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3 years ago

The atomic number is the number of _____ an atom

Chemistry

2 answers:

Sveta_85 [38]3 years ago

5 0

The atomic number is the number of protons of an atom.

ololo11 [35]3 years ago

3 0

The Rutherford–Bohr model of the hydrogen atom (Z = 1) or a hydrogen-like ion (Z > 1). In this model it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron jumps from one orbital to another, be proportional to the mathematical square of atomic charge (Z2). Experimental measurement by Henry Moseley of this radiation for many elements (from Z = 13 to 92) showed the results as predicted by Bohr. Both the concept of atomic number and the Bohr model were thereby given scientific credence. The atomic number is the number of _z_ an atom.

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O que são processos físicos de separação das misturas? Dê 3 exemplos

chubhunter [2.5K]

Answer:

Explanation:

The physical methods of separating mixtures are used in sorting a mixture of substances.

It requires no chemical changes occurring between their components and parts in any significant way.

Examples are:

Decantation
Filtration
Sublimation
Magnetism
Centrifugation

The methods simply relies on the physical properties of matter.

8 0

3 years ago

Semimetals is a term which refers to

SCORPION-xisa [38]

I guess you could call them that. In chemistry, we call them Metalloids though.

5 0

3 years ago

Two identical bottles at the same temperature contain the same gas. If bottle B has twice the volume and contains half the numbe

yuradex [85]

Answer:

The ratio of pressure in bottle B to that of bottle A is 1 : 4

Explanation:

We'll be by calculating the pressure in both bottles. This is illustrated below below:

For A:

Temperature (T) = T

Volume (V) = V

Number of mole (n) = n

Gas constant (R) = 0.0821 atm.L/Kmol

Pressure (P) =...?

PV = nRT

PV = n x 0.0821 x T

Divide both side by V

P = nT0.0821/V

Therefore, the pressure, in bottle A is

PA = nT0.0821/V

For B:

Temperature (T) = the same as that of A = T

Volume (V) = twice that of A = 2V

Number of mole (n) = half that of A = ½n

Gas constant (R) = 0.0821 atm.L/Kmol

Pressure (P) =...?

PV = nRT

P x 2V = ½n x 0.0821 x T

Divide both side by 2V

P = ½n x 0.0821 x T/2V

P = nT0.0821/4V

Therefore, the pressure in bottle B is:

PB = nT0.0821/4V

Now, we can obtain the ratio of pressure in bottle B to that of bottle A as follow:

Pressure in bottle A (PA) = nT0.0821/V

Pressure in bottle B (PB) = nT0.0821/4V

PB/PA = nT0.0821/4V ÷ nT0.0821/V

PB/PA = nT0.0821/4V x V/nT0.0821

PB/PA = 1/4

Therefore, the ratio of pressure in bottle B to that of bottle A is 1 : 4.

3 0

3 years ago

If the pressure is doubles and the temperature is held constant what will happen to the volume of a gas?

Tresset [83]

Answer:

Explanation:

Of course increasing the pressure will reduce the volume

P1V1 = P2V2

P1V1/P2 = V2 WHEN P2 = 2 P1----multiply both sides by 1/2

P1 V1 / 2P1 = 1/2 V2 <===== 1/2 the original

8 0

2 years ago

What information does the rate constant give from the rate law? A. It tells how much the rate of the reaction is affected by vol

Levart [38]

From the rate law, the information that is given by the rate constant is: C. It tells how much the reaction rate is affected by activation energy.

Rate law is also referred to as rate equation and it can be defined as a chemical equation that is typically used to relate the initial (forward) chemical reaction rate with respect to the concentrations or pressures of the chemical reactants and constant parameters.

Mathematically, the rate law is given by this formula:

$R = k[A]^x[B]^y$

<u>Where:</u>

k is the rate constant.

A is the concentration of reactant A.

B is the concentration of reactant B.

In Chemistry, the rate constant is typically used to tell the reaction rate or rate of a chemical reaction that is affected by activation energy.

Read more on rate constant here: brainly.com/question/24749252

7 0

2 years ago