Question

multiple choice questions
answer the following multiple choice questions about the reading.

1. what is the main purpose of chromatography?

a. to create new elements in a laboratory setting
b. to measure the temperature of different liquids
c. to combine different substances into a single mixture
d. to separate mixtures into their individual components

1. which of the following is not a type of phase used in chromatography?

a. stationary phase
b. solid phase
c. mobile phase
d. liquid phase

1. according to the passage, what can scientists use chromatography for?

a. to predict the weather patterns
b. to create new types of medicine
c. to determine the age of rocks
d. to find out whats in our water, food, and bodies
simple reasoning

1. according to the passage, how does the speed at which different parts of a mixture move during chromatography relate to their interaction with the stationary phase?

a. all parts of the mixture move at the same speed regardless of the stationary phase.
b. parts that stick more to the stationary phase move more quickly.
c. the speed of movement is not related to how much they stick to the stationary phase.
d. parts that stick more to the stationary phase move more slowly.
simple reasoning

1. the passage compares chromatography to sorting toys. in this analogy, what aspect of chromatography does the playground represent?

a. the different types of chromatography available.
b. the stationary phase, where some parts of the mixturestick around,
c. the mobile phase, which carries the mixture,
d. the mixture being separated into different parts.

Explanation:

• Question 1: Chromatography is a technique used to separate mixtures. Option D is correct as it states the main purpose of separating mixtures into individual components. Options A (creating new elements), B (measuring liquid temperature), and C (combining substances) are not related to chromatography's main function.
• Question 2: In chromatography, the two main phases are the stationary phase and the mobile phase. The mobile phase can be a liquid or gas. The solid phase is not a type of phase used in chromatography. So, option B is the answer.
• Question 3: Chromatography can be used to analyze substances in water, food, and bodies. Option D is correct. Options A (predicting weather), B (creating new medicine - while chromatography can aid in drug analysis, the option is too broad), and C (determining rock age) are not typical uses of chromatography.
• Question 4: Components that interact more (stick more) with the stationary phase move more slowly. Option D is correct. Option A is wrong as components move at different speeds. Option B has the speed - interaction relationship reversed. Option C is incorrect as the speed is related to the interaction.
• Question 5: In the analogy of sorting toys, if we consider the 'playground' as a place where things interact. In chromatography, the stationary phase is where components can'stick around'. So, option B is correct. Option A (different types of chromatography) is not represented by the 'playground'. Option C (mobile phase - which is more like the carrier, not the 'playground'). Option D (the mixture being separated) is not what the 'playground' represents.

Answer:

1. D. To separate mixtures into their individual components
2. B. Solid phase
3. D. To find out what's in our water, food, and bodies
4. D. Parts that stick more to the stationary phase move more slowly
5. B. The stationary phase, where some parts of the mixture'stick around'