pre requisites test

8/10/2019 Pre Requisites Test

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NAME and SURNAME: COUNTRY:

1) The periodic table of elements lists the atoms by progressive

a) Mass number (A)

b) Atomic number (Z)

2) Mark each of the following statements as true or false

a) rotons are heavier than electrons

b) rotons are attracted to neutrons

c) !lectrons are so small that they have no electrical charge

d) The nucleus contains all the protons and neutrons of an atom

") #or an atom of iron (atomic number $ 2%) that has a mass

number of &%' determine the following

a) The number of protons

b) The number of neutrons

c) The number of electrons

) *ould you use atomic number (Z)' mass number (A) or both to

obtain the following+

a) ,umber of protons in an atom

b) ,umber of neutrons in an atom

c) ,umber of particles in the nucleus

d) ,umber of electrons in a neutral atom

&) *rite the atomic symbols for isotopes with the following

a) 1& protons and 1% neutrons

b) "& protons and & neutrons

c) 1" electrons and 1 neutrons

%) -n what order do electrons .ll the energy levels 1/" for the .rst 10

elements on the periodic table+


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) *rite the electron level arrangement for the oygen atom (Z $

0)3

0) *rite the electronic con.guration of 4alcium (Z $ 25) and eplain

if the corresponding cation is 4a6or 4a263 *rite the formula of

calcium chloride/

7) *rite the electron/dot symbol for the bromine atom

15) The elements 8uorine and chlorine are in the same group on

the periodic table3 9ow many valence electrons are in each of

their outer energy levels+

11) :elect the larger atom in each pair

a) ,a or 4l

b) ,a or ;b

c) ,a or Mg

12) :elect the element in each pair with the higher ioni or =r

c) 4a or =a

1") *hich of the following pairs of elements are likely to form an

ionic compound+

a) ?ithium and chlorineb) @ygen and chlorine


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c) otassium and oygen

d) :odium and neon

1) 4omplete the following table for atoms and ions

Atom or Ion Number of

Protons

Number of

Electrons

Electrons

Lost/a!ned

>6

12p6 15e-

0p6 2e/gained

15e/

"e/

lost

1&) *hat is a mole+

1%) !plain how many molecules of oygen @2 are contained in "2

g of this gas (Atomic *eight @ $ 1%)

1) The atomic mass unit is de.ned as

a) the mass of the hydrogen atom containing only one proton3

b) the mass of electrons found in a carbon atom containing si

protons and neutrons3

c) 112 the mass of a carbon atom containing si protons and

si neutrons3

d) 11 the mass of a nitrogen atom containing protons and

neutrons3


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10) =alance the following eBuations

Al(@9)" 6 C92:@ D Al2(:@)" 6 92@

4l2@ 6 C92@ D 94l@

17) -n the reaction of iron and sulfur' how many moles of sulfur are

needed to react with %35 moles of iron+

2 #e(s) 6C" :(s) D #e2:"(s)

25) ropane 4"90 reacts with molecular oygen @2according to the

reaction

4"90 6 C@2 D 4@2 6 92@

=alance the reaction and calculate how many grams of 4@2are

produced by the complete combustion of g of propane and how

many grams of @2are reBuired (A* 9 1E 4 12E @1%)3

pre requisites test

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