U1T2.1 Review

Chemical reactions are useful because they:

• provide energy for various processes

• are not involved in any biological processes

• do not affect the environment

• are only used in laboratories

During a chemical reaction, substances change by:

• changing their physical state only.

• forming new substances with different properties.

• remaining unchanged.

• only changing their temperature.

Energy is absorbed or released by chemical reactions through:

• the breaking and forming of chemical bonds

• the movement of electrons

• the change in temperature

• the presence of a catalyst

What is an example of a common chemical reaction mentioned in the text?

• Mixing vinegar with baking soda

• Mixing water with oil

• Mixing salt with sugar

• Mixing sand with water

During a chemical reaction, substances react to produce ______ with different properties from the original substance.

• new substances

• the same substances

• no substances

• identical substances

Some chemical reactions are simple, while others are ______.

• complex

• easy

• fast

• slow

What natural ripening gas do bananas release?

• Oxygen

• Ethylene

• Carbon Dioxide

• Nitrogen

What does ethylene trigger in bananas?

• Sugar production

• Enzyme production

• Water absorption

• Vitamin production

What does the amylase enzyme break down in bananas?

• Amylase enzyme breaks down starches (complex sugars) into simple sugars.

• Amylase enzyme breaks down proteins into amino acids.

• Amylase enzyme breaks down fats into fatty acids.

• Amylase enzyme breaks down fibers into cellulose.

What do other enzymes trigger in bananas?

• Other enzymes trigger colour change and softening of fruit.

• Other enzymes trigger the production of seeds.

• Other enzymes trigger the growth of new leaves.

• Other enzymes trigger the increase in sugar content.