What is the maximum number of electrons that can occupy the third (n=3) shell?

A) 2

B) 3

C) 6

D) 8

E) 18

Answer:

d) A positive charge  

Explanation:

This is the definition of a proton: a particle in the nucleus that has a positive charge .

Explanation:

All boron isotopes have 5 protons.

B11 has 6 neutrons, so its atomic mass is:

6 (1.008664 u) + 5 (1.007276 u) = 11.0884 u

B10 has 5 neutrons, so its atomic mass is:

5 (1.008664 u) + 5 (1.007276 u) = 10.0797 u

So the average atomic mass of boron is:

0.80 (11.0884 u) + 0.20 (10.0797 u) = 10.8866 u

The closest whole number is 11.

Answer:

4 significant figures

Explanation:

The zero after decimal is not significant figure.

Answer:

Whether there is life on Titan, the largest moon of Saturn, is at present an open question and a topic of scientific assessment and research. Titan is far colder than Earth, and its surface lacks stable liquid water, factors which have led some scientists to consider life there unlikely.

Explanation:

Answer:

The answer for this question would be B- An unbalanced force

Answer:

the answer is b

Explanation: I'm guessing

Answer:

Yes. Burning usually observes this kind of law.

Explanation:

Answer:

The type of vegetation a surface does affect the water coming from above to sink in or runoff.

Explanation:

This is how the vegetation affects the runoff:-

The leaves and stems present in the vegetation do not let the water fall directly on the soil and makes the process rather slow which makes the water to get to the ground slowly and sink in properly inside the soil rather than running off.

If the vegetation present is dense with  there was being hairy then also the water would not run out and will get absorbed by the roots letting the soil intact

Answer:

0.135 km

Explanation:

1 km = 1000 meters

The experiment titled "Investigating the Chemical Reaction between Baking Soda and Vinegar" explores the chemical change that occurs when baking soda (sodium bicarbonate) reacts with vinegar (acetic acid).

The objective is to observe the production of carbon dioxide gas and understand the resulting reaction. A balloon filled with baking soda is placed over a container of vinegar, and the baking soda is allowed to mix with the vinegar.

This causes a chemical reaction to take place, leading to the release of carbon dioxide gas. The balloon inflates due to the gas, and observations are made regarding the appearance, sounds, and size changes of the balloon.

The experiment demonstrates that the reaction between baking soda and vinegar creates new substances, indicating a chemical change. The experiment offers a hands-on way to learn about chemical reactions and their outcomes.

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Dots in a Lewis electron dot diagram represent valence electrons of an atom, and the number of dots indicates the atom's valence electrons. This visual tool helps predict chemical bonding capabilities. For ions, cations show fewer dots and anions have more compared to their neutral atoms.

In a Lewis electron dot diagram, dots are utilized to symbolize the valence electrons of an atom. These dots are arrayed around the symbol of the element and indicate how many electrons are found in the outermost shell of the atom, which are available for chemical bonding. The amount of dots provides insight into the atom's reactivity, with each dot representing a potential for bond formation.

For instance, the Lewis electron dot diagram for hydrogen is depicted with a single dot, as hydrogen has one valence electron. Conversely, a Lewis electron dot diagram for an oxygen atom will show six dots around the oxygen symbol, reflecting its six valence electrons. Moreover, in the case of ions, a cation (positively charged ion) will exhibit fewer dots than its neutral atom counterpart, whereas an anion (negatively charged ion) will display additional dots.

Answer:

c

Explanation:

Answer:

A

Explanation:

Answer:

PCl₃  

Explanation:

If a molecule contains one P atom and three Cl atoms, its formula must be PCl₃.

A is wrong, because the formula PCl means one atom of P and one of Cl.

C and D are wrong, because the formula P₃Cl indicates a molecule consisting of three P atoms and one Cl atom.

Answer:

PCl sub-3

Explanation:

just checked!!!

