# Electrolytes (Grade 9)

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## Electrolytes

1.

Which of the following statements correctly describes electrolytes?

- Electrolytes always contain metals
- Electrolytes all have a pH value of 7
- Electrolytes have low melting points
- Electrolytes are strong conductors of electricity in solution

2.

Which of the following statements is NOT true about electrolytes?

- They conduct electricity in solution
- They conduct electricity in the solid phase
- They typically will form positively-charged and negatively-charged particles in solution
- None of the above

3.

Which of the following is an electrolyte?

- Cu
- [math] H_2S [/math]
- ICl
- HCl

4.

Which of the following is an electrolyte?

- [math] Ca(OH)_2 [/math]
- [math] H_2 [/math]
- K
- [math] SO_2 [/math]

5.

Which of the following is a nonelectrolyte?

- [math] CH_3 COOH [/math]
- KOH
- [math] H_2 SO_4 [/math]
- [math] C Cl_4 [/math]

6.

Which of the following compounds is NOT an electrolyte?

- ethanoic acid
- sodium bicarbonate
- methanol
- sodium hydroxide

7.

Based on considerations of solubility, which of the following salts would be the weakest electrolyte?

- [math] NaClO_3 [/math]
- [math] CaCl_2 [/math]
- [math] Na_2 SO_4 [/math]
- AgCl

8.

Which of the following represents the ions present in an aqueous solution of [math] H_3 PO_4 [/math]?

- [math] H_3 O^[+] [/math] and [math] PO_4^[3-] [/math]
- [math] H^[+] [/math] and [math] PO_4^[+] [/math]
- [math] H^[-] [/math] and [math] PO_4^[3+] [/math]
- [math] H^[+] [/math] and [math] PO_4^[3-] [/math]

9.

Complete the following equation for the dissociation of HCl:

HCl (aq) [math] rarr [/math] ?

HCl (aq) [math] rarr [/math] ?

10.

Complete the equation for the dissociation of a base:

NaOH (aq) [math] rarr [/math] ?

NaOH (aq) [math] rarr [/math] ?

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