if an object has a density of 2.5 g/cm3 and it is placed in a tank of water, will the object float or sink in water

Answer:

Yes an atom is a system because,the Bohr or solar system model of the atom states that atoms consist of a nucleus with a number of electrons in orbits around that nucleus, similar to a solar system. People have speculated that perhaps atoms are tiny solar systems.

A chemical  reaction involves the interaction of reactants. The substance X ,must be an acid and in this case is CH3COOH

In chemistry, a reaction is said to occur when substances interact in such a way that other new substances are formed.

Now let us look at the particular reaction; NaOH + X ----> NaCH3COO + H2O. The substance X must be an acid. Hence, the most likely susbstance is CH3COOH.

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Answer: The molarity of the K2CO3 solution is 0.625 M.

Explanation: To find the molarity of a solution, you need to know the moles of solute and the volume of the solution in liters. Here's how to solve the problem:

Calculate the moles of K2CO3 using its given mass and molar mass:

moles = mass / molar mass = 93.1 g / 136.21 g/mol = 0.682 mol

Calculate the volume of the solution in liters:

volume = 1.09 L

Calculate the molarity of the solution using the moles and volume:

molarity = moles / volume = 0.682 mol / 1.09 L = 0.625 M

Answer:

A

Explanation:

Electrolysis has to do with the decomposition of a solution by the passage of direct current through it. Current enters and leaves the electrolyte via electrodes.

The positive electrode is called the anode while the negative electrode is called the cathode. Positive ions move towards the cathode while negative ions move towards the anode.

Cu^2+ moves towards the cathode and accepts two electrons to be deposited on the cathode as metallic copper. Also, Cl^- ions move towards the anode and gives up electrons to become oxidized to chlorine gas.

Hence in the electrolysis of CuCl2, copper is obtained at the cathode while chlorine gas is obtained at the anode. Hence 1 and 3 are correct statements.

The attractive forces between the particles in a liquid determine the equilibrium vapor pressure of the liquid. Explanation: In a liquid, the particles are in constant motion, and they attract each other due to the intermolecular forces. As a result of the attraction forces, a few of the molecules at the surface have enough energy to break free of the liquid's attractive forces and become vapor molecules.

The equilibrium vapor pressure is the pressure exerted by the vapor molecules above the liquid surface in a closed container when the rate of vaporization equals the rate of condensation.

In other words, when the rate of liquid molecules becoming gas is equal to the rate of gas molecules becoming liquid, then a system is said to be at equilibrium.

The liquid will continue to evaporate and condense, but the number of particles in each phase will remain constant in a closed system. The temperature and strength of intermolecular forces in the liquid determine the vapor pressure of a liquid.

Stronger forces will require a higher temperature for evaporation to occur, leading to a lower vapor pressure, while weaker forces will allow for a higher vapor pressure.

Therefore, the stronger the attractive forces between the particles in a liquid, the lower its equilibrium vapor pressure.

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Answer:

2.5×10^20atoms

Explanation:

number of moles= number of particles/Avogadro's constant

number of particles=Avogadro's constant × number of moles

number of particles=(6.02×10^23) × (4.1×10^-4)

number of particles=2.5×10^20

Answer: Pulley or a crane.

Explanation:

Answer:

An inclined plane would have to be too long, and a lever would be impractical. Pulleys are best used to raise objects.

Explanation:

Answer: 0.00048

m

o

l

Explanation:

Moles = Mass/Molar mass

n

=

m

M

r

=

0.0688

107.87

+

35.5

=

0.00048

m

o

l

a. The empirical formula of a 5.000 g sample of an unknown insecticide made up of C, O, and Cl is analyzed by combustion analysis. 8.692 g of CO₂ and 1.142 g of H₂O are recovered. A second 5.000 g sample in another analysis gave 2.571 g of HCl is C₅H₆ClO₃.

b. The molecular formula of the unknown’s molar mass around 354 g/mol is C₂₅H₃₀Cl₆O₁₅.

