450
Explanation:
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Answer:
9 duh
Explanation:
Niels Bohr
Ernest Rutherford
John Dlaton
Neil Bohr is the scientist who invented a model of the atom that most closely resembles the modern electron cloud model.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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2) malleability and thermal conductivity
3) density and specific heat capacity
4) hardness and boiling point
Chromatography is an important analytical technique used to separate individual components from a mixture using their polarity difference. Thus option 1 is correct.
Chromatographic technique is used to separate components from a mixture using their polarity and solubility in a solvent. There are different kinds of chromatographic techniques such as paper chromatography, column chromatography, ion-exchange chromatography etc.
All the chromatographic techniques uses the common principle that is the differential distribution of components between mobile phase and stationary phase.
A mobile phase is the movable side in the chromatographic column which brings the solutes to the bottom of the column . Stationary column is stationary and thus the solutes which are more adoured to the stationary side will elute last.
The attachment of solutes to the mobile phase or stationary phase is dependant upon their polarity and solubility in the solvent used. Thus, option 1 is correct.
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Answer:
Option-1 (Solubility and Molecular polarity) is the correct answer.
Explanation:
Thin Layer Chromatography is employed to separate a mixture of non volatile compounds. In this technique an adsorbent material like silica gel is coated on a plastic, glass or aluminium sheet. Then the mixture of compounds is applied at the bottom of sheet and the sheet is placed in the container containing a solvent system. It is observed that the solvent starts travelling upward through capillary action.
While the solvent is running the mixture of compounds starts separating from each other. This separation is due to following physical properties.
1) Solubility of Mixture in Solvent:
In a mixture those compounds which has more solubility in solvent will travel more and will give greater Rf value and the less soluble will left behind with smaller Rf value. Hence due to solubility a mixture of compounds can be separated.
2) Polarity of Molecules:
As the stationary phase (adsorbent material) is polar in nature, so in mixture those compounds which are less polar will less interact with the stationary phase and will travel more with greater Rf value, while, more polar molecules will form stronger interactions with the stationary phase, hence will travel less and therefore, will show smaller Rf values.
b. using pure water
c. blowing on the hot water
d. putting the powder and hot water in a mixer
A , i think because pure water won't dissolve the powder fast.
Answer:
The answer is
Explanation:
The density of a substance can be found by using the formula
From the question
mass of liquid = 2.6 g
volume = 30 mL
The density is
We have the final answer as
Hope this helps you
Answer:
Oganesson is the number 118 the largest