Saturated hydrocarbons whose carbon atoms are arranged in an open chain.

Given :

Energy in one slice of bread , e = 50 kcal .

A 1- lb loaf of bread contains 18 slices .

1 cal = 4.18 J .

To Find :

How many Joules of energy are obtained by eating 1.00 g of bread .

Solution :

We know , 1 lb = 0.45 kg = 450 g .

So , mass of 1 slice bread in gram is :

\(m=\dfrac{450}{18}\\\\m=25 \ g\)

So , 25 g bread contains 50 kcal of energy .

Energy in 1 g of bread is :

\(c=\dfrac{50}{25}\\\\c=2\ kcal\)

Therefore , energy in joules is \(2\times 4.18\ J=8.36\ J\) .

Hence , this is the required solution .

Answer:

You need 0.5 moles of oxygen to burn one mole of Mg.

Explanation:

The balanced reaction is:

2 Mg + O₂ → 2 MgO

When chemical changes occur, the chemical elements are conserved, so the number of atoms is the same before and after the change. To represent this equality of the number of atoms, the expression is "balanced" or "equalized". That's why you put a two in front of the magnesium formula and a two in front of the magnesium oxide to equal the number of atoms involved in the change. These numbers used are called stoichiometric coefficients. The stoichiometric coefficients allow to establish the molar ratio in which the reactants combine and the products are formed.

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

Then you can apply the following rule of three: if by reaction stoichiometry 2 moles of magnesium reacts with , 1 mole of magnesium reacts with how many moles of oxygen?

\(amount of moles of oxygen=\frac{ 1 mole of magnesium*1 mole of oxygen}{ 2 moles of magnesium}\)

amount of moles of oxygen= 0.5 moles

You need 0.5 moles of oxygen to burn one mole of Mg.

Answer:

dendrites in your sensory neurons

Explanation:

Sensory neurons are first activated, then the stimulus is transmitted horizontally between them, spreading perception through the olfactory bulb that captures the smell of a baked cookie.

After this, the axons are activated to transmit to the motor neurons that will carry out the action of walking towards the kitchen.

Answer:

x-10 should be the answer

Answer:

B

Explanation:

The more energy levels that are occupied by electrons, the larger

the atomic radius.

The more energy levels that are occupied by electrons, the larger

the atomic radius. Hence, option B is correct.

The atomic radius is calculated by measuring the distance between the nuclei of two identical atoms bonded together.

In general, the atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remain constant.

Hence, the observed trend in atomic radius as you move down is that the more energy levels that are occupied by electrons, the larger

the atomic radius.

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Answer:

The study of reaction "Rates" is called Chemical "Kinetics.

The situation described can be solved using the combined gas law, which states:

(P1 x V1) / (T1) = (P2 x V2) / (T2)

Where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, respectively. P2, V2, and T2 are the final pressure, volume, and temperature of the gas, respectively.

To solve for the final temperature (T2), we can rearrange the equation as:

T2 = (P2 x V2 x T1) / (P1 x V1)

Let's plug in the given values:

P1 = 700 mm

P2 = 800 mm

V1 = V2 (since the volume is doubled)

T1 = 0°C + 273.15 = 273.15 K (converting to Kelvin)

So, we have:

T2 = (800 mm x 2V1 x 273.15 K) / (700 mm x V1)

T2 = (1600/7) x 273.15 K

T2 = 392.2 K

Therefore, the final temperature at which the volume of gas would be doubled, if the pressure increases from 700-800 mm and the gas is initially at 0°C, is approximately 392.2 Kelvin (which is approximately 119°C or 246°F).

The ionization values belong to the element magnesium (Mg). Ionization values help us determine the amount of energy that will be required to remove one or more electrons from an atom. The third period is where we can locate the element that has these ionization values.

