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General Chemistry Basics: Sections 1.1-1.8

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Termini in questo insieme (20)

  • What is the scientific method?

    The scientific method is a systematic approach to research involving observation, hypothesis formation, experimentation, and conclusion.

  • Define hypothesis in scientific research.

    A hypothesis is a testable and falsifiable statement or prediction based on observations.

  • What distinguishes a theory from a hypothesis?

    A theory is a well-substantiated explanation supported by extensive evidence, while a hypothesis is a preliminary testable idea.

  • What is the difference between an element and a compound?

    An element consists of one type of atom; a compound contains two or more elements chemically combined.

  • Define mixture and its two main types.

    A mixture is a physical combination of substances; types include homogeneous (uniform) and heterogeneous (non-uniform) mixtures.

  • What is an atom?

    An atom is the smallest unit of an element that retains its chemical properties.

  • Describe the structure of an atom.

    An atom has a nucleus containing protons and neutrons, surrounded by electrons in orbitals.

  • What is an isotope?

    Isotopes are atoms of the same element with different numbers of neutrons.

  • Define atomic number and mass number.

    Atomic number is the number of protons; mass number is the sum of protons and neutrons in the nucleus.

  • What is the mole concept?

    The mole is a unit representing \(6.022\times10^{23}\) particles of a substance.

  • Explain the difference between physical and chemical properties.

    Physical properties can be observed without changing composition; chemical properties describe how a substance reacts to form new substances.

  • What is the law of conservation of mass?

    The law of conservation of mass states mass is neither created nor destroyed in a chemical reaction.

  • Define intensive and extensive properties.

    Intensive properties do not depend on amount (e.g., density); extensive properties depend on amount (e.g., mass).

  • What is the difference between accuracy and precision?

    Accuracy is closeness to the true value; precision is reproducibility of measurements.

  • Describe the difference between qualitative and quantitative data.

    Qualitative data describes qualities; quantitative data involves numerical measurements.

  • What is a chemical change?

    A chemical change results in the formation of new substances with different properties.

  • Define the term 'pure substance'.

    A pure substance has a fixed composition and distinct properties, either an element or a compound.

  • What is the difference between a compound and a mixture in terms of separation?

    Compounds require chemical methods to separate; mixtures can be separated by physical means.

  • Explain the significance of the periodic table in chemistry.

    The periodic table organizes elements by increasing atomic number and similar chemical properties.

  • What is the role of electrons in chemical bonding?

    Electrons, especially valence electrons, determine how atoms bond chemically.