Atoms, Molecules And Reactions: Question Preview (ID: 171)

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When measuring a substance the _____________ digit is an estimated digit.
a) first b) last c) digit before the decimal d) digit after the decimal
The particles in a snow globe represent a
a) suspension b) solution c) compound d) homogenous mixture
The nucleus was discovered by ______________ when he found that __________.
a) Mendeleev.... atomic mass increases with atomic number b) Mendeleev....atomic number increases with atomic mass c) Rutherford...... alpha particles deflected back d) Rutherford ...... gamma particles have no mass
Which scientist based periodic on atomic NUMBER?
a) Mendeleev b) Mosley c) Meyer d) Rutherford
Electrons were discovered using which piece of equipment?
a) cathode ray tube b) geiger counter c) cloud chamber d) nuclear reactor
The third period of the period table contains
a) s block only b) p block only c) s, d and f blocks d) s and p blocks
Which is NOT true of ionic compounds
a) they have a crystalline structure b) they are usually in a gaseous state c) they have high melting points d) electrons are transferred
How do you determine the relative polarity of a molecule?
a) The farther the elements are from fluorine, the more polar they are b) Non-polar molecules are ionic c) Subtract the atomic masses d) Add the number of protons
The symbol after a formula indicates
a) the coefficient b) the ratio of atoms c) the number of moles d) the state of matter
Which bond is the LEAST polar?
a) P--O b) Na--Cl c) Li --Cl d) Ca--F
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