Answer:
1.006 * 103
Explanation:
Add the number between 1 and 9 and add a decimal accordingly . so the answer is 1.006 multiplied by 10 raised to power 3
Using AVOs number
moles -> molecules
multiply moles # by AVOs #
15 x (6.022x10^23=
Answer:
The false statement regarding an exothermic reaction is: <em>A.</em><em> the products have a higher enthalpy than reactants</em>
Explanation:
An exothermic reaction is a type of chemical reaction that involves the <u>release of energy from the </u><em><u>system to the surroundings</u></em>. Thus <em>increasing the temperature of the surroundings.</em>
In this reaction, the <em>enthalpy or energy of the reactants is greater than the enthalpy or energy of the products</em>.<em> </em>(
)
<u>As the enthalpy change of a reaction</u>: 
Therefore, the <em>enthalpy change for an exothermic reaction is negative</em> (
)
Answer:
Electron gain enthalpy becomes more and more negative from left to right in a period. As we move across a period from left to right the atomic size decreases and the nuclear charge increases
Answer:
B) The pH of a buffer solution does not change significantly when a small amount of acid is added.
C) The pH of a buffer solution is determined by the ratio of the concentration of acid to the concentration of base.
Explanation:
Buffer solution is useful in maintaining the pH of a solution constant . It is made of a weak acid and its salt or a weak base and its salt . Ph of a buffer is given by the following relation .
pH = pKa + log [ A⁻ ] / [ HA ]
A- is a base and HA is a weak acid .
When we add acid , it reacts with A⁻ or base and gets neutralised .
When we add base , it reacts with acid HA and gets neutralised . In this way it maintains the pH of the solution .
