Answer:
1. From water vapor to the dry ice;
2. The potential energy is higher before the water vapor condenses;
3. The thermal energy is higher in the 2.0 kg block.
Explanation:
1. The heat flows from the system with high temperature to the system with low temperature. The water vapor is at 298 K, and the dry ice is at 194.5 K.
2. The energy of the molecules is related to the temperature and the physics state. At the gas state, the molecules are more agitated, and the energy is higher than the liquid state. So, when the vapor condenses to a liquid, the energy decreases.
3. The thermal energy can be calculated by:
Q = m*c*ΔT
Where m is the mass, c is the specific heat, and ΔT the variation in the temperature. So, when the mass increase, thermal energy also increases.
How many times has it halved?
24/2 = 12
12/2 = 6
6/2 = 3
It halved three times.
It halves once every 6 hours.
18 hours have passed.
Answer:
f = 5.25 x 10³⁸ s⁻¹
Explanation:
Energy = 348KJ = 348,000 J
Frequency = ?
Energy and frequency are related by the equation below;
E = hf
where h = Planck's constant = (6.626 x 10-34 J · s),
Upon making f subject of formular;
f = E / h
substituting the values, we have;
f = 348,000 / 6.626 x 10-34
f = 52,520 x 10 ³⁴ s⁻¹
f = 5.25 x 10³⁸ s⁻¹
For the first task, lighting a campfire can be used. Quantities of firestarter and kindling do not need to be precise. For the second task, the process of titration can be used. In a titration, the precise amount of a substance may be determined by adding a precise amount of a reactive species
