Show all work: A metal bar has a length of 5.0 cm, a width of 3.0 cm, and a height of 1.0 cm. What volume of water, measured in deciliters, would this bar displace?

Answer:

aaaaahhhhhhhhhhhhhhhhhhhhhhhhhh

Explanation:

Since 1 L of water has 1,000 g, 0.1374 L or 137.4 g of water must be added to 8.27 g of acetic acid.

To make a 0.175 m aqueous acetic acid solution, you should add 8.27 g of acetic acid (HC2H3O2) to sufficient water to make the total solution mass equal to 8.445 g. This is because the molar mass of acetic acid is 60.05 g/mol, so 8.27 g can form a 0.137 m solution. To get this up to 0.175 m, a total mass of 8.445 g must be added, so 0.175 g of water must be added to the 8.27 g of acetic acid.

Making an aqueous acetic acid solution is simply a matter of combining the right amounts of acid and water. The amount of water to be added is easily calculated, since acetic acid has a known molar mass of 60.05 g/mol. The mass of the solution needs to be equal to the mass of the acetic acid plus the additional mass of water.

In this case, 8.27 g of acetic acid must be combined with 0.175 g of water, to produce a 0.175 m aqueous acetic acid solution.

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Answer:

This is because oxygen requires two electrons to gain stability, while hydrogen has only one olectron, therefore two hydrogen atoms are required

Answer:

Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected. Therefore, snow and ice which are covered in soot from pollution no longer reflect sunlight, but absorb it and so melting increases.

Answer:

Half of the solar radiation is absorbed and converted to infrared (heat).

Explanation:

The specific heat capacity of copper metal : 0.390 J/g °C

Given

25 g metal

Δt metal = 18°C

15 g water

Δt water = 2.8 °C

Required

The specific heat capacity of copper metal

Solution

Q out = Q in

Q releases by metal = Q absorbed by water

m.c.Δt metal = m.c.Δt water(c water = 4.184 J/g °C)

25 x c x 18 = 15 x 4.18 x 2.8

c = 0.390  J/g °C

Answer: 1.90834 X 10 ^ 24

Explanation:

Molar mass Na2SO4 = 23x2+ 32+16X4

= 142g/mol

Mass of Na2SO4 = 450g

Moles of Na2SO4 = mass/ molar mass

= 450g/142g/mol = 3.170 mol

Avogadro's number = 6.02X 10 ^ 23/mol

Number of molecules = moles X avogadro's number

= 3.17 X 6.02X 10^ 23 = 1.90834 X 10 ^ 24 molecules

Therefore the number of molecules of Na2SO4 is1.90834 X 10 ^ 24

First, we need to calculate the heat absorbed by the water. Next, we need to use the principle of conservation of energy to calculate the heat released by the pan.

We can use the formula:

Q = m * c * ΔT

We have:

m = 2.0 kg (mass of water)

c = 4.18 kJ/kg·°C (specific heat capacity of water)

ΔT = (63.2°C - 25.0°C) = 38.2°C

Q = (2.0 kg) * (4.18 kJ/kg·°C) * (38.2°C) = 319.22 kJ

Next, we need to use the principle of conservation of energy to calculate the heat released by the pan. We can assume that all the heat released by the pan is absorbed by the water and the calorimeter. We can use the formula:

Q = m * c * ΔT

We have:

m = 3.0 kg (mass of the pan)

c = ? (specific heat capacity of the pan)

ΔT = (300.0°C - 63.2°C) = 236.8°C

Q = 319.22 kJ

Substituting the values, we get:

319.22 kJ = (3.0 kg) * c * (236.8°C)

Solving for c, we get:

c = 319.22 kJ / (3.0 kg * 236.8°C) = 0.449 kJ/kg·°C

The metal that the pan is made of is probably cast iron in this case.

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Answer:

False {final answer}

Explanation:

The statement refers only about chemical change and not about physical change. Physical changes happens when substances undergo a change that does not change their chemical composition.

The phenyl ring is positioned on the exo side of the bicyclic ring.

To determine the position of the phenyl ring in relation to the bicyclic ring, we need to analyze the structure and bonding of the compound. The terms "exo" and "endo" refer to the relative positions of substituents on a bicyclic system.

In a bicyclic system, the exo position refers to the substituents that are located on the outer side of the ring system, while the endo position refers to the substituents that are located on the inner side of the ring system.

By examining the compound's structure and arrangement, we can identify the relative position of the phenyl ring. If the phenyl ring is attached to the outer side of the bicyclic ring, it will be considered in the exo position. On the other hand, if the phenyl ring is attached to the inner side of the bicyclic ring, it will be considered in the endo position.

Without specific information or a detailed description of the compound's structure, it is not possible to determine the exact identity or position of the phenyl ring.

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When diluting a strong acid with water, it is recommended to add the acid to the water and not the other way around. The statement is true.

