A mining crew extracted two different types of minerals from the underground. Then, they transferred the same amount of energy into both minerals. Why did mineral A change while mineral B stayed the same? Explain what happened to the molecules of both minerals.
Answers
The plausible reason for the change in mineral A will be the lower activation energy than the transferred energy.
The addition of energy will result in the change in the minerals if the activation energy is exceeded.
The minerals found in mining A and B have transferred the energy. The minimum amount of energy required to do the transition in the atoms in the activation energy.
The possible reason for the change in the mineral A will be the lower activation energy for the mineral A. The mineral B does not change because the activation energy of mineral B is higher as compared to mineral A.
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Answer: Mineral A changed because Molecular energy transferred is equal or greater than than its Activation energy
Mineral B didn't change because Molecular energy transferred is less than its Activation energy.
Explanation:
The molecules of Mineral A has been disturbed by the addition of energy causing a change and the entropy is increased. The Molecules of Mineral B has not been disturbed because the residual energy has not been overcome and therefore yielding no visible change
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decay rate is r= ln2/h. Radium-221 has a half-life of 30 seconds. How long will it take for 90% of a sample to decay = o-rt
Answers
Where lambda is the decay constant
Rewriting we get lambda = ln2 / t1/2
Subbing in 30 seconds as half life we get lambda= 0.0231049 approx.
I assume only mass of radium is what you want.
Hence he have the formula
m=mo e^-lambda x t
Where m is mass after time
Mo is initial mass.
For 90% to decay, m/mo x100% = 90%
Hence m/mo = 0.1 this is because 90% has decays so we are left with 10%
Rearranging, m=mo e^-lambda x t
We obtain
(m/mo)=e^-lambda x t
Subbing in above values we get,
0.1=e^-0.0231049 x t
Take ln on both sides to get
ln(0.1) = -0.0231049 x t
Hence,
t = ln(0.1) / (-0.0231049)
t= 99.65787 s
It takes about 100 seconds for 90% to decay
Answers
Decomposers
Primary consumers
Secondary producers
Answers
Answer: Primary producers
A food chain is a linear series of transfer of food and energy when one organism is consumed by the other organism in an ecosystem. The energy is distributed among different tropic levels of the food chains.
Phytoplankton is a class of unicellular simple, autotrophic organisms which are found in water of ocean, lakes and or any other freshwater body. These includes dinoflagellates, diatoms, cynobacteria, green algae and others. These organisms are abundantly present in the ecosystem in the lower most trophic level. They are called as primary producers because they are consumed by other organisms such as zooplanktons, fishes and large sea mammals.
b. gained.
c. shared.
d. transferred.?
Answers
Covalent bonds share electrons while ionic bonds transfer their electrons.
b....32.6°C
c....115°C
d...388°C
Answers
Gay-Lussacs law states that pressure of a gas is directly proportional to temperature when the volume is kept constant
P / T = k
where P - pressure , T - temperature in kelvin and k - constant
where parameters for the first instance are on the left side of the equation and parameters for the second instance are on the right side of the equation
T1 - 25 °C + 273 = 298 K
substituting the values in the equation
T2 = 388 K
temperature in celcius - 388 K - 273 = 115 °C
answer is C. 115 °C
Answers
The answer is that the substance loses or gains heat.
Answer:
The heat of the substance changes.
Explanation:
Substances can be made to change phases by fluctuating the temperature, the pressure, or both.