2003 August Chemistry Regents Exam #1-10

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

 

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Questions Answer Explanation
1. Which electron transition represents a gain of energy?

A. from 2nd to 3rd shell
B. from 2nd to 1st shell
C. from 3rd to 2nd shell
D. from 3rd to 1st shell

 

A All the other transitions are decreasing
2. Which particles are found in the nucleus of an atom?

A. electrons, only
B. neutrons, only
C. protons and electrons
D. protons and neutrons

 

D electrons are found outside the nucleus
3. What is the total number of valence electrons in an atom of sulfur in the ground state?

A. 6
B. 8
C. 3
D. 4

 

A valence electrons are the outermost electrons

sulfur 2-8-6

4. An electron has a charge of

A. –1 and the same mass as a proton
B. +1 and the same mass as a proton
C. –1 and a smaller mass than a proton
D. +1 and a smaller mass than a proton

 

C electron are negative and have very little mass compared to a proton or neutron
5. The elements in the Periodic Table are arranged in order of increasing

A. atomic number
B. atomic radius
C. mass number
D. neutron number

 

A atomic numbers are the only consistant pattern

atomic mass has a few hiccups  

6. What is the correct IUPAC name for the compound NH4Cl?

A. nitrogen chloride
B. nitrogen chlorate
C. ammonium chloride
D. ammonium chlorate

C NH4+ ammonium  Cl-  chloride
7. Which element is a solid at STP?

A.  H2
B. I2
C. N2
D. O2

 

B hydrogen nitrogen and oxygen are all gases

Iodine solid at room STP

melting points are on table S

8. In which compound is the percent by mass of oxygen greatest?

A. BeO
B. MgO
C. CaO
D. SrO

 

A Be has the smallest mass therefore BeO has the greatest % mass of oxygen
9. Based on Reference Table F, which of these salts is the best electrolyte?

A. sodium nitrate
B. magnesium carbonate
C. silver chloride
D. barium sulfate

A nitrates are soluble all the others are insoluble
10. What is conserved during a chemical reaction?

A. mass, only
B. charge, only
C. both mass and charge
D. neither mass nor charge

 

C everything is conserved in a chemical reaction

mass, charge, energy

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

 
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