Atomic Structure and Chemical Reactions

This video tutorial is part of the GED science course, focusing on atomic theory, periodic table trends, chemical bonding, and thermodynamics. It covers key concepts such as the relationship between atomic number and protons, electronegativity trends, properties of elements in the same group, subatomic particles, balancing chemical equations, and identifying exothermic and endothermic reactions through temperature changes.

What is the atomic number of an element equal to?

• The number of electrons in the atom

• The number of protons in the atom

• The number of neutrons in the atom

• The sum of protons and neutrons in the atom

How does electronegativity change from carbon to fluorine?

• It decreases

• It increases

• It remains constant

• There is no clear trend

What is true about elements in the same group on the periodic table?

• They have similar electronegativities

• They have the same number of electrons

• They have similar atomic masses

• They have similar chemical properties

Which subatomic particles are found in the nucleus of an atom?

• Electrons only

• Protons and neutrons

• Neutrons and electrons

• Protons and electrons

What is the charge of a neutron?

• Neutral

• Negative

• Positive

• Variable

What is the balanced chemical equation for the reaction between hydrogen gas and oxygen gas to form water?

• 2 H2 + O2 → H2O

• H2O → 2 H2 + O2

• 2 H2 + O2 → 2 H2O

• 2 H2O → H2 + O2

What is the coefficient for oxygen gas in the balanced equation for the combustion of propane?

• 5

• 4

• 3

• 2

How can you determine if a reaction is exothermic or endothermic?

• By measuring the volume of reactants and products

• By measuring the weight of reactants and products

• By measuring the temperature change

• By measuring the color change

What happens to the temperature in an exothermic reaction?

• It increases

• It decreases

• It remains constant

• It fluctuates

What type of reaction absorbs heat from its surroundings?

• Exothermic

• Adiabatic

• Endothermic

• Isothermal