Q2E1: Atomic Structure and Electron Configuration

What is the significance of noble gas configurations in chemistry?

• They represent stable electron configurations that are often used to simplify the representation of electron arrangements.

• They are the only configurations that can exist in nature.

• They are used to predict the reactivity of all elements.

• They indicate the presence of unpaired electrons in an atom.

What is a pure substance?

• A material with a constant composition that is homogeneous throughout.

• A mixture of different substances that can be separated easily.

• A substance that can exist in multiple phases at the same time.

• A material that has varying composition and properties.

What is the difference between an element and a compound?

• An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

• An element can be broken down into simpler substances, while a compound cannot.

• A compound is a pure substance made of one type of atom, while an element is made of two or more different types of atoms.

• Elements are always gases, while compounds can be solids, liquids, or gases.

What is the importance of understanding electron configurations?

• They help predict an element's chemical properties and reactivity.

• They determine the physical state of an element at room temperature.

• They indicate the color of an element in its gaseous state.

• They provide information about the element's atomic mass.

What is the chemical formula for photosynthesis?

• 6CO₂ + 6H₂O + Heat → C₆H₁₂O₆ + 6O₂

• C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Heat

• 6O₂ + 6H₂O + Light → C₆H₁₂O₆ + 6CO₂

• 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ + Energy

What are the products of photosynthesis?

• Glucose (C₆H₁₂O₆) and oxygen (O₂).

• Carbon dioxide (CO₂) and water (H₂O).

• Glucose (C₆H₁₂O₆) and nitrogen (N₂).

• Oxygen (O₂) and sulfur (S).

What is the difference between exothermic and endothermic reactions?

• Exothermic reactions absorb heat, while endothermic reactions release heat.

• Exothermic reactions release heat, while endothermic reactions absorb heat.

• Both exothermic and endothermic reactions release heat.

• Exothermic reactions occur only in gases, while endothermic reactions occur in liquids.

What is the role of chlorophyll in photosynthesis?

• Chlorophyll absorbs light energy, which is used to convert carbon dioxide and water into glucose and oxygen.

• Chlorophyll releases oxygen as a waste product during photosynthesis.

• Chlorophyll helps in the absorption of nutrients from the soil.

• Chlorophyll is responsible for the color of the plant's flowers.

What is an endothermic reaction?

• A reaction that releases heat into its surroundings.

• A reaction that absorbs heat from its surroundings.

• A reaction that occurs spontaneously without energy input.

• A reaction that produces light as a byproduct.

What is the role of heat in endothermic reactions?

• Heat is released into the surroundings to drive the reaction forward.

• Heat is absorbed from the surroundings to drive the reaction forward.

• Heat has no effect on the reaction.

• Heat is used to cool down the reaction.