The Lewis dot diagram for LiBr

Answer:

b. electronegativity

Explanation:

The ability of an atom in a molecule to attract electrons is best quantified by the _Electronegativity_.

Electronegativity is the ability of an atom to attract a shared pair of electron which is loosely held. Polar molecules often possess such properties. The Halogen group (group 17) is famous for such property because it has the highest electronegativity in periodic table.  

One mole of an atom of a substance is equal to the  gram molecular mass of the element. Therefore, the correct option is option B among all the given options.

A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.

A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants. One mole of an atom of a substance is equal to the  gram molecular mass of the element.

Therefore, the correct option is option B among all the given options.

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Answer:

x=51.66

Explanation:

1 ml = 1 gram

(mass) (Δt) (Cp) = (mass) (Δt) (Cp)

Substituting values into the above, we then have:

(25)(25-x)(4.184)=(50)(x-65)(4.18)

Solve for x

x= 51.6667

The final temperature is "51.67°C".

According to the question,

At 65°C,

= [tex]\frac{50}{50+25}[/tex]

= [tex]\frac{50}{75}[/tex]

= [tex]0.66667[/tex]

At 25°C,

= [tex]\frac{25}{50+25}[/tex]

= [tex]\frac{25}{75}[/tex]

= [tex]0.33333[/tex]

By multiplying the volume fractions, we get

→ [tex]65^{\circ} C\times 0.66667[/tex] = [tex]43.3334^{\circ}C[/tex]

→ [tex]25^{\circ} C\times 0.33333[/tex] = [tex]8.3333325^{\circ} C[/tex]

hence,

The final temperature will be:

= [tex]43.33334+8.333325[/tex]

= [tex]51.6666^{\circ}C[/tex]

or,

= [tex]51.67^{\circ} C[/tex]

Thus the above answer is right.

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Answer:

si

Explanation:

the answer is D) 18 electrons

Answer:

Scanning Objective Lens (4x)

Low Power Objective (10x)

High Power Objective Lens (40x)

Explanation:

Answer:

Elements in the same period have the same number of electron shells.

Explanation:

elements gain electrons and protons and become less metallic

Answer: Atoms that make up reactants rearrange into new products

Explanation:

A chemical reaction is the process of breaking down the chemical bonds of the reacting substances  which are commonly called as reactants and making new bonds to form new substances commonly called as products.

The products will contain the same atoms as there are in the reactants but the bonds will rearrange to form different substances.

Every chemical reaction is accompanied with absorption or release of energy.

Mass : 846.268 g

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

[tex]\tt mol=\dfrac{mass}{MW}[/tex]  

mass of Al₂O₃ :

MW 101,96 g/mol

mass=mole x MW

[tex]\tt 8.3\times 101.96=846.268~g[/tex]

Answer:

true

Explanation:

After ice melts into liquid water, you can refreeze it into solid ice if the temperature drops. Freezing and melting are physical changes. The substances produced during chemical changes however cannot easily change back into the original substances.

Answer:

a. H and P

Explanation:

A covalent bond is formed between 2 nonmetals, which share pairs of electrons to complete the octet in their valence shells. The polarity of the bond depends on the difference in electronegativity between both atoms. If ΔEN = 0, the bond is nonpolar. If ΔEN > 0, the bond is polar.

Which of the following set of atoms has a nonpolar covalent bond?

a. H and P . YES. H and P are nonmetals and ΔEN = |EN(H)-EN(P)|=|2.1-2.1|=0.

b. N and C . NO. ΔEN = |EN(N)-EN(C)|=|3.0-2.5|=0.5.

c. Li and O. NO. Li is a metal and O is a nonmetal.

d. Cl and Ca. Ca is a metal and Cl is a nonmetal.

Explanation:

Molten sodium chloride is able to conduct electricity due to the presence of free mobile ions in solution or the molten state.

The free mobile ions are the carriers of electricity.

Answer:

IODINE

Explanation:

 The sublevel notation of the element:

      1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵

To find this element, we must add the powers of the each of the sublevels. This is the number of electrons in the orbital of the atom.

 2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 10 + 5  = 53

  This give atom has 53 electrons and we can assume it to have an atomic number of 53.

The element is IODINE

Answer:

Ca2 solid state

H2O liquid state

Ca(OH)2 I believe this would be in solid state

H2 gas state

Explanation:

Answer:

619.465 kilometers

Explanation:

1609 m = 1 mile

so 385 miles is equal to 619465 meters (385 x 1609= 619465)

1000 meters = 1 km

so 619465 meters is 619.465 kilometers

Answer:

true

Explanation:

The volume of the liquid = 8.7 ml

Graduated cylinder is a laboratory tool used to measure the volume of liquid

Also called a measuring cylinder

Each line (marked line) on this cylinder shows a scale that shows the total volume of water.

The reading is based on a curve of the fluid formed called the meniscus. Read the measurement of the amount of fluid at the bottom of the meniscus (the position of our eyes is parallel to the level of the meniscus and the cylinder is located in a flat (not tilted) place

If we look at the picture (attached), the meniscus is located between the scale / line 8.6 and 8.8(interval 0.2 ml), so the volume of the liquid shows the number 8.7 ml

C.  the square root of the mass of the particles.

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or  

the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

or  

[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]

From this equation shows that the greater the mass of the gas, the smaller the effusion rate of the gas and vice versa, the smaller the mass of the gas, the greater the effusion velocity.