This is because adding water to the acid can cause a rapid and exothermic reaction, leading to splattering and potential injury.

When the acid is added to the water, the heat generated is absorbed by the water, reducing the potential for splattering. Additionally, adding the acid to water allows for better mixing and reduces the risk of creating concentrated acid pockets that can be dangerous.

Overall, it is important to follow safe laboratory practices when working with acids and to consult with a trained professional if you are unsure about the proper procedures.

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Answer:3835

Explanation: if the answer would be ABCD then it would be 3835.

2+1=A so A=3

A+5=B 3+5=B so B=8

1+C=3 3-1=2 so C=2

2+3=D so D=5

3825

The type of intermolecular forces act between a hydrogen chloride molecule and a chloromethane molecule is dipole dipole interaction.

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The Henderson-Hasselbalch equation is used to calculate the volume of NaOH needed to adjust the pH of a buffer solution. The equation is pH = pKa + log (base/acid). In this case, the pKa of glycolic acid is 3.83.

NaOH is the chemical formula for sodium hydroxide. It is a white, odorless, caustic solid that is highly soluble in water. Sodium hydroxide is used in many industrial and commercial applications, including the manufacture of paper, textiles, soaps, detergents, and drain cleaners. It can also be used to neutralize acids or to raise the pH of a solution. Sodium hydroxide is a strong base, meaning it can accept protons from acids and can be corrosive to some metals. It is also highly reactive with many organic compounds, which can make it a useful industrial chemical.

pH = 9.68

Volume = 19.7 mL

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The NaOH given to the student should weigh 46.3 grams.

The formula units can be calculated as moles multiplied by the Avogadro number.

Avogadro number is, 6.023 × 10^23.

The formula units are given to be 7.03 × 10^23.

Formula units = Avogadro Number × Number of moles

7.03 × 10^23 = 6.023 × 10^23 × Number of moles

Number of moles = (7.03 × 10^23)/(6.033 × 10^23)

Number of moles = 1.16

One mole of NaOH has the mass 39.99 grams.

1.16 moles of NaOH has mass = 1.16 × 39.99 grams.

= 46.38 grams.

Hence, the NaOH should weigh 46.3 grams.

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The study of basic properties and behavior of matter is known as chemistry. It is a branch of natural science that studies everything from the atoms, molecules, and ions that make up a compound to the elements that make up matter:their composition,structure,characteristics, behavior, and what happpens when they interact.

Cooking is essentially a chemistry experiment. It's likely that you'll become a better cook if you comprehend the chemical processes involved in raising baked items, neutralizing acidity, or thickening sauces.  Information on petroleum, product recalls, pollution, the environment, and technological advancements.

Your understanding of the world around you is aided by chemistry. Environmental contamination is without a doubt a major issue on a global scale. But how does it impact Earthly life? Basic chemical knowledge is necessary to comprehend how environmental contamination affects both living things and the atmosphere.

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Answer:

11460

Explanation:

Answer:

B. The reactants are compounds that react to form new compounds (the products).

Explanation:

yessirski what he said is what im doing. Thanks, guys! #BrainlyPremium

Positive catalyst increases the rate of the reaction by providing a shorter path to the reaction to take place while a negative catalyst decreases the rate of the reaction by providing a longer path to the reaction to take place.

Catalysis can be defined as the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst. Catalysts are not consumed in the reaction and remain unchanged after it.

Therefore catalysts speed up a chemical reaction by lowering the amount of energy you need to get one going. Catalysis is the backbone of many industrial processes which use chemical reactions to turn raw materials into useful products.

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A reaction which is exothermic and has an overall increase in entropy is

A) spontaneous only at high T

B) spontaneous only at low T

C) always spontaneous

D) spontaneous in the reverse direction.

The correct option is C) i.e., always spontaneous

Spontaneity is determined by the free energy. When ΔGΔG is negative, it is spontaneous.

ΔG=ΔH−TΔSΔG=ΔH−TΔS

The problem indicates that the ΔSΔS is positive. If the reaction is exothermic, this means that the ΔHΔH is negative.

ΔGΔG is going to be negative no matter the temperature.

A spontaneous process is one that occurs on its own, without any energy input from the outside. For example, a ball will roll down an incline; water will flow downhill; ice will melt into water; radioisotopes will decay, and the iron will rust.

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Answer:

False

Explanation:

Although polymers can be melted at very low temperatures, it is very difficult for polymers to form complex shapes upon cooling. The statement is false.

A polymer is a macromolecule, combination of many subunits, it can be found all around us, In DNA naturally occurring biopolymer are present, polypropylene  used as the plastic.

Polymers naturally found in plants and animals or may be man-made or called as synthetic polymers.

Different polymers have both physical and chemical properties, like the tensile strength increase due to the chain length and increase in cross-linking, do not melt, present in crystalline to semi-crystalline form.

