I need help please!!!

When EROEI (Energy Return on Energy Investment) is equal to 1, it means that the energy gained from a particular source is equivalent to the energy invested in obtaining that energy. In other words, the energy return is equal to the energy input. This indicates a situation where the energy extraction process is barely breaking even, with no net gain or loss in energy.

EROEI is a metric used to assess the efficiency and viability of energy sources. It measures the amount of usable energy obtained from a particular energy source divided by the amount of energy invested to extract or produce that energy. A value of 1 means that the energy gained is just enough to offset the energy invested.

In practical terms, an EROEI of 1 implies that the energy source being evaluated is not very efficient. It suggests that the amount of energy required to extract, process, or produce the energy is nearly equal to the energy obtained. Therefore, there is little to no surplus energy available for other uses or to sustain the energy extraction process itself.

An EROEI of 1 is often associated with energy sources in their early stages of development or exploration, where the technology or extraction methods may not be fully optimized. It could also indicate energy sources with high production costs or low energy density.

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Rutherford said that the atom is mostly empty space, with a small, dense positively charged nucleus located at the center.

Ernest Rutherford conducted the famous gold foil experiment, which involved bombarding a thin sheet of gold with alpha particles. He observed that most of the alpha particles passed straight through the gold foil, but some were deflected at angles, and a few bounced back in the direction they came from.

This led him to conclude that the atom was mostly empty space, with a small, dense nucleus at the center that was positively charged and contained most of the atom's mass. The negatively charged electrons were located in the space surrounding the nucleus, but they were much smaller and lighter than the nucleus itself.

In conclusion, Rutherford's discovery of the atomic nucleus revolutionized our understanding of the structure of the atom. It provided a more accurate picture of the atom than the previous plum pudding model, which suggested that the atom was a uniform blob of positive charge with electrons embedded throughout. Rutherford's model showed that the atom was a complex structure with a small, but incredibly dense nucleus at its center, surrounded by electrons in a cloud-like arrangement.

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Answer:

examples include ice cubes in a drink, sand and water, and salt and oil.

Answer:

its b beacuse different things have different mass

The tension acting on the box is 504 N.

Mass of the box A, m₁ = 45 kg

Mass of the box B, m₂ = 60 kg

Acceleration of the system, a = 1.4 m/s²

From, the figure, the forces acting on the blocks can be written as,

m₂g - T = m₂a   ------eqn 1

T - m₁g = m₁a    ------eqn 2

The magnitude of tension can be calculated by solving any of these equations. So, considering the first equation,

m₂g - T = m₂a

Therefore, the tension acting on the box,

T = m₂g -m₂a

T = m₂(g - a)

Applying the values of m₂, g and a,

T = 60 x (9.8 - 1.4)

T = 60 x 8.4

T = 504 N

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Answer:

Explanation:

To calculate the amount of energy removed from 10.55 kg of water to lower its temperature from 22.5 °C to 3.0 °C, we can use the formula:

Q = m * c * ΔT

where Q is the amount of energy in joules, m is the mass of water in kilograms, c is the specific heat capacity of water (4.184 J/g-K), and ΔT is the change in temperature in degrees Celsius.

First, we need to convert the mass of water from kilograms to grams:

m = 10.55 kg * 1000 g/kg = 10550 g

Next, we need to calculate the change in temperature:

ΔT = 3.0 °C - 22.5 °C = -19.5 °C

Note that we have a negative temperature change because the water is losing heat.

Now, we can plug in the values into the formula:

Q = m * c * ΔT = 10550 g * 4.184 J/g-K * (-19.5 °C) = -820,026 J

The negative sign indicates that energy is being removed from the water, which is consistent with the fact that the temperature is decreasing. Therefore, approximately 820,026 joules of energy are removed from 10.55 kg of water to lower the temperature from 22.5 °C to 3.0 °C.

One example of particles that can be drawn closer to occupy a smaller volume is a gas.

In the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.

Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.

By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.

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Answer:

mass of iron in grams  = 1.493×\(10^{-23}\) g

Explanation:

Since one mole of anything is equal to 6.022×\(10^{23}\) of that thing, we can apply that to atoms as well. 1 mol of iron = 55.85g. i.e. the molar mass of iron = 55.85g/mol.

