Most favourable conditions for electrovalency are
(a) Low charge on ions, large cation and small anion
(b) High charge on ions, small cation and large anion.
(c)X High charge on ions, large cation and small anion
(d) Low charge on ions, small cation and large anion
bila da​

Answer:

the anser is c

Explanation:

Answer:

D= 109.5 degrees, 109.5 degrees, 120 degrees

Explanation:

The bond angle observed for any bond between two chemical species depends on the hybridization of the atoms.

However, for organic compounds, single bonds normally involve sp3 hybridized atoms with a bond angle of 109.5 degrees such as in the positions marked a and b.

However, a double bond is made of atoms in sp2 hybridized state with a bond angle of 120 degrees such as in c.

Answer:

See explanation

Explanation:

Average heart beat = Number of heart beats/ time

7.0 years = 7.0 * 365 * 24 * 60 = 3679200 minutes

If there are 69 beats in 1 minutes

There are x beats in 3679200 minutes

x = 253865 beats

x = 254000.00 beats ( to 3 sf)

beats in 7.00 years = 254000.000 beats

beats in 7.000 years = 254000.0000 beats

When NH₃(aq) is added to Cu₂(aq), a precipitate initially forms. Its formula is Cu(NH₃)². The correct option is d.

A chemical formula is a representation of chemical elements and chemical compounds. The chemical letters are used to write the chemical formula. The charges if present is written by charges symbols like plus, minus.

The chemical reaction is

NH₃(aq) + Cu₂(aq) = Cu(NH₃)²

This is called a chemical reaction, which contains reactant on the left side and products on the right side. The precipitate that is formed is copper ammonia whole twice.

Precipitation is the solid crystals' substance that is come out at the surface of the liquid. It is collected in solid form, and it is called a precipitate.

Thus, the correct option is d. Cu(NH₃)².

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Answer:

Specific heat capacity of copper is 0.385 J/g.°C

Explanation:

Given data:

Specific heat capacity of copper = ?

Heat absorbed by copper = 57.8 J

Mass of copper = 10 g

Temperature changes = 15°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

by putting values

57.8 J = 10 g × c × 15°C

57.8 J = 150 g.°C × c

c = 57.8 J / 150 g.°C

c = 0.385 J/g.°C

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Specific heat capacity of copper is 0.385 J/g.°C.

Answer:

700N

Explanation:

F=ma

mass=35

acceleration =20

Answer:

85 ml

Explanation:

move the decimal place over two times

Answer:

1 mole of sodium chloride( NaCl)

=58.4g/mol

1 mole of nitrogen

=14.0g/mol

The balls of the Newton’s cradle eventually stop because they loose energy as they collide.

The balls of the Newton’s cradle lose energy to the air as they move through it due to friction.

These balls make sound when they collide, and consequently the balls loose energy to heat upon collision.

The balls loose energy as they collide with each other and eventually stop.

Thus, we can conclude that the balls of the Newton’s cradle eventually stop because they loose energy as they collide.

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Answer:

0.56 g

Explanation:

A chemist determines by measurements that 0.020 moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen gas that participates.

Step 1: Given data

Moles of nitrogen gas (n): 0.020 mol

Step 2: Calculate the molar mass (M) of nitrogen gas

Molecular nitrogen is a gas formed by diatomic molecules, whose chemical formula is N₂. Its molar mass is:

M(N₂) = 2 × M(N) = 2 × 14.01 g/mol = 28.02 g/mol

Step 3: Calculate the mass (m) corresponding to 0 0.020 moles of nitrogen gas

We will use the following expression.

m = n × M

m = 0.020 mol × 28.02 g/mol

m = 0.56 g

Answer:

Barium chloride is represented as BaCl2.

Explanation:

so answer is a.)2

I hope it's helpful!

