Mastering Regents Chemistry Concepts for 2022

This video tutorial covers a comprehensive review of chemistry topics for the Regents exam. It includes discussions on isotopes, electron configurations, ions, nuclear decay, distillation, periodic trends, allotropes, bonding, balancing equations, mole conversions, equilibrium, pH, electrochemical cells, and isomers. The video provides detailed explanations and examples to help students understand these concepts and prepare for their exams.

What defines isotopes of the same element?

• Same number of neutrons, different protons

• Same number of protons, different neutrons

• Different number of protons and neutrons

• Same number of neutrons, different electrons

What happens when an electron moves from an excited state back to the ground state?

• Energy is absorbed

• Energy is released as light

• The atom becomes ionized

• The atom becomes neutral

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Which type of nuclear decay involves the emission of a helium nucleus?

• Beta decay

• Gamma decay

• Alpha decay

• Positron emission

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Which element is known as the 'biggest loser' in terms of losing electrons?

• Fluorine

• Francium

• Helium

• Hydrogen

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What type of bond involves the sharing of electrons?

• Hydrogen bond

• Metallic bond

• Covalent bond

• Ionic bond

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NGSS.HS-PS1-1

How many moles are in 24 grams of carbon (atomic mass = 12 g/mol)?

• 2 moles

• 1 mole

• 4 moles

• 3 moles

What is the percent of water in a hydrate if the mass of the hydrate is 6 grams and the anhydrous mass is 5.5 grams?

• 16.67%

• 8.33%

• 10%

• 12.5%

According to Le Chatelier's principle, what happens when the pressure is increased in a system with fewer gas molecules on the right side?

• The system releases heat

• The system remains unchanged

• The system shifts to the right

• The system shifts to the left

In a voltaic cell, which electrode is the site of oxidation?

• Cathode

• Electrolyte

• Anode

• Salt bridge

What is an isomer?

• A compound with identical molecular and structural formulas

• A compound with the same molecular formula but different structural formula

• A compound with the same structural formula but different molecular formula

• A compound with different molecular and structural formulas