Question

question 10
2 k + 2 h₂o --> 2 koh + h₂
double replacement reaction
synthesis reaction
decomposition reaction
combustion reaction
single replacement reaction
question 11
2 pts
3 agno₃ + k₃po₄ --> ag₃po₄ + 3 kno₃
combustion reaction
double replacement reaction
synthesis reaction
single replacement reaction
decomposition reaction
question 12
2 pts
8 cu + s₈ --> 8 cus
decomposition reaction
double replacement reaction
single replacement reaction
combustion reaction
synthesis reaction

Explanation:

Question 10

Step1: Recall reaction types

Single replacement: \( A + BC
ightarrow AC + B \). Double: \( AB + CD
ightarrow AD + CB \). Synthesis: \( A + B
ightarrow AB \). Decomposition: \( AB
ightarrow A + B \). Combustion: involves \( O_2 \) and energy.

Step2: Analyze \( 2K + 2H_2O

ightarrow 2KOH + H_2 \)
K (A) replaces H (B) in \( H_2O \) (BC) to form KOH (AC) and \( H_2 \) (B). Matches single replacement.

Step1: Recall reaction type definitions

Double replacement: ions swap. \( AB + CD
ightarrow AD + CB \).

Step2: Analyze \( 3AgNO_3 + K_3PO_4

ightarrow Ag_3PO_4 + 3KNO_3 \)
\( Ag^+ \) (from \( AgNO_3 \)) swaps with \( K^+ \) (from \( K_3PO_4 \)), forming \( Ag_3PO_4 \) and \( KNO_3 \). Matches double replacement.

Step1: Recall reaction type definitions

Synthesis: \( A + B
ightarrow AB \).

Step2: Analyze \( 8Cu + S_8

ightarrow 8CuS \)
Copper (Cu) and sulfur (\( S_8 \)) combine to form copper sulfide (CuS). Matches synthesis (combination) reaction.

Answer:

Single replacement reaction

Question 11