Crime Busters Georgia Science Olympiad

What is the primary purpose of chromatography in the Crime Busters event?

• To separate mixtures into individual components

• To measure the pH of a solution

• To determine the boiling point of a liquid

• To identify the density of a solid

Which of the following substances is commonly used as a solvent in chromatography?

• Water

• Ethanol

• Acetone

• All of the above

In the context of Crime Busters, what is the role of a reagent?

• To act as a catalyst

• To react with a specific substance to produce a visible change

• To increase the temperature of a reaction

• To decrease the pressure of a system

What is the significance of the Rf value in chromatography?

• It indicates the purity of a substance

• It helps identify substances based on their movement on the chromatography paper

• It measures the acidity of a solution

• It determines the solubility of a compound

Which of the following is a common method for collecting evidence in a Crime Busters investigation?

• Fingerprint analysis

• DNA sequencing

• Gas chromatography

• All of the above

What is the main difference between a physical and a chemical change?

• A physical change alters the chemical composition

• A chemical change is reversible

• A physical change is reversible

• A chemical change does not alter the chemical composition

Which of the following is an example of a chemical change?

• Melting ice

• Burning wood

• Breaking glass

• Dissolving sugar in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a Crime Busters experiment, what is the purpose of using a control sample?

• To provide a standard for comparison

• To increase the reaction rate

• To decrease the reaction rate

• To ensure the experiment is safe

What is the role of a catalyst in a chemical reaction?

• To slow down the reaction

• To increase the activation energy

• To speed up the reaction

• To change the products of the reaction

Tags

NGSS.HS-PS1-5

Which of the following is a characteristic of a base?

• Sour taste

• Turns red litmus paper blue

• Reacts with metals to produce hydrogen gas

• Has a pH less than 7