Which of the following statements is NOT true about what happens in all chemical reactions? The ways in which atoms are joined together are changed. New atoms are formed as products. The starting substances are called reactants. The bonds of the reactants are broken and new bonds of the products are formed.

Answer:

The specific heat capacity of a substance represents the amount of energy required to raise the temperature of 1 gram of that substance by 1 degree Celsius. A material with a lower specific heat capacity will require less energy to raise its temperature than a material with a higher specific heat capacity.

Therefore, steel is the better conductor of heat because it has a lower specific heat capacity than wood. Steel can transfer heat more quickly than wood due to its lower specific heat capacity.

Explanation:

This will result in the formation of 64.7 grammes of hydrogen chloride gas.

The 22.4 litre of Cl2 C l 2 gas produces 44.8 litre of HCl gas, therefore the 22.4 litre of Cl2 C l 2 gas will make 0.050 litre of HCl gas, or 22.4 44.8 0.050 0.025 litres.

Hydrogen chloride is created when chlorine and hydrogen interact.

H2 + Cl2 → 2HCl

To convert HCl's molar mass to grammes:

Number of moles of H2 = 5.33 x 10²³ / Avogadro's number

= 5.33 x 10²³ / 6.022 x 10²³

= 0.888 moles of H2

Number of moles of HCl = 2 x number of moles of H2

= 2 x 0.888

= 1.776 moles of HCl

Mass of HCl = number of moles of HCl x molar mass of HCl

= 1.776 x 36.46 (molar mass of HCl)

= 64.7 grams of HCl

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The theoretical yield for the reaction is 16.97 g MgO.

The percent yield for the reaction is 70.08%.

Let's calculate the moles of Mg and O2:

Moles of Mg = 10.2 g / 24.31 g/mol = 0.420 mol

Moles of O2 = 10.4 g / 32.00 g/mol = 0.325 mol

The theoretical yield of MgO can be calculated using the moles of Mg:

Moles of MgO = 0.420 mol Mg × (2 mol MgO / 2 mol Mg) × (40.31 g/mol MgO) = 16.97 g

Therefore, the theoretical yield for the reaction is 16.97 g MgO.

To calculate the percent yield, we need to compare the actual yield to the theoretical yield:

Percent yield = (actual yield / theoretical yield) × 100%

Percent yield = (11.9 g / 16.97 g) × 100% = 70.08%

Therefore, the percent yield for the reaction is 70.08%.

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Taking into account the reaction stoichiometry, 71.7376 grams of CO₂ is produced by the complete reaction of 0.2038 moles of xylene.

In first place, the balanced reaction is:

C₈H₁₀ + 10.5 O₂  → 8 CO₂ + 5 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

It can be applied the following rules of three: if by reaction stoichiometry 1 mole of C₈H₁₀ form 352 grams of CO₂, 0.2038 moles of C₈H₁₀ form how much mass of CO₂?

mass of CO₂= (0.2038 moles of C₈H₁₀× 352 grams of CO₂)÷1 mole of C₈H₁₀

mass of CO₂= 71.7376 grams

Finally, 71.7376 grams of CO₂ are formed.

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The number of unpaired electrons present in the ground state of O, O⁻, O⁺,Os, Zr, S, F, Ar are 2, 3, 1, 4, 2,1 and 0 respectively.

An unpaired electron is an electron that does not form part of an electron pair and occupies an atom's orbital single. Each of an atom's three atomic orbitals, designated by the quantum numbers n, l, and m, has the capacity to hold a pair of two electrons with opposing spins. Unpaired electrons are extremely uncommon in chemistry because an object carrying an unpaired electron is typically quite reactive. This is because the production of electron pairs, whether in the form of a chemical bond or as a lone pair, is frequently energetically advantageous.

1)The electrical configuration of a chemical must first be determined in order to calculate the amount of unpaired electrons in the compound.

2)The next step is to set the electrons in their shells and count the unpaired electrons.

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Statements on salinity;

Salinity refers to the measure of the concentration of dissolved salts, such as sodium and chloride ions, in a body of water. It is usually expressed in parts per thousand (ppt) or practical salinity units (PSU).

Salinity can vary in different bodies of water due to factors such as evaporation, precipitation, freshwater input from rivers, and ocean currents.

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Answer:

The digestive system is important to the muscular system because it provides the necessary nutrients and energy required for muscle function and growth. The digestive system breaks down food into smaller molecules such as carbohydrates, proteins, and fats, which are then absorbed into the bloodstream and transported to the muscles. The muscles use these nutrients as fuel for energy during muscle contraction and growth. Additionally, the digestive system helps to eliminate waste products that can impair muscle function, such as lactic acid. Therefore, a healthy digestive system is essential for maintaining optimal muscular function and overall physical performance.

