potassium atom (atomic number 19) and a bromine atom (atomic number 35) can form a chemical bond through a transfer of one electron. The potassium ion that forms has 18 electrons. What best describes the bromide ion that forms? It is a negative ion that has one less valence electron than a neutral bromine atom. It is a positive ion that has one less valence electron than a neutral bromine atom. It is a negative ion that has one more valence electron than a neutral bromine atom. It is a positive ion that has one more valence electron than a neutral bromine atom.

Answer: distillation

Explanation:

Answer:

Substance X has a smaller mass

Explanation:

The relationship between the mass of the two samples is that the mass of X is smaller compared to the mass of Y.

 The specific heat capacity is given as:

         C  =

We can see that the higher the specific heat capacity the lesser the mass or simply put, the specific heat capacity of a body is inversely related to its mass.

If the amount of heat is constant i.e the same and the specific heat capacity of X is twice that of Y, then substance X has a smaller mass

Final answer:

The relationship between the masses of Substance X and Substance Y is mx : my = (cY) : (cX), which means that the ratio of their masses is equal to the inverse of the ratio of their specific heat capacities.

Explanation:

To determine the relationship between the masses of Substance X and Substance Y, we can use the equation Q = mcΔT, where Q represents the amount of heat added, m represents the mass of the substance, c represents the specific heat capacity, and ΔT represents the change in temperature.

Let's assume that the same amount of energy is added to both Substance X and Substance Y, resulting in the same change in temperature. Since Substance X has a specific heat capacity that is twice as large as Substance Y, we can set up the following equation:

mx(cX)ΔT = my(cY)ΔT

Canceling out ΔT on both sides of the equation, we get:

mx(cX) = my(cY)

To find the relationship between the masses, we can divide both sides of the equation by (cY) and simplify:

mx / my = (cY) / (cX)

Therefore, the relationship between the masses of Substance X and Substance Y is mx : my = (cY) : (cX), which means that the ratio of their masses is equal to the inverse of the ratio of their specific heat capacities.

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Answer:

Concentration of OH- ions will be lowered

Explanation:

NH4OH is a weak electrolyte whereas NH4Cl is a strong electrolyte. The ionization can be depicted as follows:

NH4OH ↔ NH4+ + OH-

NH4Cl → NH4+ + Cl-

Addition of NH4Cl to NH4OH introduces a common ion i.e. NH4+.

The presence of a common ion supplied by a strong electrolyte will suppress the ionization of the weak electrolyte, this is called common ion effect.

In this case, the ionization of NH4OH will be suppressed which will lower the concentration of OH- ions.

Answer:

11.0 dm³

Explanation:

From the question,

Applying

PV= nRT............... Equation 1

Where P = pressure of oxygen gas, V = volume of oxygen gas, n = number of moles of oxygen, R = molar constant, T = Temperature.

make V the subeject of the equation

V = nRT/P............. Equation 2

But,

Number of mole (n) = Mass of oxygen(m)/Molar mass of oxygen(m')

n = m/m'....................... Equation 3

Substitute equation 3 into equation 2

V = mRT/Pm'............. Equation 4

Given: T = 28°C = (28+273) = 301 K, P = 0.998 torr = (0.998×0.00131579) = 1.3132 atm, m = 18.4 g

Constant: R = 0.082 atm.dm³/K.mol, m' = 32 g/mol.

Substitute these values into equation 4

V = (301×18.4×0.082)/(32×1.3132)

V = 454.1488/42.0224

V = 10.81 dm³

V = 11.0 dm³