Chemistry NCFE 2018-19 #16-28

16) Which three elements are arranged according to increasing electronegativity values?

• N, C, B

• N, P, As

• N, O, F

• F, O, N

17) Which group of elements is arranged in order of increasing atomic radii?

• O, S, Se, Te

• Fe, Ni, Ag, Au

• Rb, K, Na, Li

• Y, Zr, Nb, Mo

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

18) Which statement describes equilibrium between liquid water and water vapor?

• The rate of vaporization equals the rate of condensation.

• The rate of vaporization is greater than the rate of condensation.

• The rate of vaporization equals the rate of sublimation.

• The rate of vaporization is greater than the rate of sublimation.

19) Which choice describes the state of the substance at X?

• A boiling liquid is in equilibrium with its vapor.

• A subliming solid is in equilibrium with its vapor.

• A freezing liquid is in equilibrium with its solid.

• A melting solid is in equilibrium with its liquid.

20) A sample of metal has a mass of 5.2 g and absorbs 20.0 J of energy as it is heated from 30.0°C to 40.0°C. What is the identity of the metal?

• iron

• gold

• copper

• magnesium

Tags

NGSS.HS-PS3-4

21) A 2.0-liter closed container holds 1.0 mole of an ideal gas at a certain temperature and pressure. Which closed container will hold 3.0 moles of this ideal gas at the same temperature and pressure?

• a 3.0-liter container

• a 6.0-liter container

• a 9.0-liter container

• a 12.0-liter container

22) What is the condition of the sample at point X?

• The sample is in a gaseous state.

• The sample is in a liquid state.

• The sample is at its critical point.

• The sample is at its triple point.

23) What is the approximate temperature of 1.4 moles of a gas with a pressure of 3.25 atmospheres in a 4.738-liter container?

• 180 K

• 170 K

• 150 K

• 130 K

24) Which choice would be changed by the addition of a catalyst to the reaction?

• R

• S

• T

• U

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

25) A student conducts the following demonstration:

• A 15-g sample of NaHCO₃ is placed in a test tube.

• The bottom of the test tube is heated with an open flame.

• Condensation forms on the inside walls of the test tube.

• A burning splint is extinguished when placed at the mouth of the test tube.

What can the student conclude after conducting this demonstration?

• The burning splint was extinguished because of a lack of CO₂ in the

  test tube.

• The burning splint was extinguished because of a lack of H₂O vapor.

• Decomposition produced CO₂ and H₂O.

• Combustion produced O₂ and H₂O.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5