Answer:
engineers use knowledge of heat of reaction to predict how much energy will be produced in a chemical system, which is important for keeping the reactor safe and efficient. Beyond chemical reactions, heat is exchanged for physical reactions, too.
Answer:
K^+(aq) + Br^-(aq) -----> KBr(aq)
Explanation:
The net ionic equation shows the actual reaction that occurs in the system. The molecular reaction equation includes the spectator ions but the net ionic equation does not include the spectator ions.
Spectator ions do not participate in the main reaction going on in the system.
Hence, for the reaction of potassium hydroxide and ammonium bromide, we have;
K^+(aq) + Br^-(aq) -----> KBr(aq)
Decrease in temperature is -126.0°C
<u>Explanation:</u>
Using Charles law we can set up the equation as,
V₁/T₁ = V₂/T₂
(2.00 L) / 294.0 K) = (1.00 L) / (x)
cross multiply to get:
2x = 294
2x/2 = 294/2
x = 147.0 K
Now kelvin is converted into Celsius by subtracting 273 from 147 as,
147 - 273 = -126°C
The nails would be used as they're made of iron:)
Answer:
A metallic bonding holds the particles of the substance together
Explanation:
<em><u>The unknown substance is a metal</u></em>:
- It is easily bent: This means it is ductile, as it is the case with a thin metallic metallic wire.
- "When the substance is placed in a n electric circuit and the switch is closed, and LED light turns on." <em>This means it easily conducts electricity</em>. Metals are good conductors.
