Unit 7 acids and bases chemistry test

B

A sample of pure water contains... A. Neither OH- ions nor H3O+ ions B. Equal consentratioms of OH- and H3O+ ions C. A larger consentrations of H3O+ ions than OH- ions D. A smaller concentrations of H3O+ ions than OH- ions

C

A teacher demonstrated the possible effects of acid rain by placing several types of rocks in separate beakers containing a vinegar solution with a pH of 3. As time passes solution gradually reaches a pH of 7. Which vest explains this variation of pH in this demonstration. A. All solutions are eventually reach a pH of 7, so the experiment is not done B. Vinegar is organic compound that's unpredictable with inorganic rocks C. Rocks have carrying chemical combustion so some but not all react with acid D. Student should have measured pH immediately after mixing science acid rain reacts quickly with nature

A

A water sample was found to have pH of 6 at 25 degress c. What is the hydrooxide concentration in the water sample A. 1•10^-8m B. 6•10^-8m C.1•10^-6m D. 6•10^-6m

A

Acording to the brönsted-Lowery theiry, an acid is... A. A proton donor B. A proton acceptor C. An electron donor D. An electron acceptor

C

Equal volumes of 1 moler hydrochlorix acid (HCl) and 1 moler sodium hydroxide base (NaOH) are mixed. After mixed, the solution will be... A. Stringly acidic B. Weekly acidic c. Nearly neutral D. Weekly basic

A

In a solution, itmus is blue. The pH of the solution could be... A.10 B.2 C.3 D.4

C

In the reaction HCl + H2O—> H3O+ + Cl-, a conjugate acid-base pair is... A. HCl and H3O+ B. HCl and H2O C. HCl and Cl- D. H2O and cl-

D

In the reaction of Hydrobromic acid (HBr) and ammonia (NH3), ammonia acts as a bronsted base. Which of the following ions is formed? A. N+ B. NH2- C. NH^- 2 D. NH^+ 4

A

Phenophthalein is an indicator that turns pink whwn added to basic solution. In which solition would it turn pink? a. NaOH b. HCl C. H2O D. Nacl

B

The compound Mg(OH)2 is classified as an Arrhenius base becouse, when the compound dissolves in water, there is an increase in the consentration of which of the following ions? A. Hydrogen ions B. Hydroxide ions C. Magnesium ions D. Oxide ions

B

The equation below represents the reaction of hydrogen iodide with water HI+ H2O —> H3O+ + I- what reactions in this equation acts as a Bronoted base A. HI B. H2O C. HO+3 D. I-

C

The water from hot springs near the ebeko volcano in the Pasific Ocean has a very low pH. A low pH indicates which of thr following about the water? A. It has no detectable H+ or OH- ions B. It has equal consentrations of H+ ions C. It has high consintration of H+ ions D. It has equal number of + and - ions

D

Unlick am acid, an aqueous solution of a base... A. Couses some indicators to chamge color B. Conducts electricity C. Contaions more H+ ions than OH- ions D. Contains more OH- ions than H+ ions

D.

What is the pH of a solution of KOh woth a hydroxide consentration of [OH]=1•10^-4m A. -10 B.-4 C. 4 D.10

D

Which compound reacts with an acid to form a salt and water compound? A. CH3Cl B. CH3COOH D. KCl D. KOH

B

Which equatoon illistrates the amphiprotic properties of a reactant species? A. NH3(aq) + H2O(l)—> NH4(aq) + OH-(aq) B. H2O(l) + H2O(l)—> H3O+(aq)+ OH- C. HCl(aq)+H2O—> H3o+(aq) + Cl-(aq) D. 2H2(g) + O2(g) —> 2H2O(l)

B

Which is a characteristic kf a strong acid A. It has a pH greater than 7 B. It compleatly ionozes in the solution C. It contains many hydrooxide ions D. It reacts only with a strong base

A

Which pH value represents a solution with the lowest OH- ion consentration? A.1 B.7 C.10 D.14

D

Which process uses a volume of solution of known concentrations to determain the concentration of another solution? A. Distiliation B. Substitution C. Transmutation D. Titation

D

Which substance woild most neutralize ans acidic food? A. Dairy (pH 5-7) B. Water (pH 6-7) C. Citrus fruit (pH 2-3) D. Backing soda (pH 8-9)