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To find the number of neutrons in an atom of an element using the periodic table, subtract the atomic number from the atomic weight.

To find the number of neutrons in an atom of an element using the periodic table, you need to look at the element's atomic number and atomic weight. The atomic number represents the number of protons in the nucleus of an atom. The atomic weight represents the average mass of all the isotopes of an element, taking into account the abundance of each isotope.

To find the number of neutrons, you subtract the atomic number from the atomic weight. This is because the atomic weight includes both protons and neutrons, so subtracting the atomic number (which represents the number of protons) gives you the number of neutrons. For example, for helium (atomic number 2, atomic weight 4.0026), there are 2 neutrons (4.0026 - 2 = 2).

Therefore, the correct option is: The number of neutrons is equal to the atomic weight minus the number of protons.

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A chemical spill can disrupt nutrient cycles by causing nutrient overload in soils, leading to eutrophication in nearby water bodies, which depletes oxygen and harms aquatic life. The use of artificial fertilizers contributes to this issue, upsetting delicate ecosystem balances and creating long-term ecological consequences.

A chemical spill can significantly affect nutrient cycles in soil, with various negative environmental impacts. Chemicals such as those from fertilizers lead to increased levels of nitrogen and phosphorus, which can cause eutrophication in water bodies. Eutrophication is characterized by excessive algae growth that depletes oxygen, affecting aquatic life and disrupting the balance of ecosystems. Moreover, a chemical spill may also increase soil acidity or alkalinity, altering the soil's ability to hold and cycle nutrients like nitrogen, phosphorus, and sulfur, which are vital for plant growth. In some cases, chemicals may leach nutrients away from soil, diminishing the soil's fertility and impacting plant life.

Human activities including the use of artificial fertilizers exacerbate these effects. Runoff from these fertilizers adds to the nutrient load in water bodies, triggering algal blooms, causing oxygen depletion, and creating dead zones where aquatic life cannot survive. The aftermath of such spills affects not only plants but also the animals that depend on those plants, thereby altering the entire ecosystem.

Nutrient pollution due to overuse of fertilizers in agriculture and residential settings significantly upsets aquatic ecosystems. The runoff contributes to the accumulation of harmful toxins which can affect human health and lead to extensive ecological damage that may take decades to reverse.

A chemical spill can disrupt nutrient cycles in soil by causing excess nutrients like phosphorus to leach away and by promoting eutrophication due to nitrogen-rich compounds. This imbalance can degrade soil health, harm aquatic ecosystems, and contribute to broader environmental issues such as global warming and acid rain.

A chemical spill can greatly affect the nutrient cycles in soil. These cycles are integral to maintaining the balance of elements like nitrogen and phosphorus. A spill can lead to an excess of certain nutrients, which may alter soil chemistry. For example, a chemical spill containing phosphorus can increase its chemical mobility, making it prone to leaching and resulting in a decline in stored nutrients vital for plant growth. On the other hand, nitrogen-rich compounds from artificial fertilizers, if spilled, can cause excessive eutrophication, creating algae overgrowth and depleting oxygen in nearby water bodies, thus jeopardizing aquatic life. Additionally, altered nitrogen cycles due to human activity such as fossil fuels combustion and the use of artificial fertilizers contribute to various ecological disturbances, including global warming and acid rain. Ongoing eutrophication can have serious long-term consequences, such as dead zones in oceans and can disrupt the natural nitrogen fixation process essential for plant and soil health.

The choices are:

Carbonate

ore

silicate

a mineral

The correct option is:

ore
Explanation:

An ore is an experience of rock or sediment that comprises sufficient minerals with economically valuable elements, typically metals, that can be economically derived from the deposit. The ores are obtained from the earth through mining; they are then polished (often via smelting) to extract the important element or elements.A metal is a material (an element, compound, or alloy) that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.

Answer:

ore

Explanation:

cuz

When a liquid loses sufficient energy, it changes its state from liquid to solid, a process called freezing. The particles in the liquid slow down and form fixed positions, becoming a solid. The temperature remains constant during this phase change until the entire substance has transformed.

When a liquid releases enough energy, it undergoes a phase transition or change of state from liquid to solid, typically known as freezing. This process occurs as the particles in the liquid lose energy and slow down, enabling them to form fixed positions and turn into a solid substance. This is quite evident in water; when it cools sufficiently and loses enough thermal energy, it becomes ice.

In phase transitions, it's important to note that the temperature of a substance remains constant until the phase change is complete. For instance, the temperature of water stays at 0 degrees Celsius (32 degrees Fahrenheit) when freezing, despite losing energy, until all the water has turned into ice.

