Uni 1-1
Quiz by Zhao
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24 questions
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- Q1What is the defining characteristic of a chemical compound?It is a mixture of two or more elements in any proportion.It consists of two or more elements chemically combined in definite proportions.It is a group of atoms held together by physical forces.It can be separated into its constituent elements by physical means.30s
- Q2Which type of bond is formed when one or more electrons are transferred from one atom to another?Ionic bondCovalent bondVan der Waals forceHydrogen bond30s
- Q3A covalent bond is characterized by the...weak attraction between polar molecules.sharing of electrons between atoms.transfer of electrons between atoms.attraction between oppositely charged ions.30s
- Q4Which of the following is described as a weak attraction between a hydrogen atom and an atom like oxygen or nitrogen?Hydrogen bondCovalent bondIonic bondVan der Waals force30s
- Q5Substances that have the same molecular formula but different structural arrangements of atoms are called:IsotopesIsomersPolymersIons30s
- Q6Which subatomic particles are located in the nucleus of an atom?Protons and neutronsProtons and electronsNeutrons and electronsOnly electrons30s
- Q7Isotopes of the same element differ in their number of:ElectronsNeutronsCovalent bondsProtons30s
- Q8Which of the following is a key characteristic of radioactive isotopes (radioisotopes)?They form only covalent bonds with other atoms.They are exceptionally stable and do not change over time.They have more electrons than protons.They are unstable and release radiation as they break down.30s
- Q9What defines a chemical element?The number of neutrons in its atoms' nucleiThe total mass of its atomsThe number of protons in its atoms' nucleiThe number of electrons orbiting its atoms' nuclei30s
- Q10Which three subatomic particles constitute an atom?Neutrinos, neutrons, and electronsProtons, photons, and electronsProtons, neutrons, and electronsProtons, neutrons, and ions30s
- Q11Which of the following is a primary characteristic that classifies a diverse group of substances like fats, oils, and waxes as lipids?They are all hydrophobic, meaning they do not mix with water.They are all hydrophilic, meaning they dissolve well in water.They are all composed of glycerol and one fatty acid.They are all solid at room temperature.30s
- Q12The diagram illustrating the formation of a triglyceride shows one glycerol molecule reacting with three fatty acid molecules. What is this chemical process called?HydrolysisPhotosynthesisSaponificationDehydration Synthesis30s
- Q13What is the key chemical feature of a saturated fatty acid chain?It is always a very short chain of carbons.It contains multiple double bonds between carbon atoms.It has no double bonds between the carbon atoms.It has at least one triple bond between carbon atoms.30s
- Q14Which of these food items is a common source of saturated fats?AvocadosOlive oilNuts and seedsFatty cuts of beef30s
- Q15What does the Glycemic Index (GI) measure?The number of calories in a food.The amount of fat and protein in a food.The amount of 葡萄糖 (glucose) in a food.How quickly a food containing 碳⽔化合物 (carbohydrates) raises ⾎糖 (blood sugar) levels.30s