Rounding to the nearest
tenth, what is the mean of
85, 85, 100, 90, 100, 85,
80, 100, 90?

The ratio of two isotopes of oxygen (16O:18O) in the shells of marine micro-organisms is useful in determining worldwide temperature patterns.

This is because the ratio is affected by the temperature of the surrounding water during the formation of the shell. Therefore, scientists can use this ratio to reconstruct past temperature changes and understand global climate patterns over time. This technique is known as oxygen isotope analysis and has been used to study climate change over millions of years.

Isotopes are distinct forms of the same chemical element that have a varied number of neutrons but the same number of protons and electrons. Isotopes are different forms of the same element with slightly different nucleon counts owing to slight variations in the total number of neutrons in their nuclei.

An element's atomic number uniquely identifies that element, but not its isotope; the number of neutrons in an atom of a particular element may vary widely. The mass number of an atom is equal to the sum of the nucleon counts of its protons and neutrons, and the mass numbers of the many isotopes of a particular element vary.

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Josef Loschmidt and Amedeo Avogadro were both scientists who made significant contributions to the understanding of basic molecular numbers, sizes, and reaction ratios.

In 1811, Amedeo Avogadro proposed that equal volumes of gases at the same temperature and pressure contain the same number of molecules. This became known as Avogadro's law, which laid the foundation for the concept of the mole.

Josef Loschmidt, on the other hand, made important contributions to determining the size of molecules. In 1865, Loschmidt used kinetic theory to calculate the number of molecules in one cubic centimeter of gas at standard temperature and pressure (STP). He estimated the number to be about 2.7 x 10¹⁹, which is close to the modern value of Avogadro's number.

The term "Avogadro's number" was not coined until the early 1900s, long after Avogadro's death. The name was proposed by French physicist Jean Baptiste Perrin in honor of Avogadro's contributions to the concept of the mole.

In my opinion, the name "Avogadro's number" is appropriate because Avogadro's law was the first concept to establish a relationship between the volume of a gas and the number of molecules it contains. Moreover, Avogadro's law played a crucial role in the development of the mole concept, which is essential in chemical calculations. While Loschmidt's contributions were also significant, he did not propose a fundamental law like Avogadro did. Therefore, I believe that naming the number after Avogadro is appropriate to recognize his contributions to this fundamental concept in chemistry.

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Answer: a, 1 b,1 c,0

Explanation:

Answer:

A= 1

B= 1

C= 0

Explanation:

The missing question is:

What is the percent efficiency of the laser in converting electrical power to light?

The percent efficiency of the laser that consumes 130.0 Watt of electrical power and produces a stream of 2.67 × 10¹⁹ 1017 nm photons per second, is 1.34%.

A particular laser consumes 130.0 Watt (P) of electrical power. The energy input (Ei) in 1 second (t) is:

\(Ei = P \times t = 130.0 J/s \times 1 s = 130.0 J\)

The laser produced photons with a wavelength (λ) of 1017 nm. We can calculate the energy (E) of each photon using the Planck-Einstein's relation.

\(E = \frac{h \times c }{\lambda }\)

where,

\(E = \frac{h \times c }{\lambda } = \frac{6.63 \times 10^{-34}J.s \times 3.00 \times 10^{8} m/s }{1017 \times 10^{-9} m }= 6.52 \times 10^{-20} J\)

The energy of 1 photon is 6.52 × 10⁻²⁰ J. The energy of 2.67 × 10¹⁹ photons (Energy output = Eo) is:

\(\frac{6.52 \times 10^{-20} J}{photon} \times 2.67 \times 10^{19} photon = 1.74 J\)

The percent efficiency of the laser is the ratio of the energy output to the energy input, times 100.

\(Ef = \frac{Eo}{Ei} \times 100\% = \frac{1.74J}{130.0J} \times 100\% = 1.34\%\)

The percent efficiency of the laser that consumes 130.0 Watt of electrical power and produces a stream of 2.67 × 10¹⁹ 1017 nm photons per second, is 1.34%.

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Answer:

restore adequate breathing

Explanation:

If you suspect smoke breathing, inquire healing consideration and stimulate crisis aids. If the martyr is in a held room and you suspect poisonous vapor, open the doors roomy and allow the smoke escape before permanently introducing.'

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In an ecosystem, rain water harvesting is a  a solution of saving water as a resource .

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .

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Answer:

c

Explanation:

A formula that shows how many atoms of each element a substance contains

Answer:

Giraffe, rhinoceros, grasshopper, mouse, and deer

Explanation:

Primary consumers eat producers (plants). Therefore, all the animals that eat the plants are primary consumers.

Answer:

cricket, mouse, snake, bird

Explanation:

The property of matter that is conserved in chemical reactions and shown by balanced equations is known as the Law of Conservation of Mass. According to this law, mass can neither be created nor destroyed in a chemical reaction; it can only be transformed from one form to another.For instance, when two substances are combined, they react and form a new substance.

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Answer:

combustion of methane gass will take place when the flame is yellow

Dry heat can both enhance and diminish the thickening ability of starch while also inducing unwanted color changes. Proper control of temperature is a critical factor that significantly impacts the overall outcome.

When subjected to high temperatures, starch granules undergo swelling and even burst. This leads to the release of starch molecules into the surrounding liquid, resulting in thickening and imparting a viscous texture. This phenomenon is commonly observed in sauces and gravies as they simmer and thicken on the stove.

