June 2011 Chemistry Regents #1-10

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-54 Questions 55-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-70 Questions 71-73 Questions 74-76 Questions 77-79 Questions 80-82 Questions 83-85

 

Questions

Answer Link Explanations
1  A neutron has a charge of

(1) +1  (2) +2  (3) 0  (4) -1

3 Link neutrons have no charge
2 Which particle has the least mass?

(1) alpha             (3) neutron

(2) beta particle   (4) proton

2 Link masses

alpha=4  beta~0 neutron=1 proton =1 

(Table O top numbers)

3 A sample of matter must be copper if

(1) each atom in the sample has 29 protons

(2) atoms in the sample react with oxygen

(3) the sample melts at 1768 K

(4) the sample can conduct electricity

1 Link same element same number of protons

Cu has 29 protons

4 In the electron cloud model of the atom, an orbital is defined as the most probable

(1) charge of an electron

(2) conductivity of an electron

(3) location of an electron

(4) mass of an electron

3 Link electron cloud is the most probable location of an electron
5 The elements of the Periodic Table are arranged on order of increasing

(1) atomic number

(2) mass number

(3) number of isotopes

(4) number of moles

1 Link the periodic table is arranged by atomic number

(maybe you should look at a periodic table and not take my word for it)

6 Which element has the highest melting point?

(1) tantalum       (3) osmium

(2) rhenium        (4) hafnium

2   Look at Table S under melting points (how clever)
7 In chemical reactions, there is a conservation of

(1) energy, volume and mass

(2) energy, volume and charge

(3) energy, charge and mass

(4) energy, charge and volume

3 Link Mass, charge and energy are must always be conserved

(chemist are natures accountants)

volume depends on temperature, pressure and number of moles

8 At STP, both diamond and graphite are solids composed of carbon atoms. These solids have

(1) the same crystal structure and same properties

(2) the same crystal structure and different properties

(3) different  crystal structure and same properties

(4) different  crystal structure and different properties

4 Link Since diamond and graphite are allotropes of carbon

they are different so there properties and structures must be different

9 The gram formula mass of a compound is 48 grams. The mass of 1.0 moles of this compound is

(1) 1.0g  (2) 4.8g  (3) 48.0g  (4) 480g

3 Link gram formula mass is the molar mass

this mass is the mass of 1.0 moles of this substance

ALSO See #35 on this test

10 Given the balanced equation representing a reaction:

Cl2==> Cl  + Cl

(1) A bond is broken and energy is absorbed

(2) A bond is broken and energy is released

(3) A bond is formed and energy is absorbed

(4) A bond is formed and energy is released

1 Link Breaking bonds require energy so it is absorbed

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-54 Questions 55-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-70 Questions 71-73 Questions 74-76 Questions 77-79 Questions 80-82 Questions 83-85

 
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