To find the number of moles present, we can divide the number of atoms by the number of atoms in 1 mole, i.e Avogadro's Constant (6.022×\(10^{23}\)).

\(\frac{N}{N_{A}} = n\)

∴ n(Fe) = 502/6.022×\(10^{23}\) = 8.3361×\(10^{-22}\) mol of iron

Finally, to find the mass of iron present, we can divide the number of moles by the molar mass.

\(\frac{n}{M}} = m\)

∴ m(Fe) = 8.3361×\(10^{-22}\)/55.85 = 1.493×\(10^{-23}\) g. (4 sig. fig.)

Two observations about  are;

Water  can be moved  from the roots to the leaves  with the help of the xylem vessels which is been one through proces of transpiration as a result of the evaporation of water from the leaves whereby Glucose is been delived as a result of  photosynthesis in the leaves  and can move t oter part with phloem vessels.

Xylem vessels and phloem tubes, respectively, carry carbohydrates and water. Given that these two channels are hydraulically linked, it is reasonable to assume that the physiological coupling between the two transport systems exists.

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Answer:

The answer is B

Explanation:

A pipe to the ground

Components that are typically included when citing a journal article are, volume or issue number, author(s), name of journal, page number(s), year of publication are typically included when citing a journal article. The correct choices are a, b, c, d, e.

The abstract, comments, and conclusions may or may not be included depending on the citation style and the specific requirements of the report. When citing a journal article in a laboratory report, it is important to include certain components to provide enough information for the reader to locate the article.

The name of the journal in which the article was published should be included, as well as the volume and issue number (if applicable) and the page numbers of the article within the journal. This information helps to identify the specific article within the publication. The author or authors of the article should also be included, typically in the format of last name followed by initials. The year of publication is also important information to include.

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The compound that acts as an antacid in small doses but as a laxative in larger doses is Mg(OH)₂, also known as magnesium hydroxide.

When taken in small amounts, it neutralizes excess stomach acid and relieves symptoms of heartburn and indigestion. However, when taken in larger doses, it can have a laxative effect by drawing water into the intestines and increasing bowel movements. This is why magnesium hydroxide is commonly found in over-the-counter laxatives and stool softeners.

It's important to follow recommended dosages when taking antacids and laxatives to avoid any adverse effects. In addition, prolonged use of magnesium hydroxide can lead to a buildup of magnesium in the body, which can cause diarrhea, nausea, and other digestive issues.

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Answer:

Difference in temperature.

Explanation:

Conduction is the movement of heat energy through a substance or from one substance to another by direct contact of atoms and molecules. Heat moves directly from one molecule to another. The heat energy speeds up the movement of the atoms and they collide with other molecules setting them into faster motion.

A lot of energy is required to overcome these forces and melt or vaporize the alkane

The melting point and boiling point of alkanes (a type of hydrocarbon with only single bonds between the carbon atoms) generally increase as the number of carbon atoms in the molecule increases. This is because the larger the molecule, the more Van der Waals forces (also known as London dispersion forces) that are present. These forces are a type of weak attractive force that can exist between any two molecules and are caused by the fluctuating dipoles (temporary separations of positive and negative charge) that occur within a molecule. The more carbon atoms a molecule has, the more fluctuating dipoles it has, and the stronger the Van der Waals forces are. As a result, more energy is required to overcome these forces and melt or vaporize the substance.

In addition to the size of the molecule, the type of bond present in the molecule can also affect the melting point and boiling point. Single bonds, like those found in alkanes, are weaker than double bonds or triple bonds. As a result, molecules with double or triple bonds have higher melting points and boiling points than molecules with the same number of carbon atoms but only single bonds.

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Answer:

B has highest stability

Explanation:

as its octet is complete

plz mark brainliest if it helps

The number of moles of gas is the same on both sides, the change in volume will not affect the equilibrium position of the reaction. The answer is B) There is no change because there are the same number of moles of gas on both sides.

To determine the change that will occur when the container is shrunk from 9.0 L to 3.0 L for the given reaction:

51.8 kJ + H₂(g) + I₂(g) → 2HI(g)

We need to consider the number of moles of gas on each side of the reaction.