Explanation:

According to the solving the final temperature of the water is 15.317°C.

When heat flows through an area, the temperature changes, either rising or falling. By examining the reaction and determining if it is endothermic or exothermic, it is possible to determine that this alters chemical equilibria towards the products or reactants.

Q lost by gold = Q gained by water

where Q is the heat absorbed or lost, which can be calculated using:

Q = m * c * ΔT

where m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

First, let's calculate the heat lost by the gold:

Q lost by gold = m * c * ΔT

= 45.5 g * 0.129 J/g°C * (80.5°C - 15.0°C)

= 231.1 J

This heat is gained by the water, so:

Q gained by water = 231.1 J

Using the same formula for the water, we can calculate the final temperature:

Q gained by water = m * c * ΔT

231.1 J = 192 g * 4.184 J/g°C * (T - 15.0°C)

T - 15.0°C = 0.317°C

T = 15.0°C + 0.317°C

T = 15.317°C

the final temperature of the water is 15.317°C.

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Answer:

Photosynthesis produces glucose, then cellular respiration uses it to make energy along with carbon dioxide. The energy from the glucose is conserved because it doesn't get destroyed

Answer:

Photosynthesis produces glucose, then cellular respiration uses it to make energy along with carbon dioxide. The energy from the glucose is conserved because it doesn't get destroyed.

When both I2 и OCl2 are present in 0.15 mol/L at the beginning of the experiment, the starting rate is roughly 0.004 M/s.

An experiment is described as "a test under controlled circumstances that is made to explain a known truth, to examine the validity of a theory, or even to determine the efficacy from something yet untried" on the inside of the American Heritage Dictionary on the English Language.

If you sprinkle a plant with water, will it grow more effectively? Compare the plant's development before and after spraying it to get a sense of how it is developing without it.

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Answer:

Once upon a time, there was a carbon molecule named Carl. Carl was part of a larger molecule called carbon dioxide, which was constantly moving and shifting around in the air.

One day, Carl was breathed in by a plant. The plant used the carbon in Carl's molecule to create energy through a process called photosynthesis. Carl became a part of the plant, helping it to grow and thrive.

Over time, the plant continued to grow and eventually became a tree. Carl's molecule was now a part of the tree, where it helped to create wood and other plant materials.

As the tree grew older, it eventually fell to the ground and began to decompose. Carl's molecule was released back into the air as carbon dioxide, where it joined other carbon molecules in the atmosphere.

Over time, Carl's molecule was breathed in by animals, used in photosynthesis by plants, and released back into the air as part of the natural carbon cycle. Despite the many twists and turns of its journey, Carl's molecule continued to play an important role in the cycle of life on Earth.

Explanation:

At equilibrium, the pressure of each component in the reaction must be equal to the partial pressure of the component (pH2S = 0.225 atm, pH2 = pS = 0.819 x 0.225 atm = 0.182975 atm).

Equilibrium is a state of balance between opposing forces. It refers to a state in which opposing forces or influences are balanced and in equilibrium with one another. This idea is used in many different areas, from economics to physics. In economics, equilibrium is a state in which market supply and demand are balanced and in relative stability, and prices remain relatively constant. In physics, equilibrium is a state in which all forces acting on a body cancel each other out, leading to a state of rest or motionlessness. In both cases, equilibrium represents a stable state, and any changes to the system will disrupt it.

The total pressure in the container at equilibrium is then equal to the sum of the partial pressures of each component, which is 0.225 + 0.182975 + 0.182975 = 0.59095 atm.

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The least point in this diagram, A, is where a cart pulling a brick is being dragged up an inclined surface.

This energy can be utilized later to move an item since it can be stored and utilized at a later time. Gravitational Three things affect potential energy: mass, gravity, and elevation. These three variables are directly inversely related to energy.

Potentially energy is a type of energy that depends on how various system elements interact with one another. A spring's potential energy rises when it is compressed or stretched. A steel ball has more potential energy if it is raised just above earth as opposed to dropping to it.

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Answer:

The intermolecular forces increase in the following order:

C2H6 < CH4 < CH3F < NH3

The reasoning behind this order is as follows:

C2H6 (ethane) is a nonpolar molecule with only dispersion forces, which are the weakest intermolecular forces.