These ionization values are listed in the table given below:Element: Mg (Magnesium)First ionization energy: 738 kJ/molSecond ionization energy: 1450 kJ/molThird ionization energy: 7732.7 kJ/mol

For a neutral atom, the first ionization energy (IE1) is the amount of energy required to remove an electron from the outermost shell. As we move from left to right in a period, the ionization energy increases. In the third period, Mg (magnesium) has first, second, and third ionization energies of 738 kJ/mol, 1450 kJ/mol, and 7732.7 kJ/mol, respectively. Magnesium is a chemical element that has an atomic number of 12. It has two valence electrons and is located in group 2 of the periodic table. Magnesium has a melting point of 1,202°F (650°C) and a boiling point of 1,994°F (1,090°C). It is a silver-white metal that is widely used in the manufacture of alloys and other industrial applications.

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We need the concentrations of hydrogen gas, water vapour, and oxygen gas to proceed further. If these concentrations are provided, we can substitute them into the equations and solve for δG° and Kp.

To calculate δG°, we need to use the equation δG° = -RT ln(Kp), where R is the gas constant and T is the temperature in Kelvin. To calculate Kp, we use the equation Kp = [H2]²/[H2O]²[O2]. By substituting the given values and solving the equations, we can find δG° and Kp.

To calculate δG° for the given equilibrium reaction at 25.00°C, we can use the equation δG° = -RT ln(Kp), where δG° is the standard Gibbs free energy change, R is the gas constant (8.314 J/(mol·K)), and T is the temperature in Kelvin. In this case, we need to convert the temperature from Celsius to Kelvin by adding 273.15 (25.00°C + 273.15 = 298.15 K).

To calculate Kp for the equilibrium reaction 2H2O(g) ⇌ 2H2(g) + O2(g), we can use the equation Kp = [H2]²/[H2O]²[O2]. Here, [H2] represents the concentration of hydrogen gas, [H2O] represents the concentration of water vapour, and [O2] represents the concentration of oxygen gas.

Now, let's substitute the given values into the equations and solve:

δG° = -RT ln(Kp)
= -(8.314 J/(mol·K)) * 298.15 K * ln(Kp)

Kp = [H2]²/[H2O]²[O2]
= ([H2]²) / ([H2O]²[O2])

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Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.

The nucleus is composed of protons and neutrons. We know that the mass of the proton is 1640 times the mass of the electron. The neutron only contributes to the mass of the atom.

Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.

The electron has a negligible mass therefore, the electron does not contribute to the mass of the atom.

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The syringe heated up due to the formation of side product bromobenzene which leads to the whitish appearance.

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³⁷Ca and ⁴₂He is the notation of a radioisotope that is correctly paired with the notation of its emission particle.

Generally, radioisotope is defined as an unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Basically, radioisotopes may occur in nature or be made in a laboratory. Generally, in medicine, they are used in imaging tests and in treatment and it is also called radionuclide.

Generally, uranium is the best known example of a naturally-occurring radioisotope. All but 0.7 per cent of naturally-occurring uranium occurs as uranium-238 while the rest is the less stable, or more radioactive, uranium-235, which has three fewer neutrons in its nucleus.

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The balanced equation

2ABC₃+D⇒D(BC₃)₂+2A​

Given

ABC3+D-D(BC3)2+A​

Required

Balanced equation

Solution

aABC₃+bD⇒D(BC₃)₂+cA​

D, left=b, right=1⇒b=1

B, left=a, right=2⇒a=2

A, left=a, right=c⇒a=c⇒c=2

The equation becomes :

2ABC₃+D⇒D(BC₃)₂+2A​

The value of Ea′ is -53 kJ/mol, and it represents the energy released during the chemical reaction.

The given values ∆E = −33 kJ/mol and Ea = 20 kJ/mol represent the activation energy and the change in energy, respectively, for a chemical reaction. The activation energy, Ea, is the minimum energy required for the reaction to occur, while the change in energy, ∆E, represents the difference between the energy of the reactants and the energy of the products.

