CIE iGCSE Co-Ordinated Science P5.1 The nucleus Exam Style Questions Paper 1
Question
The table gives information about four nuclides P, Q, R and S. Which nuclides are isotopes of the same element?
| nuclide | number of protons | number of neutrons |
|---|---|---|
| P | 81 | 123 |
| Q | 82 | 122 |
| R | 82 | 123 |
| S | 83 | 121 |
A) P and Q
B) P and R
C) Q and R
D) Q and S
▶️Answer/Explanation
Answer: C) Q and R
Explanation: Isotopes of the same element have the same number of protons but different numbers of neutrons. Q and R both have 82 protons, making them isotopes of the same element.
Question
An atom of beryllium is represented by 4 9Be.
How many neutrons are in the nucleus of this type of beryllium atom?
A 4 B 5 C 9 D 13
▶️Answer/Explanation
Ans :A
Question
An atom of beryllium is represented by An atom of beryllium is represented by4 9Be.
How many neutrons are in the nucleus of this type of beryllium atom?
A 4 B 5 C 9 D 13
▶️Answer/Explanation
Ans : B
Question
The nucleus of an isotope of gold contains 79 protons and 118 neutrons. The symbol for gold is Au.
What is the nuclide symbol for this isotope?
A \( _{118}^{79}\textrm{Au}\)
B \( _{197}^{79}\textrm{Au}\)
C \( _{79}^{118}\textrm{Au}\)
D \( _{79}^{197}\textrm{Au}\)
▶️Answer/Explanation
Ans : D
Question
A nuclide of hydrogen is represented by $_{1}^{3}\textrm{H}$
Which row shows the number of protons and the number of neutrons in this nuclide?
▶️Answer/Explanation
Ans : A
Question
An atom of an isotope of strontium (Sr) has a proton number of 38 and contains 52 neutrons. What is the nuclide notation for this isotope?
(A) \(_{38}^{52}\textrm{Sr}\) (B) \(_{38}^{90}\textrm{Sr}\) (C) \(_{52}^{38}\textrm{Sr}\) (D) \(_{52}^{90}\textrm{Sr}\)
▶️Answer/Explanation
Ans: B
Question
A scientist places equal volumes of starch and saliva into a test-tube. After 30 minutes, the mixture in the test-tube is tested with iodine solution.
The iodine solution remains brown.
Which process does this experiment demonstrate?
(A) absorption
(B) assimilation
(C) digestion
(D) ingestion
▶️Answer/Explanation
Ans: C
Question
One method of preventing food spoilage is to store it at 4 ºC in a refrigerator.
Why does storing food at low temperatures help to prevent food spoilage?
(A) It decreases enzyme activity.
(B) It denatures enzymes.
(C) It increases enzyme production.
(D) It kills cells.
▶️Answer/Explanation
Ans: A
Question
The table compares an atom of carbon-13 and an atom of nitrogen-14.
What do the neutral atom of carbon-13 and the neutral atom of nitrogen-14 have the same number of?
A. electrons
B. ions
C. neutrons
D. protons
▶️Answer/Explanation
Answer: C
Explanation: Carbon-13 has 6 protons and 7 neutrons, while nitrogen-14 has 7 protons and 7 neutrons. Both atoms have the same number of neutrons (7). Therefore, the correct answer is C.
Question
The diagrams represent the nuclei of four different atoms V, W, X and Y.
Which two diagrams represent isotopes of the same element?
A. V and Y
B. W and X
C. X and Y
D. Y and W
▶️Answer/Explanation
Answer: C. X and Y
Explanation: Isotopes of the same element have the same number of protons but different numbers of neutrons. Diagrams X and Y show nuclei with the same number of protons but different numbers of neutrons, indicating they are isotopes.
Question
What is the proton number (atomic number) of the nuclide 146C?
A 6
B 8
C 14
D 20
▶️Answer/Explanation
Answer: A
Explanation: The proton number (atomic number) of carbon is 6, as indicated by the subscript in the nuclide notation.
Question
An atom of an isotope of strontium (Sr) has a proton number of 38 and contains 52 neutrons. What is the nuclide notation for this isotope?
A. \( _{38}^{52}\textrm{Sr}\)
B. \( _{38}^{90}\textrm{Sr}\)
C. \( _{52}^{38}\textrm{Sr}\)
D. \( _{52}^{90}\textrm{Sr}\)
▶️Answer/Explanation
Answer: B
Explanation: The nuclide notation is written as \( \frac{A}{Z} \) X, where A is the mass number (protons + neutrons) and Z is the proton number. For this isotope, A = 38 + 52 = 90, and Z = 38.
Question
There are three different isotopes of hydrogen.
Which statement about the nuclei of these three isotopes is correct?
A. They have different numbers of electrons.
B. They have the same number of nucleons.
C. They have the same number of neutrons.
D. They have the same number of protons.
▶️Answer/Explanation
Answer: D
Explanation: Isotopes of an element have the same number of protons but different numbers of neutrons. Therefore, the nuclei of the three isotopes of hydrogen have the same number of protons.