Question Text
Question 1 :
What is the SI prefix for $10^{-12}$ multiples and submultiples of a unit?
Question 7 :
What is the element used by Rutherford during his $\alpha$ - scattering experiment?
Question 8 :
Find the ratio by mass of the combining elements of compound $CaCO_3$.
Question 10 :
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is $24g mol^{-1}$.
Question 12 :
Which of the following correctly represents 360 g of water? (i) 2 moles of $H_2O$ (ii) 20 moles of water (iii) $6.022\times 10^{23}$ molecules of water (iv) $1.2044\times 10^{25}$ molecules of water
Question 18 :
Calculate the number of molecules of sulphur ($S_8$) present in 16 g of solid sulphur.
Question 19 :
What is the SI prefix for $10^{-9}$ multiples and submultiples of a unit?