(a) iodine crystals 1 pure substance homogeneousmixture heterogeneous mixture (b

Question

(a) iodine crystals 1 pure substance
homogeneousmixture    
heterogeneous mixture

(b) iodine solution 2 pure substance
homogeneousmixture    
heterogeneous mixture

(c) ethanol
pure substance
homogeneousmixture    
heterogeneous mixture

Read the following description of the element zinc, and indicatewhich are physical properties and which are chemicalproperties.

Zinc is a silver-gray colored metal. 1 physical
chemical    

Zinc melts at 420°C. 2 physical
chemical    

When zinc granules are added to dilute sulfuric acid, hydrogen isgiven off and the metal dissolves. 3 physical
chemical    

Zinc has a hardness on the Mohs scale of 2.5. 4 physical
chemical    

Zinc has a density of 7.13 g/cm3 at 25°C. 5 physical
chemical    

Zinc reacts slowly with oxygen gas at elevated temperatures to formzinc oxide, ZnO.
6 physical
chemical    
1 pure substance
homogeneousmixture    
heterogeneous mixture
1 pure substance
homogeneousmixture    
heterogeneous mixture
1 2 pure substance
homogeneousmixture    
heterogeneous mixture
2 pure substance
homogeneousmixture    
heterogeneous mixture
2 1 physical
chemical    
1 physical
chemical    
1 2 physical
chemical    
2 physical
chemical    
2 3 physical
chemical    
3 physical
chemical    
3 4 physical
chemical    
4 physical
chemical    
4 5 physical
chemical    
5 physical
chemical    
5 6

Explanation / Answer

(a) Iodine crystals are pure substance assumuing zero percentimpurities. (b)   Iodine solution is a homgeneous mixture(completely misicible mixture of Iodine ans solvent) (c)   Ethanol is pure substance as it does notcontain any other substance color is a physical property melting point is a physical property evaluation of hydrogen gas is a chemical process Hardness is a physical property Density is a physical property Formation os ZnO is a chemical process

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