Atomic theory
Quiz by Emma Nordeman
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21 questions
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- Q1What does the atomic number of an element represent?The total number of electronsThe number of neutrons in the nucleusThe number of protons in the nucleusThe number of isotopes30s
- Q2Which subatomic particle has a negative charge?AtomProtonElectronNeutron30s
- Q3What does the nucleus of an atom contain?Only protonsElectrons and neutronsOnly electronsProtons and neutrons30s
- Q4What is the main idea of Dalton's atomic theory?Matter is made up of small particles called atomsAtoms can be created and destroyedAll atoms of an element are identicalAtoms are visible under a microscope30s
- Q5What particle is found in the nucleus and determines the element's identity?PhotonNeutronElectronProton30s
- Q6What is the region around the nucleus of an atom where electrons are likely to be found called?Proton zoneNeutron beltElectron cloudNuclear shell30s
- Q7Which of the following describes the mass number of an atom?The number of electrons onlyThe average mass of all isotopesThe total number of protons and neutronsThe number of protons only30s
- Q8Which of the following is an example of a compound?Salt (NaCl)Iron (Fe)Oxygen (O2)Water (H2O)30s
- Q9What is the main difference between a mixture and a compound?A mixture can be separated by physical means, while a compound cannot.Compounds have variable compositions; mixtures do not.A compound can change its state; a mixture cannot.Mixtures are always solid, while compounds are always liquid.30s
- Q10Which of the following is a characteristic of an element?It is made up of two or more different types of atoms.It can be separated into its components by filtration.It always forms a gas at room temperature.It cannot be broken down into simpler substances by chemical means.30s
- Q11Which of the following is an example of a homogeneous mixture?SaladSandRocky road ice creamSaltwater30s
- Q12What is the simplest form of matter that retains its identity?MoleculeAtomMixtureCompound30s
- Q13What type of mixture has a composition that is not uniform throughout?SolutionHomogeneous mixtureColloidHeterogeneous mixture30s
- Q14Which of the following represents a pure substance?Gold (Au)AirOcean waterSteel30s
- Q15What happens to the pressure of a gas if the volume decreases while keeping the temperature constant?The pressure decreasesThe pressure increasesThe pressure stays the sameThe volume increases30s