Unit B Chem: Substances v Mixtures

What are the two main categories of matter?

• Elements and Compounds

• Solids and Liquids

• Pure Substances and Mixtures

• Atoms and Molecules

Which of the following is an example of a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

What does the Law of Conservation of Mass state?

• Mass can be created and destroyed

• Mass is constant in a closed system

• Mass is always increasing

• Mass is always decreasing

What is the term for the amount of mass per unit volume?

• Density

• Weight

• Volume

• Pressure

Which of the following is a method used for mole conversions?

• Dimensional Analysis

• Fractional Distillation

• Chromatography

• Filtration

What is a pure substance made of only one type of atom that cannot be broken down into simpler substances?

• Compound

• Mixture

• Element

• Solution

Which of the following is an example of a compound?

• Oxygen (O₂)

• Gold (Au)

• Salt (NaCl)

• Iron (Fe)

What is a mixture of two or more pure substances with uniform composition called?

• Heterogeneous mixture

• Homogeneous mixture

• Compound

• Element

What term describes a solution that is dissolved in water?

• Homogeneous

• Aqueous

• Heterogeneous

• Compound

Which of the following is a mixture of two or more pure substances with different phases?

• Homogeneous mixture

• Solution

• Heterogeneous mixture

• Element