Chemistry Review Grade 9 Science
.webp "Chemistry Review Grade 9 Science - Quiz")
Review of subatomic particle and ion and isotopes families and density
Questions and Answers
- 1.
this subatomic particle has a positive charge
- A.
Proton
- B.
Neutron
- C.
Electron
- D.
Andreon
- E.
Vladon
Correct Answer
A. ProtonExplanation
A proton is a subatomic particle that carries a positive charge. It is found in the nucleus of an atom along with neutrons. Electrons, on the other hand, carry a negative charge and orbit around the nucleus. Therefore, the correct answer is proton.Rate this question:
-
- 2.
This subatomic particle has the smallest mass
- A.
Proton
- B.
Neutron
- C.
Electron
- D.
Emitron
- E.
Stefatron
Correct Answer
C. ElectronExplanation
The electron has the smallest mass compared to the other subatomic particles listed. Protons and neutrons have approximately the same mass, which is much larger than that of an electron. Emitron and stefatron are not recognized subatomic particles, so they can be ruled out as options. Therefore, the electron is the correct answer as it has the smallest mass.Rate this question:
-
- 3.
This subatomic particle has a neutral charge
- A.
Proton
- B.
Neutron
- C.
Electron
- D.
Madetron
- E.
Maron
Correct Answer
B. NeutronExplanation
Neutrons are subatomic particles that have a neutral charge, meaning they do not have a positive or negative charge. Protons have a positive charge, electrons have a negative charge, and madetron and maron are not known subatomic particles. Therefore, the correct answer is neutron.Rate this question:
-
- 4.
This subatomic particle has a negative charge
- A.
Jakotron
- B.
Dilisitron
- C.
Proton
- D.
Neutron
- E.
Electron
Correct Answer
E. ElectronExplanation
The electron is a subatomic particle that carries a negative charge. It is one of the fundamental particles that make up atoms. Electrons are found in the electron cloud surrounding the nucleus of an atom and are responsible for the chemical behavior of elements. They play a crucial role in various phenomena such as electricity, magnetism, and chemical reactions.Rate this question:
-
- 5.
A charged atom is called
- A.
A yron
- B.
An ion
- C.
A chargon
- D.
An isotope
- E.
A lucon
Correct Answer
B. An ionExplanation
An ion is a charged atom because it has gained or lost one or more electrons, resulting in an imbalance between the number of protons and electrons. This imbalance creates a positive or negative charge, making the atom an ion.Rate this question:
-
- 6.
How many neutrons does carbon-14 have?
- A.
6
- B.
7
- C.
8
- D.
14
- E.
0
Correct Answer
C. 8Explanation
Carbon-14 is an isotope of carbon, meaning it has the same number of protons but a different number of neutrons. The atomic number of carbon is 6, which represents the number of protons in its nucleus. Since the question asks about the number of neutrons in carbon-14, which has an atomic number of 6, we subtract 6 from the atomic mass of carbon-14, which is 14. This gives us 8, indicating that carbon-14 has 8 neutrons.Rate this question:
-
- 7.
How many neutrons does He-3 have?
- A.
1
- B.
2
- C.
3
- D.
4
- E.
0
Correct Answer
A. 1Explanation
He-3 is an isotope of helium, which means it has the same number of protons as regular helium but a different number of neutrons. The atomic number of helium is 2, which means it has 2 protons. Since He-3 has 1 neutron, the total number of neutrons in He-3 is 1.Rate this question:
-
- 8.
How many protons does C-13 have?
- A.
13
- B.
6
- C.
7
- D.
8
- E.
0
Correct Answer
B. 6Explanation
C-13 is the isotope of carbon with a mass number of 13, which indicates the total number of protons and neutrons in the nucleus. Since the atomic number of carbon is 6, it means that C-13 has 6 protons.Rate this question:
-
- 9.
What charge do lithium ions have?
- A.
1-
- B.
1+
- C.
2-
- D.
2+
- E.
0
Correct Answer
B. 1+Explanation
Lithium ions have a positive charge of 1+. This means that they have lost one electron, resulting in a net positive charge. The positive charge is indicated by the "+" symbol.Rate this question:
-
- 10.
What charge do oxygen ions have?
- A.
1+
- B.
1-
- C.
2+
- D.
2-
- E.
8+
Correct Answer
D. 2-Explanation
Oxygen ions have a charge of 2- because oxygen typically has 6 valence electrons and it gains 2 electrons to achieve a stable octet configuration. This results in a net charge of -2.Rate this question:
-
- 11.
Why do atoms form ions
- A.
To attract other ions
- B.
To get charged
- C.
To have a full (stable) outer shell
- D.
To form attractions
- E.
