Answer:
This time, a hot metal spoon is put in room-temperature water.
Explanation:
The faster-moving atoms in the spoon contact the slower-moving molecules in the water. The atoms in the spoon transfer some of their energy to the molecules in the water. The spoon will get cooler and the water will get a little warmer.
Data:
![M_{concentrated} = 2.5\:mol](https://tex.z-dn.net/?f=M_%7Bconcentrated%7D%20%3D%202.5%5C%3Amol)
![V_{concentrated} = ?](https://tex.z-dn.net/?f=V_%7Bconcentrated%7D%20%3D%20%3F)
![M_{dilute} = 0.50\:mol](https://tex.z-dn.net/?f=M_%7Bdilute%7D%20%3D%200.50%5C%3Amol)
![V_{dilute} = 100\:mL\to0.100\:L](https://tex.z-dn.net/?f=V_%7Bdilute%7D%20%3D%20100%5C%3AmL%5Cto0.100%5C%3AL)
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Formula: Dilution Calculations
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![M_{concentrated} * V_{concentrated} = M_{dilute} * V_{dilute}](https://tex.z-dn.net/?f=M_%7Bconcentrated%7D%20%2A%20V_%7Bconcentrated%7D%20%3D%20M_%7Bdilute%7D%20%2A%20V_%7Bdilute%7D%20)
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Solving:
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![M_{concentrated} * V_{concentrated} = M_{dilute} * V_{dilute}](https://tex.z-dn.net/?f=M_%7Bconcentrated%7D%20%2A%20V_%7Bconcentrated%7D%20%3D%20M_%7Bdilute%7D%20%2A%20V_%7Bdilute%7D%20)
![2.5 * V_{concentrated} = 0.50 * 0.100](https://tex.z-dn.net/?f=2.5%20%2A%20V_%7Bconcentrated%7D%20%3D%200.50%20%2A%200.100%20)
![2.5V_{concentrated} = 0.05](https://tex.z-dn.net/?f=2.5V_%7Bconcentrated%7D%20%3D%200.05)
![V_{concentrated} = \frac{0.05}{2.5}](https://tex.z-dn.net/?f=V_%7Bconcentrated%7D%20%3D%20%20%5Cfrac%7B0.05%7D%7B2.5%7D%20)
![\boxed{\boxed{V_{concentrated} = 0.02\:L\:or\:20\:mL}} \end{array}}\qquad\quad\checkmark](https://tex.z-dn.net/?f=%5Cboxed%7B%5Cboxed%7BV_%7Bconcentrated%7D%20%3D%200.02%5C%3AL%5C%3Aor%5C%3A20%5C%3AmL%7D%7D%20%5Cend%7Barray%7D%7D%5Cqquad%5Cquad%5Ccheckmark)
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The so-called photoelectric effect
Answer:
No
Explanation:
A single property is not conclusive for identifying a substance. For example, conductivity. Copper, aluminum, and lead all conduct electricity, yet they have different atomic number, electronegativity, and physical properties, thus their shared property of conducting electricity is not enough to correctly identify each substance.