HESI A2
Chemistry HESI A2 Quizlet Questions
Question 1 of 5
What type of chemical reaction involves the reaction of a compound with oxygen?
Correct Answer: C
Rationale: The correct answer is C: Combustion. A combustion reaction is characterized by a compound reacting with oxygen. During this process, heat and light are often produced as energy is released in the form of heat. Combustion is a common type of reaction involving organic compounds, like hydrocarbons, reacting with oxygen to produce carbon dioxide and water.
Choices A, B, and D are incorrect because decomposition involves a compound breaking down into simpler substances, synthesis involves the combination of two or more substances to form a more complex one, and single replacement involves an element replacing another element in a compound.
Question 2 of 5
Which of the following types of matter changes in volume with changes in temperature and pressure?
Correct Answer: B
Rationale: A gas changes its volume with changes in temperature and pressure due to the particles moving more rapidly at higher temperatures, and pressure affects the space between particles. Liquids have a relatively fixed volume but take the shape of their container. Solids have a definite shape and volume, so they do not change volume with changes in temperature and pressure. Plasma is a state of matter where particles are highly energized and do not have a fixed volume, but it does not exhibit volume changes with temperature and pressure variations.
Question 3 of 5
If electrons are not shared equally in a covalent bond, the bond is what?
Correct Answer: A
Rationale: A polar covalent bond occurs when electrons are shared unequally between atoms. In this type of bond, one atom has a stronger pull on the shared electrons, leading to a partial positive and partial negative charge distribution within the molecule.
Choice B, non-polar, is incorrect because in non-polar covalent bonds, electrons are shared equally between atoms.
Choice C, ionic, is incorrect as ionic bonds involve a transfer of electrons rather than sharing.
Choice D, hydrogen, is incorrect as it does not describe the nature of a covalent bond.
Question 4 of 5
Beta radiation is the product of the decomposition of which particle?
Correct Answer: B
Rationale: Beta radiation is the result of the decomposition of a neutron. During beta decay, a neutron in an atom's nucleus is transformed into a proton, an electron (beta particle), and an antineutrino.
Therefore, the correct answer is 'Neutron.'
Choice A, 'Proton,' is incorrect because beta decay does not involve the decomposition of a proton.
Choice C, 'Electron,' is incorrect because electrons are actually produced during beta decay.
Choice D, 'Photon,' is incorrect as beta radiation does not involve the decomposition of photons.
Question 5 of 5
What are the three types of intermolecular forces?
Correct Answer: B
Rationale: The three types of intermolecular forces are hydrogen bonding, dipole interactions, and dispersion forces. Option A includes ionic and covalent bonds, which are intramolecular forces, not intermolecular. Option C includes van der Waals forces, which encompass dipole interactions and dispersion forces, but also includes ionic and covalent bonds. Option D is close but misses dipole interactions, which are distinct from hydrogen bonding and dispersion forces.
Therefore, option B is the correct choice as it includes the three specific types of intermolecular forces.