The relationship between the activation energy, Ea, and the change in energy, ∆E, can be expressed using the equation: ∆E = Ea + Ea′ where Ea′ represents the energy released during the reaction. Since the change in energy and the activation energy are given, we can rearrange the equation to solve for Ea′: Ea′ = ∆E - Ea

Substituting the given values, we get: Ea′ = −33 kJ/mol - 20 kJ/mol = -53 kJ/mol. Therefore, the value of Ea′ is -53 kJ/mol. This negative value indicates that the reaction is exothermic, meaning that it releases energy as it proceeds. The magnitude of the value (-53 kJ/mol) indicates that the energy released during the reaction is significant.

In summary, the value of Ea′ is -53 kJ/mol, and it represents the energy released during the chemical reaction. This value can be calculated using the equation Ea′ = ∆E - Ea, where ∆E is the change in energy and Ea is the activation energy.

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Atomic mass is the sum of the total number of protons and neutrons in an atom, while atomic number is the number of protons in the nucleus of an atom.

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Answer:

The answer is B

Explanation:

That's what the person above said.

The formulae of the metal according to the law of multiple proportions are XCl₂ and XCl₃, and X is Fe so FeCl₂ and FeCl₃

We have the two chlorides that are XyClw and XyClz. We have to show that the ratios w to z are in small whole numbers.

Compound A = 12.7 g X and 7.1 g Cl, then X must be 5.56 g

Compound B = 16.3 g X and 10.7 g Cl, then X must be 5.56 g.

7.1 x (12.7/16.3) = 5.53 g Cl for each gram of X

10.7 x (12/7/16.3) = 8.34 g Cl for each gram of X. Then what is the ratio of the two Cl numbers: Now, divide both numbers by the smaller one. That is

5.53/5.53 = 1.00

8.34/5.53 = 1.508.

Rounding off 1.508 to 1.50, then you can see that 1.0 to 1.5 is actually 2 to 3 and those are small whole numbers. Within experimental error, the law of multiple proportions is proved to be true.

The compounds must be XCl₂ and XCl₃, and X is Fe so FeCl₂ and FeCl₃ are the compounds.

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Answer:

Half of Earth’s oceans are not owned by any particular country.

Explanation:

Reducing oil pollution requires an international effort because ocean waters do not have boundaries and there are certain portion of the ocean that are not owned by any nation.

International collaborations are sought to combat any issue of oil spillage due to global undertone to it.

A. An antibody could be used to detect toxin D in the cultures described in the passage.

Antibodies are proteins produced by the immune system that can specifically bind to and detect foreign substances, such as toxins, in a sample. By using an antibody specific for toxin D, you can detect its presence in the cultures. In contrast, phospholipids (B) are components of cell membranes and do not have toxin-detection capabilities. Radiolabeled thymine (C) is used for DNA labeling and would not be helpful in detecting toxins. Finally, antigens (D) are the substances that antibodies bind to, and while toxin D itself could be considered an antigen, using an antigen would not be helpful for detecting it in the cultures.

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Explanation:

'Z' would be compounds ....like ' chemical compounds'  made up of elements

Answer:D. Compound.

Explanation:

A compound is defined as a pure substance: formed when two or more elements chemically combine to form bonds between their atoms.

When 200 mL of 2.0 M NaOH(aq) is added to 500 mL of 1.0 M HCl(aq), the pH of the resulting mixture can be determined by first calculating moles of each reactant then finding concentration of excess reactant in final solution.  pH of resulting mixture is closest to 0.84.

First, find the moles of NaOH and HCl: NaOH moles = Volume (L) × Concentration (M) = 0.2 L × 2.0 M = 0.4 moles
HCl moles = 0.5 L × 1.0 M = 0.5 moles. The balanced chemical equation for this reaction is: NaOH + HCl → NaCl + H₂O

From the equation, it is evident that the reaction occurs in a 1:1 ratio. Since there are fewer moles of NaOH, it will react completely with HCl, consuming 0.4 moles of HCl. The remaining moles of HCl are 0.5 - 0.4 = 0.1 moles.

