Which resource produces the cleanest energy?

coal
gasoline
oil
wind

Answer:

B. 225 W

Explanation:

Power is the measure of the amount of work done in a certain time frame. It can be found using the following formula.

p=w/t

where w is the amount of work done in joules and t is the amount of time in seconds.

We know that 900 joules of work was done in 4 seconds.

w=900 J

t= 4 s

Substitute these values into the formula.

p=900 J/ 4 s

Divide 900 by 4

900/4=225

p= 225 J/s

1 Joules of work per second (J/s) is equal to 1 Watt (W). Therefore, we can substitute Watts for Joules per second.

p= 225 Watts

The power is 225 Watts, and the correct answer is B.

Answer:

11

Explanation:

An atomic number of 11 means this atom will have 11 protons. A mass number of 23 means 23 - 11 this atom will have 12 neutrons. Since this atom is neutral the positive protons must be equal to the negative electrons. This atom will have 11 electrons

Answer:

Sodium: Na

It is a metal

It's family is Alkali metals

Its atomic number is 11

It has 12 neutrons, 11 protons, 11 electrons

Answer:

It's the last one PLEASE MARK BRAINLIEST

Answer:

Classification makes it easier for scientists to study certain groups of organisms.

Answer:

If you are looking for like a drawing say less.

Answer:

39

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

Answer:

No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.

RR & WW

red and white

rr stands for  Red

WW stands for white.

The parent plant's genotype is simply the known allelic constitution of the parent plant's genes. For example, if one parent plant has a genotype of BB and the other parent plant has genotype bb then the progeny plants will all be of genotype Bb.

Answer:

\(\large \boxed{\text{4.21 mol}}\)

Explanation:

We must do the conversions :

mass of Zn ⟶ moles of Zn ⟶ moles of ZnO

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:     65.38

              Zn + … ⟶ ZnO  + …

m/g:   275

(a) Moles of Zn

\(\text{Moles of Zn} = \text{275 g Zn}\times \dfrac{\text{1 mol Zn}}{\text{65.38 g Zn}} = \text{4.206 mol Zn}\)

(b) Moles of ZnO

The molar ratio is 1 mol ZnO:1 mol Zn

\(\text{Moles of ZnO} =\text{4.206 mol Zn} \times \dfrac{\text{1 mol ZnO}}{\text{1 mol Zn}} = \text{4.21 mol ZnO}\\\\\text{The reaction produces $\large \boxed{\textbf{4.21 mol}}$ of ZnO}\)

Answer: the first paragraph is rain forest biome and the 2nd one is arctic tundra biome and finally the last paragraph is ocean or marine biome

Explanation:

rain forests have warm temperatures and include alot of animals and plants , artctic tundra biome includes cold temperatures ice stuff and all that and ocean or marine biome is pretty much just the ocean with seals , whales and marine life yk.

Answer:

A: It is available all the time

Explanation:

It's kinda all of them but A is the most reasonable.

Answer:

answer is B

Explanation:

A renewable resource is a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale.

Answer:Post this to the collage or higher level Desperately

Explanation:

Answer:

Claim: A water molecule moves through the water cycle in a continuous journey that involves changes in state and location.

Evidence: The journey of a water molecule begins when it evaporates from a body of water, such as a lake or the ocean, due to the energy from the sun. The water molecule rises into the atmosphere and joins other water molecules to form a cloud. As the cloud moves, it may pass over a mountain and cool, causing the water molecules to condense into liquid or solid form and fall as precipitation. Some of the precipitation may fall into a lake or river, where it can flow downstream and eventually enter the groundwater system. The water in the groundwater system may eventually resurface in a lake or river, or it may be extracted from a well for human use.

Reasoning: The movement of a water molecule through the water cycle is driven by a combination of physical and chemical processes, including evaporation, condensation, precipitation, and infiltration. The sun provides the energy that drives the cycle, causing water to evaporate and rise into the atmosphere. As the water molecules cool, they may condense into clouds and eventually fall as precipitation. The movement of water through the cycle is also influenced by factors such as temperature, pressure, and gravity. For example, water will flow downhill due to gravity, which can cause it to move through the groundwater system and eventually resurface in a lake or river. Overall, the water cycle is a complex and continuous journey that is essential for maintaining the Earth's water supply and supporting life.

Explanation:

Answer:

B

Explanation:

since the farther you go out in the atmosphere the temperature decrease and the air pressure drops

Answer:

Solar Eclipse happens when the moon gets between the sun and the earth, the moon gets all the light and blocks the earth from getting sunlight.

Hope this helps ;) ❤❤❤

Answer:

It takes a very long time for things to become fossil fuel. Hence why it’s called non-renewable

Explanation:

Answer:

Because it takes tremendous effort to break free from the laws of gravity to exit the Earth's atmosphere

Explanation:

Earth cannot be a closed system because it needs energy from the extraterrestrial source such as sun. Space shuttle can leave the gravitational field of earth by applying sufficient energy.

Gravitational force is a kind of force by which an object attracts other objects into its center of mass. Earth attracts every object on its surface to the ground that's why we are all standing on the ground.

An object from the earth is able to escape from the gravitational field of earth when moving to the space.  Earth can't be a closed system since it need energy from sun.

The major source of energy for earth is sun. Heat and light energy is radiating from the sun to the earth's surface. Thus,  earth is forming an open system.

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Answer:

No.

Explanation:

philosophy is not a science. Science uses the scientific method to form hypotheses and then test them by gathering or generating empirical evidence.

Answer:

no it is not branch of science

The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.

For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.

A voltaic cell, also known as a galvanic cell or an electrochemical cell, is an electrochemical device that generates electrical energy through a spontaneous chemical reaction. It consists of two half-cells connected by an external circuit and a salt bridge or porous barrier that allows the flow of ions between the two half-cells.

Each half-cell consists of an electrode immersed in an electrolyte solution. The electrode is typically made of a metal or a conductive material, and the electrolyte is a solution containing ions that can participate in the redox (reduction-oxidation) reaction.

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Answer:

The number of atoms of each kind is indicated by a subscript following the atom. If there is only one atom, no number is written. If there is more than one atom of a specific kind, the number is written as a subscript following the atom.

Answer:

D they are all acidic

Explanation:

This is because they are positively charged by hydroniums

Answer:

Part 1: Sodium and Rubidium.

Part 2:

Protons = 12

reason: protons are equal to the atomic number of an atom. For Magnesium, atomic number is 12.

Neutrons:

\( = { \tt{24 - 12 }} \\ = { \tt{12 \: neutrons}}\)

reason: neutrons is given by formula:

\({ \tt{neutrons = mass \: number - atomic \: number}}\)

where mass number of magnesium is 24.

electrons: = 12 electrons

reason: Magnesium atom has electrons summing up to 12

part 1: hydrogen and sodium? my memory is so bad ngl

part 2: 36 because there are 12 protons, 12 electrons, and 12 neutrons in an atom of magnesium.

Answer:

B

Explanation:

Thermal clothing is something you wear under your regular clothing. It prevents you from getting chilly.

Answer:

kl

Explanation:

According to the concept of solubility and electrolysis , KI would form an electrolytic solution in water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer: Plants get there nutrients from not only the soil but from the sun as well. The sun provides the plants with food/energy. The plants take in the sun light and turn it into glucose, glucose is used by plants to give them energy.

Explanation: