QUAL review

Which of the following would help you determine if ions are present in a solution?

• smell (volatility)

• adding an indicator such as PHTH or phenol red

• looking at the test tube directly

• using a conductivity meter

Tags

NGSS.HS-PS2-5

What does the down arrow ↓ symbolize? (a)  

• formation of a gas
• formation of a precipitate
• yields
• in the solid state

Choose all that apply.

Which of the following liquids would cause a conductivity meter to shine brightly?

• HCl

• sucrose

• Pb(NO₃)₂

• Ca(OH)₂

• H₂O

Which shape is used to indicate a conclusion in a flow chart? (a)  

• circle with a number
• parallelogram
• diamond
• rectangle split into two parts

Which shape is used to ask a question that requires a yes/no answer/ (a)  

• circle with number
• parallelogram
• diamond
• rectangle split into two parts

Choose all that apply.

What would be a useful method to identify Ca(OH)₂ as a base?

• add Mg to produce H₂ ↑

• add NaHCO₃ to produce CO₂ ↑

• add PHTH to see if the solution turns bright pink

• add phenol red to see if the solution turns yellow

What is the formula of the yellow precipitate that forms?

• PbI ↓

• PbCl₂ ↓

• CuI₂↓

• NOR

• PbI₂ ↓

True or False?

A valid flow chart question is: Is the solution conductive?

(a)  

Choose all that apply.

Which reagents would form a precipitate with CaI₂?

• Pb(NO₃)₂

• CoCl₂

• PHTH

• CuSO₄

How do you get help during QUAL testing days? (a)  

• raise your hand
• call out to the teacher
• sign up
• wait in line patiently