Answer:
c. a proton
Explanation:
A neutron is most equal in mass to a proton.
A neutron is a subatomic particle without any charges on them.
A proton is a subatomic particle with a positive charge.
- the mass of a proton and neutron are the most similar in an atom.
- the mass of a proton is 1.67 x 10⁻²⁷kg
- So also is the mass of a neutron
- the mass of an electron is 9.11 x 10⁻³¹kg
Answer:
Valence electrons are important because they
The electrons that occupy the outer most shell of an atom are called valence electrons. They are important because they determine how an atom will react. By writing an electron configuration, You'll be able to see how many electrons occupy the highest energy level.
Explanation:
A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
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Answer:
c) parallel to the wire
Explanation:
The concept is based on right-hand thumb rule that states that the thumb points in the direction of the current and the fingers will represent the direction of the lines of magnetic force.
As the current is moving in the east-west direction. Using the right-hand thumb rule, the direction of the magnetic field at a point below the wire is from north to south. So, when viewed from the west end, the magnetic field at a point will be anti- clockwise.
Hence, the correct answer is "b) anti- clockwise".
79.8 g; 1
a) Mass of Fe2O3
Molar mass of Fe2O3 = (2x55.845 +3x16.00) g Fe2O3 = 159.69 g Fe2O3
Mass of Fe2O3 = 0.500 mol Fe2O3 x (159.69 g Fe2O3)/1 mol Fe2O3)
= 79.8 g Fe2O3
b) Coefficient of CaO
The balanced equation is
<u>1</u>CaO + CO2 → CaCO3
The coefficient of CaO is <em>1</em>.