Chemistry Challenge: Grade 9 Chemistry Trivia
1.
As you move left along the periodic table, what happens to the atomic number of the elements?
Answer:
Decrease
Explanation:
As you move left along the periodic table, the atomic number of elements tends to decrease. This is because elements are arranged in increasing order of atomic number from left to right across periods in the periodic table.
2.
What is an ionic compound the result of?
Answer:
A metal and a nonmetal
Explanation:
An ionic compound forms through the bonding of a metal and a nonmetal. Ionic bonds involve the transfer of electrons from the metal to the nonmetal, resulting in the formation of positively charged cations and negatively charged anions. The electrostatic attraction between these oppositely charged ions forms the ionic compound.
3.
What happens or is likely to happen if the atoms within an element have full valence shells?
Answer:
They are unlikely to bond with other elements.
Explanation:
When the atoms within an element have full valence shells, it means that they have achieved a stable electron configuration. This stability makes it unlikely for these atoms to bond with other elements because they do not need to gain, lose, or share electrons to achieve a more stable configuration.
4.
How many valence electrons does an atom require to have a full shell?
Answer:
8
Explanation:
An atom requires 8 valence electrons to have a full shell. The octet rule states that atoms tend to gain, lose, or share electrons in order to achieve a stable configuration with 8 electrons in their outermost shell, which is the most stable electron configuration. This is known as achieving a full shell or achieving the noble gas configuration.
5.
How many atoms does Hydrogen Peroxide consist of?
Answer:
Two Hydrogen, Two Oxygen
Explanation:
Hydrogen peroxide (H2O2) is a chemical compound composed of two hydrogen (H) atoms and two oxygen (O) atoms. The chemical structure of hydrogen peroxide can be represented as H-O-O-H, illustrating the arrangement of the atoms. The oxygen atoms are connected by a single bond, and each oxygen atom is also bonded to a hydrogen atom. The presence of peroxide linkage (O-O) contributes to the unique properties of hydrogen peroxide, and it is commonly known for its use as a disinfectant and bleach.
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