which of the following is not an appropriate unit for momentum?
g•m/s
kg•m/hr
km•m/s
g•cm/min

The answer is 32 electrons.

Answer:

32 electrons are the maximum electrons found in the N shell.

Explanation:

According to the periodic table, Maximum number of electrons in any energy level of known element is 32 which is found in N shell.

Each shell can contain fixed number of electrons. The first shell is the K shell that holds two electrons, the second shell that is L shell which holds eight electrons(2+6), The third shell is M shell which holds 18 electrons(2+6+10), and the fourth shell is N shell which holds the maximum number of electrons that is thirty two(2+6+10+14) electrons. The general formula is [tex]2n^{2}[/tex] electrons.

The outermost shell is called the valence shell and the electrons present in these shell are called valence electrons. Each shell consists of one or more subshells, and each subshell consists of one or more atomic orbitals.

This is known as modern periodic law

According to this repetition of properties occurs when elements are arranged in order of increasing atomic number.

This law was proposed by Mendleev.

Previously the periodic law was that the properties are repeated with atomic mass.

The periodic law, which emerged in the 20th century, suggests that properties of elements repeat periodically when arranged by their atomic numbers. This is depicted in the periodic table, where elements are ordered by their atomic numbers in rows and columns, grouping elements with similar properties. The periodic table thus facilitates the prediction of element behavior.

The repetition of properties in elements, when arranged in order of increasing atomic number, is best described by the periodic law. This law states that the properties of elements are periodic functions of their atomic numbers. The periodic table, where this law is visibly demonstrated, organizes elements in increasing order of their atomic numbers in horizontal rows (periods) and vertical columns (groups).

Atoms with similar properties within this table are grouped in the same column. Each atomic box typically contains the element's symbol, atomic number, average atomic mass, and possibly its name. The periodic mapping of elements through atomic numbers rather than atomic masses emerged in the twentieth century and its modern version is widely accepted across the world today.

Since the periodic table's organization is based on shared properties among elements, it provides an efficient system for predicting the behavior of an element. Therefore, it becomes simpler to understand why elements in the same group have similar characteristics, for instance, why the metallic character increases as we move down a group.

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The answer to this question is:

The mobility of electrons.

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Answer:

The ionic bond occurs between two different atoms (metal and nonmetal), while the covalent bond occurs between two equal atoms (nonmetals),

Another difference between these is that the covalent bond is an electron compartment, while in the ionic bond there is an electron transfer.

Metal bonding occurs when metals are combined with each other. Metal atoms need to give up electrons to reach the configuration of a noble gas. In this case, the metals lose the valence electrons and an electron cloud forms between the positive nuclei.

Answer is: true.

Demand decreases and competition increases decrease the quantity supplied.

Quantity supplied is the quantity of a commodity that producers are willing to sell at a particular price at a particular point of time.

Quantity demanded is the quantity of a commodity that people are willing to buy at a particular price at a particular point of time.

Quantity demanded can change at the same price depending upon factors like recession, changes in the taste of the consumer.

Competition is rivalry between two or more economic groups.

5 miles per hour

20/4=5

When making toast in toast oven, the following energy transformation occur

a) electric energy is converted to heat energy which heat up the filaments of toaster, which helps in roasting of toast.

b)the heat energy is transferred to bread or toast

When making toast in a toaster oven, energy transformations occur from electrical energy to thermal energy, and from thermal energy to radiant energy.

When making toast in a toaster oven, two examples of energy transformation that occur are:

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He concluded that all tissues are made up of cells.

Theodor Schwann, along with Matthias Jakob Schleiden, is credited with the formulation of the Cell Theory in 1839, which postulates that all living things are comprised of cells, the cell is the essence of biological structure and function, and that new cells are produced from the division of existing cells.

Theodor Schwann, a renowned zoologist, together with botanist Matthias Jakob Schleiden, contributed to one of the fundamental concepts in biology known as the Cell Theory. After extensive observation and research, they proposed that cells form the elementary building blocks of all living organisms and that all life is cellular in nature. This discovery laid the groundwork for modern biology and emphasized the universal importance of the cell as the basic structural, functional, and biological unit of all living organisms. Schwann's pivotal work highlighted that the cell is not merely a random assortment of matter, but a complex and dynamic unit vital for life. Further contributions by Rudolf Virchow, who added the idea that new cells can arise only from other pre-existing cells, completed the robust framework of the theory that continues to underpin biological research and understanding to this day.

If a bald eagle flies at 50 km/h, then it would take about 1.2 minutes to fly 1 kilometer. Therefore, the closest answer is B. 1 minute.

