Understanding Salt and Crystals

What is the primary chemical composition of table salt?

• Potassium chloride

• Calcium carbonate

• Sodium chloride

• Sodium bicarbonate

What is a crystal lattice?

• A random arrangement of atoms

• A liquid structure

• A regular repeating arrangement of atoms

• A single atom structure

Which of the following is a characteristic of cubic crystals?

• They have unequal sides

• They are always hexagonal

• They have equal sides and symmetry

• They are always tetrahedral

What type of crystal structure does quartz have?

• Cubic

• Oblong

• Hexagonal

• Tetrahedral

Why does salt lower the freezing point of ice?

• It increases the temperature

• It absorbs heat from the surroundings

• It dissolves into the ice, disrupting the freezing process

• It changes the molecular structure of water

What type of bond holds sodium and chloride ions together in salt?

• Ionic bond

• Hydrogen bond

• Metallic bond

• Covalent bond

What is the melting point of ice in degrees Celsius?

• 15 degrees

• 32 degrees

• 0 degrees

• 100 degrees

What is the main difference between ionic and molecular solids?

• Ionic solids are liquid at room temperature, molecular solids are solid

• Ionic solids are soft, molecular solids are hard

• Ionic solids have low melting points, molecular solids have high melting points

• Ionic solids are hard and brittle, molecular solids are soft

What is the origin of the word 'crystal'?

• German for 'hard'

• Latin for 'clear'

• Greek for 'icy cold'

• French for 'shiny'

What advanced topic in crystallography is mentioned in the video?

• X-ray crystallography

• Quantum crystallography

• Thermal crystallography

• Magnetic crystallography