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Atoms, Molecules And Reactions

Test Description: Prepare for Fall Final Exam

Instructions: Answer all questions to get your test result.

1) When measuring a substance the _____________ digit is an estimated digit.

Adigit after the decimal Bfirst Clast Ddigit before the decimal

2) The particles in a snow globe represent a

Acompound Bsolution Chomogenous mixture Dsuspension

3) The nucleus was discovered by ____ when he found that .

ARutherford...... alpha particles deflected back BRutherford ...... gamma particles have no mass CMendeleev....atomic number increases with atomic mass DMendeleev.... atomic mass increases with atomic number

4) Which scientist based periodic on atomic NUMBER?

AMosley BRutherford CMendeleev DMeyer

5) Electrons were discovered using which piece of equipment?

Ageiger counter Bnuclear reactor Ccloud chamber Dcathode ray tube

6) The third period of the period table contains

As, d and f blocks Bs block only Cp block only Ds and p blocks

7) Which is NOT true of ionic compounds

Athey are usually in a gaseous state Bthey have high melting points Cthey have a crystalline structure Delectrons are transferred

8) How do you determine the relative polarity of a molecule?

AAdd the number of protons BNon-polar molecules are ionic CSubtract the atomic masses DThe farther the elements are from fluorine, the more polar they are

9) The symbol after a formula indicates

Athe state of matter Bthe number of moles Cthe coefficient Dthe ratio of atoms

10) Which bond is the LEAST polar?

ANa--Cl BCa--F CLi --Cl DP--O

*select an answer for all questions

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