Next, calculate the concentration of the excess HCl in the final mixture: Final Volume = 200 mL + 500 mL = 700 mL = 0.7 L [HCl] = moles of HCl / Final Volume = 0.1 moles / 0.7 L ≈ 0.143 M. Now, you can use the formula pH = -log10[H+], where [H+] is the concentration of H+ ions, which is equal to the concentration of HCl in this case.

pH = -log10(0.143) ≈ 0.84, So, the pH of the resulting mixture is closest to 0.84.

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Answer:

convection occurs in the inner core and crust

Heat transfers due to the flow of a heated fluid like air and water are called convection.

It happens in a circular motion when the air or water is warm. The lighter and fast-moving particles of warm liquid make them rise, while in cooler substances it falls.

The correct answer is:

Option C. Convection occurs in the inner core and crust.

The explanation for this is:

Therefore convection occurs in the inner core and crust.

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Answer:

1)physical change

Explanation:

2)chemical change

The pairs of conditions that need to construct a similar cell that generates the lowest cell potential is [Zn2+]=0.5M and [Fe2+]=1M because Q<1. The correct answer is option A,

In order to construct a similar cell that generates the lowest cell potential, we need to consider the Nernst equation.

Where,

Ecell=E°cell − (0.0592/n) log Q

Where,

E°cell = Standard electrode potential

n = Number of electrons exchanged

Q = Reaction Quotient = [products]/[reactants]

For the given reaction, the cell potential is +0.32 V. This implies that under standard conditions, Q = 1.The answer to the given question is that [Zn2+] = 0.5 M and [Fe2+] = 1 M because Q < 1.

The conditions under which the standard electrode potential of a half-cell is measured are referred to as standard conditions. This usually entails a concentration of 1.00 mol/L for all substances, an atmospheric pressure of 1.00 atm, and a temperature of 25°C.

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The two emissions scenarios that most closely represent the current trend in CO2 emissions are the Representative Concentration Pathway (RCP) 4.5 and RCP 6.0 scenarios. RCP 4.5 assumes moderate emission reduction efforts, while RCP 6.0 represents a higher emission trajectory, reflecting the current trend where emissions reductions are not keeping pace with necessary targets.

The Representative Concentration Pathways (RCPs) are scenarios used to assess the potential impacts of greenhouse gas emissions on the climate system. RCP 4.5 assumes a moderate emission reduction pathway, with emissions peaking around 2040 and declining gradually. On the other hand, RCP 6.0 represents a higher emission trajectory, with emissions peaking later and declining more slowly compared to RCP 4.5. This scenario aligns with the current trend of rising CO2 emissions, indicating that global efforts to reduce emissions have not been sufficient. The current trend is closer to RCP 6.0, highlighting the challenges of achieving widespread emission reductions in various sectors of the global economy.

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Answer:

i think it might be separation by density

Explanation:

Answer:

B: Sort by density

Btw im not copying the person above me. I am 98% Sure its density

Answer:

Energy is converted in a hydroelectric plant as follows;

The kinetic energy of water turns turbines; the mechanical energy of the turbines turns the generator, which produces electrical energy

Explanation:

The water in an hydroelectric plant is given potential energy by building an artificial dam to raise the height of the water above the turbine

The high potential energy of the water is converted to kinetic energy which provides the power that turns the turbine transforming the kinetic energy of the water into rotational kinetic energy of the turbine by conservation of mechanical energy;

The shaft connected between the turbine and the generator, turns the generator by the mechanical energy of the turbine and as the generator turns in a magnetic field, electricity is produced by magnetic induction according to Faraday's law.

299.7g of H2O will be produced.

1st) With the balanced chemical equation and the molar mass of CH4 and H2O, we can calculate the amount of H2O that is produced by stoichiometry:

- CH4 molar mass: 16g/mol

- H2O molar mass: 18g/mol

According to the balanced equation, 16g of CH4 will produce 36g of H2O (2 x 18g).

2nd) Now, with a mathematical rule of three we can calculate the grams of water that will be produced from 133.2 grams of CH4:

Finally, 299.7g of H2O will be produced from 133.2 grams of CH4.