Nobody knows
Correct Answer
C. To have a full (stable) outer shellExplanation
Atoms form ions in order to have a full and stable outer shell. A full outer shell is achieved by either gaining or losing electrons. By forming ions, atoms can either gain or lose electrons to achieve a stable electron configuration, similar to that of a noble gas. This stability is important as it allows atoms to become more chemically stable and less reactive, making them more likely to form attractions with other ions and create compounds.Rate this question:
-
- 12.
How many electrons are there on the outer shell of a neutral potassium atom
- A.
1
- B.
2
- C.
7
- D.
19
- E.
39
Correct Answer
A. 1Explanation
The outer shell of an atom is also known as the valence shell, which determines the chemical properties of the element. In the case of a neutral potassium atom, the atomic number is 19, indicating that it has 19 electrons. The electron configuration of potassium is 2-8-8-1, meaning that there is only 1 electron on the outer shell. Therefore, the correct answer is 1.Rate this question:
-
- 13.
The atomic number is always the same as the number of
- A.
Protons +neutrons
- B.
Protons
- C.
Neutrons
- D.
Electrons
- E.
Joeyons
Correct Answer
B. ProtonsExplanation
The atomic number of an element represents the number of protons in the nucleus of an atom. Protons are positively charged particles, and their number determines the element's identity. Neutrons, on the other hand, are neutral particles found in the nucleus, and their number can vary, resulting in different isotopes of an element. Electrons, which are negatively charged particles, orbit the nucleus and their number can also vary, resulting in ions. However, the atomic number specifically refers to the number of protons, making "protons" the correct answer.Rate this question:
-
- 14.
The atomic mass is the same as the number of
- A.
Protons + neutrons
- B.
Protons
- C.
Neutrons
- D.
Electrons
- E.
Evans
Correct Answer
A. Protons + neutronsExplanation
The atomic mass of an atom is determined by the sum of its protons and neutrons. Protons carry a positive charge and are located in the nucleus of an atom, while neutrons have no charge and are also found in the nucleus. Electrons, on the other hand, have a negative charge and orbit around the nucleus. Since the question asks for the correct answer, it is clear that the atomic mass is equal to the sum of protons and neutrons, as electrons do not contribute significantly to the overall mass of an atom.Rate this question:
-
- 15.
This family of gases does not react.
Correct Answer
noble gasesExplanation
Noble gases are a group of chemical elements with very low reactivity due to their complete valence electron shells. This group includes helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Because their outermost electron shell is full, they do not tend to form chemical bonds with other elements.Rate this question:
- 16.
As you move from left to right in a period the atomic radius
Correct Answer
decreasesExplanation
As you move from left to right in a period, the atomic radius decreases. This is because the number of protons in the nucleus increases, resulting in a stronger attractive force on the electrons. As a result, the electrons are pulled closer to the nucleus, causing the atomic radius to decrease. Additionally, the increase in the number of electrons in the same energy level also contributes to the decrease in atomic radius.Rate this question:
- 17.
As you move down the halogens, the reactivity
Correct Answer
decreasesExplanation
As you move down the halogens group on the periodic table, the reactivity decreases. This is because the atomic size increases down the group, leading to a weaker attraction between the outermost electron and the nucleus. As a result, it becomes easier for the halogens to gain an electron and form a stable negative ion. Therefore, the ability of halogens to undergo chemical reactions and form compounds decreases as you move down the group, indicating a decrease in reactivity.Rate this question:
- 18.
An object with a greater density than the liquid it is placed in will
Correct Answer
sinkExplanation
An object with a greater density than the liquid it is placed in will sink because density is a measure of how much mass is contained in a given volume. If the object has a greater density than the liquid, it means that it has more mass packed into a smaller volume compared to the liquid. This causes the object to be heavier than the liquid and therefore it sinks.Rate this question:
- 19.
As you go down a column in the periodic table, the number of shells
Correct Answer
increasesExplanation
As you move down a column in the periodic table, the number of shells increases. Each row in the periodic table represents a new energy level or shell. As you move from the top to the bottom of a column, the electrons occupy higher energy levels and therefore more shells. This is because the atomic radius increases down a group, allowing for more space for additional electron shells. Therefore, the number of shells increases as you go down a column in the periodic table.Rate this question:
- 20.
Which type of chemical bond involves the sharing of electrons between atoms?
- A.
Ionic
- B.
Covalent
- C.
Metallic
- D.
Hydrogen
Correct Answer
B. CovalentExplanation
Covalent bonds form when atoms share electrons to achieve a stable electron configuration. This is common in molecules like H2O (water).Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Jun 12, 2024Quiz Edited by
ProProfs Editorial Team -
Oct 08, 2009Quiz Created by
Kauffmg
Back to top