Texas UIL Chemistry

What can you say about an atom that has the electron configuration 1s²2s²2p⁵3s¹?

• It has absorbed energy from its surroundings.

• It forms one single bond with other atoms

• It is an anion.

• It is a cation.

• It is an alkali metal.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Arrange these compounds in order of increasing melting point: BaS, KCl, LiF, NaCl, CaO

• CaO < BaS < LiF < KCl < NaCl

• NaCl < KCl < LiF < BaS < CaO

• LiF < NaCl < KCl < CaO < BaS

• BaS < CaO < KCl < NaCl < LiF

• KCl < NaCl < LiF < BaS < CaO

4.65 mol of a metal oxide has a mass of 712.98 g. Which compound is it?

• MoO₃

• SnO₂

• Cr²O³

• BaO

• Fe₂O₃

Tags

NGSS.HS-PS1-7

What is the sum of the coefficients in the balanced redox reaction when Au3+ and I – react in solution to form elemental products?

• 5

• 6

• 8

• 9

• 13

Tags

NGSS.HS-PS1-7

3.45 g Na is added to a 2.5 L container containing 744 torr of Cl2 gas at 25°C, then a small amount of water is added to initiate the reaction. Assuming the reaction goes to completion, what is the mass of NaCl formed?

• 5.84 g

• 6.38 g

• 6.97 g

• 8.77 g

• 11.7 g

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In a mixture of two different ideal gases, particles with different masses will have

• The same average kinetic energy and the same root mean square velocity.

• The same average kinetic energy, but different root mean square velocities.

• Different average kinetic energies, but the same root mean square velocity.

• Different average kinetic energies and different root mean square velocities.

• Answers A and B are both possible depending on the nature of the two gases.

Tags

NGSS.HS-PS3-2

If you drop a piece of potassium metal into water the following exothermic reaction occurs:

2K(s) + 2H₂O(l) --> 2KOH(aq) + H₂(g)

What are the values of q and w for this reaction, at constant temperature and pressure?

• q is positive and w is negative.

• q is negative and w is positive.

• q and w are both negative.

• q and w are both positive.

• There is not enough information given.

Tags

NGSS.HS-PS1-4

A 10.0 mL sample of a sulfuric acid solution of unknown concentration is diluted to 25.0 mL and then titrated to the phenolphthalein endpoint using 35.88 mL of 0.155 M NaOH. What is the concentration of the sulfuric acid solution?

• 0.111 M

• 0.222 M

• 0.278 M

• 0.444 M

• 0.556 M

Tags

NGSS.HS-PS1-5

Which of the phase diagrams below best corresponds to the compound shown here?

• 
• 
• 
• 
• 

Tags

NGSS.HS-PS3-4

A careless lab assistant misreads the labels on two bottles, and thinking they contain the same reagent, adds 100 mL of 0.50 M AlCl3 to 250 mL of 0.50 M AgClO3. What is the final silver ion concentration in the mixed solution?

• 2.5 X 10^-9 M

• 1.3 X 10^-5 M

• 8.4 X 10^-5 M

• 0.33 M

• 0.071 M

Tags

NGSS.HS-PS1-5