel cells are that they can be expensive to produce and maintain, and they require a lot of energy to power them, meaning that they often aren't as efficient as they could be.

Despite these pros and cons, hydrogen fuel cells are still a very promising technology. With more research, attention, and development, they could be a powerful force in the fight against carbon emissions and global warming.

Based on the balanced equation, if we have 0.08 moles of Iron (Fe), we can conclude that 0.08 moles of Hydrogen (H₂) will be formed as well.

First we need to balance the chemical equation for the reaction involving Iron (Fe) and Hydrogen (H).

The reaction will be between Fe and HCl (hydrochloric acid) to produce hydrogen gas (H₂) and iron chloride (FeCl₂):

Fe + 2HCl → FeCl₂ + H₂

From the balanced equation, we can see that for every 1 mole of Fe reacted, 1 mole of H₂ is formed. Therefore, if we have 0.08 moles of Fe, we can conclude that 0.08 moles of H₂ will be formed as well.

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Answer:

27.50 g

Explanation:

Unless weight was somehow gained/lost during the reaction, the products should weigh as much as the reactants. Since this isn't specified the mass of the reactants should be equal to the mass of the products.

Russia is a federation with a semi-presidential political system. The President is the head of state while the Prime Minister is the head of government. The Federal Assembly is a bicameral legislature that is made up of the State Duma (lower house) and the Federation Council (upper house).

The political system in Russia and the United States are different. In the US, it is a presidential system where the President is both the head of state and government, while in Russia, the President is the head of state while the Prime Minister is the head of government.

In the US, the Congress is made up of the Senate (upper house) and the House of Representatives (lower house) while in Russia, the Federal Assembly is made up of the State Duma (lower house) and the Federation Council (upper house).

The key distinguishing features between the political systems in Russia and the US include the role of the President, the structure of the legislature, and the nature of the judiciary. In Russia, the President has a lot of power and is able to appoint the Prime Minister and other members of the executive branch.

The judiciary is also less independent compared to that of the US. On the other hand, the US has a more balanced system of power between the three branches of government, with the judiciary being independent of the executive and legislative branches.

The strengths of the political system in Russia include a strong centralized government that is able to make quick decisions and a strong military. However, the lack of political pluralism and the weak judiciary system are key weaknesses of the system.

The US political system has a strong commitment to individual rights and democratic principles. However, the system is often characterized by gridlock and polarization between political parties, leading to slow decision-making and a lack of progress on important issues.

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