Answer:

The 91.8% is present as bicarbonate ion

Explanation:

It is possible to find pH of a buffer using H-H equation:

pH = pKa + log [A⁻] / [HA]

Where pH is 7.40; pKa is 6.36, [A⁻] is concentration of bicarbonate ion and [HA] concentration of carbonic acid

7.40 = 6.35 + log [A⁻] / [HA]

1.05 = log [A⁻] / [HA]

11.22 = [A⁻] / [HA] (1)

As the question is in therms of percentage:

[A⁻] + [HA] = 100 (2)

Replacing (2) in (1):

11.22 = [A⁻] / 100 - [A⁻]

1122 - 11.22[A⁻] = [A⁻]

1122 = 12.22[A⁻]

91,8% = [A⁻]

Answer:

The new pressure is 1,135.67 torr

Explanation:

Boyle's law establishes the relationship between pressure and volume of a gas when the temperature is constant, establishing that the pressure of a gas in a closed container is inversely proportional to the volume of the container. Mathematically, this law says that the product of pressure and volume is constant:

P*V=k

Charles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law states that the volume is directly proportional to the temperature of the gas. So, Charles's law says that the quotient that exists between the volume and the temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Finally, Gay-Lussac's Law is a gas law that relates pressure and temperature at constant volume. This law says that the pressure of the gas is directly proportional to its temperature:

[tex]\frac{P}{T} =k[/tex]

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{P*V}{T} =k[/tex]

Analyzing an initial state 1 and a final state 2, it is satisfied:

[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{662 torr*46.7 L}{266 K} =\frac{P2*35 L}{342 K}[/tex]

Solving:

[tex]P2=\frac{342 K}{35 L} *\frac{662 torr*46.7 L}{266 K}[/tex]

P2= 1,135.67 torr

The new pressure is 1,135.67 torr

no why

anser;

explinaton;

Answer: Fluorine

Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.

Answer:

Fluorine.

Explanation:

I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.

Answer: Avogrado's Constant

Explanation:

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.

Answer: I think its 32 I'm not sure

Explanation:

Answer:

a.

[tex]M_{CaBr_2}=40.08+79.9*2=199.88 g/mol[/tex]

b.

[tex]M_{BeBr_2}=9.012+79.9*2=168.81g/mol[/tex]

c.

[tex]M_{CdBr_2}=112.41+79.9*2=272.21g/mol[/tex]

d.

[tex]M_{CuBr_2}=63.55+79.9*2=223.35g/mol[/tex]

Explanation:

Hello!

In this case, since the molar mass of a compound is computed by adding the molar mass of each element composing it and multiplying it by the number of atoms in the molecule, we have:

a.

[tex]M_{CaBr_2}=40.08+79.9*2=199.88 g/mol[/tex]

b.

[tex]M_{BeBr_2}=9.012+79.9*2=168.81g/mol[/tex]

c.

[tex]M_{CdBr_2}=112.41+79.9*2=272.21g/mol[/tex]

d.

[tex]M_{CuBr_2}=63.55+79.9*2=223.35g/mol[/tex]

Best regards!

Answer:

5.90x10²² atoms of gold are present in the cube

Explanation:

First, we must find the volume of the cube in cm³. With density we can find the mass of the gold and the moles using its molar mass. As 1 mol = 6.022x10²³ atoms we can find the number of atoms:

Volume in cm³:

(10.0mm)³ = 1000mm³

1mm³ = 0.001cm³

1000mm³ * (0.001cm³ / 1mm³) = 1cm³

Mass gold:

1cm³ * (19.3g/cm³) = 19.3g Gold

Moles Gold:

19.3g * (1mol / 197.0g) = 0.0980 moles Gold

Atoms gold:

0.0980 moles Gold * (6.022x10²³ atoms / mol) =

Answer:

Explanation:

We define lattice energy as "the change in internal energy that accompanies the formation of one mole of the solid from its constituent gas phase ions." (Housecroeft and Sharpe, 2012).

Also, lattice energy depends on the size of the ions. In this case, the anion is the same so we consider the relative sizes of the cations. The smaller the size of the cation, the greater the quantitative value of the lattice energy.