So if both gases are at the same temperature and pressure, the above formula can apply

The given question is incomplete. The complete question is:

Atom a and atom b have the same number of protons and neutrons but they do not have the same number of electrons. What statement describes the atoms?

The atoms have the same chemical symbol.

The atoms have the same charge.

The atoms have different atomic numbers.

The atoms have different atomic masses.

Answer:  The atoms have the same chemical symbol.

Explanation:

Atomic number is equal to the number of protons for any neutral or charged specie and is specific to a particular element.  Thus two elements having same atomic number will have same chemical symbols.

Mass number is the sum of number of protons and the number of neutrons.

As atoms a nd b have same protons and neutrons , they will have same atomic number and same mass number. But as the number of electrons are different , the charge on them will be different.

Thus the correct statement is the atoms have the same chemical symbol.

Answer:

They have the same chemical symbol

Explanation:

Answer:

H2 to O2

H2 to H2O

H20 to O2

H2O to H2

O2 to H20

O2 to H2

Explanation:

Answer:

Mn(IV): 3 outer-shell d electrons

Co(III): 6 outer-shell d electrons

Fe(II): 6 outer-shell d electrons

Ni(II): 8 outer-shell d electrons

Explanation:

Mn(IV):

The ion is Mn⁴⁺, so it has lost 4 valence electrons. The ground state electronic configuration of Mn is [Ar]3d ⁵ 4s ². When the neutral atom loses 4 electrons, the electronic configuration is [Ar]3d ³.

outer-shell d electrons = 3

Co(III):

The ion is Co³⁺, so it has lost 3 valence electrons. The ground state electronic configuration of Co is [Ar]3d ⁷4s ². When the neutral atom loses 3 electrons, the electronic configuration is [Ar]3d ⁶.

outer-shell d electrons = 6

Fe(II):

The ion is Fe²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Fe is [Ar]3d ⁶4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁶.

outer-shell d electrons = 6

Ni(II):

The ion is Ni²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Ni is [Ar]3d ⁸4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁸.

outer-shell d electrons = 8

The d electron in the outer shell of each of the transition metal are:

Mn(IV): 3 d electrons in the outer shell.

Co(III): 6 d electrons.

Fe(II): 6 d electrons.

Ni(II): 8 d electrons.

Electronic configuration is the arrangement of the electrons of an atom.

There are subshell s, p, d, f.

The electrons are arranged in these subshells.

Each element has different arrangement of electrons.

Thus, the number of d electron in each of the element is: Mn(IV) :3, Co(III) :6, Fe(II) :6, Ni(II) :8.

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Answer:

1.2 × 10²⁴ molecules NH₃

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

34 grams NH₃

Step 2: Define conversions

Avogadro's Number

Molar Mass of N - 14.01 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of NH₃ - 14.01 + 3(1.01) = 17.04 g/mol

Step 3: Convert

[tex]34 \ g \ NH_3(\frac{1 \ mol \ NH_3}{17.04 \ g \ NH_3} )(\frac{6.022 \cdot 10^{23} \ molecules \ NH_3}{1 \ mol \ NH_3} )[/tex] = 1.20157 × 10²⁴ molecules NH₃

Step 4: Check

We are given 2 sig figs. Follow sig fig rules.

1.20157 × 10²⁴ molecules NH₃ ≈ 1.2 × 10²⁴ molecules NH₃

Answer:

crest

Explanation:

Answer:

B

Explanation:

Answer:

B.

radiant ---> thermal

Explanation:

Mass of K₂SO₄ : 1.75 g

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

volume of solution = 25 ml

% (m/v)=7%

mass of K₂SO₄ :

[tex]\tt \%m/v=\dfrac{mass~of~solute}{volume~of~solution}\times 100\%\\\\7\%=\dfrac{mass~K_SO_4}{25}\times 100\%\\\\mass~K_2SO_4=7\times 25\div 100=1.75~g[/tex]

Answer:

This question is incomplete but the completed question is in the attachment below. And the correct is b

Explanation:

Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.

From the description above, it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead with the specific heat capacity of 0.129 J/(g. °C).

Answer:

answer is c or fuel

Explanation:

Answer:

Scientists define temperature with certain rules like the measure of the ability of a substance, or more generally of any physical system, to transfer heat energy to another physical system. The temperature of a substance is closely related to the average kinetic energy of its molecules.

Explanation:

Scientists define temperature as a measure of the average kinetic energy of the particles in a substance. In simpler terms, it reflects how fast the particles are moving within a material.

When an object is heated, its particles gain kinetic energy, leading to an increase in temperature. On the other hand, cooling reduces the average kinetic energy and results in a decrease in temperature.

Temperature is typically measured using various scales, such as Celsius, Fahrenheit, and Kelvin. Kelvin is the most commonly used scale in scientific applications since it is an absolute temperature scale, starting from absolute zero, where particles have minimal kinetic energy.

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