Skip to main content
Indietro

GOB Chemistry: Matter, Measurements, Atoms, and Periodic Table

I pulsanti di controllo sono stati cambiati in modalità "navigazione".
1/20

Termini in questo insieme (20)

  • What is matter?

    Matter is anything that has mass and occupies space.

  • What are the three common states of matter?

    Solid, liquid, and gas.

  • What is the basic unit of measurement for mass in chemistry?

    The gram (g) is the basic unit of mass.

  • What is the SI unit for length?

    The meter (m) is the SI unit for length.

  • Define an atom.

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

  • What are the three main subatomic particles in an atom?

    Protons, neutrons, and electrons.

  • Where are protons and neutrons located in an atom?

    In the nucleus at the center of the atom.

  • Where are electrons found in an atom?

    In the electron cloud surrounding the nucleus.

  • What does the atomic number represent?

    The number of protons in an atom's nucleus.

  • What is the mass number of an atom?

    The total number of protons and neutrons in the nucleus.

  • What is an isotope?

    Atoms of the same element with different numbers of neutrons.

  • What is the periodic table?

    A chart that organizes elements by increasing atomic number and similar chemical properties.

  • How are elements arranged in the periodic table?

    By increasing atomic number in rows called periods and columns called groups or families.

  • What do elements in the same group have in common?

    They have similar chemical properties and the same number of valence electrons.

  • What is a measurement in chemistry?

    A quantitative observation that includes a number and a unit.

  • Why are units important in measurements?

    Units provide the scale and context for the numerical value.

  • What is the difference between accuracy and precision?

    Accuracy is how close a measurement is to the true value; precision is how reproducible measurements are.

  • What is the role of significant figures in measurements?

    They indicate the certainty of a measurement and affect calculation results.

  • What is the law of conservation of matter?

    Matter cannot be created or destroyed in a chemical reaction, only transformed.

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

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