Since Ca^2+ is smaller than K^+, the quantitative value for the lattice enthalpy of calcium bromide is larger than the value for the lattice enthalpy of potassium bromide.

Answer:

a. 0.80 m³/kg

b. 0.67 m³/kg

Explanation:

a.

Step 1: Given data

Volume of the container (V): 20 m³

Mass of methane (m): 25 kg

Step 2: Calculate the specific volume (v) of methane

Specific volume is defined as the number of cubic meters occupied by one kilogram of matter.

v = V/m

v = 20 m³/25 kg = 0.80 m³/kg

b.

Step 1: Calculate the mass of the mixture

m = m(methane) + m(ethane)

m = 25 kg + 5 kg = 30 kg

Step 2: Calculate the specific volume (v) of the mixture

v = V/m

v = 20 m³/30 kg = 0.67 m³/kg

Answer:

302 kj heat is released by lowering the temperature

302kJ is the amount of heat which is released by lowering the temperature of 825 grams of molten (liquid) lead at 800K to solid lead at 295K. Therefore, the correct option is option C.

Heat is energy that is transmitted from one object to another as a result of a temperature differential. When two bodies of differing temperatures come into contact, energy is transmitted as heat flows first from hotter to the colder.

melting point of lead= 328°C.

T₁ = 328 + 273 = 800K

T₂ = 295K

T₃ = 600.61K

latent head of fusion of lead = 4.8 kJ/mol

specific heat of solid lead= 0.13 J/g/K

specific heat of liquid lead = 0.14 J/g/K

heat= mS∆T + (m/M)Lf + mS∆T'

= 23g × 0.13 J/g/K × (601 - 297)K + 23g/207g/mol × 4.8 kJ/mol + 23g × 0.14 J/g/K × (702 - 601)K

=302kJ

Therefore, the correct option is option C.

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Answer:

Explanation:

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).  

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1. Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f. In the sub-level s there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.

In other words, the difference between the sub-levels consists of the number of electrons that it can hold at each level. In each sublevel there are a certain number of orbitals [1 orbital describes the rotation of a maximum of two electrons around the nucleus] that can contain a maximum of 2 electrons each. In this way, the maximum number of electrons that each sublevel admits is: 2 in the s; 6 in the p (2 electrons x 3 orbitals); 10 in the d (2 electrons x 5 orbitals); 14 in the f (2 electrons x 7 orbitals).

Answer:Cs2O + H2O —> 2CsOH [2Cs+ + 2OH-]

Explanation: Cs is the most electropositive element, with electron structure [Xe] 6s1.

Answer:The majority of chemical processes are reactions that occur in solution. Important industrial processes often utilize solution chemistry. "Life" is the sum of a series of complex processes occurring in solution. Air, tap water, tincture of iodine, beverages, and household ammonia are common examples of solutions.

A solution is a homogenous mixture of substances with variable composition. The substance present in the major proportion is called the solvent, whereas the substance present in the minor proportion is called the solute. It is possible to have solutions composed of several solutes. The process of a solute dissolving in a solute is called dissolution.

Explanation:

Answer:

potassium chloride (KCl)

Explanation:

The reaction between aqueous potassium hydroxide and aqueous iron (III) hydroxide is a double replacement reaction.

3 KOH + FeCl₃ → 3 KCl + Fe(OH)₃

Hope that helps.

Answer:

The correct answer is

[tex]Fe(OH)_{3}[/tex]

Explanation: I tried the KCI and it was incorrect but it showed the answer so here you go!

Answer:

ummmmm huh?

Explanation:

.......im confused on the question

Answer:

odd

Explanation:

By applying the Nitrogen rule; A molecular ion with odd mass numbers will contain an odd number of a nitrogen atom, however, a molecular ion with an even mass number will contain either an even number of a nitrogen atom or no nitrogen.

So from the given information, the missing word is odd .

Terri and Ernesto should both use geographic maps.

may i have brainliest? :D

Answer:

C.

Explanation:

I dunno. took the test and got it right.