CH4 (methane) is also nonpolar and only has dispersion forces, but it has a slightly larger molecular weight than ethane, which leads to stronger dispersion forces.

CH3F (fluoromethane) is polar and has dipole-dipole forces in addition to dispersion forces. The dipole-dipole forces are stronger than the dispersion forces in this case.

NH3 (ammonia) is also polar and has hydrogen bonding, which is a stronger type of dipole-dipole force.

Explanation:

Answer:

we can use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we can find the total number of moles of gas in the container:

n(total) = n(A) + n(B)

To find the number of moles of each gas, we can use the partial pressures and the total pressure:

P(A) / P(total) = n(A) / n(total)

P(B) / P(total) = n(B) / n(total)

We can rearrange these equations to solve for n(A) and n(B):

n(A) = P(A) / P(total) × n(total)

n(B) = P(B) / P(total) × n(total)

We know that the partial pressures of gas A and gas B are 0.264 atm and 0.548 atm, respectively, and we can find the total pressure by adding these partial pressures:

P(total) = P(A) + P(B) = 0.264 atm + 0.548 atm = 0.812 atm

We can also find the total number of moles of gas in the container:

n(total) = PV / RT = (0.812 atm) × (9.10 L) / (0.08206 L·atm/mol·K × 316 K) = 0.286 mol

Now we can add 0.130 mol of a third gas, which gives us a new total number of moles of gas:

n(new) = n(total) + 0.130 mol = 0.286 mol + 0.130 mol = 0.416 mol

Since there is no change in volume or temperature, the new total pressure will be proportional to the total number of moles of gas:

P(new) = P(total) × n(new) / n(total) = (0.812 atm) × (0.416 mol) / (0.286 mol) = 1.18 atm

Therefore, the total pressure will become 1.18 atm.

The amount of heat required to convert 94 g of ice at -31◦C to steam at 143.6◦C is 2.32 kJ.

Amount is a monetary measurement of value. It is a numerical value assigned to goods, services, and other transactions that indicate their worth in a currency. Amounts are used to quantify the size of a purchase or sale, and to determine the cost or value of an item. Amounts are also used to track debts, credits, investments, and other financial transactions.

This can be calculated using the formula for heat, Q = mCΔT, where m is the mass of the object, C is the specific heat capacity, and ΔT is the change in temperature. In this case, m is 94 g, C is 4.184 J/g · ◦C for water, and ΔT = 174.6◦C. Therefore, Q = 94 × 4.184 × 174.6 = 2.32 kJ.

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5-chloro-4-methyl-2-nonyne is an organic compound with the molecular formula C11H19Cl. It belongs to the class of alkynes, which are hydrocarbons that contain at least one triple bond between two carbon atoms.

The name of the compound indicates that it has a chlorine atom (denoted by "chloro") attached to the fifth carbon atom of the carbon chain, a methyl group (-CH3) attached to the fourth carbon atom, and a triple bond between the second and third carbon atoms of the carbon chain. The carbon chain contains a total of nine carbon atoms (denoted by "nonyne" indicating nine carbons).

The structural formula of 5-chloro-4-methyl-2-nonyne can be written as:

CH3-C≡C-C(CH2)6-Cl

where the triple bond is represented by a "≡" symbol, and the carbon atoms are numbered according to the naming convention.

Answer:

it's an organic compound

Answer:

Burning of wood is chemical change

Dry ice into Carbon dioxide conversion is physical change.

Explanation:

Because when wood is burnt it cannot be recovered back by tthe ashes. So it is chemical change.

Dry ice conversion into Carbon dioxide is a physical change because the chemical composition remains same.

Answer:

wood = chemical

dry ice = physical

Explanation:

In the given options, there are some characteristics of behavior is given. The one which is not the characteristic of a behavior is "it can be recorded", b is correct.

There are some actions and manners that are shown by humans or animals. It is induced by stimuli or inputs from the environment whether internal or external, conscious or subconscious, overt or covert, and voluntary or involuntary. For example -

When suddenly a person meets his or her relative then how that person reacts, whether he or she shows good manners or ignore them is part of their behavior.

Therefore, in the given options, there are some characteristics of behavior is given. The one which is not the characteristic of a behavior is "it can be recorded", b is correct.

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Blank verse is not a characteristic of a sonnet.

Blank verse is not a characteristic of a sonnet. Sonnets are typically written in iambic pentameter and have 14 lines, and the rhyme scheme varies depending on the type of sonnet. For example, the Shakespearean sonnet typically has the rhyme scheme ABAB CDCD EFEF GG, while the Petrarchan sonnet has the rhyme scheme ABBAABBA CDCDCD or ABBAABBA CDECDE. Blank verse, on the other hand, is unrhymed iambic pentameter and is typically used in longer poems or plays.

