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Answer:

203g

Explanation:

Multiply #moles by cobalt's molar mass:

molar mass= 58.9332g/ 1 mole)

3.45 mole Cobalt (58.9332g/ 1 mole)= 203g <-- 3 significant figures

According to the mole concept, mass of 3.45 moles of cobalt is 203.30 g.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Mass of 3.45 moles of cobalt is obtained as, mass=number of moles ×molar mass

Substitution of values gives ,mass=3.45×58.93=203.30 g.

Thus, the mass of 3.45 moles of cobalt is 203.30 g.

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Answer:

kinetic energy

Particles in solids are always vibrating (moving back and forth) in place. The vibrational motion of particles in solids is kinetic energy. Heat makes the particles in a solid vibrate faster, giving them more kinetic energy.

Explanation:

The kinetic molecular theory of the states of particles describes the behavior, shape, motion, and observable properties. The particles of solids vibrate in a fixed position. Thus, option D is correct.

The kinetic-molecular theory was given for the states of matter and to show the movement and composition of the particles of the solids, gases, and liquids. It shows their motion respective to the phases and effects of various factors.

In kinetic-molecular theory, the solid particles are explained based on behavior and motion. It states that the solids have the least amount of kinetic energy in them due to their dense packaging. The solids are fixed in a place and show the back-and-forth vibration that is possible due to the least distance.

Therefore, option. the solid particles only vibrate at a fixed location.

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Your question is incomplete, but most probably your full question was, According to the kinetic-molecular theory, gas particles, liquid particles, and particles of a solid all experience some type of motion. Which statement best describes the motion of particles of a solid?

A. They are motionless and in fixed positions.

B. They move slower and are farther apart than the particles of a liquid.

C. They are in greater disorder than the particles of a liquid.

D. They vibrate about fixed points.

Answer:

B. Halons

Explanation:

Answer:

i miss you

Explanation:

Answer:

Your answer is D (gain enough kinetic energy to get past each other.)

Explanation:

Melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.

Melting is the process by which a substance changes from the solid phase to the liquid phase. Melting is also known as fusion, although this term has several meanings in science.

Melting occurs when the kinetic energy of a solid increases by application of heat or pressure, such that the molecules of solid start vibrating faster but stay close to their neighboring particles, rolling around each other. This particle movement allows the substance to flow and form a liquid.

Therefore, melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.

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Answer:

Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2). Isotopes of a given element contain different numbers of neutrons, therefore, different isotopes have different mass numbers.

The atomic size of an element significantly depends on the number of protons. It is the characteristic property of isotopes that they possess the same number of protons which is responsible for the same atomic size.

Isotopes may be defined as one of two or more species of atoms of a chemical element that have the same atomic number and location in the modern periodic table with identical chemical behavior but with different atomic masses and physical properties.

In a more simple sense, isotopes are those elements that have the same atomic number but different atomic mass. The atomic number depends on the number of protons which remains constant in isotopes. So, the isotopic elements have identical atomic sizes.

Therefore, the isotopes of the same element have the same atomic size.

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I BELIVE ITS 5 SORRY IF THATS WRONG BUT IM SURE

Answer:

a

Explanation:

Answer:

Calcium cyanamide

Explanation:

I think it has to be calcium cyanide, because of the cyanamide ion (CN).

Answer:

If the pressure of the system increases then the boiling point will increase.

If the pressure of the system decreases then the boiling point will decrease. If there is no change in pressure then the boiling point will remain constant.

Explanation:

Answer:

In case of low-mass stars,the outer layers of the low mass stars are expelled  as the core collapses such that the outer layers form a planetary nebula.

Explanation:

In case of low-mass stars,the outer layers of the low mass stars are expelled  as the core collapses such that the outer layers form a planetary nebula. The core remains as a white dwarf and finally become a black dwarf as it cools down. A low mass star consumes its core hydrogen and turns it into helium over its lifetime.

Given parameters:

Volume of the ruby = 575cm³

Density of the ruby = 3.97g/cm³

Unknown:

Mass of the largest ruby = ?

Solution:

Density is the mass per unit volume of a substance. It is an intrinsic property of matter that is unique to each of them.

Mathematically;

         Density = [tex]\frac{mass}{volume}[/tex]

Since mass is the unknown;

             Mass = density x volume

Input the parameters and solve;

          Mass = 3.97 x 575 = 2282.75g

The mass of the largest ruby is  2282.75g

Answer:

a)11.552

b)8.722

c)29.915

d)8

e)5.4082

f)1.782

g)2.864

h)2.822

i)2.42

j)113

The correct number of significant figures are a.5 b.4 c.5 d.1 e.5 f.4 g.4 h.5 i.3 j.3 for all the calculations.