The empirical formula of a compound can be determined by combustion analysis. Combustion analysis is an experimental technique that determines the elemental composition of a compound. This technique involves burning a known quantity of a substance in excess oxygen and analyzing the products formed. The products of combustion are typically carbon dioxide and water vapor.

The first step in determining the empirical formula of the compound is to determine the masses of carbon, hydrogen, and oxygen present in the sample. Here's how you can do this:

1. Carbon: The mass of carbon dioxide produced in the combustion of the sample is 8.692 g. Carbon dioxide is made up of one carbon atom and two oxygen atoms. Therefore, the mass of carbon present in the sample is:

mass of carbon = (mass of CO₂ × 1 mol CO₂) / (44.01 g CO₂/mol CO₂)

mass of carbon = (8.692 g × 1 mol CO₂) / (44.01 g/mol CO₂)

mass of carbon = 1.707 g

2.Hydrogen: The mass of water produced in the combustion of the sample is 1.142 g. Water is made up of two hydrogen atoms and one oxygen atom. Therefore, the mass of hydrogen present in the sample is:

mass of hydrogen = (mass of H₂O × 2 mol H₂O) / (18.02 g H₂O/mol H₂O)

mass of hydrogen = (1.142 g × 2 mol H₂O) / (18.02 g/mol H₂O)

mass of hydrogen = 0.127 g

3. Oxygen: The mass of oxygen in the sample can be calculated by subtracting the mass of carbon and hydrogen from the total mass of the sample.

mass of oxygen = (mass of sample - mass of carbon - mass of hydrogen)

mass of oxygen = (5.000 g - 1.707 g - 0.127 g)

mass of oxygen = 3.166 g

The next step is to convert the masses of carbon, hydrogen, and oxygen into moles by dividing each mass by its respective molar mass. The molar mass of carbon is 12.01 g/mol, the molar mass of hydrogen is 1.008 g/mol, and the molar mass of oxygen is 16.00 g/mol. The number of moles of each element is as follows:

moles of carbon = 1.707 g / 12.01 g/mol = 0.142 moles

moles of hydrogen = 0.127 g / 1.008 g/mol = 0.126 moles

moles of oxygen = 3.166 g / 16.00 g/mol = 0.198 moles

The final step is to determine the simplest whole-number ratio of the atoms present in the compound. To do this, divide each of the moles by the smallest number of moles (in this case, 0.126 moles):

moles of carbon = 0.142 / 0.126 = 1.13 ≈ 1

moles of hydrogen = 0.126 / 0.126 = 1

moles of oxygen = 0.198 / 0.126 = 1.57 ≈ 2

Therefore, the empirical formula of the unknown insecticide is C₁H₁.57O1 or C₅H₆ClO₃.

The molecular formula of a compound is a multiple of its empirical formula. To find the molecular formula of the compound, you need to know its molar mass. In this case, the molar mass of the unknown insecticide is around 354 g/mol. To find the molecular formula, you need to divide the molar mass by the empirical formula mass (the sum of the atomic masses in the empirical formula).The empirical formula mass of C₅H₆ClO₃ is:

1(12.01) + 1(1.01) + 3(16.00) + 1(35.45) = 154.47 g/mol

The molecular formula mass is 354 g/mol. Therefore, the ratio of the molecular formula mass to the empirical formula mass is:

ratio = molecular formula mass / empirical formula mass

ratio = 354 g/mol / 154.47 g/mol

ratio = 2.29

The molecular formula is the empirical formula multiplied by the ratio. Therefore, the molecular formula of the unknown insecticide is:

C₅H₆ClO₃ × 2.29 = C₂₅H₃₀Cl₆O₁₅

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Answer:It is important to realise that a lot of what we know about the structure of atoms ... This is often how scientific knowledge develops, with one person building on the ... The idea of atoms was invented by two Greek philosophers, Democritus and ... For example, an atomic model represents what the structure of an atom could ...

Explanation:

Answer:

The model dose not move or behave like a real atom.

