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3 years ago

Can you please explain why the metal doesn't rust at b

Chemistry

1 answer:

Anna71 [15]3 years ago

7 0

(a) (i) Zinc blende is mainly Zinc sulphide and in industry it is converted to ZnO by flames to burn off the sulphur as SO2 which is then used to make sulphuric acid.

(ii) Reduction of ZnO to Zn:-

2ZnO + C = CO2 + 2Zn

(b) This is called sacrificial anodic protection. The zinc ( which is more reactive than iron) when in contact with the oxygen in the air is oxidised and in the process loses its electrons. These travel through the electrolyte to the iron. The electrons then reduce any iron oxide to iron: fe2+ + 2e ---> Fe.

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Pl help it’s for a grade I will give you Brainly

Inessa [10]

Answer:

D. B, C, A

Explanation:

A. For object A, given the following data;

Mass = 2kg

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To find the acceleration;

Acceleration = net force/mass

Acceleration = 1/2

Acceleration = 0.5m/s²

B. For object B, given the following data;

Mass = 8kg

Net force = 10N

To find the acceleration;

Acceleration = net force/mass

Acceleration = 10/8

Acceleration = 1.25m/s²

C. For object C, given the following data;

Mass = 7kg

Net force = 7N

To find the acceleration;

Acceleration = net force/mass

Acceleration = 7/7

Acceleration = 1m/s²

Therefore, placing the objects in decreasing order, according to the magnitude of the acceleration they are experiencing is B, C, A

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3 years ago

B. Why is this number called a "mass” number?

deff fn [24]

Answer:

The mass of the atom depends on the sub atomic particles present in the nucleus of an atom.

That is, the protons and the neutrons.

Electrons are present around the nucleus and the mass is negligible since its mass is very very less.

mass of a proton = $1.673\times10^{-27} kg$

mass of a neutron = $1.675 \times 10^{-27} kg$

mass of an electron = $9.109 \times 10^{-31} kg$

Mass number represents the mass of one particular isotope and it is a whole number for example, $_6 C^{13}$

Mass number is 13 and atomic number is 6 for the carbon isotope C-13.

Atomic mass is different from mass number and it is a fraction since it is the average atomic mass of all the isotopes of an atom.

Atomic mass of C is 12.011 amu which we see in the periodic table is the average atomic mass of isotopes C-12, C-13 and C-14.

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