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Answer:

0.509 (to 3dp)

Explanation:

The formula for moles is:

moles = mass ÷ molar mass

The molar mass of NaCl can be calculated by adding the relative atomic masses of each element in the compound, which you can find in a periodic table:

molar mass = 23.0 + 35.5 = 58.5

Now, we can find the number of moles of NaCl in 29.8g:

moles = 29.8 ÷ 58.5 = 0.509 (to 3dp)

 Answer:
It is exothermic because heat needs to be released by the reactants to form the products.

Answer:

1. The total masses of the products (hydrogen and oxygen gases) is equal to the mass of the water that was decomposed.

2. The number of atoms of each element in the reactants is equal to the number of atoms of each element in the products.

3. The total charge of the reactants is equal to the total charge of the products.

Explanation: water.

Answer:

B. The products will contain 4 Cu atoms and 5 H₂O molecules.

Explanation:

the steady state concentration of the drug in the patient's bloodstream is 400 μmol/L.

throughout the body, the blood's flow or motion. Blood travels through blood veins from the heart to the rest of the liver and muscles, tissues, and organs, carrying oxygen, nutrition, and other vital substances.

The rate of drug infusion is given as 20 μmol/h. The rate of drug elimination can be described by first-order kinetics:

d[C]/dt = -k[C]

where [C] is the concentration of the drug in the bloodstream, t is time, and k is the first-order rate constant for drug elimination by the liver.

20 μmol/h = k[C]

Solving for [C]:

[C] = (20 μmol/h) / k

Substituting k = 0.05 h⁻¹ (given in the problem):

[C] = (20 μmol/h) / (0.05 h⁻¹)

= 400 μmol/L

the steady state concentration of the drug in the patient's bloodstream is 400 μmol/L.

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19.5 moles of oxygen will be produced by 13 moles of Al₂O₃.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Moles of Al₂O₃ = 13 moles

From the reaction -

                                           2 Al₂O₃ ⇒ 4Al + 3O₂

2 moles of Al₂O₃ produces 3 moles of O₂

1 mole of Al₂O₃ produces 3 ÷ 2 moles of O₂

1 mole of Al₂O₃ = 1.5 mole of O₂

So, 13 moles of Al₂O₃ = 1.5 × 13 moles of O₂

                                    = 19.5 moles of O₂.

Therefore, 19.5 moles of oxygen will be produced by 13 moles of Al₂O₃.

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Considering the definition of synthesis and decomposition reaction, the reaction 2 HCI → H₂ + Cl₂ is considered as a decomposition reaction.

Synthesis or combination reactions occur when two or more reactants form a single product; heat is usually released (exothermic reaction).

The general form of the equation for this type of reaction is the following:

A + B → AB

In a decomposition reaction, a single substance breaks down, producing two or more different substances. This type of reactions can be considered the inverse of synthesis reactions. Heat is usually needed for the reaction to occur.

The general form of these equations is as follows:

AB → A + B

The reaction 2 HCI → H₂ + Cl₂ is considered as a decomposition reaction because hydrochloric acid molecule breaks down to produce hydrogen gas and chlorine gas.

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The solutions to the above questions on potential and kinetic energy are as follows:

1. 5.774m/s

2. 9702J

3. 0.71kg

4. 114.4kg

5. 135.05kg

Kinetic energy is the energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed i.e. K.E = ½mv²

QUESTION 1:

If an object has 25,000 joules of energy and a mass of 1500kg. The velocity can be calculated as follows:

25000 = ½ × 1500 × v²

v² = 33.3

v = 5.774m/s

QUESTION 2:

How much potential energy does an object have if it is 45 metres up in the air and has a mass of 22kg.

P.E = mgh

P.E = 22 × 9.8 × 45

P.E = 9702J

QUESTION 3:

The mass of an object that is 250m high in the air and has 1750J of energy is

1750 = m × 9.8 × 250

1750 = 2450m

m = 0.71kg

QUESTION 4:

The kinetic energy of an object is 35,750J moving at a velocity of 25m/s. The mass is as follows:

35750 = ½ × m × 25²

35750 = 312.5m

m = 114.4kg

QUESTION 5:

The potential energy of a boulder is 45,000J and is sitting 34m high. The mass of the boulder can be calculated as follows:

45000 = 34 × 9.8 × m

45000 = 333.2m

m = 135.05kg.

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