Density of any substance is mass of the substance per unit volume. Density, d=m/V, where m is mass of the substance and V is the volume occupied by the substance. The amount of water displaced by an object when it is submerged in water equals the volume of the object. So, due to submerge of piece of zinc alloy in water present in graduated cylinder, water level rises. The increase in the volume of water is the volume of the zinc piece.
Volume of water in graduated cylinder before addition of zinc piece (v₁)= 20 ml, Volume of water in graduated cylinder after addition of zinc piece (v₂)= 23.2 ml, Rise in the volume due to submerge of the piece = (v₂ - v₁)ml= 23.2-20.0= 3.20 ml. So, volume of the piece is 3.20 ml and mass of the zinc piece is 25.0 g.
Hence density zinc alloy is equal to 
g/ml= 7.81 g/ml= 7.8 g/ml (expressed in two significant figure).
For numbers less than 0.1 such as 0.06, the zeros to the right of the decimal point but before the first nonzero digit show the decimal place of the first digit.
The number of significant figures in a measurement often show the degree of accuracy of the measurement. We ascertain the number of significant figures from the first non - zero digit in the figure.
Given the figure 0.06, there is only one significant figure present. The zeros to the right of the decimal point but before the first nonzero digit show the decimal place of the first digit.
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The product is magnesium sulfate plus hydrogen gas,as per this equation:
<span>Mg + H2SO4 = MgSO4 + H<span>2(g)</span></span>
Answer:
Scientists use models to study atoms because atoms are extremely small and can't even be seen. If atoms can't be seen, it's easier to study and.
Explanation:
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