Bake it - Separating Materials

What gas does yeast produce when bread rises?

• Nitrogen

• Oxygen

• Carbon dioxide

• Hydrogen

Which condition helps yeast grow best?

• Cold, dry place

• Hot oven

• Warm, moist environment

• Freezer

Why do bakers say yeast is “alive”?

• It makes bread tasty

• It breathes, feeds, and reproduces

• It moves fast

• It’s a chemical

What does yeast need to stay alive?

• Salt & cold air

• Sugar, warmth & moisture

• Light & soil

• Only air

What type of living organism is yeast?

• Plant

• Fungus

• Bacteria

• Virus

Why does bread dough rise when yeast is added?

• Air is trapped by water

• Yeast produces carbon dioxide

• Heat expands the dough

• Yeast adds flavor

Which forms a solution?

• Oil + water

• Salt + water

• Pepper + water

• Sand + water

Which of these will dissolve in water?

• Oil

• Sugar

• Pepper

• Sand

What does the term soluble mean?

• Can dissolve in a liquid

• Cannot dissolve

• Changes color

• Freezes quickly

What does insoluble mean?

• Can dissolve

• Cannot dissolve

• Changes state

• Floats easily