The polymer is formed by hydrogen bonding and ionic bonding resulting in better cross-linking strength, Dipole-dipole bonding side chains is observed which show its high flexibility, Van der Waals forces can also link the chains.

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The orbital period of the asteroid, carried out to 4 significant digits, is approximately 1652.0 years.

To find the orbital period (P) of an asteroid with a given semi-major axis (a), we can use Kepler's third law:

a³ = P²

Given that the semi-major axis (a) is 73.4 AU, we can substitute this value into the equation and solve for the orbital period (P):

(73.4 AU)³ = P²

(73.4)³ AU³ = P²

P² = (73.4)³ AU³

Taking the square root of both sides:

P = sqrt((73.4)³) AU

Using a calculator to evaluate the expression, we find:

P ≈ 1652.0 AU

Therefore, the orbital period of the asteroid, carried out to 4 significant digits, is approximately 1652.0 years.

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Answer:

product

Explanation:

It is the right answer.

Answer:

Laboratory safety rules are important because there can be many dangerous chemicals in a lab.  Safety rules help people stay safe when they are in close contact with these chemicals.  Over the past few years, lab safety rules have prevented many deaths.  It's important to follow these rules because you could get seriously injured if you don't.

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The element first discovered in the Sun's spectrum and then found on Earth 30 years later is helium. In 1868, French astronomer Pierre Janssen and English astronomer Sir Norman Lockyer observed a yellow spectral line in the Sun's light during a solar eclipse.

This line did not correspond to any known element at that time. Lockyer and British chemist Edward Frankland suggested that the line was due to a new element, which they named "helium," after the Greek word for the Sun, "Helios." It was not until 1895, nearly 30 years after its initial discovery in the Sun's spectrum, that helium was found on Earth.

Scottish chemist Sir William Ramsay isolated helium by treating the mineral cleveite with acid. Ramsay's discovery confirmed the existence of helium as an element both in the Sun and on Earth. Helium is the second most abundant element in the universe and has various applications, including as a coolant in medical and scientific equipment, and in lighter-than-air balloons.

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Answer:

When you dissolve sodium chloride (NaCl) in water to make brine, the particles of NaCl separate and disperse uniformly throughout the water. This process is known as dissolution or hydration.

In a crystal of solid NaCl, the sodium (Na+) and chloride (Cl-) ions are arranged in a regular, three-dimensional lattice structure held together by strong ionic bonds. However, when NaCl is placed in water, the polar water molecules surround each ion and weaken the ionic bonds, causing the crystal lattice to break apart. The positive ends of the water molecules (hydrogen atoms) are attracted to the negative chloride ions, while the negative ends of the water molecules (oxygen atoms) are attracted to the positive sodium ions.

As the ionic bonds weaken, individual Na+ and Cl- ions are pulled away from the crystal lattice and surrounded by water molecules, forming hydrated ions. The hydrated ions are now free to move around in the water, which allows them to conduct electricity and gives brine its characteristic electrical conductivity.

Overall, the dissolution of NaCl in water results in the separation of the Na+ and Cl- ions, and their dispersion throughout the water. This process is a physical change, as the chemical identity of the Na+ and Cl- ions remains the same before and after dissolving in water

Answer: The percentage by mass of sulphur in \(Al_2(SO_4)_3\) is 9.36%

Explanation:

Mass percent of an element is the ratio of mass of that element by the total mass expressed in terms of percentage.

\({\text {Mass percentage}}=\frac{\text {mass of sulphur}}{\text {Total mass}}\times 100\%\)

Given: mass of sulphur = 32 g/mol

mass of \(Al_2(SO_4)_3\) = 342 g/mol

Putting in the values we get:

\({\text {Mass percentage}}=\frac{32g/mol}{342g/mol}\times 100\%=9.36\%\)

The percentage by mass of sulphur in \(Al_2(SO_4)_3\) is 9.36%

Taking into account the definition of molarity, the molarity of the solution is 0.78 \(\frac{moles}{liter}\).

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

\(molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{liter}\).

Molarity of a solution of NaNO₃

In this case, you know:

Replacing in the definition of molarity:

\(molarity=\frac{0.078 moles}{0.100 L}\)

Solving:

molarity= 0.78 \(\frac{moles}{liter}\)

Finally, the molarity of the solution is 0.78 \(\frac{moles}{liter}\).

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Answer:

detail is given below.

Explanation:

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O  → C₆H₁₂O₆ + 6O₂

The given equation is balanced chemical equation of photosynthesis. There are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

If equation is not balanced,

CO₂ + H₂O  → C₆H₁₂O₆ + O₂

It can not follow the law of conservation of mass because mass is not equal on both side of equation.

Answer:

3 parts

Explanation:

Eukaryotic cells have 1) a membrane-bound nucleus; 2) numerous membrane-bound organelles and 3) several, rod-shaped chromosomes.