Chemistry Challenge: Grade 9 Chemistry Quiz
Can you beat this Grade 9 chemistry test? Atoms are the smallest and main building blocks of ordinary matter, and they join together to form molecules that make the objects around us. In 9th grade chemistry, we got to dive deeper into the makeup and the elements as a whole. Are you ready for that end-year exam? Take the chemistry quiz for grade 9 and review all that you have covered so far. You can also play the quiz with your friend for a fun learning time together. Good Luck with your exams!
Grade 9 Chemistry Questions and Answers
- 1.
Elements consist of a single type of atom.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Elements are substances that cannot be broken down into simpler substances by chemical means. Each element is made up of only one type of atom. For example, oxygen is an element that consists of only oxygen atoms, and gold is an element that consists of only gold atoms.Rate this question:
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- 2.
As you move left along the periodic table, what happens to the atomic number of the elements?
- A.
Increase
- B.
Decrease
- C.
Stay the Same
- D.
Undefined
Correct Answer
B. DecreaseExplanation
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.Rate this question:
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- 3.
Which of the following is NOT an indicator of a Chemical Reaction?
- A.
Change of colour
- B.
Gas/Bubbles form
- C.
It becomes poisonous.
- D.
Creates heat/light
- E.
Scent changes
Correct Answer
C. It becomes poisonous.Explanation
The statement "It becomes poisonous" is not a direct indicator of a chemical reaction. While some chemical reactions can produce toxic substances, the toxicity itself is not an observable indicator. Common indicators of a chemical reaction include a change of color, the formation of gas or bubbles, the creation of heat or light, and a change in scent. These indicators reflect changes in the substance's properties during a reaction.Rate this question:
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- 4.
Which element below is the Bohr-Rutherford diagram above representing?
- A.
Neon
- B.
Magnesium
- C.
Sulfur
- D.
Oxygen
Correct Answer
A. NeonExplanation
In the Bohr-Rutherford arrangement of neon, the atom has a nucleus at its center containing 10 protons. Neon has two electron shells, with the first shell holding 2 electrons and the second holding 8 electrons, achieving a stable and complete octet in the outermost shell. This arrangement makes neon an inert gas, as it satisfies the octet rule and is generally unreactive.Rate this question:
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- 5.
What is an ionic compound the result of?
- A.
Two metals
- B.
Two nonmetals
- C.
A metal and a nonmetal
- D.
Two distinctly similar metals
Correct Answer
C. A metal and a nonmetalExplanation
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.Rate this question:
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- 6.
What happens or is likely to happen if the atoms within an element have full valence shells?
- A.
They are likely to bond with other elements more easily.
- B.
They are unlikely to bond with other elements.
- C.
They will be labeled as "unstable."
- D.
They will explode.
Correct Answer
B. 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.Rate this question:
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- 7.
How many valence electrons does an atom require to have a full shell?
- A.
3
- B.
8
- C.
16
- D.
100
Correct Answer
B. 8Explanation
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.Rate this question:
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- 8.
Beryllium (which has 2 valence electrons) is more likely to bond with which element?
- A.
Sulfur (Valence electrons: 6)
- B.
Neon (Valence electrons: 8)
- C.
Both of them
- D.
None of the above
Correct Answer
A. Sulfur (Valence electrons: 6)Explanation
Beryllium is more likely to bond with sulfur because they have a compatible number of valence electrons. Beryllium has 2 valence electrons, while sulfur has 6 valence electrons. In order to achieve a stable electron configuration, beryllium can donate its 2 valence electrons to sulfur, forming an ionic bond. This allows both atoms to achieve a full outer electron shell. Neon, on the other hand, already has a full outer electron shell with 8 valence electrons, so it is less likely to form a bond with beryllium. Neon is also a noble gas; noble gases usually do not bond with other elements.Rate this question:
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- 9.
How many atoms does Hydrogen Peroxide consist of?
- A.
Four Oxygen, Two Hydrogen
- B.
Two Hydrogen, Two Oxygen
- C.
One Hydrogen, Three Oxygen
- D.
Two Oxygen, One Hydrogen
Correct Answer
B. Two Hydrogen, Two OxygenExplanation
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.Rate this question:
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.gif "Which element below is the Bohr-Rutherford diagram above representing?")
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