41⟩ What are 3 facts on evaporation?
1. 80% of evaporation comes from the ocean.
2. 20% of evaporation comes from inland water.
3. Wind helps evaporation by moving it
Chemistry
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176 Chemistry Questions And Answers
42⟩ What is some importance of organic chemistry?
In organic chemistry one uses it both medicinally one uses it to test for illness way back from ancient times. It is also a good diagnostic tool by smell feel or touch. You can actually heed the smell of decay in organic chemistry
43⟩ How do you separate the colors of ink?
The colors of ink can be separated by chromatography.
44⟩ Which is polar HCl or HF?
This question is quite simple if you have an electro negativity chart:
Florine's Electronegativity: 4.0
Chlorine's Electronegativity: 3.0
Hydrogen's Electronegativity: 2.1
HCl: 3.0-2.1= .9 (Slightly polar)
HF: 4.0-2.1= 1.9 (Much more polar)
45⟩ How does spontaneous combustion occur?
It is caused by a build up of sulfur in a person's body that eventually reacts to increased body heat.
46⟩ Explain the method for the preparation of 1 normal solution of hydrochloric acid.
Dilute 85ml of HCL to 1000ml
47⟩ What is the use of glacial acetic acid?
There are no medical uses to pure GAA, dilute concentrations can be used to remove warts or verucas; it can also be used via iontophoresis to treat bone spurs. Industrial uses include photography and the manufacturing of aspirin.
48⟩ Can you show you the organic structure of cetearyl alcohol and tell me what organic family it is?
Cetearyl alcohol is actually a mixture of both stearyl alcohol and cetyl alcohol (refer to links below for structures). Both of these compounds would be considered "fatty alcohols" due to their long carbon chains. Fatty alcohols are in the aliphatic hydrocarbon family. To draw the structure of "cetearyl alcohol" you would actually have to draw the structure of cetyl alcohol and the structure of stearyl alcohol.
49⟩ What element was used to make the first atomic bomb?
Uranium was used in the Hiroshima bomb and Plutonium in the Nagasaki one.
50⟩ How do you convert oxygen gas to liquid oxygen?
Condense in a temperature less than -186 c ideally with liquid helium or other cryogenic means.
51⟩ What is the atomic number and what does it tell you about the number of protons in an atom?
The number of protons in an atom is the atomic number. The number of protons is equal to the atomic number of an atom. It is very important in knowing the number of electrons that surround the nucleus of an atom. In an atom, the electrical charge is neutral, due to the equal number of positive (protons) and negative (electrons) charges. The atomic number represents the protons in an atom and identifies the element. Hydrogen has one proton. No other atom has just one proton. Helium has two protons and no other element has only two protons. Lithium has three protons and so on.
The atomic number is equal to the number of protons in the nucleus, and for neutral atoms, it is the same as the number of electrons.
52⟩ How many valence electrons does each of the elements in the periodic table have?
This all depends on the element's atomic number (number of protons). Since atoms have the same number of protons as they do electrons, the atomic number is essentially equal to the number of electrons as well.
For example, Aluminum atomic number of 13 in the first electron cloud it will only have 2 so then it will have 8 in the other layers until there are not enough electrons. So the first will have 2 electrons, the second layer will have 8 electrons and the last layer will have 3 electrons because there are not enough electrons to make another full layer of 8 electrons. Therefore, Aluminum has 3 valence electrons.
53⟩ Why are elements arranged as they are in the periodic table?
Elements in the periodic table are arranged in order of increasing atomic number (which is just the number of protons found in the nucleus of that element). Starting with hydrogen (H) with only 1 proton and reading left to right and then down, the atomic number goes up one for each element until you reach the highest atomic number of 106.
The reason the periodic table is the shape that it is has to do with the electronic configurations of the elements. The periodic table is arranged so that all the elements in each period (row) have similar electronic configurations to the other elements in that period. That also often means that elements in the same group (column) show similar chemical reactivity. Electrons in atoms are arranged in different orbitals (named "s", "p", "d", and “f").
Elements in the same group all have the same number of electrons in each orbital. For instance, the alkali metals in the first column (Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium) all have 1 electron in their outermost shell/layer (it turns out there are many shell, each one bigger than the previous one -- Lithium has 2 shells while bigger atoms like Caesium have 6 shells). What matters is that they all have a single electron in that outermost shell regardless of how many shells they have in total. This same trend is observed in each group of the table, excluding most of the transition metals.
54⟩ What is the chemical formula for Epsom salts?
Epsom Salt chemical formula is Me245-H2O.
55⟩ Are the chemical properties of lithium a metal metalloid or a nonmetal?
Lithium, Li, is a metal. However, can also be a metalloid or a nonmetal.
56⟩ Is benzene an element or a compound?
Benzene is a compound.
57⟩ What is the full form of hcl?
The full form of HCL is hydrochloric acid or hydrogen chloride gas
58⟩ What is the difference in the modern periodic table and Mendeleevs table?
The periodic table is now arranged in the order of increasing atomic numbers. In addition, it is said that the modern table makes it easier to read and learn. The way that it is set up now allows scientists to make changes if necessary. Hope this helps
59⟩ What is the direction of the dipole moment expected for carbon tetrachloride?
It has no net dipole moment. Hence, it is non-polar.
60⟩ Is HCl polar or non-polar?
Yes, HCl is a polar compound because chlorine is more electronegative than H It attract the bond pair towards itself. Hence, compound is a polar.
