Types of bonds 1
Metallic bonding can be formed between:
Two metallic elements
Mention the groups of the periodic table that can form anions.
15, 16 and 17.
Mention the groups in the periodic table that can form cations
1, 2 and 13
Mention all types of biomolecules
carbohydrates, proteins, lipids and nucleic acids
(1+2+3+4+5+6+7+8+9) / 2.5
22
Mention a difference between metallic and ionic bonding
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Why are valence electrons loose in metals?
True or false: In ionic compounds the interactions of the ions occur only ion to ion.
Flase, the ionic compound are formed by layers of ions interacting with multiple ions.
Nucleic acids are classified in
What type of elements are involved in the formation of an ionic bond.
One metallic element and one non metallic.
In ionic bonding the element with __________ electronegativity will attract to the element with __________ electronegativity
Higher/ Lower
What is the electronegativity difference for metallic compounds?
There is no specific value, it depends on the type of elements (metallic)
For the compound Potasium Iodide (KI), which element would give its valence electrons to the other element?
K because it is in the first column of the periodic table, so it means that it has 1 valence electron, it is a metal, it has low electronegativity.
Lipids are formed by
fatty acids
What month of the year has 28 days?
All of them
If the electronegativity difference between two elements is 1.9, what type of bond does it have?
Ionic bond
In the compound NaCl (Sodium Chloride), which one will give and which one will accept valence electrons and why?
Na will give valence electrons, Cl will accept valence electrons. It is because Chlorine has more valence electrons than Na, it makes Chlorine more electronegative than Na.
Why do ionic compounds conduct electricity in aqueous solutions? (for example, electrolit)
Because when disolved, the ionic compounds are separated into positive and negative ions. It allows the solution to behave as a battery.
Carbohydrates are made of these three elements:
Carbon, hydrogen and Oxygen
When force is applyed to a salt it breaks because:
The layers of ions are displaced, it means that ions of the same charge are going to repel each other. It will allow the separation.
Using the free electron model explin, why metals can conduct electricicty?
Because metals tend to lose valence electrons, them tend to surround metallic atoms and those valence electrons can flow through the metal.
What physical property do ionically bonded compounds and polar covalents have in common?
They are soluble in water.
What is the free electron model?
Is a model that explains the physical properties of metals. It also explains that metalic elements tend to lose valence electrons to complete their aoutermost shell.
How many aminoacids exist? How many are essential? and one function of proteins
20 AMINOACIDS, 9 ESSENTIALS AND 11 NON-ESSENTIALS. They can form tissues, repair cells, form structures, hormonal function...
What gets bigger when more is taken away?
A hole