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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ७

Define the following term with an example. Compound

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प्रश्न

Define the following term with an example.

Compound

व्याख्या
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उत्तर

Compound: A compound is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions.

Ex: H20, NaCl.

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पाठ 3: Matter Around Us - Evaluation [पृष्ठ ३८]

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सामाचीर कलवी Science - Term 1 [English] Class 7 TN Board
पाठ 3 Matter Around Us
Evaluation | Q V. 4. b. | पृष्ठ ३८

संबंधित प्रश्‍न

MATCH THE COLUMNAS

1. Jpham  Dalton a. Neutrons
2. Atom b. Model of the atom
3. Chadwick c.The atomic theory of matter 
4. Rutherfrod d. Positively  charged 
5. Protons e. Electricity neutral 
6. Nuclear  fusion  f. Generator of electricity 
7.Gamma -rays  g. High penetrating power 
  h.Energy in sun 

TRUE \ FALSE

Cathode rays are a stream of fast moving particles that travel in random directions.


Write the names of the elements present in the:-

Sodium hydroxide


Fill in the blank

An ion with negative charge is called _______


Define: Relative atomic mass


How did Neils Bohr visualise the atom ?


Name the three subatomic particles present in an atom.


What are the building blocks of matter ?


How is the size of an atom indicated ?


What is an atom ? How do atoms usually exist ?


Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.

(Atomic masses : Al = 27 u ; Fe = 25 u)


Compare: 

Chlorine atom and chloride ion, with respect to

Atomic structure
Electrical state


A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –

  1. ammonium
  2. bisulphate
  3. carbonate

state the group of atoms present in each radical.


The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium


State true or false. If false, correct the statement.

The basic unit of an element is molecule.


Project.

To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.


Define the following term with an example.

Metalloid


What are the 3 most abundant atoms on the earth?


Atoms have a radius of the order ______.


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