Question 1

When a compound is heated in a flame it gives off a violet colour. Which element is present?

a)iron

b)potassium

c)copper

d)sodium

Question 2

Which of the following is a non-electrolyte?

a)sodium hydroxide

b)sodium chloride

c)hydrochloric acid

d)sugar

Question 3

What metals could be used in fireworks to produce the colours red, green, and yellow respectively?

a)copper, sodium, and calcium

b)strontium, copper, and sodium

c)calcium, sodium, and copper

d)lithium, calcium, and copper

Question 4

The number of moles of cobalt (II) sulfate in 300 mL of 1.75 mol/L solution is

a)0.525 mol

b)0.552 mol

c)5.83 mol

d)0.171 mol

Question 5

The correct term for referring to the maximum amount of solute that will dissolve under specified conditions to make a unit volume of solution is

a)molarity

b)solution

c)solubility

d)dissociation

Question 6

A student wishes to dilute some 6.00 mol/L HCl to make 5.00 L of 0.0100 mol/L HCl. The volume of 6.00 mol/L solution he should use is

a)12.4 mL

b)8.33 mL

c)4.20 mL

d)50.0 mL

Question 7

When the pH of a solution changes from 10 to 8, the [OH-]

a)increases and the solution becomes more basic

b)decreases and the solution becomes less basic

c)increases and the solution becomes more acidic

d)decreases and the solution becomes less acidic

Question 8 (1 point)

A sample of rainwater is poured into five test tubes. A different indicator is added to each test tube. Four of the observations are recorded in the table below.

Indicator: Color:

methyl red yellow

phenol red yellow

bromocresol green blue

phenolphthalein colourless

bromothymol blue ?

The best estimates of the pH of the rainwater and the predicted colour of the sample containing bromothymol blue are

a)6.0 and yellow

b)7.6 and yellow

c)6.0 and blue

d)7.6 and blue

Question 9

A 0.1 mol/L solution that conducts electricity and turns blue litmus red is

a)SrCl2(aq)

b)CH3Cl(aq)

c)NaCl(aq)

d)HCl(aq)

Question 10

A student pipetted 10 mL of 0.10 mol/L HCl(aq) into 90 mL of distilled water. The pH of the dilute solution was

a)0.95

b)1.95

c)1.00

d)2.00