If an eagle flies at an average speed of 50 km/h, it means that in 1 hour, the eagle would cover 50 kilometers. To find out how long it would take the eagle to fly 1 kilometer, we have to divide the total time for its average (1 hour, or 60 minutes) by the total distance it can cover (50 kilometers).

So, 60 minutes divided by 50 kilometers equals 1.2 minutes. Thus, it would take the eagle approximately 1.2 minutes to fly 1 kilometer. Therefore, the answer is B. 1 minute (rounded off).

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Simply put, MA = Force Out / Force in. That's the way it is usually stated. The force out is normally what you need to move. The force in is what you need to supply to get the force out. Most machines will give you an MA of more than 1. Some (like your arm) will give you less than 1 and others (like this one) will give you exactly one.

This one is frictionless, otherwise it would slip into less than one if it had friction.

Answer B

Answer:

Mechanical advantage in this situation is equal to 1.

Explanation:

The mechanical advantage of a simple machine gives a relationship between the input force applied to the output force. Mathematically, it is given by :

[tex]MA=\dfrac{F_o}{F_i}[/tex]

Where

[tex]F_o\ and\ F_i[/tex] are output force and input force

In this case, the weight of the crate of vegetables is 100 N

Force exerted by her to lift the crate with a pulley is 100 N

The mechanical advantage in this situation is given by :

[tex]MA=\dfrac{100}{100}=1[/tex]

So, the mechanical advantage in this situation is equal to 1. Hence, the correct option is (b) "equal to 1".          

Answer:

The chemical formula B2(SO4)3 represents boron sulfate.

James Chadwick was assigned the task of tracking down evidence of Rutherford's tightly bound "proton-electron pair" or neutron. In 1930 it was discovered that Beryllium, when bombarded by alpha particles, emitted a very energetic stream of radiation. This stream was originally thought to be gamma radiation.

We have to distinguish a solution of sodium sulphite from a solution of sodium sulphate in the laboratory.

Solution of sodium sulphite is acidified with dilute HCl and to that when few drops of barium chloride (BaCl₂) solution is added, white precipitate is formed. The white precipitate is soluble in HCl.

To this solution 2 drops of iodine (I₂) solution is added and brown colour of iodine is discharged as I₂ gets reduced to HI.

The reactions involved in case of sodium sulphite is are:

Na₂SO₃ + BaCl₂ = BaSO₃ ↓ + 2NaCl

                         (white precipitate)

BaSO₃ + 2HCl = BaCl₂ + H₂SO₃

H₂SO₃ + I₂ + H₂O = H₂SO₄ + 2HI

On the other hand, solution of sodium sulphate is acidified with dilute HCl and to that when few drops of barium chloride (BaCl₂) solution is added, white precipitate is formed. The white precipitate of BaSO₄ is formed which is insoluble in HCl.

Na₂SO₄+ BaCl₂ = BaSO₄ ↓ + 2NaCl

                        (white precipitate)

In the given question,

HgxOy (2.50 g) = xHg (2.405 g) + yO

Here, mass of oxygen = 2.50 - 2.405

= 0.095 g

The moles of O₂ = 0.095 / 16 = 0.00594 moles

Moles of Hg = 2.405 / 200.60 = 0.01198 moles

Thus, the ratio of Hg : O is,

0.00594 : 0.01198 or 1 : 2

As the ratio is 1 : 2, thus, the empirical formula is Hg₂O

In most cases, carbon shares electrons with other atoms (usual valence of 4). This is because carbon typically bonds with elements which have a similar electronegativity. Examples of covalent bonds formed by carbon include carbon-carbon, carbon-hydrogen, and carbon-oxygen bonds

answer is covalent bond because carbon has 4 valence electron and shared them hence it is a covalent bond.

Answer:

D

Explanation:

It's pretty easy to balance equations! Basically you want to make sure that the number of each compound is equal on both sides of the arrow.

For example number one is

Fe + H2SO4 -> Fe2(SO4)3 + H2

A 3 in front of H2SO4 because there's a subscript of 3 on the right side.

Then a 3 in front of H2 because of the previous step.

Then add a 2 in front of Fe because of the 2 subscript in Fe2(SO4)3

Then add a 1 in front of Fe2(SO4)3 because you already have an equal number of each element.

2Fe + 3H2SO4 -> 1Fe2(SO4)3 + 3H2

I hope this explanation helps! You should really do your homework because practice is everything when it comes to chemistry. You'll need to know how to do it for exams.  

