Warm up Week 3

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

26) A chemical equation is shown below.

CaSO₄ + AlBr₃ → CaBr₂ + Al₂(SO₄)₃

What will be the coefficient of CaBr₂ when the equation is balanced using the smallest possible whole-number coefficients?

• 2

• 3

• 4

• 5

Tags

NGSS.HS-PS1-7

27) The equation below represents a chemical reaction.

Zn (s) + 2HCl (aq) → ZnCl₂ (aq) + H₂ (g)

A 5.00-g sample of zinc is added to hydrochloric acid. The amount of hydrochloric acid is sufficient to allow the zinc to react completely. What mass of hydrogen gas does this reaction produce?

• 0.0308 g

• 0.0771 g

• 0.121 g

• 0.154 g

Tags

NGSS.HS-PS1-7

28) What is the molecular formula of a compound with the empirical formula CH₂O and a molecular mass of 60 g/mol?

• CH₂O

• C₂H₄O₂

• C₂H₄O₄

• C₂H₂O₂

29) What can the student conclude about the experiment?

• A chemical reaction occurred because new atoms were created.

• A chemical reaction occurred because a new substance was formed.

• The popping sound provided evidence that the acid changed physical states.

• The popping sound provided evidence that the magnesium atoms were

  destroyed.

Tags

NGSS.MS-PS1-2

30) How many O₂ particles are in 2.50 moles of O₂ at Standard Temperature and Pressure (STP)?

• 4.15 × 10²² particles

• 2.41 × 10²³ particles

• 5.02 × 10²³ particles

• 1.51 × 10²⁴ particles

Tags

NGSS.HS-PS1-7