Quiz: Chemistry Regents Exam Practice Test

22 Questions | By E6sthomas | Updated: Jul 24, 2022 | Attempts: 12135

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Quiz: Chemistry Regents Exam Practice Test - Quiz

Prepare yourself to take this "Chemistry Regents Exam Practice Test" and check how well you score on this quiz. In chemistry, a reagent or analytical reagent is meant by a substance or compound which is added to a system to cause a chemical reaction or test if one occurs. The terms reactant and reagent are usually used interchangeably, but reactant tells a substance consumed during a chemical reaction. Let us test you now!

Questions and Answers

1.

Compared to the charge and mass of a proton, an electron has...
- A.
  
  The same charge and a smaller mass.
- B.
  
  The same charge and the same mass.
- C.
  
  An opposite charge and a smaller mass.
- D.
  
  An opposite charge and the same mass.
2.

When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of _____.
- A.
  
  Deuterons
- B.
  
  Neutrons
- C.
  
  Protons
- D.
  
  Unoccupied space
3.

A proton has approximately the same mass as...
- A.
  
  A neutron.
- B.
  
  An alpha particle.
- C.
  
  A beta particle.
- D.
  
  An electron.
4.

What is an example of "Yttrium" in the excited state?
- A.
  
  2-7-19-9-2
- B.
  
  2-8-18-9-2
- C.
  
  2-7-17-8-3
- D.
  
  2-8-18-7-4
- E.
  
  2-8-18-6-6
5.

Which symbols represent atoms that are isotopes?
- A.
  
  C-14 and N-14
- B.
  
  O-16 and O-18
- C.
  
  Rn-222 and Ra-222
- D.
  
  I-131 and I-131
6.

Which atom contains exactly 15 protons?
- A.
  
  P-32
- B.
  
  S-32
- C.
  
  O-15
- D.
  
  N-15
7.

An ion with 5 protons, 6 neutrons, and a charge of 3+ has an atomic number of...
- A.
  
  5
- B.
  
  6
- C.
  
  8
- D.
  
  11
8.

What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?
- A.
  
  6
- B.
  
  28
- C.
  
  34
- D.
  
  62
- E.
  
  90
9.

Which three groups of the Periodic Table contain the most elements classified as metalloids (semimetals)?
- A.
  
  1, 2, and 13
- B.
  
  2, 13, and 14
- C.
  
  14, 15, and 16
- D.
  
  16, 17, and 18
10.

Which element has the highest first ionization energy?
- A.
  
  Sodium
- B.
  
  Aluminum
- C.
  
  Calcium
- D.
  
  Phosphorus
11.

When a metal atom combines with a nonmetal atom, the nonmetal atom will...
- A.
  
  Lose electrons and decrease in size.
- B.
  
  Lose electrons and increase in size.
- C.
  
  Gain electrons and decrease in size.
- D.
  
  Gain electrons and increase in size.
12.

Which element in Group 15 has the strongest metallic character?
- A.
  
  Bi
- B.
  
  As
- C.
  
  P
- D.
  
  N
13.

Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms'...
- A.
  
  Number of principal energy levels.
- B.
  
  Number of valence electrons.
- C.
  
  Atomic numbers.
- D.
  
  Atomic masses.
14.

At STP, which substance is the best conductor of electricity?
- A.
  
  Nitrogen
- B.
  
  Neon
- C.
  
  Sulfur
- D.
  
  Silver
15.

Given the unbalanced equation: Al + O₂ = Al₂O₃ When this equation is completely balanced using the smallest whole numbers, what is the sum of the coefficients?
- A.
  
  2
- B.
  
  3
- C.
  
  4
- D.
  
  7
- E.
  
  9
16.

What is the empirical formula of the compound whose molecular formula is P₄O₁₀? (NOTE: Pv2O = P₂O)
- A.
  
  PO
- B.
  
  POv2
- C.
  
  Pv2Ov5
- D.
  
  Pv8Ov20
17.

Which is the correct formula for nitrogen (1) oxide? (NOTE: Nv2O = N₂O)
- A.
  
  NO
- B.
  
  Nv2O
- C.
  
  NOv2
- D.
  
  Nv2Ov3
18.

What is the total number of atoms represented in the formula CuSO₄ ^. 5H₂O?
- A.
  
  8
- B.
  
  21
- C.
  
  13
- D.
  
  27
19.

What is the gram formula mass of K₂CO₃?
- A.
  
  106 g
- B.
  
  67 g
- C.
  
  99 g
- D.
  
  138 g
20.

What is the percent by mass of oxygen in magnesium oxide, MgO?
- A.
  
  20%
- B.
  
  30%
- C.
  
  40%
- D.
  
  50%
- E.
  
  60%
21.

What is the total number of moles of hydrogen gas contained in 9.03 x 10²³?
- A.
  
  1.50 moles
- B.
  
  2.00 moles
- C.
  
  6.02 moles
- D.
  
  9.03 moles
22.

Which formula represents a molecular substance?
- A.
  
  CaO
- B.
  
  CO
- C.
  
  Al2O3
- D.
  
  Li2O