The model dose not show the true size of an atom.

Explanation:

I had this quiz

The digestive and respiratory systems work together to provide the body with the nutrients and oxygen it needs to function. The digestive system breaks down food into smaller molecules that can be absorbed by the body.

The respiratory system delivers oxygen to the blood, which carries it to the cells throughout the body. The cells use the oxygen to break down the food molecules into energy. The digestive system also produces carbon dioxide as a waste product. The respiratory system removes carbon dioxide from the blood and releases it into the air. In addition to their shared role in providing the body with nutrients and oxygen, the digestive and respiratory systems also work together to protect the body from harmful substances. The digestive system produces digestive enzymes that break down food, but these enzymes can also damage the cells of the digestive tract. The respiratory system produces mucus that traps harmful particles in the air before they can reach the lungs.

The digestive and respiratory systems are two very important systems that work together to keep the body healthy. An example of how the digestive and respiratory systems work together is when the epiglottis, a flap of tissue that covers the trachea when you swallow, prevents food from entering your lungs.

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Answer:

–2400 N

Explanation:

This is a physics question. However, the answer to the question is given below.

We'll begin by converting 36 Km/hr to m/s. This can be obtained as follow:

3.6 Km/hr = 1 m/s

Therefore,

36 Km/hr = 36 Km/hr × 1 m/s / 3.6 km/hr

36 Km/hr = 10 m/s

Thus, 36 Km/hr is equivalent 10 m/s.

Next, we shall determine the acceleration of the car. This can be obtained as follow:

Initial velocity (u) = 10 m/s

Final velocity (v) = 0 m/s

Time (t) = 5 s

Acceleration (a) =?

a = (v – u) / t

a = (0 – 10) / 5

a = – 10 / 5

a = –2 m/s²

Finally, we shall determine the force required to stop the car. This can be obtained as follow:

Mass (m) = 1200 Kg

Acceleration (a) = –2 m/s²

Force (F) =?

F = ma

F = 1200 × –2

F = –2400 N

NOTE: The negative sign indicate that the force is in opposite direction to the motion of the car.

Citric acid is added to food to add tartness and enhance the flavor. The correct option is b.

Citric acid, a natural compound found in citrus fruits, is commonly added to food for its tart flavor and ability to enhance taste. Here's a step-by-step explanation:

1. Tartness: Citric acid is highly acidic and has a sour taste. When added to food, it provides a sharp, tangy flavor that adds tartness. This tartness can help balance the overall taste profile of a dish, especially in sweet or savory recipes.

2. Flavor enhancement: Citric acid acts as a flavor enhancer, intensifying the existing flavors in food. It has the ability to enhance the perception of other taste sensations, such as sweetness and saltiness, making food taste more vibrant and flavorful.

3. Preservation: Citric acid also acts as a natural preservative in some food products. It has antimicrobial properties that inhibit the growth of certain bacteria and fungi, helping to extend the shelf life of foods and prevent spoilage.

4. pH adjustment: Citric acid can be used to adjust the pH level of certain food products. It is commonly used in canning and preserving processes to create an acidic environment that inhibits bacterial growth and helps maintain product quality and safety.

Overall, the addition of citric acid to food primarily serves to enhance flavor, provide tartness, and potentially contribute to preservation. Option b is the correct one.

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Answer:

Radioisotopes, nuclear power process heat and non-stationary power reactors have essential uses across multiple sectors, including consumer products, food and agriculture, industry, medicine and scientific research, transport, and water resources and the environment.

Explanation:

careful it was copied dont want you to get in trouble for copy right :)

The characteristics of nuclear reactions allow to find some uses:

     Fission reactions:

  fusion reactions is development energy production

Nuclear reactions are reactions where atoms are transformed into other atoms, they can be of two types

Let's describe some of the uses of nuclear fission processes.

In conclusion the characteristics of nuclear reactions we can find the uses:

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Answer:

atomic number

Explanation:

isotope is a family of an element with the same atomic number but different mass number.

