2° Science Exam B3P2

What is at the center of an atom?

• • Electrons

• • Protons and neutrons

• • Molecules

• Noble gases

Which of the following elements are considered noble gases?

• • Hydrogen, Helium, Neon

• • Helium, Neon, Argon

• • Argon, Krypton, Sodium

• Radon, Xenon, Carbon

Atoms join together to form molecules by:

• • Sharing or exchanging neutrons

• • Sharing or exchanging protons

• • Sharing or exchanging electrons

• Sharing or exchanging nuclei

What are molecules made of?

• • Atoms of a single element

• • Atoms of one or more elements

• • Isolated atoms

• Only noble gases

How are atoms arranged in crystals?

• • In random patterns

• • In a liquid state

• • In structured ways

• In gaseous form

Which type of crystalline substances is formed by atoms of the same element?

• • Crystalline compounds

• • Simple crystalline substances

• • Noble gases

• Isolated atoms

Crystalline compounds are:

• • Formed by atoms of a single element

• • Found only in gaseous form

• • Solid substances formed by atoms of two or more elements

• Formed by sharing neutrons

What are chemical reactions that change flavors and odors in food called?

• • Fermentation reactions

• • Photosynthesis reactions

• • Browning reactions

• Catalytic reactions

What happens during the Maillard reaction?

• • Sugars and carbohydrates are heated to 150°C

• • Proteins and sugars are broken down through heating

• • Enzymes react with phenols and oxygen

• Metal oxidizes when exposed to air and water

Which of the following describes caramelization?

• • Proteins and sugars are broken down through heating food

• • Enzymes in fruits and vegetables react to phenols and oxygen

• • Certain sugars and carbohydrates are heated to 150°C

• Wood burns quickly when exposed to heat