On the left side, there are 2 moles of gas (H₂ and I₂), while on the right side, there are 2 moles of gas (2HI). Both sides have an equal number of moles of gas.

Therefore, the correct answer is B) There is no change because there are the same number of moles of gas on both sides.

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Answer:

5

Explanation:

Temperature calculates heat/the temperature in the specific location.

A new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu. the atomic weight is 40.50 g/mol. Option C. the isotope at 40.0 amu is less abundant.

An atomic weight is the weighted average of the masses of the isotopes of an element, taking into account their relative abundances. If a new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu, and its atomic weight is 40.50 g/mol, it can be deduced that the isotope with the mass of 40.0 amu is less abundant. This is because the atomic weight of an element is the average of the masses of its isotopes, and if the atomic weight is close to the mass of the isotope with a mass of 40.0 amu, then it must be relatively more abundant. The isotope with the mass of 42.0 amu, on the other hand, must be relatively less abundant, hence option c is true.

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Complete Question:

A new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu. the atomic weight is 40.50 g/mol. pick the true statement

A. The isotope at 42.0 amu is less abundant

B. The element has 19 protons and 21 neutrons

C. The isotope at 40.0 amu is less abundant

D. Both isotopes are equally abundant

E. The element has 20 protons and 21 electrons

F. There is not enough information given

g. The element is calcium

Our teeth do not fizz when we drink water because water itself is a neutral substance and does not cause a chemical reaction with the enamel of our teeth. Fizzing or effervescence typically occurs when an acidic substance reacts with a base, releasing carbon dioxide gas.

The enamel of our teeth is primarily composed of calcium phosphate, which is a mineral compound. Calcium phosphate provides strength and durability to our teeth, protecting them from decay and damage. It forms a hard, protective layer over the underlying dentin and pulp.

When we consume acidic beverages or foods, such as carbonated drinks or citrus fruits, the acids present in these substances can react with the calcium phosphate in the enamel. This reaction can lead to the erosion of the enamel and the release of carbon dioxide gas, resulting in a fizzing sensation.

However, when we drink water, which is neutral with a pH close to 7, there is no acidic component that can react with the calcium phosphate in our teeth. Water does not contain acids that can erode the enamel or cause a chemical reaction. Therefore, there is no fizzing or effervescence observed when we consume water.

It is important to note that while water itself does not cause fizzing, certain types of water, such as carbonated or sparkling water, can be acidic due to the dissolved carbon dioxide gas. In such cases, the carbonation can potentially react with the enamel and lead to fizzing or erosion. Regular consumption of acidic or sugary beverages can contribute to tooth decay and should be balanced with proper dental hygiene practices, including regular brushing and flossing.

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Answer:

See below.  

Explanation:

1. Newton's first law

(a) Problem 1

What is the net force required to keep a 500 kg object moving with a constant velocity of 10 m·s?

Answer: None.

Explanation: An object in motion stays in motion unless a net force acts on it.

The object will keep moving at 10 m/s.

(b) Problem 2

A force of 20 N acts on a 10 kg object from the left. A force of 30 N acts on it from the right. What is the net force required to keep the object moving with a constant velocity of 10 m/s?

Answer: 20 N

Explanation:  

The net force is

30 N - 20 N = 10 N

You must apply another 10 N from the left. The net force is then:  

30 N - 30 N = 0

If there is no net force, the object will keep moving at 10 m/s.

2. Newton's second law

(a) Problem 1

What is the net force needed to accelerate an object at a constant 5 m·s⁻²?

Answer: 5 N

Explanation:

F = ma = 1 kg × 5 m·s⁻² = 5 kg·m·s⁻² = 5 N

(a) Problem 2

A net force of 2 N acts on a 1 kg object.  What is the magnitude and direction of the acceleration?

Answer: 2 m·s⁻²

Explanation:

F = ma

2 N = 1 kg × a

a = (2 N)/(1 kg) = (2 kg·m·s⁻²\1 kg) = 2 m·s⁻²

The direction of the acceleration is the same as that of the applied force.

2. Newton's third law

(a) Problem 1

A person with a mass of 58 kg is standing near you. Diagram and calculate the opposing forces.