Balancing redox equations under acidic conditions involves the following steps:

1. Write the unbalanced equation and identify the oxidized and reduced species.
2. Separate the equation into two half-reactions, one for oxidation and one for reduction.
3. Balance the elements other than hydrogen and oxygen in each half-reaction.
4. Balance oxygen by adding water molecules to the side of the equation that needs it.
5. Balance hydrogen by adding H+ ions to the side of the equation that needs it.
6. Balance the charge in each half-reaction by adding electrons to the side of the equation that needs it.
7. Multiply each half-reaction by a coefficient so that the number of electrons gained in the reduction half-reaction equals the number of electrons lost in the oxidation half-reaction.
8. Add the two half-reactions together and cancel out any common terms.
9. Check that the elements, charge, and atoms are balanced on both sides of the equation.

It is important to note that the steps for balancing redox equations under basic conditions are similar, but involve the addition of OH- ions to neutralize H+ ions.

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The thermodynamic quantities ΔH°rxn, ΔS°rxn, and ΔG°rxn for the photosynthesis reaction, we need the standard enthalpy change (∆H°f) and standard entropy change (∆S°f) values for the reactants and products involved.

The balanced equation for photosynthesis is:

6 CO₂(g) + 6 H₂O(l) → C₆H₁₂O₆(aq) + 6 O₂(g)

a) Calculate ΔH°rxn at 15°C:

The standard enthalpy change (∆H°f) values for the reactants and products at 25 °C (298 K) are as follows:

∆H°f [CO₂(g)] = -393.5 kJ/mol

∆H°f [H₂O(l)] = -285.8 kJ/mol

∆H°f [C₆H₁₂O₆(aq)] = -1273.3 kJ/mol

∆H°f [O2(g)] = 0 kJ/mol (oxygen is in its standard state)

Using the stoichiometric cofficients of the balanced equation, we can calculate ∆H°rxn:

∆H°rxn = Σ(n * ∆H°f [products]) - Σ(m * ∆H°f [reactants])

= (1 * -1273.3 kJ/mol) + (6 * 0 kJ/mol) - (6 * -393.5 kJ/mol) - (6 * -285.8 kJ/mol)

= -1273.3 kJ/mol + 0 kJ/mol + 2361 kJ/mol + 1714.8 kJ/mol

= 3802.5 kJ/mol

Therefore, ΔH°rxn at 15°C is 3802.5 kJ/mol.

b) Calculate ΔS°rxn at 15°C:

The standard entropy change (∆S°f) values for the reactants and products at 25 °C (298 K) are as follows:

∆S°f [CO₂(g)] = 213.7 J/(mol·K)

∆S°f [H₂O(l)] = 69.9 J/(mol·K)

∆S°f [C₆H₁₂O₆(aq)] = 212.1 J/(mol·K)

∆S°f [O₂(g)] = 205.0 J/(mol·K)

Using the stoichiometric coefficients of the balanced equation, we can calculate ∆S°rxn:

∆S°rxn = Σ(n * ∆S°f [products]) - Σ(m * ∆S°f [reactants])

= (1 * 212.1 J/(mol·K)) + (6 * 205.0 J/(mol·K)) - (6 * 213.7 J/(mol·K)) - (6 * 69.9 J/(mol·K))

= 212.1 J/(mol·K) + 1230.0 J/(mol·K) - 1282.2 J/(mol·K) - 419.4 J/(mol·K)

= -259.5 J/(mol·K)

Therefore, ΔS°rxn at 15°C is -259.5 J/(mol·K).

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Answer:

w

Explanation:

w

Chemical formula of acetaminophen is C₈H₉NO₂, this drug is also called as paracetamol and is used as a pain killer or an analgesic.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:

I hate to not answer and have you repost this if you could repost it with the choices by clicking the arrow I can figure it out a lot faster and I'll copy and paste to show you that it's right

Explanation:

I'm good with history biology sum math so if you want to do what I asked and reposted I can give you the answers and I will show that they are correct I won't just guess like some people do just to get points cuz I don't care about points I just get on here to help people

Answer: The answer for the blanks is initial appearance and than final appearance.

