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sashaice [31]
3 years ago
12

A puddle of water on a sidewalk evaporated. Which statement could

Chemistry
1 answer:
Vadim26 [7]3 years ago
7 0

Answer:

The sun heated the water which changed from a liquid to a gas

Explanation:

The temperature of the atmosphere caused by the sun's heat is enough to react water's boiling point and become a vapor

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What is the density of object A? Does it sink<br> or float in water?
Oksana_A [137]

Answer:

~1.5 g/cm3 and it does NOT float in water.

Explanation:

If you look at the graph, Object A weighs ~6 grams and is ~4 cm3 in volume

Density = Mass/Volume

So 6 grams/4 cm3 = 1.5 g/cm3

Water has a density of 1 g/cm3 and because Object A density is higher than that of water, it sinks.

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3 0
3 years ago
Could someone explain what oxidation numbers are and what these questions are asking of me?
Oxana [17]

The oxidation state, sometimes referred to as oxidation number, describes the degree of oxidation of an atom in a chemical compound.

<u>Explanation:</u>

The oxidation number of an atom is the charge that atom would have if the compound was composed of ions. 1. The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. The oxidation number of simple ions is equal to the charge on the ion.

The oxidation number of a mono atomic ion equals the charge of the ion. The oxidation number of H is +1, but it is -1 in when combined with less electro negative elements. The oxidation number of O in compounds is usually -2, but it is -1 in peroxides. The oxidation number of a Group 1 element in a compound is +1.

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Which of the following is the best example of heat transfer by convection
Ugo [173]
B seems like the correct answer stay safe!
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Energy levels tell us how many <u>electrons </u>there are in an atom. ​

Hope this helps!

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