Answer: D. Calcium and chloride atoms are held together by electrostatic
forces in a regular pattern.
- It is a solid, so the particles are held together in a regular way. Eliminate B and C.
- Also, there are no covalent bonds, so eliminate A.
Answer:
See answer below
Explanation:
This is pretty easy to solve. First you need to understand that an ionic compound is usually formed between a metal and a non metal. This usually happens between elements from group 1 through group 10 or 11 of the periodic table. A covalent compound is always given in non metal elements from the periodic table, and it's usually the elements from group 13 through group 17.
Some compounds there are missing some atoms, but I manage to find this question and saw the atoms missing, so, in my answer you will see the corrected compound. so don't be surprised.
According to what I state above, then the covalent compounds are:
C₆H₅N
PCl₃
C₂H₄O
NH₃
N₂
SO₄²⁻
The ionic compounds are:
CaO
CdBr₂
WO₂
Na₂O
CsF
Hope this helps
The correct statements are as follows:
1. Reactants must collide, with proper orientations, with the energy greater than or equal to the activation energy for a reaction to take place. It is a correct statement, as to undergo a chemical reaction, the atoms should exhibit proper orientations and enough energy to reach the activation energy.
2. Increasing the concentration of a reactant increases the number of collisions, and the reaction goes faster. The mentioned statement is true, as when increasing the concentration of reactants, there should be more reactants. Thus, the collision will be more that makes the reaction to go faster.
3. The energy of a collision between the molecules or atoms must be greater than the activation energy to break the bonds. The given statement is true, as, with the increase in activation energy, the reaction will get slower. Thus, the energy of the reactants is greater in comparison to the activation energy, and then the reaction is faster to break the bond.
4. Decreasing the temperature decreases the kinetic energy of the reactants, and the reaction goes very slowly. The given statement is true, as when the temperature decreases, the kinetic energy that is required to dissociate the bond, also decreases. This undergoes a slow reaction.
There are five Family on the periodic table that are alkali metals , Alkaline earth metals , transition metals , Halogens family and noble gas family.
1) In alkali metals, there are six elements are present and among all the elements Sodium metal should be selected. Because sodium metal is most abundant metal in the world.
- uses of sodium are
- sodium salt are common salt that added to the food to enhance the taste.
- washing soda are made up of sodium salt which is used as water softener.
- sodium salts are also used as buffer to maintain Ph.
2) In alkaline earth metal family, The magnesium element should be selected.
- uses of magnesium are
- since magnesium is a soft metal so it can burn easily therefore it is used in fire works.
- magnesium is also important for proper growth and maintenance of bones.
- Magnesium is light weight metal so it can used to make car seat , luggage and power tools etc.
3) In Halogens gas family , chlorine should be selected.
- Uses of chlorine are
- The chlorine is used in cleaning purpose as it act as bleaching agent.
- Chlorine is also used to prepare the pesticides to removes pest in crops.
- In refrigerators, the cold breeze is coming out is chlorine gas which are used to increase the shelf life of the plants.
4) In transition metals , copper metal should be choose.
- Use of copper metal are
- Copper is highly ductile metal so it drawn into wires and used in various electrical purpose.
- The copper has anti corrosive properties so it can used in making kitchen utensils.
- The copper has anti microbial property so it can used in packaging of food.
5) In noble gas elements, The helium gas should be selected
- uses of helium gas are
- It used as semiconductors.
- It used in party balloons.
- The helium is inert gas so it used to make optical fibers.
These are the daily life usage of all the elements of each family of the periodic table.
Lean more about Periodic Table here
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