The circle on the left shows a magnified view of a very small portion of liquid

Question

The circle on the left shows a magnified view of a very small portion of liquid water in a closed container. What would the magnified view show after the water evaporates? Water O oxygen Hydrogen OTO Evaporated water Liquid Water (a) (c) (e) True or False? When a match burns, some matter is destroyed. O True False What is the reason for your answer to the previous question? O This chemical reaction destroys matter. O Matter is consumed by the flame. O The mass of ash is less than the match it came from O The atoms are not destroyed, they are only rearranged. O The match weighs less after burning. Heat is given off when hydrogen burns in air according to the equation 2H2+O2 2H2O Which of the following is responsible for the heat? O Breaking hydrogen bonds gives off energy O Breaking oxygen bonds gives off energy. O Forming hydrogen-oxygen bonds gives off energy. O Both (a) and (b) are responsible O (a), (b), and (c) are responsible Two ice cubes are floating in water: Water

Explanation / Answer

For first problem of the closed container, the appropiate answer will be e), as the water molecules only will separate from each other causing evaporation. IF the container did not contain vacuum and contained some oxygen or hydrogen, answer will be letter b), which is not this case.

For second question, the answer is false, as matter is never destroyed or created, only transformed. And the reasoning, which is the next question, is as mentioned, atoms are not created nor destroyed, only rearranged.

For the hydrogen combustion question, the correct answer is due to the formation of hydrogen-oxygen bonds. Generally, the formation of bonds releases heat, while the breaking down of bonds requires energy otherwise.

For next question, when ice melts level of the water on the glass will rise up, and this is due to molecules of water occupy a greater volume on the liquid form than on the compact solid form.

For the solid iodine question, the correct answer will be the same 27 grams, as the same quantity of iodine is present at the end state compared to the initial state, which solves the next question "mass is conserved"

And lastly, the correct answer for the carbon atoms is 30,000,000, as diameter of a carbon atom is 1.5 x 10-10 m, and it is the only answer that fits. 4 and 200 are out of the question, and last option is avogadro's number, which is the number of units (Atoms, electrons...) in a mole.

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