6. Composition of matter

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Name *

School Name *

A ________Milk is a mixture of water, lactose, fats, protein and a few more natural substances. *

2 points

mixture

compound

A mixture Milk is a mixture of _______, protein and a few more natural substances. *

2 points

water

All the above

fats

lactose

The proportion of various ingredients of milk is different as per its source. *

2 points

false

true

The proportion of fats in cow milk is 3-5 %, while it is 6-9 % in buffalo milk. *

2 points

false

true

The ingredient _____is naturally present in large proportion in milk. Therefore milk exists in liquid state. *

2 points

air

none

both

water

The sweetness of milk is due to the ingredient called ______. *

2 points

lactose

sweet milk

none

lotus

Element has different physical properties like_____? *

2 points

All the above

lustre/paleness

malleability / brittleness

none

Elements were classified into 'Metals' and 'Non metals'. *

2 points

false

true

what is types of elements? *

2 points

metalloid

metals

All the above

non-metals

when such compounds are strongly heated in air, combine with oxygen to form some gaseous substances. In case their combustion is not complete, black coloured carbon remain behind as residue. These compounds are called________? *

2 points

inorganic compounds

none

organic compounds

complex compounds

_______are made of organic compounds. *

2 points

petrol, cooking gas

All the above

carbohydrates, proteins

hydrocarbons

The compounds that decompose on strong heating to leave a residue behind are________. *

2 points

complex compounds

carbon compounds

organic compounds

inorganic compounds.

______are inorganic compounds. *

2 points

rust, blue vitriol

All the above

limestone

salt, soda

The molecules of compounds have a complex structure formed by many atoms and in the centre of this structure metal atoms are also included. *

2 points

false

true

complex compounds are ___? *

2 points

All the above

Chlorophyll that contains magnesium

cyanocobalamine (vitamin B-12) that contain cobalt

hemoglobin that contain iron

Various atoms in the molecules of compounds are joined by chemical bonds. *

2 points

true

false

The part of matter having uniform composition is called _____ *

2 points

phase

heterogeneous mixture

homogeneous mixture

none

When all the components of a mixture form one phase, it is called ___________. *

2 points

heterogeneous mixture

homogeneous mixture

phase

none

When the components of a mixture are distributed into two or more phases it is called a _________. *

2 points

phase

heterogeneous mixture

none

homogeneous mixture

All the particles of a solid that stay together (or are in the same container)constitute a single phase in a heap of stones.. *

2 points

true

false

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