Answer:

The fundamental forces or interactions is a term used in physics that explains the Forces that present in nature in their most basic form and cannot be further reduced.

Explanation:

The force of gravitation and the subatomic forces present inside the atom also known as some nuclear reactions and electromagnetic reaction are certain examples of fundamental forces.  all these forces are in their basic form of nature.

These  all make four such forces while another fifth force is a hypothetical one and is believed to be in existence hypothetically by the scientists.

Answer:

B. 5.0 x 10^(-23)

Explanation:

m= n × MM

where

m is mass

n is moles

MM is molecular mass

One molecule of a substance is 1/ 6.022 ×10^23 moles

The molecular mass of C2H6 is the sum of the atomic masses of each of the atoms present in the molecule. 2 carbon atoms + 6 hydrogen atoms. This gives

30.07.

So m= (1/(6.022×10^23)) × 30.07 = 5.0 ×10^(-23)

Mass of a substance can be calculated by using the formula:

Mass (m) = moles (n)  ×  Molar mass (M)

The correct answer is:

Option B. 5.0 × 10²³

Explanation for this is:

       = 2(12) + 6(1)

       = 24+6

       = 30

       = 5.0 × 10²³gm

Therefore, 5.0 × 10²³ gm is the mass of one molecule of ethane.

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Answer: you should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.

Explanation:

1) less dense

2) more dense

hope this helps bebe :)

Answer:

Explanation:

Oxygen molecules and Nitrogen molecules forms in a very similar way. The attraction between particles of oxygen is great due to its very high electronegativity value. Oxygen has a higher electronegative value compared to nitrogen.

Electronegativity of an atom is the relative tendency with which atoms of an element attracts valence electrons in a chemical bond. Valence electrons are used in forming chemical bonds. They can be transferred from one atom to the other or they can be shared.

Oxygen is the second most electronegative atom on the periodic table. To form a bond, it shares the valence electrons in order for its octet to be complete. Pull for the valence electrons between the contributing atoms is very strong due to their large electronegative values. This pull is stronger compared to that between nitrogen atoms.

Final answer:

Oxygen molecules have greater intermolecular forces than nitrogen due to magnetic interactions from unpaired electrons (paramagnetism) and oxygen's higher electronegativity.

Explanation:

The force of attraction between oxygen (O₂) molecules is greater than that between nitrogen (N₂) molecules due to the nature of intermolecular forces at play. Oxygen molecules have two unpaired electrons in their outer orbitals, which facilitates the formation of weak magnetic interactions between them known as paramagnetism. These paramagnetic forces add to the usual London dispersion forces contributing to a stronger overall attractive force compared to nitrogen, which does not exhibit this magnetic property due to its paired electrons. Furthermore, oxygen's slightly higher electronegativity may also enhance these attractive forces compared to nitrogen.

Final answer:

There is a multitude of hair colors due to variations in melanin (eumelanin and pheomelanin) which are produced by melanocytes. These variations are genetically determined and influenced by multiple genes, resulting in a broad spectrum of hair shades.

Explanation:

The reason for the many different hair colors we see is primarily due to the pigmentation of hair follicles caused by two types of melanin: eumelanin and pheomelanin. The presence of more eumelanin leads to darker hair, while less eumelanin results in lighter hair. The levels and ratios of these pigments can change over time, which can cause a person's hair color to change. Furthermore, hair color can also vary between individuals due to the diverse genetic factors that determine the type and quantity of melanin produced by melanocytes. Hair color is an example of a polygenic trait, meaning it's controlled by multiple genes, such as MC1R, TYR, TYRP1, SLC24A5, and KITLG. Instead of being a simple black, brown, or blond, hair color encompasses a wide spectrum that can include various shades and hues, influenced by genetic variability and genetic penetration.

Answer:

The answer Is fire burning, because the wood being burned is changing to carbon

Answer:

fire burning

By using Physical properties unknown substance can be identified as it involves determination of a substance with out changing their composition or property include color, odor, taste, density, melting point etc.