Significant figures or digits are the minimum numbers from zero to nine which are used for the report of results that are uncertain and decimal is not a significant figue and starting zeros too.

the total number of significant figures are,

a) 3.42 + 8.132 =11.732 = 5 significant figures.

b) 4.9 + 3.822 = 8.722 = 4 significant figures.

c) 17.8 + 12.115 = 29.915 = 5 significant figures.

d) 4.55 + 3.45 = 8 = 1 significant figures.

e) 1.966 + 3.4422 = 5.4082 = 5 significant figures.

f) 3.882 – 2.1 = 1.722 = 4 significant figures.

g) 4.894 - 2.03 = 2.866 = 4 significant figures.

h) 15.6600 - 12.838 = 2.8262 = 5 significant figures.

i) 11.22 - 8.8 = 2.42 = 3 significant figures.

j)133-20 = 113 = 3 significant figures

Therefore, The correct number of significant figures are a.5 b.4 c.5 d.1 e.5 f.4 g.4 h.5 i.3 j.3 for all the calculations.

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Given parameters:

Density  = 2.7g/cm³

Length of the cube  = 10cm

Unknown:

Mass of the cube = ?

Solution:

Density is the mass per unit volume of a substance.

  Density = [tex]\frac{mass}{volume}[/tex]  

                Mass = density x volume

  We need to find the volume of the cube;

    Volume of the cube  = L³

where L is the length of the cube;

         Volume of the cube = 3³ = 27cm³

So, the mass of the granite = 2.7 x 27 = 72.9g

The granite has a mass of 72.9g

Answer:

As per Newton's first laws of motion, everybody continues to be at state of rest or of uniform motion in a straight line unless and until it is compelled by some external unbalanced forces acting on it.

Hence, it is the unbalanced force that changes the state of rest or motion of a body. Balanced force is responsible for keeping the body to be either in static equilibrium or in dynamic equilibrium.

As per the options given in the question, the last one is true for an object under balanced forces.

sorry if this doesn't work

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{89.6}{10} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

l, ll, lll, v

Explanation:

I just took the test ;)

Answer:

Lithium Fluoride.

Explanation:I know science.

Answer:

Yes, a cooking egg is a chemical change! Water is evaporated from the egg and the egg changes composition. You might say that raw egg and water are the reactants and cooked egg and water vapor are the reactants.

Explanation:

Frying an egg is an example of a chemical change.

A chemical change refers to a kind of irreversible change. In this type of change, the element that undergoes a transformation cannot be returned to its original state.

This is the case with an egg which when fried cannot be returned to its original liquid state. So, unlike a physical change tha can be reversed, a chemical change is irreversible.

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Answer:

your  Answer is The first one, Its A,  resercher/ fact checker

Explanation:

Answer:

Be3As2

Explanation:

Answer:

C) Be3As2

Explanation:

A.P.E.X

moisture, condensation, and temperature. 2. Evaporation and condensation are part of how a cloud forms.

Answer:

A) compund

Explanation:

Answer:

The correct option is the first option

Explanation:

The equation described in the question is shown below

²³⁹₉₄Pu +¹₀n ⇒ ¹⁰⁰₄₀Zr + blank + 2¹₀n

This equation is a nuclear fission because it involves the splitting of a heavy nucleus, Plutonium (Pu), into smaller nuclei, Zirconium (Zr) and an unknown nuclei.

The law of conservation of matter states that matter can neither be created nor destroyed hence in other to get the missing atom, we must know the total number of subscripts (mass number) and superscripts (atomic number) on both sides.

The total mass number on the reactant side is 239 + 1 = 240

The total atomic number on the reactant side is 94 + 0 = 94

While, The total mass number on the product side is 100 + 2(1) = 102

The total atomic number on the product side is 40 + 2(0) = 40

To determine the missing atom, you subtract the the total atomic number of the product from that on the reactant side; 94 - 40 = 54

The atom with the atomic number 54 is Xenon,

To determine the mass number of the xenon isotope involved, you subtract the the total mass number of the product from that on the reactant side; 240 - 102 = 138.

Hence, the particle that completes the equation is ¹³⁸₅₄Xe, the first option

Answer: A on edge

Explanation:

the person above me explained it well but i wanted to shorten it.

Answer:

I think it’s D.

Explanation:

An atom does not have a different amount of protons and electrons if there is no change... During ionisation you either lose or gain electrons, so when that happens (a change) it will have a different number.

Answer:

electrons/electron density

Explanation:

The branch of science that deals with electrons are called chemistry. An element consists of electrons, protons, and neutrons.

The correct answer to the question is electrons density.

In the cloud model,  the electrons are revolving around the nucleus. In an atom when the electron's density is very high which represents a cloud.

Hence, the correct answer is electrons.

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Given parameters:

Number of moles of iron = 0.251 moles

Unknown:

Number of atoms = ?

Solution:

A mole of an atom contains the Avogadro's number of particles;

   Avogadro's particles  = 6.02 x 10²³ atoms

     1 mole of atom  =  6.02 x 10²³ atoms

      0.251 moles = 0.251 x 6.02 x 10²³    = 1.51 x 10²³ atoms

The number of atoms here is  1.51 x 10²³ atoms

The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].

The number of atoms in a mole of sample has been given by the Avogadro law. According to the Avogadro law, the number of atoms in 1 mole of sample has been equivalent to the Avogadro number.

The Avogadro number has been a constant quantity with the value of [tex]6.023\;\times\;10^2^3[/tex].

The given mole of iron has been 0.251 mol.

The number of atoms in the sample has been given as:

[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=0.251\;\times\;6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=1.51\;\times\;10^2^3\;atoms[/tex]

The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].

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