CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-7 mol/L. Its pH is:
A. 6
B. 9
C. 7
D. 8
Correct Answer: C
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-6 mol/L. Its pH is:
A. 6
B. 7
C. 5
D. 8
Correct Answer: A
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-5 mol/L. Its pH is:
A. 5
B. 6
C. 7
D. 4
Correct Answer: A
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-4 mol/L. Its pH is:
A. 5
B. 3
C. 6
D. 4
Correct Answer: D
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-3 mol/L. Its pH is:
A. 5
B. 4
C. 2
D. 3
Correct Answer: D
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-2 mol/L. Its pH is:
A. 4
B. 2
C. 3
D. 1
Correct Answer: B
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-1 mol/L. Its pH is:
A. 3
B. 1
C. 2
D. 0
Correct Answer: B
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Increasing temperature usually increases rate because particles have:
A. lower collision frequency always
B. less motion
C. zero activation energy
D. more kinetic energy and more effective collisions
Correct Answer: D
Higher T increases energetic collisions.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A catalyst increases rate mainly by:
A. changing equilibrium constant
B. being consumed stoichiometrically
C. lowering activation energy
D. raising product energy permanently
Correct Answer: C
Catalysts lower activation energy.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Reduction is commonly:
A. gain of electrons
B. loss of electrons
C. loss of neutrons
D. gain of oxygen in every case
Correct Answer: A
Reduction = electron gain.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Oxidation is commonly:
A. loss of protons only
B. gain of electrons
C. gain of neutrons
D. loss of electrons
Correct Answer: D
Oxidation = electron loss.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Strong acid + strong base neutralization typically produces:
A. ammonia only
B. oxygen and carbon
C. metal and hydrogen only
D. salt and water
Correct Answer: D
Neutralization forms salt and water.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Phenolphthalein is typically pink in:
A. pure alcohol only
B. neutral salt only
C. strongly acidic solution
D. basic solution
Correct Answer: D
Phenolphthalein is pink in basic solution.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Blue litmus in acid turns:
A. Green
B. Red
C. Black
D. Colorless
Correct Answer: B
Acids turn blue litmus red.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution with pH 11 is:
A. Neutral
B. Basic
C. Always saturated
D. Acidic
Correct Answer: B
pH above 7 is basic.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, neutral pH is about:
A. 14
B. 1
C. 0
D. 7
Correct Answer: D
Neutral water has pH≈7.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A Brønsted-Lowry base is a:
A. photon donor
B. proton acceptor
C. neutron acceptor
D. proton donor
Correct Answer: B
A Brønsted base accepts H+.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A Brønsted-Lowry acid is a:
A. neutron donor
B. proton acceptor
C. electron-pair donor only
D. proton donor
Correct Answer: D
A Brønsted acid donates H+.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
An Arrhenius base increases:
A. nuclear protons
B. OH− in water
C. chloride always
D. H+ only
Correct Answer: B
Arrhenius bases increase OH−.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
An Arrhenius acid increases:
A. electrons
B. H+ (or H3O+) in water
C. neutrons
D. OH− only
Correct Answer: B
Arrhenius acids increase H3O+.