TRUE its glucose if they have sunlight

Hi There,

The answer is:

True

Hope this helps have a great day :)

 The number  of  carbon monoxide that  are in 10 ml at STP  is 2.68 x 10²⁰  molecules

 calculation

Step 1 :  convert 10 ml to L

convert 10 ml to L = 10/1000 =0.01 L

Step 2: find the moles of CO at STP

That is at STP  1  mole  = 22.4 L

                           ?moles = 0.01 L

by cross  multiplication

= {0.01 L x 1 mole)/22.4 L} =4.46 x 10⁻⁴  moles

Step 3 ; find the  number of   molecules of Co  using the Avogadro's law constant

that  according to Avogadro's  law  1  moles = 6.02 x 10²³

                                                  4.46 x 10⁻⁴ moles =? molecules

by cross multiplication

= {(4.46 x 10⁻⁴  moles) x( 6.02 x 10²³  molecules) / 1 mole}  =2.68 x 10²⁰  molecules

Final answer:

The result of the multiplication should have two significant figures since the number with the least number of significant figures involved in the calculation is 0.0065, which has two significant figures. option B

Explanation:

The question is asking how many decimal places or significant figures the result of the multiplication (3.540) × (0.0065) × (401) should have. According to the rules of significant figures, the answer should have the same number of significant figures as the measurement with the fewest significant figures.

In this case, that is the number with two significant figures, which is 0.0065. Therefore, the final answer should also have two significant figures.

Additionally, it's noted that the number 0.0065 would be expressed as 6.5 × [tex]10^{-3}[/tex] in scientific notation, which confirms it has two significant figures. It is important to calculate it completely to generate an accurate answer with proper significant figures.

I believe the correct answer would be the substances that are formed. Why?  Because during a chemical change, the substances (scientifically called reactants) which are changed into other substances are called products.  

Hope I could help! :)

A chemical reaction is a series of events that involves the reactants and the products. The product of the reaction is the substances that are formed. Thus, option A is correct.

Products are the substances that are formed when the chemical reactants undergo changes in the bond breaking and formation resulting in a new substance in the form of compounds, molecules, or elements. They are formed at the end of the reaction and are on the right side of the equation.

The reactants are the chemical substances that underwent reactional alterations that cause the change in the bonds and the chemical properties causing the formation of the products. They are present at the initial stage of the reaction and are on the left side of the equation.

Therefore, the products are formed at the end of the reaction.

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Your question is incomplete, but most probably your full question was, Which of the following describes the products of a chemical reaction?

A.The substances that are formed

B.The substances that are changed

C.The starting materials

D.The chemical ingredients

stand up eye wash station

Answer:

The answer is: When a foreign substance, usually irritating, penetrates the eyes, and for people with sensitive eyes.

Explanation:

An eyewash liquid, or eyewash liquid system is a liquid, usually a saline solution, used as an emergency or safety mechanism in laboratories and industrial plants as an aid to eye rinsing, s when a foreign substance, usually irritating, penetrates in them.

These eye drops can be beneficial for people with sensitive eyes and can provide relief from the side effects of painful sensation.

The answer is: When a foreign substance, usually irritating, penetrates the eyes, and for people with sensitive eyes.

A sodium cation is smaller than a sodium atom.

Hopefully this is right...

The sun is our ultimate source of energy, silly!

The ultimate source of energy on Earth is the sun, which powers life and processes through nuclear fusion. Its energy supports photosynthesis and is stored in fossil fuels, while modern solar technology enables us to harness this energy directly.

The ultimate source of energy on Earth is the sun. This massive celestial body fuels virtually all processes and life forms on our planet. Through a process called nuclear fusion, the sun converts hydrogen into helium, releasing vast amounts of energy that travel to Earth as sunlight. This energy is critical for photosynthesis, the process by which plants produce food, thereby supporting the food chain and various ecosystems. Besides, the sun's energy is stored in fossil fuels like coal and petroleum, which are remnants of ancient plants and animals.

Although these fossil fuel resources are finite and will eventually deplete, the sun represents an essentially unlimited supply of energy. Modern solar technology, including photovoltaic cells, harnesses this sunlight directly to produce electricity, offering a renewable and sustainable alternative to fossil fuels. Solar energy's challenge lies in efficiently capturing and converting it to meet global energy demands.

A positive calcium ion and a negative oxygen ion can form an ionic bond with each other, as they have opposite charges which attract. Such a pairing would result in the formation of the ionic compound calcium oxide (CaO). Options involving two negatively charged ions or two positively charged ions, as well as a neutral atom paired with a negative ion, do not produce ionic bonds because there is no attractively charged pairing.

