1) What is an element? a) A substance made of two or more types of atoms b) A pure substance made entirely of one type of atom c) A combination of compounds d) A mixture of solids, liquids, and gases 2) What does the atomic number of an element represent? a) The number of neutrons in the atom's nucleus b) The average mass of an atom c) The number of protons in the atom's nucleus d) The total number of protons and electrons 3) Which of the following is an example of a compound? a) Oxygen (O₂) b) Hydrogen (H) c) Water (H₂O) d) Iron (Fe) 4) What type of bond is formed when one atom donates an electron to another? a) Covalent bond b) Ionic bond c) Metallic bond d) Hydrogen bond 5) Which of the following is a characteristic of a heterogeneous mixture? a) Uniform composition throughout b) It contains only one phase c) Always exists in a solid form d) Ingredients can be visually distinguished 6) Which of the following is an example of a homogeneous mixture? a) Air b) Salad c) Pizza d) Concrete 7) What is the chemical formula of sodium chloride (table salt)? a) H₂O b) CO₂ c) NaCl d) CaCO₃ 8) Which of the following methods is used to separate solid particles from a liquid in a heterogeneous mixture? a) Distillation b) Chromatography c) Evaporation d) Filtration 9) What type of bond involves atoms sharing electrons? a) Covalent bond b) Ionic bond c) Metallic bond d) Hydrogen bond 10) Which of the following describes a homogeneous mixture? a) A mixture where the substances remain separate b) A mixture where components are evenly distributed c) A mixture that exists only in solid form d) A mixture that separates over time

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