Act Practice

A student claims that nitrogenous bases pair randomly with one another. Which of the following statements in the passage contradicts the student’s claim?

• Lines 5-6 (“To each... types”)

• Lines 9-10 (“So far... irregular”)

• Lines 23-25 (“The bases... other”)

• Lines 27-29 (“One member... chains”)

Tags

NGSS.HS-LS1-1

A hospital stores one type of medicine in 2-decagram containers. Based on the information given in the box above, how many 1-milligram doses are there in one 2-decagram container?

• 0.002

• 200

• 2,000

• 20,000

Please use the information on the board to answer the question

• A.

• B

• C

• D

Answer explanation

• A. 1.8 L

• B. 2.2 L

• C. 4.0 L

• D. 5.0 L

Answer explanation

Consider the molar volumes of He, Ar, H_2, and N_2 listed in Table 2 at 323 K. What is the order of these gases from the gas having the smallest molar volume to the gas having the largest molar volume?

• F. Ar, Ge, N_2, H_2

• G. Ar, N_2, He, H_2

• H. H_2, He, N_2, Ar

• J. H_2, N_2, He, Ar

Answer explanation

• A. He

• B. Ar

Answer explanation

In a gas sample, collisions between gas particles are common. The average time in a gas particle spends between one collision and the next is called the mean free time. In general, mean free time decreases as a samples volume decreases. Based on Table 1, the mean free time would be least for a 1 mol sample of which gas at which pressure?

• A. He at 0.500 atm

• C. He at 100.0 atm

Answer explanation

• The 18 L sample, because it's at the lower temperature

• The 18 L sample, because it's at the higher temperature

• The 63 L sample, because it's at the lower temperature

•  The 63 L sample, because it's at the higher temperature

Answer explanation

Tags

NGSS.HS-PS1-5

Question 7 is on the board with data:

• A

• B

• C

• D

Answer explanation

Please use the information on the board

• F.

• G.

• H.

• I.

Answer explanation