Answer:
B. Watermelon
Explanation:
Watermelon is the only option with a definite shape that wouldn't change if you put it in a bowl
Answer:
first balance the reaction
n2 + 3h2 --> 2NH3
then you have your ratios
so for every mole of N2 you get 2 NH3
so 8.4mol is your answer
Explanation:
The answer is: To demonstrate that the liquid is a mixture, the scientist can perform the chromatography.
Mixture: They are formed when two elements or compounds are combined physically and not chemically.
What are the types of mixtures?
- Mixtures are divided into two categories :Homogeneous and heterogeneous.
- Homogeneous mixtures- They have the same composition throughout their mass and there are no visible boundaries between the components of the mixture. Example- Sugar solution, salt solution, alloys, alcohol dissolved in water.
- Heterogeneous mixture- They do not have the same composition throughout there are visible boundaries between the components of the mixture. Example- Milk, sand, and iron fillings, solution of , solution of .
- To demonstrate the the given liquid is a mixture, the scientist can perform Chromatography.
- Chromatography is based on the different rates of adsorption of components of a mixture on a suitable adsorbent.
- When a drop of a mixture of substances is put on a chromatogram paper and the paper is dipped in a solvent, the substance that is more soluble in the solvent rises faster compared to others. And due to this difference in adsorption of different substances, they are separated by the method of chromatography.
- If two spots are seen on a chromatogram that means the liquid is a mixture and if only one spot is visible, that suggests that liquid is a pure liquid.
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Answer:
0.25 mole of NO2 contains 0.25 mole 'N'
one mole contains 6.023 x 10 ^23 atoms
0.25 mole II------------------------------>?
= 0.25 x 6.023 x10^23 = 1.5 x 10^23 atoms
Explanation:
Answer:
Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. Dalton based his theory on the law of conservation of mass and the law of constant composition. ... Parts of the theory had to be modified based on the existence of subatomic particles and isotopes.
Explanation: