AQA Trilogy chemistry paper 2

Front

Which gas makes up 78% of our atmosphere?

Back

Nitrogen is the gas that makes up 78% of our atmosphere.

Front

What value is equal to [dot distance / solvent front distance]?

Back

Rf (Retention factor) is equal to the ratio of the distance traveled by the substance to the distance traveled by the solvent front.

Front

What does a LCA assess?

Back

A Life Cycle Assessment (LCA) assesses the environmental impact of a product throughout its life cycle.

Front

Which of these is NOT a greenhouse gas?

Back

Hydrogen is NOT a greenhouse gas.

Front

Fractional distillation separates the hydrocarbons in crude oil because they ..?

Back

Fractional distillation separates hydrocarbons because they have different boiling points.

Front

What is the definition of a greenhouse gas?

Back

A greenhouse gas is a gas that traps heat in the atmosphere, contributing to the greenhouse effect.

Front

What is the purpose of fractional distillation in the petroleum industry?

Back

The purpose of fractional distillation is to separate crude oil into its component hydrocarbons based on their boiling points.

Front

What is the carbon footprint?

Back

The carbon footprint is the total amount of greenhouse gases emitted directly or indirectly by an individual, organization, event, or product.

Front

What is the significance of Rf values in chromatography?

Back

Rf values help identify substances based on their movement in a solvent during chromatography.

Front

What is the main component of air that supports combustion?

Back

Oxygen is the main component of air that supports combustion.