Atoms and Molecules
Quiz by Pintu
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20 questions
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- Q1What is the smallest unit of an element that retains the properties of that element?MoleculeIonAtomCompound30s
- Q2Which of the following describes a molecule?A single atom of an elementA mixture of different substancesAn ion with a chargeA group of two or more atoms bonded together30s
- Q3What is the chemical formula for water?O₂CO₂NaClH₂O30s
- Q4Which of the following statements about elements and compounds is true?Compounds contain only one type of atomElements are always made of moleculesCompounds are made up of two or more different elements chemically combinedElements can be broken down into simpler substances30s
- Q5What type of bond involves the sharing of electron pairs between atoms?Covalent bondHydrogen bondIonic bondMetallic bond30s
- Q6Which particle has a positive charge and is found in the nucleus of an atom?ProtonNeutronPhotonElectron30s
- Q7What is the term for a substance made up of two or more different elements that are chemically bonded?CompoundMixtureSolutionElement30s
- Q8What is the charge of an electron?NeutralNegativeVariablePositive30s
- Q9What is the molar mass of carbon dioxide (CO₂)?18 g/mol32 g/mol28 g/mol44 g/mol30s
- Q10Which of the following elements is a noble gas?NeonHydrogenOxygenNitrogen30s
- Q11What is the process called when a solid changes directly into a gas?CondensationEvaporationDepositionSublimation30s
- Q12Which of the following particles has the least mass?ElectronNeutronAlpha particleProton30s
- Q13Which of the following statements about isotopes is true?Isotopes are always radioactiveIsotopes have different numbers of protonsIsotopes have the same number of protons but different numbers of neutronsIsotopes have the same atomic mass30s
- Q14What type of bond forms when electrons are shared between atoms?Metallic bondHydrogen bondCovalent bondIonic bond30s
- Q15What is the primary difference between a compound and a mixture?A mixture has a fixed ratio of elementsA compound has a fixed ratio of elementsA mixture contains only one type of atomA compound can be separated physically30s