Science Quiz on Matter and Reactions

Aubrie and Elijah are conducting an experiment in their chemistry class. They need to identify which of the following is a pure substance. Can you help them?

• Air

• Gold

• Sand

• Lemonade

Which of the following is a homogeneous mixture?

• Fruit salad

• Oil and water

• Sugar dissolved in tea

• Granola bar

Gwyneth and Maggie are making a salad with lettuce, tomatoes, cucumbers, and carrots. Which of the following describes this type of mixture?

• A substance that is the same throughout

• Heterogeneous: A mixture where the different parts can be easily seen

• A chemical bond between elements

• Homogeneous: A solution that is evenly mixed

Josan and Chloe are conducting an experiment in their chemistry class. They mix vinegar and baking soda together. What are the starting substances in this chemical reaction?

• Products

• Solutions

• Reactants

• Mixtures

Scotti and Sam are comparing different materials in their science class. Which of the following is an example of a physical property they might observe?

• Flammability

• Reactivity with acid

• Melting point

• Ability to rust

During a science experiment, Steve and Armani mixed vinegar and baking soda. What happens to the matter during this chemical reaction?

• It disappears.

• It is created.

• It is rearranged to form new substances.

• It loses all mass.

During a science experiment, Karma and Elijah observe a reaction. Which of these is a sign of a chemical reaction?

• A substance changes shape.

• Ice melts into water.

• A new gas or solid forms.

• Salt dissolves in water.

Hunter is building a model of a water molecule for his science project. What is a molecule?

• The smallest unit of an element

• A group of two or more atoms bonded together

• A mixture of different elements

• A pure substance that cannot be broken down

During a science fair, Amiah and Fiona were discussing different types of materials. Kaylee asked, "Can you tell me which of the following is an example of a synthetic material?"

• Petroleum

• Natural gas

• Nylon

• Sodium chloride

Charlie and Ryan are working on a project in their science class to discover which property determines how well a substance allows electricity to flow. What property are they investigating?

• Pressure

• Conductivity

• Density

• Solubility