An electron dot diagram shows an atom's number of valence electrons
Answer:
It is a physical change.
Explanation:
• This is because when anhydrated copper (ii) sulfate is heated, the water evaporates to form anhydrous copper (ii) sulfate.
• evaporation is a physical change
The final temperature is 28 °C.
There are two heat transfers involved.
heat from combustion of propane + heat gained by water = 0
<em>q</em>_1 + <em>q</em>_2 = 0
<em>q</em>_1+ <em>C</em>_calΔ<em>T</em> = 0
<em>q</em>_1 = -50 kJ
<em>q</em>_2 = 6.00 kJ·°C^(-1) × Δ<em>T</em> = 6.00 Δ<em>T</em> kJ·°C^(-1)
<em>q</em>_1 +<em> q</em>_2 = -50 kJ + 6.00 Δ<em>T</em> kJ·°C^(-1) = 0
Δ<em>T</em> = 50/[6.00 °C^(-1)] = 8.33 °C
<em>T</em>_f = <em>T</em>_i + Δ<em>T</em> = 20 °C + 8.33 °C = 28 °C
The density of pure water is 1 g/cm^3.
Its density is 0.98 g cm 3 at room temperature, in comparison with the handiest zero.92 g cm 3 for ice, a reality that has to be defined through atomic, and molecular concepts. If ice has been no longer much less dense than water, it might sink, having a devastating impact on lake backside ecosystems. believe it or now not, ice is honestly about 9% much less dense than water. for the reason that water is heavier, it displaces the lighter ice, causing the ice to glide to the pinnacle.
The density of ice is about 90 percent that of water, but that could range because ice can contain air, too. meaning that about 10 percent of an ice cube or iceberg will be above the water line. The density of water is maximum at four∘C, and the density of the ice is much less than the water due to its susceptible intermolecular pressure of attraction. as the density of water is more, it's miles heavier than ice. therefore ice floats on the floor of the water. Ice continually floats due to the fact it's far less dense than everyday water. because frozen water molecules shape a crystal.
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Answer:
A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule.
