What is the SI base unit of temperature?

Final answer:

Neutral zinc atoms will always have the same number of protons, designated by the atomic number (Z) which is 30. While the number of neutrons can differ, creating various isotopes with different masses, the chemical properties of these isotopes are the same. Thus, the factual statement is that both atoms have an equal number of protons.

Explanation:

The question you've asked pertains to the nature of zinc atoms. Neutral atoms of zinc, like all other elements, will have the same number of protons, which is determined by the element's atomic number (Z). For zinc, the atomic number is 30, meaning that each zinc atom has 30 protons.

One of the key points to understand is that the number of neutrons can differ in atoms of the same element, leading to different isotopes of that element. This means that while the number of protons (and electrons in a neutral atom) remains constant, the number of neutrons can vary, affecting the mass number (A) of the isotopes. However, this does not change the chemical behavior of the isotopes since they still have the same number of protons.

Given these fundamental principles, let's review your statements about two neutral atoms of zinc:

Therefore, the correct statement regarding two neutral atoms of zinc is that both have an equal number of protons.

The chronological order of key events in cell biology begins with Hooke's coining of 'cell' in 1665, followed by van Leeuwenhoek's discoveries related to bacteria in the 1670s, Brown's identification of the cell nucleus in 1831, Schleiden & Schwann's cell theory in 1838, Virchow's description of cell division in 1855, and Pasteur's germ theory later in the century.

The key events from the field of cell biology should be organized in the following chronological order:

Robert Hooke coined the term 'cell' in 1665 when he observed cork tissue under a microscope.

In the 1670s, Antonie van Leeuwenhoek improved upon the microscope and was able to discover bacteria and protozoa.

Much later in 1831, Robert Brown identified and named the cell nucleus.

In 1838, Schleiden & Schwann proposed the cell theory which states that all living organisms are composed of cells.

Rudolf Virchow in 1855 described cell division and proposed that all cells arise from other cells.

Finally, Louis Pasteur in the late 19th century disproved spontaneous generation and proposed the germ theory.

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An unbalanced net force must be applied.

Answer: Using fertilizer on crops to increase their yield

Explanation: Apex

The answer is c 5

Bahafbssna

Kaboom. an explosion, because since you lit the fuse, the sparks go off while the fuse get shorter and shorter and then when the use goes into the bomb itself, the Gunpowder Ignites really really fast causing pressure to become higher and higher causing the bomb itself to not contain it and so, it goes kaboom, and shrapnel, A bunch of small metal spikes, Go out in all directions.

So my answer is B: An Explosion. (You're welcome)

Answer:

About 42° North latitude

Explanation:

Latitudes are defined as the lines that oriented in the east-west direction and they are parallel to the equator.

The 3 cities of the United States namely Massachusetts, New York, and Connecticut are on its eastern side The city of Connecticut, New York, and Massachusetts are situated at about (41.60° N and 73.09° W), (40.71° N and 74.01° W) and (42.41° N and 71.33° W) respectively.

These 3 cities are located adjacent to one another and they share a common point at a longitude of about 42° in the Northern hemisphere.

Thus, the above cities meet at about 42° N latitude.

Final answer:

To calculate the mass and volume of alcohol based on its density, we use basic principles of chemistry. The mass of 35.25 mL of alcohol is found to be approximately 27.69 g, and 125.4 g of the same alcohol would occupy approximately 159.65 mL.

Explanation:

The question involves calculating the mass of a certain volume of alcohol given its density and vice versa. First, we find the density of the alcohol using the initial 20 mL sample which weighs 15.71 g. The density (ρ) is mass (m) divided by volume (V), so ρ = 15.71 g / 20 mL = 0.7855 g/mL. Using this density, we can find the mass of 35.25 mL of the same alcohol which would be ρ * V = 0.7855 g/mL * 35.25 mL = 27.687375 g. To find the volume 125.4 g of this alcohol would occupy, we use V = m / ρ = 125.4 g / 0.7855 g/mL = 159.65 mL.

Answer: I think water expands when it freezes and cracks rocks open

Explanation:

Three properties of elements that can be used in sorting elements are; density, refractive index and melting/boiling point.

The properties that can be used to sort elements are intensive properties. These are properties that do not depend on the amount of substance present.

They are unique to each element and can serve as a kind of finger print to identify an element.

Three of such properties are;density, refractive index and melting/boiling point.

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Final answer:

Without a chemical reaction formula, it's not possible to calculate the number of O2 molecules that can be made from 492 grams of sodium phosphate.

Explanation:

The number of O2 molecules made from 492 grams of sodium phosphate requires a stoichiometric calculation based on the chemical reaction involved. However, since no reaction is given, we cannot accurately determine the amount of O2 that could be produced from sodium phosphate. We would need the balanced chemical equation for the decomposition or reaction involving sodium phosphate to calculate the number of O2 molecules formed.

From a mixture of salt and iron, iron can be easily separated using a magnet if they are present as solid fillings. Thus option D is correct.

Magnetism is the ability of a magnet to produce its own magnetic field and attracts magnetically susceptible objects into it. Iron is can acts as a magnet and it easily attracted by a magnet.

There are different methods for separating individual components from a mixture of them. The separation method is  selected based on the physical properties of these substances.

From a mixture of salt and iron, iron can be easily separated using a magnet and all the iron fillings can be collected on to a magnet. Remaining salt can then be purified by dissolving in water and then evaporates off. Hence, option D is correct.

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Answer: the electrons i.e their valence electron

Explanation: valence electron is the number of electron in the outermost shell of an atom. Infact it is the combining power of an element. The valence electron gives us a better understanding of how an element will react with other elements. This is the reason why elements with the same number of valence electron(s) are grouped together telling us that they exhibit similar chemical properties

STP, or standard temperature and pressure, is defined as 0°C (273.15 K) and 1 atm pressure, allowing for standardized comparison of gas properties.

The conditions represented by the abbreviation STP, which stands for standard temperature and pressure, are specifically chosen to provide a reference point for the comparison of the physical properties of gases. Generally, STP is defined as a temperature of 0°C or 273.15 K and a pressure of 1 atm (atmosphere).

However, it is important to note that there are slight variations in this definition, as some organizations like the International Union of Pure and Applied Chemistry (IUPAC) define STP as 0.986 atm, while for simplicity, others may use the rounded value of 1 atm. Despite this, the concept of STP is invaluable for scientists as it allows for standardized comparisons across various gas measurements.