Explanation:

The jejunum is the longest segment of the small intestine. Option d is correct.

The small intestine is the longest part of the gastrointestinal tract, which is responsible for the absorption of nutrients from the food we eat. It is divided into three parts, namely the duodenum, jejunum, and ileum.

The jejunum is the middle part and the longest segment of the small intestine, which extends from the duodenum to the ileum. It is about 2.5 meters long and is located in the upper abdomen, between the duodenum and the ileum.

The jejunum is responsible for the majority of nutrient absorption, particularly carbohydrates and proteins. Its inner surface has numerous folds called plicae circulares, which increase its surface area for efficient absorption.

Additionally, the walls of the jejunum have numerous finger-like projections called villi, which further increase its surface area. Overall, the jejunum plays a crucial role in the digestive process by absorbing nutrients from the chyme, the partially digested food mixture that enters the small intestine from the stomach.

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When handling the sodium hydroxide solution in this experiment, a safety concern would be to wear lab gloves to protect your skin from the corrosive effects of the hydroxide. Additionally, it is important to use the solution in a fume hood to minimize exposure to harmful vapors.

The safety concern when handling the sodium hydroxide solution used in this experiment would be to wear lab gloves.Sodium hydroxide is a strong base that can cause chemical burns and skin irritation upon contact. It can also cause eye damage and respiratory irritation if inhaled. Therefore, it is important to handle it with care and take proper precautions to avoid any accidents or injuries.Wearing lab gloves is one of the important safety measures when handling sodium hydroxide solution. Lab gloves provide a barrier between the skin and the chemical, reducing the risk of skin irritation or burns. Gloves made of nitrile, neoprene, or other chemical-resistant materials are recommended for handling sodium hydroxide solution.While it is also important to keep sodium hydroxide solution away from open flames and only use it in a fume hood to avoid inhalation of fumes, these precautions are not the primary safety concern when handling the chemical. The most important safety measure is to wear appropriate personal protective equipment, such as lab gloves, to protect against contact with the chemical.

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The given triprotic acid H₃A has pka's of 2.50, 5.75, and 9.25.

The pkb for the base A³⁻ can be calculated using the formula: pka + pkb = 14, where pka is the acid dissociation constant and pkb is the base dissociation constant.

Using this formula, we can first calculate the value of the third pkb as follows:

pka + pkb = 14 ⇒

pkb = 14 - 9.25

= 4.75

Similarly, we can calculate the second pkb:pka + pkb = 14

⇒ pkb

= 14 - 5.75

= 8.25

Now, we can calculate the first pkb:pka + pkb = 14 ⇒ pkb = 14 - 2.5 = 11.5

Therefore, the pkb values for the base A³⁻ are 11.5, 8.25, and 4.75 respectively.

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Answer:

Velocity is the distance traveled during a specific unit of time

Sample A is a mixture. The formation of two separate clear layers when cooled and then disappearing when returned to room temperature indicates that there are two different substances present in the sample. The density of the liquid at 0.77 g/mL also suggests that it may be a mixture as pure substances typically have specific densities.

Sample B is a pure substance. The fact that the same amount of water is needed to dissolve both subsamples in both trials suggests that they are both the same substance. Additionally, the fact that they are both yellow cubes with the same mass further supports the idea that they are a pure substance. The slight variation in the amount of water needed to dissolve the subsamples could be due to variations in the density of the solid cubes or slight differences in the solubility of the subsamples.

Overall, the experiments conducted on both samples suggest that Sample A is a mixture and Sample B is a pure substance.

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Answer:

If you can identify the species that was being oxidized, its species that contains the element on the other side is the reducing agent.

For example, in the equation Zn + Cu2+ --> Zn2+ + Cu, the zinc was oxidized, making Zn the reducing agent.