CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Which chemical equation is best identified by the following reaction type: combination/synthesis reaction?
A. HCl + NaOH → NaCl + H2O
B. 2H2 + O2 → 2H2O
C. CaCO3 → CaO + CO2
D. CH4 + 2O2 → CO2 + 2H2O
Correct Answer: B
The chemical equation matching 'combination/synthesis reaction' is 2H2 + O2 → 2H2O.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
Which reaction type is correctly associated with 2H2 + O2 → 2H2O?
A. combination/synthesis reaction
B. combustion reaction
C. single-displacement reaction
D. acid-base neutralization
Correct Answer: A
2H2 + O2 → 2H2O is associated with combination/synthesis reaction.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 13. Approximate pOH is:
A. 3
B. 0
C. 2
D. 1
Correct Answer: D
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 12. Approximate pOH is:
A. 1
B. 2
C. 3
D. 4
Correct Answer: B
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 11. Approximate pOH is:
A. 2
B. 3
C. 4
D. 5
Correct Answer: B
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 10. Approximate pOH is:
A. 4
B. 5
C. 6
D. 3
Correct Answer: A
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 9. Approximate pOH is:
A. 4
B. 6
C. 5
D. 7
Correct Answer: C
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 8. Approximate pOH is:
A. 8
B. 5
C. 6
D. 7
Correct Answer: C
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 7. Approximate pOH is:
A. 7
B. 9
C. 6
D. 8
Correct Answer: A
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 6. Approximate pOH is:
A. 8
B. 10
C. 7
D. 9
Correct Answer: A
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 5. Approximate pOH is:
A. 8
B. 11
C. 10
D. 9
Correct Answer: D
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 4. Approximate pOH is:
A. 11
B. 10
C. 9
D. 12
Correct Answer: B
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 3. Approximate pOH is:
A. 12
B. 10
C. 11
D. 13
Correct Answer: C
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 2. Approximate pOH is:
A. 12
B. 13
C. 11
D. 14
Correct Answer: A
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
At 25 °C, pH is 1. Approximate pOH is:
A. 13
B. 15
C. 14
D. 12
Correct Answer: A
pH+pOH≈14.
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-12 mol/L. Its pH is:
A. 12
B. 11
C. 13
D. 14
Correct Answer: A
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-11 mol/L. Its pH is:
A. 10
B. 12
C. 13
D. 11
Correct Answer: D
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-10 mol/L. Its pH is:
A. 9
B. 12
C. 10
D. 11
Correct Answer: C
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-9 mol/L. Its pH is:
A. 9
B. 8
C. 10
D. 11
Correct Answer: A
pH=−log10[H+].
CSS - PMS - CCE - PCS - Everyday Science
AcidsBases and Chemical Reactions
A solution has [H+] = 1×10^-8 mol/L. Its pH is:
A. 10
B. 8
C. 9
D. 7
Correct Answer: B
pH=−log10[H+].