Answer: 570 N up and down

Explanation:

See Fig. 1.  The person's mass exerts a downward force on the floor.

F = mg, where g is the acceleration due to Earth's gravity

F = 58 kg × 9.8 m·s⁻² = 570 kg·m·s⁻² = 570 N

The floor exerts an upward force of 570 N.

(a) Problem 2

A teacher (mass 65 kg) pushes a cart (mass = 12 kg) of equipment (mass = 7 kg). Her foot applies a force of 150 N backward on the floor against a frictional force of 24 N. Diagram the opposing forces and calculate the net force available to move the cart.

Answer: 126 N

Explanation:

See Fig. 2 below. The teacher's mass exerts a downward force W on the floor, which exerts an equal reaction force R upward. The cart and equipment also exert a downward force on the floor, which exerts the same force upward. We can ignore these forces because they do not contribute to forward motion.

The teacher's foot exerts a backward force of 150 N on the floor, which exerts an equal force forward. However, a frictional force of 24 N opposes the forward force.

The net external force is the force of the floor minus the opposing frictional force. Thus,

F = 150 N − 24 N = 126 N

Answer:

true

Explanation:

Answer:

Ok so I assume they gave u a reaction before asking this question. Look at that reaction and try to figure out what substances are changing in valency, if there is a substance(s) that doesn't change its valency then it's a spectator ion.

The balloon's new volume is 24.6L. An arctic weather balloon being inflated using 24.6 litres of helium gas in a prep shed. The shed is seven degrees Celsius inside.

When the balloon is hauled outside, it is seven degrees Celsius outside. Any three-dimensional solid's volume is equal to how much room it occupies. One of these solids can be a cube, a cuboid, a cone, a cylinder, or a sphere. Chemical compounds are composed of a large number of comparable molecules (or molecular entities), which are composed of atoms from various elements bonded together by chemical bonds. Because of this, a molecule composed of atoms from a single element is not a compound.

v1/t1 = v2/t2

24.6/7 = v2/7

v2 = 24.6L

v1 = v2

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The melting point of polymers increases as the cross linking increases due to addition of covalent bonds in the polymerization process.

The reactions in which large number of monomer molecules react to form polymer are called polymerization reactions.The large molecules which are produced from polymerization may have linear or branched structure.

They can also form a complex three dimensional structure . There are different polymerization reactions like step-growth polymerization, chain -growth polymerization and condensation polymerization.

Polymers containing same kind of monomer are homopolymer and which contain different monomers are heteropolymers. Mechanisms which describe formation of polymers are of different types such as free radical mechanism and chain growth mechanisms.

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Answer:

Chemical energy

Explanation:

The energy stored in the bonds of atoms and molecules, is chemical energy .

Stay safe stay healthy and blessed.

Have a great day !

Thank you

Answer: Chemical energy. :]

Explanation:

Answer:

A. Ernest Rutherford

B.Bohr

C. Eugen Goldstein

D.. Santiago Ramon y cajal

E.john Dalton

F.isobars - a line drawn on a weather map connecting points of equal pressure is called isobars.

example.. argon 40

potassium 40

.two differences between isobars and isotopes.

isobars are those elements which have different atomic number but the same mass number. while isotopes are those elements having the same atomic number and different mass number..

two uses of isotopes.

uranium 235 - for nuclear fission and as fuel in unclear reactors.

# an isotope cobalt - used In the treatment for cancer

# an isotope iodine - used in treatment of goiter.

The alkene that would give only a ketone with three carbons as a product of oxidative cleavage is propene.

Oxidative cleavage of alkenes involves the breaking of the double bond and the addition of oxygen to form two carbonyl groups. The product formed depends on the position of the double bond and the number of carbon atoms on either side of it.

When propene undergoes oxidative cleavage, it forms a ketone with three carbons, namely acetone, as the only product. This is because propene has a double bond between the second and third carbon atoms, and upon cleavage, it forms two carbonyl groups, one on each end of the double bond, resulting in acetone with three carbons.

In contrast, alkenes with four or more carbon atoms will form a mixture of ketones and aldehydes upon oxidative cleavage.

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