Rates of Reaction Teacher Demo Quiz

The variable that is changed or manipulated by the researcher in an experiment.

The variable that is measured or observed in an experiment and is affected by the independent variable.

An experiment where only one variable is changed (independent variable) at a time, while all other variables are kept constant.

Results that are consistent and accurate when the experiment is repeated.

How quickly a chemical reaction occurs.

Eating the right amount from each food group for good health.

Provides energy for daily activities.

Repair and build body tissues.

Essential for healthy bodily functions.

Helps food move through the digestive system.

Reactants must collide to react. Collisions need enough energy.

The exposed area of a solid. More surface area = faster reaction.

Speeds up reactions, but isn't used up.

Higher temp usually speeds up reactions.

Enzymes breaking down large food molecules into smaller, absorbable ones.

Proteins breaking down large molecules into smaller ones.

Breaks down starch into sugar.

Breaks down proteins into amino acids.

Breaks down fats into fatty acids and glycerol.

Unbalanced diet leading to undernutrition, vitamin/mineral deficiency, or overweight.

Rickets, causing weak bones and bowed legs.

Weight (kg) divided by height (m) squared.

Identifying potential weight problems.

Anemia, causing fatigue and weakness.

The total length covered during a journey.

The rate at which something moves.

The duration of an event or activity

A type of nutrient that provides energy for your body's activities.

A type of nutrient that helps build and repair tissues in your body.

The Benedict's test is used to detect the presence of sugar in a solution. The color change indicates the concentration of sugar: No color change - no sugar, green - moderate sugar, red - large amount of sugar.

The iodine test is used to test for the presence of starch in a substance. Starch produces a blue-black color reaction when iodine is added.

The liver is responsible for producing bile, which helps in breaking down fats, and neutralizes acids in the body.

Peristalsis is the involuntary muscle contractions that move food through the esophagus towards the stomach.

The pancreas produces enzymes, including amylase (breaks down carbohydrates), protease (breaks down proteins), and lipase (breaks down fats).

The formula to calculate average speed: Average speed = (total distance) / (total time)

Standard units for measuring speed include meters per second (ms-1), kilometers per hour (kmh-1), and miles per hour (mh-1).

A horizontal line on a distance-time graph indicates that an object is stationary or not moving.

A slanted line on a distance-time graph represents an object moving at a constant speed.

The total distance a vehicle travels before coming to a complete stop. It includes both the thinking distance (distance traveled while reacting) and the braking distance (distance traveled while applying brakes).

Increasing temperature makes particles move faster and collide more often with greater energy, leading to a quicker reaction.

A higher concentration of reactants means more particles are available to collide, increasing the frequency of successful collisions and speeding up the reaction.

Catalysts speed up chemical reactions without being used up themselves by lowering the activation energy needed for reactions to occur.

The minimum energy required for reactants to collide and react.

Catalysts lower the activation energy needed for a reaction, making it easier for reactants to collide and react.

Hazard symbols are used to warn about potential dangers from chemicals or materials. They are visual indicators that provide quick and easy information on the risks associated with a substance.

They are important because they offer a universal language that everyone can understand, regardless of their language or literacy level. This ensures that even those who cannot read text can still be aware of potential dangers.

This hazard symbol indicates that a substance is harmful or irritating. It may cause skin irritation, eye irritation, or respiratory problems.

This symbol means that the substance is very sensitive to shock or heat, and could explode under certain conditions. It's crucial to be extremely careful when handling such substances.

This symbol indicates that the substance can damage living tissue, surfaces, or materials upon contact. It can cause burns and other severe damage.