What is radioactivity.
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Related Questions
A gas is initially at a pressure of 225 kPa and a temperature of 245 K in a container that is 4.5 L. If the gas is compressed to a volume of 2.1 L and the temperature changes to 275 K, what is the new pressure?
How many neutrons does an atom ofCopper have in its nucleus?
Up to a point, the elongation of a spring is directly proportional to the force applied to it. Once you extend the spring more than 10.0 centimeters, however, it no longer follows that simple linear rule. What force will result in stretching the spring 10.0 centimeters?A.1.2 newtonB.2.2 newtonC2.5 newtonD.3.5 newton
C2H5OH is able to dissociate in water to conduct an electric current. This compound could be classified as
c. When the interviewer is looking for a spontaneous response from the interviewee.
b. When the interviewee is shy.
d. none of these
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Answer: Option (A) is the correct answer.
Explanation:
When the questions are technical and may require some research from the interviewee then an interviewer want to provide the interviewee a list of questions before the interview.
As only in this case, interviewer wants the interviewee to take some time in order to think about the particular question and then answer it appropriately.
As if there is no list of questions then there are changes that interviewee will forget about some useful point which is important to keep in mind before answering.
Answer:
A
Explanation:
B. It increases.
C. It does not change.
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Answer:
B. It increases.
Explanation:
The kinetic energy is associated with the motion of the particles of a substance.
When the temperature increases, the movement will increase, which means that the velocity of the particles will increase.
According to the mathematical defenition of kinetic energy
The higher the velocity, the higher the kinetic energy.
If the matter is made by a monoatomic gas, the relation between the kinetic energy and temperature is even more evident:
R: gas constant
Na: Avogadro's number
T: temperature
B. it increases.
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The frequency of collisions between the N₂ and H₂ molecules will decrease and the rate of reaction will also decrease.
Since the water is cooler than the gas mixture, heat will flow from the gas to the water.
The gas will cool down, so the average kinetic energy of the gas molecules will decrease.
The molecules will be moving more slowly, so there will be fewer collisions and fewer of these collisions will have enough energy to react.
The rate of reaction between H₂ and N₂ molecules at room temperature is exceedingly slow, but cooling the gas mixture will make the reaction even slower.
Answer:
A beaker containing a mixture of N2(g) and H2(g) is cooled by placing it in a tray of cold water. In response to the cooling, the likely number of collisions between the molecules of N2(g) and H2(g) will decrease. The rate of the reaction will decrease.
Explanation:
#platofam
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Answer:
Q = 1760 cal or 7356.8 J
Explanation:
The general expression to use to calculate heat is the following:
Q = m*Cp*ΔT (1)
Where:
Q = heat in cal or joules
m = mass of the compound.
Cp = specific heat of the compound
T: change in temperature (K) or T2 - T1
Now, the reported Cp for water is 1 cal/g °C and 4.18 J / g °C, we will use both to calculate the heat in calories and joules:
Using calories we have:
Q = 32 * 1 * (80 - 25)
Q = 1760 cal
This is the heat in calories.
Using joules we have:
Q = 32 * 4.18 * (80 - 25)
Q = 7356.8 J
This is the heat expressed in Joules.
(32.0g)(4.18J/g°C)(55°C)= 7360J
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Answer: the canola oil.
Explanation:
According to the melting points reported, at 5°C canola oil, whose melting point is 10°C, will freeze (become solid), while the other three, corn oil, sunflower oil, and peanut oil, having melting points several degrees below 5°C, will remain in liquid state.
Therefore, by decantation or filtration, which are processes that permit separate solids from liquids in a mixture, you can separate easily the solid canola oil from the other three liquid oils.
After separating the canola oil, If you continue cooling the mixture and reach a temperature of - 5°C. the peanut oil, whose melting point is -2°C, whill freeze and you will be able to separate it (again by decantation or filtration).
The same operation, cooling a third time until a temperature around 12°C, will permit you to separate the remaining two oils.
As you see, the knowledge of the physical properties of the substances is a useful tool to separate mixtures.
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Hope that answered your question.