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Molecules

Which of the ...

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Which of the following statements is true?
(a) Carbon dioxide is an element.
(b) The molecule is the smallest particle that can stand on its own.
(c) Every molecule contains two atoms.
(d) Calcium, nitrogen and oxygen are non-metals.

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Solution

(b) The molecule is the smallest particle that can stand on its own.

Molecule is the smallest particle of an element that can stand on its own. Molecules of elements contain one or more atoms of the same kind. For example, each molecule of metals such as sodium and calcium contains only one atom and are called monatomic. On the other hand, each molecule of non-metals such as oxygen, nitrogen and hydrogen consists of two atoms and are called diatomic.

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Q. State whether the statements given below are true or false. Rewrite the false statements correctly.
(a) All metals are solids at room temperature.
(b) Non-metals are good conductors of heat but poor conductors of electricity.
(c) A molecule of sodium is made of sodium atoms only, so it is an element.
(d) Compounds are made up of only one type of element.
(e) The symbol and formula of copper are the same.
(f) An atom consists of electrons, protons and neutrons.
(g) Some atoms can stand on their own.
(h) Water is called combination because it is formed by the combination of two or more substances.
(i) If two atom join together a compound is formed.
(j) The electron is a particle which is smaller than an atom.
(k) Zinc, copper, nitrogen and silver are all metals.
(l) An atom of iron can stand on its own.
(m) The molecule of a compound contains the same kind of atoms joined together.
(n) Oxygen, nitrogen and hydrogen are gases.
(o) The valency of hydrogen is one.

Q. Which is the smallest particle of an element that can take part in a chemical reaction?

(a) atom
(b) molecule
(c) radical
(d) either atom or molecule depending on the element

Q. Which is the smallest particle of an element that can take part in a chemical reaction?

(a) atom
(b) molecule
(c) compound
(d) either atom or molecule depending on the element

Q. Fill in the following blanks :
(a) 1 mole contains ...................... atoms, molecules or ions of a substance.
(b) A mole represents an ..................... number of particles of a substance.
(c) 60 g of carbon element are ................... moles of carbon atoms.
(d) 0.5 mole of calcium element has a mass of ......................
(e) 64 g of oxygen gas contains ....................... moles of oxygen atoms.

Q. Fill in the blanks choosing the correct word from those given below.
one, two, carbon, oxygen, compound(s), element(s), gas, symbol, formula, atom(s), molecule(s)
CO₂ is the _______________ of a gas called carbon dioxide, It represents one ___________ of the _______________. This compound is made up of ______________and _______________. Each molecule contains one ______________ of carbon and _________________of _______________. The _____________ C represents one ______________ of while the _______________ O represents one ________________ of ______________.

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