However, excessive heat can cause a loss of thickening ability and undesirable color changes. When exposed to temperatures above 170°C, starch molecules can undergo breakdown and begin to brown. This gives rise to a yellow or brown color in the final product. A familiar example is bread, which turns brown during baking due to these color changes.

To preserve the desired texture and color of the final product, it is crucial to carefully monitor the heat when working with starch. Maintaining control over the temperature and duration of heat exposure becomes essential.

In summary, dry heat can both enhance and diminish the thickening ability of starch while also inducing unwanted color changes. Proper control of temperature is a critical factor that significantly impacts the overall outcome.

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The chemical name of KI is potassium Iodide, Fe2O3 is ferric oxide , (NH4)3PO4 is ammonium phosphate.



Chemical name is just the name we use in our daily life and IUPAC name follows rules for naming a compound .

The chemical name is Ferrous sulphate and the IUPAC name is 2-dimethyl hexane.

Rules for chemical naming are :

1) Write the name of both elements.

2) Change the ending of second element.

3) Place prefix in front of each element based the number of atoms present .

4)There shouldn't be two vowels in one row .

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Answer:

blue white green and brownn

Explanation:

seen one

Answer:

isopropyl alcohol

Explanation:

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The term "atomic theory" is used instead of "atomic hypothesis" because it signifies the evolution and acceptance of the concept over time.

While Democritus initially proposed the idea of atoms in 400 BCE, it was merely a hypothesis without substantial experimental evidence. Over centuries, scientific investigations and advancements led to a deeper understanding of atomic structure and behavior.

The term "atomic theory" acknowledges that the concept of atoms has undergone refinement and modification based on experimental evidence and theoretical developments.

It recognizes that the understanding of atoms has evolved from a speculative hypothesis to a well-established scientific theory supported by extensive experimental observations, mathematical models, and empirical data.

The term "theory" conveys the comprehensive and validated nature of our understanding of atoms, encompassing their complex structures and behavior.

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a. Silver coin - Element (Silver is a pure element and is not chemically combined with any other element in a silver coin)

b. Air - Mixture (Air is a mixture of gases, primarily nitrogen and oxygen, with trace amounts of other gases and particles)

c. Coffee - Mixture (Coffee is a mixture of various compounds such as water, caffeine, and organic compounds that give it its flavour and aroma)

d. Soil - Mixture (Soil is a mixture of various substances such as minerals, organic matter, water, and air)

My everyday experiences influenced my response because I have come across these examples in my daily life and have been taught about them in science classes. For example, I know that air is composed of different gases and particles, and that soil is made up of a mixture of substances, including minerals and organic matter. Similarly, I know that a silver coin is made of pure silver and that coffee is made of various compounds.

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Answer:

A

Explanation:

I am going to use the example of Enzymes, which are simply catalysts, but of biological origin. These enzymes would provide another path, which has a lower activation energy. In this way, catalysts reduce the amount of energy required to start the reaction.

Answer:

ATP—Adenosine triphosphate, a nucleotide which is the most important short-term energy storage compound in cells. It is the “energy currency” of the cell, necessary for practically all metabolic activities. Carbohydrate—A type of organic molecule made of carbon, hydrogen, and oxygen.

Apollo boasted to Cupid about how much larger his bow was. Apollo was offended, and Cupid hit him with a golden love arrow in retaliation, leading him to fall in love with the first person he saw.

Apollo had cracked far too many jokes about Eros. Eros shot Apollo with one of his golden arrows as a kind of retribution, which caused Apollo to fall hopelessly in love with the nymph Daphne.

The next action taken by Cupid was something Apollo did not anticipate. The god of love flapped his wings as he soared alongside the god of music. Then, with a "golden arrow with a keen gleaming point," he shot him in the chest.

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Answer:

45

Explanation:

The given atomic mass is 44.96 amu. If you take the average and round it to the nearest whole number it will be the most abundant isotope.

Answer:

An organism is made up of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this organization makes the components easier to understand

Explanation:

The correct answer is option A. a photon of light is emitted. When an electron in an atom jumps from a high-energy orbital to a lower-energy one, a photon of light is emitted.

A change in energy is taking place here. A photon, a particle of light, is released as energy as the electron transitions from the higher energy state to the lower energy state.

Atoms emit light as a result of this procedure, which is referred to as spontaneous emission.

A wider energy gap results in a photon with a higher energy since the photon's energy is equal to the energy difference between the two orbitals.

This explains why the energy of various colours of light vary.

Complete Question:

When an electron in an atom jumps from a high-energy orbital to a lower-energy one, what happens?

A. a photon of light is emitted

B. a photon of light is absorbed

C. the atom's temperature changes

D. none of the above

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Answer:

cells arose from preexisting cells

Explanation:

Rudolph Virchow is a German biologist that built on the work of other scientists such as Theodor Schwan to contribute his own quota to the development of the cell theory as it is currently known.

After several studies, Virchow rejected the idea of spontaneous generation and accepted the initially rejected idea of cell division. He earlier believed that cell division only takes place is some special type of cells and not in all cells.

Even though Virchow was not the first to bring the idea of cells arising from preexisting cells, he was the one that popularized the idea and added it to the earlier belief that all living organisms are made up of cells.

Answer:

B

Explanation:

Answer:

Compounds containing two elements (so called binary compounds) can either have ionic or covalent bonding. If a compound is made from a metal and a non-metal, its bonding will be ionic. If a compound is made from two non-metals, its bonding will be covalent.

Explanation:

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the flow of water

Explanation:

it's actually b)

Answer:

Because in order to find the average, you need to divide by the number of sites tested. Sometimes that doesn't divide evenly.

Explanation: