June 2024 Chemistry Regents Questions 1-10 Question Preview (ID: 63419)


The Questions In This Practice Exam Are Thoughtfully Crafted To Assess Your Knowledge And Skills. They Cover A Range Of Topics And Formats, Offering A Valuable Opportunity For Self-assessment And Preparation. TEACHERS: click here for quick copy question ID numbers.

Which description of the atom is based on the results of the gold foil experiment in the early 1900s?
a) Atoms are small, dense, indivisible spheres.
b) Atoms are composed of protons, electrons, and neutrons.
c) Atoms have small, dense, positively charged nuclei.
d) Atoms have electrons with wavelike properties.

According to the electron cloud model, which term is defined as the most probable location of an electron in an atom?
a) configuration
b) nucleus
c) orbital
d) spectrum

Which change occurs when an electron returns from a higher energy state to a lower energy state?
a) An ionic compound is formed, and energy is emitted.
b) An ionic compound is formed, and energy is absorbed.
c) A specific amount of energy is absorbed.
d) A specific amount of energy is emitted.

Which phrase describes the different isotopes of an element?
a) same number of electrons and a different number of protons
b) same number of protons and a different number of electrons
c) same number of protons and a different number of neutrons
d) same number of neutrons and a different number of protons

Which statement describes a chemical property of sodium?
a) It is silver in color.
b) It has a density of 0.97 g/cm3 at room temperature.
c) It has atoms with an atomic radius of 160 pm.
d) It is highly reactive with water.

Oxygen can exist as diatomic oxygen gas, O2(g), or ozone, O3(g). These two forms of oxygen have
a) the same molecular structure and the same properties
b) different molecular structures and different properties
c) the same molecular structure and different properties
d) different molecular structures and the same properties

Which formula contains a polyatomic ion?
a) KCN
b) K2S
c) AlBr3
d) Al2O3

What information about C4H10 can be determined from its structural formula, but not determined from its molecular formula?
a) physical state
b) molar mass
c) ratio of different atoms
d) arrangement of the atoms

Which quantity is conserved in all chemical reactions?
a) charge
b) density
c) moles
d) volume

What do the coefficients in a balanced chemical equation indicate about the substances in the equation?
a) mass ratios
b) mole ratios
c) empirical formulas
d) molecular formulas

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