Answer:
Option: A and D are the correct answer.
A. 50% and D. 25%
Explanation:
We know that the probability of an event is the chance of occurring of an event.
The probability of an event always lie between 0 and 1.
It is equal to zero if the event will never occur and is equal to 1 if the event is certain to occur.
Also, the probability could be in ratio or it could be in percentage and the percent may be between 0%-100%
Hence, in the given options:
B) 557 is incorrect as the probability is greater than 1.
c) 1×104=104 is incorrect since the probability is greater than 1
Hence, the correct options are:
A. 50%
and D. 25%
Answer:
1. Elements have only 1 type of atoms
2. Atomic Number
3. Atomic Mass
4. Isotopes
5. Allotropes
Explanation:
An element is a pure chemical substance made of same type of atom.
Elements are distinguished by their name, symbol, atomic number, melting point, boiling point, density and ionization energies. In the Periodic Table, elements are arranged according to their atomic number and they are grouped according to similar chemical properties and are depicted by their symbols.
<em>1. Elements have only 1 type of atoms</em>
<em>2. Atomic Number</em>= Number of protons is also indicative of electric charge or number of electrons present in the nucleus which determines chemical properties of the element.
<em>3. Atomic Mass</em>= the atomic mass of the element which is the total number of protons and neutrons in the nucleus of an atom of the element.
<em>4. Isotopes</em>= isotopes of an element have the same number of protons in their nucleus but differ in the number of neutrons. Naturally occurring elements have more than one stable isotope. Thus isotopes have similar chemical properties (due to same number of protons) but different nuclear properties (due to different number of neutrons).
<em>5. Allotropes</em>= atoms of an element can form bonds with each other in more than one way leading to difference in their chemical properties
Answer:
Explanation:
This is called the equivalence point. That is the exact point during titration where the relative amounts of each substance in the chemical reaction of titration become well defined by the coefficients in the balanced chemical equation used for expressing the kinetics of reaction.
A titration is an experimental set up with a controlled acid-base neutralization reaction.it is used to determine the unknown concentration of an acid or a base.
Acids and bases neutralize each other, forming a salt and water. Basically, a strong acid-strong base neutralization gives a neutral solution with a pH of 7.
