Answer:
D results are based on an undisclosed process or procedure
Explanation:
The atomic number is the number of protons an element has, protons are positively charged and electrons are negatively charged. All elements have no charge so the number of electrons will always equal the number of protons for an element so there are 6 electrons.
The reaction in which two reacting molecules exchange their partner ions in aqueous solution and form two new compounds.
Molar mass of CaCl2 = 40+ ( 35.5 ×2)=110
Mr of Ca(OH)2 = 40+ (16+1)×2 =74
%of Ca = (40÷ 74)×10=...
1 m = 100cm...
1cm = (1÷100) m
So 45.5 cm = 45.5 ×(1÷100) =....
1km = 1000m
1m = 100 cm
1cm =10mm
So 1km = 1000×100×10 mm
Now convert