Answer:
Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. ... As a result, the particles take up more volume.
Answer:
The temperature increases from 23.0 C to 37.0 °C
Explanation:
<u>Step 1:</u> Data given
DH = -44.4 kJ/mol
mass NaOH = 13.9 grams
mass of water = 250.0 grams
Initial temperature = 23°C = 295 K
Final temperature = TO BE DETERMINED
Specific heat = 4.18 J/g*K
<u>Step 2: </u>Calculate change in temperature
13.9 grams/ 40 g/mol * 44.4 kJ/mol = 15429 J
15429 J = (massNaOH + mass water) * 4.18 * ΔT
15429 = 263.9 *4.18 * ΔT
ΔT = 14°C
<u>Step 3:</u> Calculate final temperature
ΔT= 14°C = T2 - 23°C
T2 = 23 +14 = 37 °C
The temperature increases from 23.0 C to 37.0 °C
Answer:
A. To focus on only those ions that form the precipitate
Explanation:
Net ionic equations cancel out the ions that appear on both sides of the reaction because they essentially don't participate in the reaction. This is very useful when dealing with redox reactions because are complicated enough without spectator ions being in the way, so they help focus on those ions that actually form the precipitate.
Key Terms
- Spectator Ions: an ion that does not take part in the chemical reaction.
- Net ionic equations: a equation where ions that appear on both sides are canceled out.
- Redox reaction: an oxidation-reduction reaction.
N=A-P
N=14-6
N=8 this is the answer
