Classify the following as homogeneous and heterogeneous mixtures.
a) soda water b)milk c) air d) soil e) blood

Homogeneous mixture    

a) Soda Water  

b)Milk        

c) Air          

Heterogeneous mixture

d) Soil

e) Blood                                        

c) Air

Explanation:

Mixture:

mixture is made up of different atoms and can be separated into its component by physical mean.

•The properties of the mixture are not same and contains the properties of all those component present in it.

•mixture is a combination of one or more Pure substances and can be separated by simple physical methods.

•it have varying boiling and melting point.

There are two types of mixture

Homogeneous mixture and heterogeneous mixture

Homogeneous mixture:

It have same uniform appearance and the different components cannot be distinguished by naked eye.

Heterogeneous mixture:

It do not have uniform appearance and the different components of the mixture can be distinguished and observed by naked eye.

Classification of the given mixtures

      Homogeneous mixture                          Heterogeneous mixture

           a) Soda Water                                                   d) Soil

           b)Milk                                                                 e) Blood                                        

           c) Air

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.