PLEASE HELP!! ILL MARK BRAINLYEST!!New substances are produced in a chemical change.
True
False
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A box containing a piece of wood and enough air to burn the wood is measured and found to have a mass of 1.5 kg. If the wood is burned and none of the smoke, ashes, or hot gases are allowed to leave the box, then how will the mass of the box compare to the mass before burning? Will it be more, less, or the same? A. More B. Less C. The same
b. 1 unit
c. 75 units
d. m149 units
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Answer;
1 unit
Explanation;
- Interference of a wave is the property a wave that occurs when two waves travelling in the same medium meet at a point or superpose at a point in the medium.
- Interference may be constructive or destructive. Constructive occurs when two identical waves travelling in the same medium in phase meet at a point. The resulting wave has twice the amplitude of the individual waves.
- Destructive interference occurs when two waves travelling in the same medium meet and out of phase. The resulting amplitude will be zero if the initial waves are identical, or the difference between the amplitude of the original waves if they are not identical.
- Therefore; If the two waves one with an amplitude 75 units and the other 74 units, are out of phase with each other, the resultant amplitude of the resulting wave will be 1 unit, the difference between the amplitude of the original waves.
out of phase (180° apart), then the resultant wave will have the
same frequency and an amplitude of 1 unit.
If the two waves do not have the SAME FREQUENCY, then their
relative phase is meaningless.
B.high density, low humidity
C.low density, low humidity
D.low density, high humidity
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A
Source: Meteorologist/Storms spotter & chaser
Answer:
A (high density and high humidity)
Explanation: Hope this helps :)
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Answer:
15 m/s
Explanation:
Initial velocity, u = 0
Acceleration of bear, a = 2.5 m/s²
We need to find time taken by bear to reach a velocity of 15 m/s.
Acceleration is equal to the rate of change of velocity. So,
It will take 6 seconds to reach a velocity of 15 m/s.
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Answer:
The enthalpy for dissolution is - 305.558 J/g
Solution:
Mass of the ionic compound, m = 10.00 g
Mass of water, m' = 75.0 g
Initial temperature, T =
Final Temperature, T' =
Now,
To calculate the change in enthalpy:
We know that the specific heat of water is 4.18
Total mass of the solution, M = m + m' = 10.00 + 75.0 = 85.0 g
Temperature, difference,
Thus
The heat absorbed by the solution is given by:
Enthalpy,
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1. The volume will increase.
2. The change in the volume is 73 mL
1. Determination of the nature of the new volume.
From the question given above, the following data were obtained:
- Initial volume (V₁) = 200 mL
- Initial temperature (T₁) = 0 °C = 0 + 273 = 273 K
- New temperature (T₂) = 100 °C = 100 + 273 = 373 K
- New volume (V₂) =?
Using the Charles' law equation, the new volume of the cylinder can be obtained as follow:
V₁ / T₁ = V₂ / T₂
200 / 273 = V₂ / 373
Cross multiply
273 × V₂ = 200 × 373
273 × V₂ = 74600
Divide both side by 273
V₂ = 74600 / 273
V₂ ≈ 273 mL
From the above calculation, we can see that the new volume increased.
2. Determination of the change in the volume.
The change in the volume can be obtained as illustrated below:
- Initial volume (V₁) = 200 mL
- New volume (V₂) = 273 mL
- Change in volume (ΔV) =?
ΔV = V₂ – V₁
ΔV = 273 – 200
ΔV = 73 mL
Learn more about Charles' law: