Free PAX (RN) Questions and Answers — Questions and Answers

Question 1: Writing down chemical processes is called .

From top to bottom
It doesn't matter how you write a chemical reaction.
From left to right (Correct answer)
From right to left

Correct answer: From left to right

Chemical reactions are typically written from left to right. The reactants, which are the substances that undergo a chemical change, are written on the left side of the reaction arrow. The products, which are the new substances formed as a result of the reaction, are written on the right side of the arrow. The arrow itself represents the direction of the reaction.

Question 2: Why does activation energy exist?

The transition state between reactants and products
The minimum amount of energy required for a reaction to proceed (Correct answer)
A molecule that lowers the barrier to a reaction proceeding
The total change in energy of a chemical reaction

Correct answer: The minimum amount of energy required for a reaction to proceed

Activation energy is the minimum amount of energy required for a chemical reaction to occur and for the reactant molecules to transform into products. It represents the energy barrier that must be overcome for the reaction to proceed.

Question 3: A strong acid is which of the following?

OH-
HCl (Correct answer)
CH3COO-
CH3COOH

Correct answer: HCl

HCl (hydrochloric acid) is indeed a strong acid.

Question 4: Out of 222, what percentage is 122?

50 percent
30 percent
55 percent (Correct answer)
64 percent

Correct answer: 55 percent

To calculate the percentage of 122 out of 222, you can use the following formula: (122 / 222) * 100 Dividing 122 by 222 gives us 0.5495. Multiplying this by 100 gives us 54.95. Therefore, 122 out of 222 is approximately 54.95 percent.

Question 5: In only five minutes, a burrito artist can create 14 burritos. In one hour, how many burritos can she produce?

168 (Correct answer)
840
70
60
140

Correct answer: 168

To find out how many burritos the burrito artist can make in one hour, we need to determine the number of 5-minute intervals in an hour. There are 60 minutes in an hour, and since the artist can make 14 burritos in 5 minutes, the number of burritos made in one hour can be calculated as follows: Number of burritos in one hour = (Number of burritos in 5 minutes) * (Number of 5-minute intervals in an hour) Number of burritos in one hour = 14 * (60 / 5) Number of burritos in one hour = 14 * 12 Number of burritos in one hour = 168 Therefore, the burrito artist can make 168 burritos in one hour.

Question 6: The evolutionary ancestor of both fungus and plants, according to scientists, was:

Animals
Protists (Correct answer)
Archaebacteria
Monera
Eubacteria

Correct answer: Protists

Scientists hypothesize that the evolutionary ancestor of both plants and fungi was a group of protists. Protists are a diverse group of eukaryotic microorganisms that do not fit into the kingdoms of animals, plants, or fungi. They exhibit a wide range of characteristics and lifestyles, including photosynthetic capabilities like plants and heterotrophic modes like fungi. The common ancestor of plants and fungi is believed to have diverged from a protist ancestor, eventually leading to the evolution of distinct lineages for plants and fungi.

Question 7: Scientists have proposed that ____ are the evolutionary ancestors of protists that resemble plants, such as red and green algae, based on DNA analysis.

Animal-like protists
Plants
Fungus-like protists
Fungus
Cyanobacteria (Correct answer)

Correct answer: Cyanobacteria

DNA analysis indicates cyanobacteria, photosynthetic prokaryotes, are the evolutionary ancestors of plant-like protists such as red and green algae, having given rise to chloroplasts through endosymbiosis. The other options are either the descendants themselves or unrelated (fungus-like or animal-like) groups.

Free PAX (RN) Questions and Answers

Writing down chemical processes is called .