Answer:
1.81 x 
molecules H2
Explanation:
Use Avogadro's number:
3 moles H2 x 6.022 x 
molecules= 1.81 x molecules H2
Answer:
Atomic radius
Explanation:
Atomic radius
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
In the Lewis structure, each single bond drawn between elements contain two electrons. The electron dots represent the lone pairs. These are the electrons that take part in the reaction. To obey the octet rule, the oxygen must have eight electrons around it. The hydrogen is exempted from this rule. Therefore, you have to show two electrons.
Answer:
C
Explanation:
The plate 'float' on top of the liquid magma. There are convection currents that circulate through the magma, and the techtonic plates are moved along with the magma.
The correct answers are given below:
1. Salt water is a liquid solution.
A substance is defined as a liquid solution if it is an homogeneous system in which a solute is dissolved in a liquid solvent. For a liquid solution, more than one compound exist in only one phase. Examples of liquid solution are salt dissolved in water and ethanol dissolved in water.
2. Sterling silver is a solid solution.
A solid solution is a solution that contain a minor constituent, which is distributed uniformly within the crystal lattice of the major component. It is a solid state solution of one or more solutes that are dissolved in a solvent. Thus, a mixture of two crystalline solids exist together in a new crystalline solid.
3. Sugar is a compound.
A compound is said to be formed when two or more elements combine together chemically in order to form a new substance. Such a reaction is usually irreversible and a new substance is usually formed. Sugar such as glucose is consider to be a compound because it was formed from the chemical combination of carbon dioxide, water and energy from the sun.
4. Air is a gaseous solution.
A substance is said to be a gaseous solution if two or more gases are mixed together in such a way that they become uniformly mixed up. In this case both the solvent and the solute are gases. Gases can only dissolve in gases if they are mixed under specific conditions. An example of gaseous solution is air, in which oxygen and other gases are dissolved in nitrogen.
5. Gold is an element.
An element refers to a substance that is made from only one type of atom. There are different types of elements in existence and gold is one of them. An element is usually made up of the same number of proton and electron, this makes the element to be neutral. An element will undergo chemical reactions with other element based on its chemical properties.
