1. If the absorbance of a 0.000040 M dye sample is 0.43 in a cuvette of path length 1.0 cm, what is the extinction coefficient of the dye?

The pressure of a gas inside a balloon filled with 0.8450 mol of gas at 315.00K is 1.374atm.

The pressure of a gas can be calculated by using the following formula:

PV = nRT

Where;

According to this question, a 15.9L balloon is filled with 0.8450 mol of gas at 315.00 K. The pressure is calculated as follows:

P × 15.9 = 0.8450 × 0.0821 × 315

15.9P = 21.85

P = 1.374atm

Therefore, the pressure of a gas inside a balloon filled with 0.8450 mol of gas at 315.00K is 1.374atm.

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While sea water does not freeze at -1°C, fresh water does.

The prediction will be "I think that the salt in the seawater keeps it from freezing at -1 Celcius."

The problem statement is "How come the water on the roof is frozen and the sea water is not?"

The statement that contains data is "I'm going to get some fresh water and some salt water and expose them to a temperature of-1°C and see what happens."

In a temperature of -1°C, fresh water is frozen while sea water is not.

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These rocks turns into the rust by the process of the oxidation. As rust can be expands, so it can weakens the rocks and helps break it apart.

We know that from our daily life rust for example is iron oxide. When specially the rocks which contains the iron, if exposed or leave to the water and air, then the iron undergoes an oxidation reaction as a result which can weaken the rocks and make the rocks crumble from the inside.

Actually the oxidation produces an iron oxides minerals. The process of the rusting can also change the colour of the iron. It can be changed in several colours like red, brown or yellow.

So we can conclude that these rocks turns into the rust by the process of the oxidation. As rust can be expands, so it can weakens the rocks and helps break it apart.

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We can see from the timescales in the question that; average stars evolve more slowly than massive stars.

Stars are massive structures which produce heat and light by nuclear fusion. The term fusion has to do with the combination of one or more nuclei to form a larger nucleus. Heat and light are evolved in the process. The temperature at which this fusion occurs is so great that it is not possible to achieve the fusion reaction here on earth as the outrageously high temperatures required to do so is almost impracticable.

Stars are able to change from one form to another by the process of  stellar evolution. This process could give rise to both the massive stars as well as the smaller size average stars as we have them in the outer space and visible to the astronomers by the use of telescopes.

Thus, we can then conclude from what is shown in the image that; average stars evolve more slowly than massive stars.

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Answer:

First reaction which is the silver + nickel 2 molecules is right answer of the question

Possible identity of this metal sample is gold

Here given data is unknown metal mass=14.8 g sample displaces=0.767 mL of water we have to find density of given metal=?

Density=mass/volume

Here mass=14.8 g and volume=0.767

Density=mass/volume

Density=14.8g/0.767

= 19.29≈19.30 means 19.3

So in the listed metal above answer are matched with gold

Therefore gold has  19.3 density.

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Answer:

Explanation: A scientific theory is well-explained and well-tested scientific idea about the natural world. On the other hand, a scientific law is a statement that describes an observed phenomenon and its conditions.

b. A scientific theory is an explanation of an event in the natural world. However, it differs to a scientific law. Unlike a scientific theory, a scientific law does not provide an explanation but it gives us a description of an observed phenomenon.

A chemical reaction does occur when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined.

The correct answer choice to the above is option a.

This means that when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined, it gives lead II chloride and nickel trixonitrate IV

The net ionic equation is given below:

Pb(NO3)2 + NiCl2 ----- PbCl2 + Ni(NO3)2

Pb2+ NO3- + Ni2+Cl- ----- Pb2+ Cl- + Ni2+ NO3-

Chemical reactions are those reactions whereby substances combine together to form other substances. The substances which combine together are called the reactants while the new substance formed is known as product.

So therefore, a chemical reaction does occur when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined.

Complete question:

Does a reaction occur when aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined?

a. yes

b. no

If a reaction does occur, write the net ionic equation.

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Answer:

below

Explanation:

Oil and water don't mix because they are insoluble (do not mix) to each other. The only way to separate water and oil would be to use a separating funnel. A separating funnel is a funnel that has the ability to separate two liquids.

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a substance that is  made of two oxygen atoms for each carbon atom .

A compound is the  substance that contains two or more atoms which chemically combined together in a fixed ratio by mass

.For example, CO₂ is a compound and its ratio by mass is 12:32 which is equal to 3:8. Whereas when a substance with atoms of only a single element is known as a pure substance.

So, we can conclude that the substance made of two oxygen atoms for each carbon atom describes a compound.

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Electron configuration can be defined as the specific arrangement of negatively charged electrons in different energy levels around atomic nuclei.

  Electronic configuration of 4 = [He]2s2

 Electronic configuration of 2= 1s2

 Electronic configuration of -1= No configuration

 Electronic configuration of 1/2= No configuration

 Hence electronic configuration finds this above way.