Chemical properties can be observed or measured when a substance undergoes any type of changes chemically while Physical properties can be observed without changing anything.

In chemical property, chemical reaction is conducted to show the property of the substance while in physical property No chemical reaction occur.

Chemical properties related to chemical bonds while Physical properties do not have such a relationship.

Chemical properties include radioactivity, toxicity, flammability, heat of combustion,  etc. while physical properties include Molecular weight, boiling point, melting point, freezing point, volume, mass, length, density shape, solubility, etc.

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Final answer:

Chemists identify unknown substances by observing and measuring their physical and chemical properties, such as color, mass, and melting point, and comparing them to known values or by noting the chemical changes that they undergo.

Explanation:

To identify an unknown substance, chemists use various properties that can be observed or measured. Among these properties are physical properties like color, state (solid, liquid, or gas), mass (which is related to weight), and texture. Then there are chemical properties which can be discerned through chemical changes that the substance undergoes to produce new matter, as in the case of rust formation from iron, oxygen, and water. To determine if the substance is organic or inorganic, scientists may look for the presence or absence of carbon-based compounds.

Specific laboratory techniques like measuring the melting point can also be used to identify substances. By comparing the melting point of an unknown to literature values, and perhaps mixing a sample with a known substance and retesting, accurate identification can be achieved. If the melting point remains sharp and similar to the literature values, the unknown is likely correctly identified.

In a practical scenario using available lab equipment, such as a laser or ray box and a reference guide of optical properties, a substance's refractive index or how it bends light, might be used for identification. Therefore, physical and chemical properties serve as the basis for identifying unknown substances in chemistry.

Answer: Decreased temperatures and increased salinity. Colder water is denser than warm water and the higher the salinity of water the denser it is.

Answer:

D. decreased temperature and increased salinity

Explanation:

Edge Correct Answer

Neon at 500K (Option D) will most closely approach ideal behavior because at this high temperature, its weak dispersion forces are easily overcome, allowing it to behave more like an ideal gas.

The key to determining which gas most closely approaches ideal behavior is to consider both the intermolecular forces and the conditions of temperature and pressure. Real gases deviate from ideal behavior under conditions of high pressure and low temperature because these conditions allow the volume and intermolecular forces of the gas particles to no longer be negligible. Therefore, a gas will behave more ideally at higher temperatures and lower pressures, where the kinetic energy of the gas particles is high enough to overcome intermolecular attractions.

In this case, even though all gases are at the same pressure, the temperature is different. Ammonia is a polar molecule with stronger intermolecular forces, specifically hydrogen bonding. In contrast, neon is a noble gas with very weak dispersion forces due to its non-polarity and small atomic size. Given the choices, neon at 500K (Option D) will most closely exhibit ideal behavior because the high temperature would provide sufficient kinetic energy to overcome the already weak dispersion forces between its atoms.

Answer:

28,800

Explanation:

First convert hours to minutes.

60 minutes in an hour so: 24 x 60 = 1,440 (mins)

Second convert minutes to seconds.

60 seconds in a minute so: 1,440 x 60 = 86,400

Divide 86,400 by three. For every three seconds, you inhale once; 3:1 ratio.

86,400/3 = 28,800

This gives us our final answer. You inhale approximately 28,800 times in a 24 hour day.

Answer:

One sulfur atom

Explanation:

The compound ZnSO₄ is made up of:

       1 atom of Zn

       1 atom of S

       4 atoms of O

These atoms combines chemically to form the above compound. The coefficient 3 before the compound only shows the number of moles of the compound that are there. Most times, the coefficient balances the chemical equation.

Therefore, we can say 3 moles of ZnSO₄ consists of 1 atom of Zn, 1 atom of S and 4 atoms of Oxygen.

Answer:The pure substance within chemistry is a very simple concept to grasp. Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together). ... Purity can also have an important impact on the chemical properties of a substance.

