All atoms of the same element have the same number of protons. Magnesium has the atomic number 12, so both atoms have 12 protons in their nucleus. As long as both are of the same isotope of magnesium (have the same sum of protons and neutrons), they both will have the same number of neutrons. Regardless, the neutrons do not influence their charges, so the number of neutrons does not make much of a difference at this level. The difference between the two is their charge. Since a charge difference only happens by a change in electrons, the negatively charged particles, their number of electrons must be different. The charge equals: (number of protons) - (number of electrons) = charge
Therefore, since both particles have 12 protons, the neutral atom has:
#protons - #electrons = 0
12 - #electrons = 0
number of electrons = 12 in the neutral magnesium atom
In a positively charged ion, the equation is:
#protons - #electrons = 2
12 = 2 + #electrons
#electrons = 10 in the 2+ charged magnesium atom
The reform reaction between steam and gaseous methane (CH4) produces "synthesis gas," a mixture of carbon monoxide gas and dihydrogen gas. Synthesis gas is one of the most widely used industrial chemicals, and is the major industrial source of hydrogen.
Suppose a chemical engineer studying a new catalyst for the reform reaction finds that 924 liters per second of methane are consumed when the reaction is run at 261°C and 0.96atm. Calculate the rate at which dihydrogen is being produced. Give your answer in kilograms per second. Round your answer to 2 significant digits.
Answer: The rate at which dihydrogen is being produced is 0.12 kg/sec
Explanation:
The balanced chemical equation is ;
According to ideal gas equation:
P = pressure of gas = 0.96 atm
V = Volume of gas = 924 L
n = number of moles
R = gas constant =
T =temperature =
According to stoichiometry:
1 mole of methane produces = 3 moles of hydrogen
Thus 20.2 moles of methane produces = 
moles of hydrogen
Mass of hydrogen =
Thus the rate at which dihydrogen is being produced is 0.12 kg/sec
Answer : The correct match is:
(1) → (k)
(2) → (j)
(3) → (f)
(4) → (d)
(5) → (e)
(6) → (g)
(7) → (a)
(8) → (i)
(9) → (l)
(10) → (c)
(11) → (b)
(12) → (h)
Explanation :
Physical property : It is defined as a change in which the identity of substance does not change.
Physical change : It is defined as something observed while keeping the identity of the substance the same.
Homogeneous mixture : It is defined as something made up of at least two different substances and is usually very difficult to separate. Even distribution of particles.
Heterogeneous mixture : It is defined as something made up of at least two different substances and easily separated by physical means. Unequal distribution of particles.
Chemical property : It is defined as something observed by changing the identity of a substance.
Compound : It is defined as a pure substance made up of at leat two different elements.
Matter : It is defined as anything that has matter and takes up space.
Chemical change : it s defined as a change that creates a new substance or compound.
Extensive property : It is defined as a property that change with the amount of matter present.
Mass : It is defined as the amount of matter contained in an object.
Volume : It is defined as the amount of space a substance takes up.
Intensive property : It is defined as a property that does not change with the amount of matter present.
Is there a picture for it??
