The correct option is this: TOTAL REJECTION OF THE EARLY VERSIONS FOR MODERN IDEAS.
The modern periodic table arrangement was as a result of many contributions from many scientists, who contributed individual knowledge. The periodic table has gone through a lot of reexamination and it is always regularly updated as new scientific facts emerge. The elements in the periodic table are arranged based on the periodic occurrence of the chemical and physical properties of the elements.
Answer:
Calcium carbonate is another example of a compound with both ionic and covalent bonds.
Explanation:
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
By calculating the answer
Answer:
7.01 is the answer of the [H+] of a solution with a pH of 4.78
Answer:
by providing an alternative pathway with a lower activation energy
Explanation:
Cataysts are the substances that neither consumed nor produced during a chemical reaction, but increase the rate of the reaction.
So, catalysts remain chemically unchnaged after the completion of the reaction.
For a reaction to occur, reactants molecule must collide and successful collisions lead to product formation.
A certain minimum amount of energy is required for successful collision. This minimum amounr of energy is called activation energy.
One way to increase speed of reaction is to provide energy to the reactants and other way to increase speed is to provide alternate pathway with lower activation energy.
Catalyst increases a rate of reaction by providing an alternate pathway with lower activation energy.
Therefore, the correct option is option b 'by providing an alternative pathway with a lower activation energy'