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The mass (in kilograms) of carbon dioxide that will be created when 8.72 kilograms of pentane combust is 26.64 Kg

We'll beging by writing the balanced equation. This is given below:

C₅H₁₂ + 8O₂ -> 5CO₂ + 6H₂O

The following were obtained from the balanced equation:

From the balanced equation above,

0.072 Kg of C₅H₁₂ reacted to create 0.22 Kg of CO₂

From the balanced equation above,

0.072 Kg of C₅H₁₂ reacted to create 0.22 Kg of CO₂

Therefore,

8.72 Kg of C₅H₁₂ will react to creat = (8.72 × 0.22) / 0.072 = 26.64 Kg of CO₂

Thus, 26.64 Kg of CO₂ were created from the reaction

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Conversion of units is the conversion between different units of measurement for the same quantity and the values is the same as 400.0 mm is 4.0 x 10³ cm

Here given value are 400.0 mm and the value are in millimeter we have to convert mm into cm so 1 millimeter = 0.1 centimetre

Here given value are 400.0 mm in that only decimal point correction are seen means here three zeros are seen then we will write this zeros in 10 raised to power then correct option is c means 4.0 x 10³ cm

400.0 mm×1cm/10³ = 4.0 x 10³ cm

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In the periodic table, positive ions grow in magnitude from left to right, whereas negative ions grow in magnitude from right to left.

The periodic table shows that there are more valence electrons on the right than the left. The maximum amount of ionic charge that an element can hold fluctuates as the quantity of valence electrons rises.

Metals on the periodic table's left side mostly produce positively charged ions. These ions get stronger with time, increasing in size.

The negative charges on the ions that nonmetals on the right side of the periodic table produce, have a diminishing magnitude with time.

For example, when we move from atomic number10 to 11, because we are changing from a noble gas to a very reactive alkali metal, moving from such an element with a full octet to one with just the outermost electron, which readily relinquishes it in order to follow the octet rule, there is a very significant degree of change in reactivity.

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Answer:

Top = H₂SO₄, H₂O   or    H₃O⁺

Middle = 1.) Hg(OAc)₂, H₂O
              2.) NaBH₄

Bottom = 1.) BH₃ · THF
               2.) H₂O₂, NaOH

Explanation:

In the top reaction, the alcohol is being added to the most substituted carbon in the entire molecule. The top reaction could use H₂SO₄, H₂O as the reagents or H₃O⁺ as the reagent.

In the middle reaction, the alcohol is being added to the most substituted carbon included in the double bond. Hg(OAc)₂ is the shorthand way of representing mercury (II) acetate.

In the the bottom reaction, the alcohol is being added to the least substituted carbon included in the double bond.

Octane is a hydrocarbon and an alkane with the chemical method C8H18, and the condensed structural system CH3CH26CH3. Octane has many structural isomers that fluctuate by using the quantity and vicinity of branching inside the carbon chain. any such isomers, 2,2,four-trimethylpentane usually called iso-octane is used as one among the standard values in the octane score scale.

Octane is colloquially used as a quick form of octane score specifically in the expression high octane. Octane score is an index of a gasoline's ability to withstand engine knock-in engines having exclusive compression ratios, which is a feature of octane's branched-chain isomers, especially iso-octane. The octane rating of gas is not directly related to the strength output of an engine. using gasoline of a better octane than an engine is designed for can't boom electricity output.

Nonane can have a better boiling factor than octane because it has an extended carbon chain than octane. Octane can have a higher boiling point than 2,2, three,three‑tetramethyl butane, because it branches much less than 2,2,3,3‑tetramethyl butane, and consequently has a larger floor vicinity and extra van der Waals forces. Nonane could have a better boiling factor than octane because it has an extended carbon chain than octane.

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Answer: A

Explanation: the iron is liquid (so not D), it’s below the mantle but not above the crust (so not B &C)

2 is the region where the substance is in both solid and liquid phases.

The term "phase" refers to a uniform or homogeneous quantity of matter that may be mechanically separated from a nonhomogeneous mixture. It can be made up of a single material or a combination of substances. Although crystalline, colloid, glassy, amorphous, and plasma phases are thought to exist, the three basic phases of matter are solid, liquid, and gas.

A phase change is defined as the transformation of a phase from one form to another. A system can have phases that are solid, liquid, or gaseous. Strong atomic bonds and high viscosity give solids their characteristic rigid form. Insofar as they have a three-dimensional periodic atomic arrangement, most solids are crystalline; nevertheless, certain materials lack this periodic organization and are noncrystalline, or amorphous.

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Answer:

0.801 moles H₂CCl₂

Explanation:

To find the amount of moles, you need to multiply the given mass by the molar mass. The molar mass is a ratio describing the mass (g) per every 1 mole. The molar mass of H₂CCl₂ can be calculated by adding the atomic masses of each atom within the molecule.

When multiplying a number by the molar mass, it is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the numerator). The final answer should have 3 sig figs like the given value (68.0 g = 3 sig figs).