Explanation:

A pure substance is a material with a fixed chemical composition, and it can be either an element or a chemical compound. It exhibits specific melting and boiling points, and chromatography reveals its pure status. While absolute purity is rare, highly pure substances are used in specialized industries.

A pure substance is a material that consists entirely of one type of matter with a fixed chemical composition. It can be classified as an element or a chemical compound. For example, oxygen is composed only of oxygen atoms, making it a pure substance. Similarly, water (H2O) is a pure substance because it is always composed of two hydrogen atoms bonded to one oxygen atom in a fixed ratio.

To determine the purity of a substance, scientists use techniques like melting and boiling point analysis, and chromatography. Pure substances have distinct melting and boiling points, unlike mixtures which melt or boil over a range of temperatures. Chromatography, on the other hand, separates a substance into its components; if only one component is present, the substance is pure.

Attaining absolute purity is challenging, but in specialized applications such as semiconductor manufacturing, materials approach near-absolute purity, like hyperpure water. The concept of purity is fundamental in understanding the properties and behaviors of substances in chemistry.

Complete question:

What is a pure substance ?

Final answer:

Jim, who measures mass, may use kilograms, an appropriate unit for objects with considerable mass like textbooks. Smaller items, like bananas, would be measured in grams, while milligrams are used for very tiny masses in scientific settings.

Explanation:

The student whose measurement might be in kilograms is Jim, who measures mass. Kilograms are the appropriate unit for measuring objects with considerable mass, such as textbooks or humans. For example, a textbook has a mass of about a kilogram. In contrast, grams would be more suitable for measuring smaller objects like a banana, since a banana's mass is typically around 120 grams - far less than a kilogram. Milligrams are even smaller units, which would not be practical for everyday objects as they are usually used to measure tiny quantities, as might be done by scientists in a lab. In learning environments, balances or scales are used to measure mass, which can range from small milligrams up to a few kilograms.

To choose the appropriate tool for following measurements: 1. The volume of a water balloon would be measured using a measuring cup or another volumetric tool. 2. The length of a basketball court would be measured using a measuring tape or a laser distance meter. 3. The weight of an apple is most conveniently measured using a kitchen scale, which would likely display in grams. 4. The volume of a milk carton could be indicated on the carton but could also be measured using a graduated cylinder or measuring jug.

Answer:

It is written exactly like that; Mg3N2

Explanation:

Roman numerals are used sometimes to show the charge of an ion that can be multiple charges.

The compound Mg3N2 is magnesium nitride, a binary ionic compound without Roman numerals in its formula; Roman numerals are used for metals with variable charges, not for those like magnesium with a fixed charge.

The compound Mg3N2 is known as magnesium nitride, which is a binary ionic compound. When writing chemical formulas for such compounds, you write the metal ion with its charge, followed by the nonmetal ion with its charge. Magnesium has a charge of +2 and nitrogen has a charge of -3. However, no Roman numerals are included in the formula Mg3N2 because magnesium has a fixed oxidation state of +2 and does not require indicating its charge through Roman numerals, unlike transition metals with variable charges. Roman numerals are used when naming ionic compounds of cations with variable charges such as iron in iron(II) chloride or iron(III) oxide.

Answer: True

Explanation: What this means is that like a cookbook, people misinterpret it as very simple, taking out the problem, bringing an observation then mixing in a few questions, sprinkling a hypothesis put it all in an experiment and the conclusion would just POP OUT OF THE OVEN. But it’s not as simple as that.

Answer:

The answer is B

Explanation:

The answer B talks about precautions, which you would have to know if you want to be safe during a science experiment, so I believe that is the best option.

Hope this helps brother :-)

Answer:The molecules in a raw egg absorb the heat energy, they use this energy to change shape

Such a chemical reaction is said to be endergonic, which means 'energy in'.

Egg molecules will never undergo these reactions without the input of energy (usually in the form of heat)

I hope this helps, if not, let me know :)

Answer:

The Photosynthesis Equation. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 . Hope this helps you! :)