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A) Double replacement
Because the reactants switch when they become products
Explanation:
1) There are three sub atomic particles; protons, neutrons and electrons. Protons and Neutrons are found in the nucleus while electrons are found in orbitals outside the Nucleus.
2) No. This is not always the case. An example is sodium which has atomic mass of 23.
Atomic Mass = Neutrons + Protons
23 = Neutrons + 11
Neutrons = 23 - 11 = 12
In sodium there are 11 protons and 12 neutrons
The sensitivity of electronic balance is 0.3 mg
Converting 0.3 mg to g:
g
So, the mass of a substance weighed on the balance can be measured accurately up to four decimal places.
Given the mass of sample is 1.2300 g. The number of significant figures in the measurement will be 5 because the balance can measure the mass of a sample accurately up to four decimal points, all the digits in the measurement will be significant.