Atomic Mass (H): 1.008 g/mol

Atomic Mass (C): 12.011 g/mol

Atomic Mass (Cl): 35.453 g/mol

Molar Mass (H₂CCl₄): 2(1.008 g/mol) + 12.011 g/mol + 2(35.453 g/mol)

Molar Mass (H₂CCl₂): 84.933 g/mol

 68.0 g H₂CCl₂             1 mole
-------------------------  x  ------------------  = 0.801 moles H₂CCl₂
                                     84.933 g

Potassium emits more electrons with the greater velocity.

The electric charge of the electron, a subatomic particle, is a negative one elementary charge. Because they are assumed to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.

The velocity of the electrons from potassium is 8.055 x 105 m/s

The velocity of the electrons from sodium 2/5 V

According to Bohr's model the velocity of an electron is-

[tex]V_{N}[/tex] = [tex]Ze^{2}[/tex] /2nh

[tex]V_{n}[/tex] ∝  1/5

[tex]V_{5}/V_{2}[/tex]

=  2/5

Given that:- [tex]V_{2}[/tex] =v

[tex]V_{5}[/tex]

= 2/5 v

Hence the velocity of an electron will be

2/5v.

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The pace at which an object's position changes in relation to a frame of reference is known as its velocity, and it depends on time.

The primary indicator of an object's position and speed is its velocity. It is the distance that an object travels in one unit of time.

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The balanced net iconic equation :

Salt and water are created when an acid and a base interact then Acid-based reaction happens. Because both water and salt are neutral, if an acid and a base react together, they cancel out each other's effects. It is referred to as a neutralization reaction as a result.

An acid-base reaction is a chemical reaction involving an acid and a base.

H+ and OH- ions are produced by bases and acids, respectively, and these ions combine to make water. There are a number of drawbacks to the Arrhenius theory. Because it defines acids and bases in terms of what occurs when compounds dissolve in water, it can only be applied to reactions that take place there.

One or more hydrogen ions, H+, are exchanged between entities that may be neutral (such as H2O) or electrically charged (ions-ammonium, NH4+; hydroxide, OH; or carbonate, CO32); in an acid-base process.

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Answer:

each level of calcium holds 8 electrons

Answer:

First look up the ideal gas law: PV=NRT, where P=pressure, V=volume, N=amount of gas in moles, R=universal gas constant, and T=Temperature in degrees K. See Ideal gas law - Wikipedia for details.

Then consider the following:

Inside a tire, V and R are constants, while P, N, and T vary.

What makes a tire seem hard or soft is the difference in pressure between the air in the tire and the air around the tire.

A so-called flat tire is not devoid of air; it just has the same pressure inside as outside.

When you pump up a tire, you are increasing N by forcing more air molecules into the tire. As V is a constant volume, you create a pressure difference between inside and outside.

This pressure difference varies with how much you pump the tire (P), as well as the temperature around the tire (T) and the air pressure around the tire (atmospheric or “ambient” pressure).

The fact that an inflated tire is in balance with ambient pressure — with the added influence of PV=NRT — has some counter-intuitive results. For example,

I’ve had bike tires blow out by being left in a hot car. Why? The pressure in the car is the same, but the pressure in the tire increases as T increases until it’s beyond the safe limit.

More rarely, I’ve heard reports of bike tires blowing out by being carried in the unpressurized hold of an airplane. In this case, the tire doesn’t get hot; instead, the pressure outside the tire decreases, until the tire can’t hold in the pressure. In actuality, this is really hard to do; the tire has to be over-pressurized to start with; the difference in ambient pressure is not enough to blow out a typical bike tire.

Answer:

i believe it is " D, the interaction of elements "

Answer:

metals tend to lose electrons

Answer:

Explanation:

1M

Force is a vector quality that measures both direction and magnitude of a push or pull on an object.          

Force is an influence or impact that can change the position or the motion of an object. it can cause an object with mass to change its velocity that is to accelerate or decelerate. It can be also stated as push or pull on an object. it  obey vector law of addition that is it has both magnitude and direction.

Its formula is mass multiplied by acceleration that is F=m.a

its unit is N (Newton).

there are different types of forces frictional, constant, tension etc.

Force is a vector quantity that measures both direction and magnitude of a push or pull on an object this is the correct sentence.

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Answer:

(Question 1) Which statement best describes force?

(Answer) Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.

(Question 2) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?

(Answer) The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.

(Question 3) Which of the following scenarios accurately describes magnitude and direction?

(Answer) A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.

(Question 4) What is force directly proportional to?

(Answer) the acceleration and mass of an object

(Question 5) Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?

(Answer) The box exerts 10 N of force downward.

Explanation:

just did the Quick Check, Enjoy UwU

A. The number of protons the Fermium atom is 100

B. The number of neutrons in the Fermium atom is 157

Fermium has atomic number of 100.

Atomic number is simply defined as the number of protons in the nucleus of the atom.

Thus, the number of protons in the Fermium atom is 100

The number of neutrons in the Fermium atom can be obtained as follow:

Mass number = Proton + Neutron

257 = 100 + Neutron

Collect like terms

Neutron = 257 – 100

Neutron = 157

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