In chemical equations the atoms of each element are represented by what?
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Numbers
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Colours
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Shapes
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Symbols
Q.2.
Elements normally exist as atoms but they can form charged particles called ions. How do they do this?
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It happens when the atoms are rubbed on a piece of fabric
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They lose or gain at least one electron
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It can only happen to them in a Van-der-Graaf machine
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They are only formed in space where there are cosmic rays
Q.3.
When atoms join together to form molecules what happens to their electrons?
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A pair of electrons is transferred from one atom to the other
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The atoms lose at least one pair of electrons
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The atoms gain at least one pair of electrons
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The atoms share at least one pair of electrons
Q.4.
Which of the following lists contains metallic elements?
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Al, CO, Fe, Mg, Au
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Na, Li, I, Zn, Fe
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Fe, Al, Na, Mg, Zn
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Cu, Pt, Fe, Ag, Br
Q.5.
Which of the following is a compound containing non-metals ?
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Sodium carbonate
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Methane
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Calcium chloride
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Iron fluoride
Q.6.
Which of the following best describes the atoms of an element?
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The atoms of an element are round
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The atoms of an element are the same color
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The atoms of an element are the same type
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The atoms of an element are solid
Q.7.
All elements and compounds are made from what?
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Atoms
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Molecules
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Ions
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Varying quantities of fire, earth, air and water
Q.8.
Elements are listed on the periodic table and can be classified as metals and non-metals. Where are they found on the periodic table?
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Metals on the right, non-metals on the left
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Metals on the left, non-metals on the right
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They are not arranged in any particular order
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The non-metals are at the center with metals around the outside
Q.9.
Which of the following lists contains the missing words from the following passage in the right order? There are over a __________ different types of atom, called __________. The atoms of a particular element are ___________ to each other. They cannot be changed ____________ into any different element. _________ are substances that contain atoms of at least two elements chemically combined.