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Answer : The correct option is, (A) ionic bonds

Explanation:

Ionic bond : It is defined as the bond that is formed by complete transfer of electrons from one atom to another atom.

That means, the atom which looses the electron is known as electropositive atom and the atom which gains the electron is known as electronegative atom.

The ionic bond is usually formed between a metal and a non-metal.

Covalent bond : It is defined as the bond which is formed when sharing of electrons takes place between the atoms.

This is usually formed between two non-metals.

When a transition metal reacts with chlorine then they form ionic bond because transitions metals are metal and chlorine is a non-metal. So, transition metal and chlorine will form an ionic bond.

Hence, the correct option is, (A) ionic bonds

Answer:

The grains from smallest to the largest are as follows-

(1) Clay (Diameter, D< 0.004 mm in diameter)

(2) Silt (D= 0.004 to 0.0625 mm)

(3) Sand (D= 0.0625-2 mm)

(4) Gravel (D= 2-4 mm)

(5) Pebble (D= 4-256 mm)

(6) Cobble (D= 64-256 mm)

(7) Boulder (D> 256 mm)

These sediments are weathered from the source rock and are transported from the source area to a different place and then they are compacted and lithified as a result of which detrital (clastic) sedimentary rocks are formed. For example, sandstone, siltstone, sandstone, conglomerate and breccia.

Answer:

the answer on your test will be.

The rock formed in a fast-moving stream.

The answer is absolute time.

Answer: Health Occupations Students Of America

Explanation:

The reason ice cream melt on a hot day and the type of thermal energy transfer is "the absorbent of heat around it and exothermic thermal energy.

Exothermic thermal energy is the type of thermal energy that makes an ice cream melt on a hot day.

Ice cream melts because it absorbs the energy around it in the form of heat or thermal energy. This extra energy causes the atoms to vibrate, turning the solid into a liquid. The exact melting point of ice cream depends on what is added to the ice cream base.

Read more on Thermal Energy:

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The answer is: B. alloy.

The best choise in using low force (100 N, 200 N, 300 N) to move the ball is alloy, because it has the greatest distance (25 m, 30 m, 80 m).

One newton is the force needed to accelerate one kilogram of mass (in this example bat) at the rate of one metre per second squared in direction of the applied force.

Newton's second law of motion: F = m · a.

F -  force applied.

m - mass of the object receiving the force.

a - the acceleration of the object.

Answer:

D. Solids have a fixed mass, volume, and shape

Explanation:

solid have fixed volume, mass and shape due to this they are closely packed.

The molecules in the solid stay in fixed points and they are tight together.

Dalton explained that all the elements are made up of atoms.

Plasmas contain both positive ions and negative charges in equal quantity.

The number of protons in an element is always equal to the number of electrons.

Thus option(D)  Solids have a fixed mass, volume, and shape is the correct answer.

Answer:

The velocity of the bowling should be 2 m/s in order to an have same momentum as that of basket ball.

Explanation:

Momentum is defined as motion possessed by the moving object.it is calculated by multiplying mass of the object with its velocity.

[tex]Momentum(P)=mass(m)\times Velocity(v)[/tex]

Mass of basket ball = m = 1 kg

Velocity of the basket ball,v = 12 m/s

Momentum of the basket ball = p

p = 1 kg × 12 m/s = 12 kg m/s

Mass of bowling ball = m' = 6 kg

Velocity of the bowling ball = v'

Momentum of the bowling ball = Momentum of the basket ball = p

p = m' × v'

12 kg m/s = 6 kg × v'

v ' = [tex]\frac{12kg m/s}{6 kg}= 2 m/s[/tex]

The velocity of the bowling should be 2 m/s in order to an have same momentum as that of basket ball.

Answer:

mole

Explanation:

just cause

D. A liquid becoming gas

Answer: The current flowing through the circuit is 0.2 Amperes.

Explanation:

Ohm's Law is defined as the law which determines the relationship between current and potential difference across a resistor.

Mathematically,

[tex]V=IR[/tex]

where,

V = Potential difference across the resistor = 1.5 V

I = Current flowing through the circuit = ? A

R = Resistor in the circuit = [tex]7.5\Omega[/tex]

Putting values in above equation, we get:

[tex]1.5=I\times 7.5\\\\I=0.2A[/tex]

Hence, the current flowing through the circuit is 0.2 Amperes.

Exceeding the Earth's carrying capacity can have negative consequences, such as a population crash and collapse of ecosystems.

When the Earth exceeds its carrying capacity, it means that the resources available are being used up faster than they can replenish. This can lead to several negative consequences. For example, if the human population continues to increase, the birth and death rates could decrease, causing a population crash. Additionally, the ecological footprint of humans would increase beyond the Earth's ability to support it, potentially leading to a collapse in the population.

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