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What is the main source of energy for our body?
The food we eat.
Which two substances are needed for aerobic respiration?
Glucose and oxygen.
What is the resulting image on chromatography paper called?
A chromatogram.
What is the solvent front?
The point that the solvent reaches on chromatography paper.
What is the moment of a force?
The turning effect of a force.
What type of sugar is produced when carbohydrates are broken down?
Glucose
What are the two products of aerobic respiration?
Carbon dioxide and water.
What is the role of the solvent in paper chromatography?
It dissolves and carries substances up the paper.
What does it mean if a food dye is a pure substance?
It contains only one substance.
Which two factors affect the moment of a force?
The size of the force and its distance from the pivot.
How is glucose transported to cells throughout the body?
Through the blood
Write the word equation for aerobic respiration.
Glucose + oxygen → carbon dioxide + water.
Why do different coloured inks travel different distances?
Because they have different solubilities.
Why do scientists use chromatography to test food dyes?
To identify substances that may be toxic or cause allergic reactions.
Write the formula for calculating a moment.
Moment = Force × Distance.
Which cell structures release energy from glucose?
Mitochondria
Why do respiring cells become slightly warmer than their surroundings?
Some energy is changed into heat energy.
Which ink travels further: more soluble or less soluble ink?
More soluble ink.
What is a lever?
An object that turns under the action of a force.
What is the unit of moment?
Newton metre (Nm)
What is aerobic respiration?
A chemical reaction that uses oxygen to release energy from glucose.
What is paper chromatography used for?
To separate different substances in a mixture.
Which solvent can be used to separate permanent marker ink?
Alcohol
What is a pivot?
The point around which a lever turns.
When is a seesaw balanced?
When the clockwise and anticlockwise moments are equal.