Which of the following examples depict(s) a physical property?
2 answers:
Answer:
Explanation:
A physical property is a property that can be observed without changing the composition.
Some examples of physical properties are:
- Color
- Density
- Length
- Mass
- Smell
- Temperature
- Boiling Point
- Hardness
Now, let's examine our answer choices.
Choice A: Sugar is white in color
- The property is color, which is a physical property.
Choice B: Iron is more dense than aluminum
- The property is density, which is a physical property.
Choice C: Diamond is harder than graphite.
- The property is hardness, which is a physical property.
Since all three choices depict physical properties, the best choice is D. All of the above.
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Answer : 51.8 g of nitrogen are needed to produce 100 grams of ammonia gas.
Solution : Given,
Mass of = 100 g
Molar mass of = 27 g/mole
Molar mass of = 28 g/mole
First we have to calculate moles of .
The given balanced chemical reaction is,
From the given reaction, we conclude that
2 moles of produced from 1 mole of
3.7 moles of produced from
of
Now we have to calculate the mass of .
Mass of = Moles of
× Molar mass of
Mass of = 1.85 mole × 28 g/mole = 51.8 g
Therefore, 51.8 g of nitrogen are needed to produce 100 grams of ammonia gas.
Answer : The correct option is, (2) Cr (Chromium)
Explanation :
The reactivity series of metal are arranged of the reactivity from the highest to the lowest. Reactivity series is used to determine the products of the single displacement reactions. In the single displacement reaction, the most reactive metal displaces the least reactive metal.
From the given reactivity series we conclude that there are two metal (Mg and Cr) are more reactive metal than the Ni and there are two metal (Pb and Cr) are less reactive metal than the Zn. So, the Cr (Chromium) is the metal which is more active than Ni and less active than Zn.
Hence, the correct option is, (2) Cr