An ionic bond is formed when one atom donates an electron to another atom, resulting in the formation of positively charged ions (cations) and negatively charged ions (anions). This type of chemical bond typically occurs between metals, which tend to lose electrons, and non-metals, which tend to gain electrons, leading to a compound with a net zero charge. For particle pairs to form an ionic bond, one must be a positive ion and the other a negative ion.

Looking at the options provided:

A. A negative oxygen ion (anion) and a negative chlorine ion (anion) would both have a negative charge and therefore could not form an ionic bond with each other due to like charges repelling.

B. A positive sodium ion (cation) and a positive magnesium ion (cation) both have positive charges and, like option A, would repel rather than form an ionic bond.

C. A positive calcium ion (Ca2+) and a negative oxygen ion (O2-) have opposite charges and would attract each other to form an ionic bond, resulting in the ionic compound calcium oxide (CaO).

D. A neutral fluorine atom and a negative sulfur ion (anion) also cannot form an ionic bond because the neutral fluorine atom does not have a charge to attract the negatively charged sulfur ion.

Therefore, the correct answer is C: a positive calcium ion and a negative oxygen ion can form an ionic bond with each other, illustrating the transfer of electrons and the electrostatic attraction that characterizes ionic bonding.

Answer:

NO ---> N +2 and O -2

Explanation:

Oxidation numbers are assigned to the elements of a compound to keep a track of the number of electrons each atom has.

Here we have a compound NO (Nitrogen Oxide). The Nitrogen is assigned an oxidation number of +2 while Oxygen in this compound is assigned an oxidation number of -2.

So the algebraic sum of the oxidation numbers of the elements in the compound NO is equal to zero.

Answer:

+2, -2

Explanation:

As per the rule of assigning oxidation number, the oxidation number of O atom is -2. The sum of the oxidation number of a neutral compound is zero. Let us assume x to be the oxidation number of N.  

x + (-2) = 0

x – 2 = 0

x = +2  

Therefore the oxidation of N in NO is +2 and and the oxidation of O in NO is -2 respectively.

Answer: 6.71 g

Explanation: [tex]6Li(s)+N_2(g)\rightarrow 2Li_3N[/tex]

[tex]{\text{no of moles}}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

[tex]{\text {moles of lithium}}=\frac{4g}{6.914g/mol}=0.578moles[/tex]

[tex]\text{moles of nitrogen}=\frac{4g}{28g/mol}=0.143moles[/tex]

Limiting reagent is the reagent which limits the formation of product. Excess reagent is one which is in excess and thus remains unreacted.

Thus lithium is the limiting reagent and nitrogen is the excess reagent.

As can be seen from the balanced chemical equation,  6 moles of lithium reacts with 1 mole of nitrogen to give 2 moles of lithium nitride.

Thus 0.578 moles of lithium react with 0.096 moles of nitrogen.

6 moles of lithium give = 2 moles of lithium nitride

Thus 0.578 moles of lithium give=[tex]\frac{2}{6}\times {0.578}=0.19moles[/tex] of lithium nitride.

Mass of lithium nitride [tex]Li_3N={\text {no of moles}}\times {\text {Molecular mass}}[/tex]

Mass of lithium nitride[tex]Li_3N[/tex]=[tex]{0.192moles}\times {34.83g/mol}=6.71g[/tex]

Answer: 4.02

Explanation:

-- 4.00 g Li x   1 mol Li   x   2 mol LiN   x   20.948 g LiN   = 4.02 g LiN

                      --------------     ----------------       ---------------------

                      6.941 g Li        6 mol Li              1 mol LiN

-- 4.00 g N2 x   1 mol N2   x   2 mol LiN   x   20.948 g LiN   = 5.98 g LiN

                          --------------     ----------------       ---------------------

                       28.014 g N2      1 mol N2           1 mol LiN

Matter can be classified into four states:

1) Solid: This state is composed of uncharged particles that are held together very closely in a regular arrangement by strong intermolecular forces of attraction.  

2) Liquid: Like solids, this state is also composed of uncharged particles. However, compared to the solids these lie farther apart  and are held by relatively weaker forces

3) Gas: In this state, the interacting particles are uncharged and have a lot of space between them to move freely.

4) Plasma: This is the fourth state of matter composed of highly charged particles which are far apart from each other and possess high kinetic energies.

Based on the given characteristics:

In State 4 the particles are uncharged with a relatively low separation between them. This corresponds to the liquid state.

Ans: B

It's a Liquid! Sorry if it's too late!