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FREE AND STUDY GAMES ABOUT CHEMISTRY CHAPTER 4
EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -29 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: When there is a positive symbol (+) in notation, that means that the element is ____ an electron.
Answer:
Losing Question 2: Beta decay:
Answer:
-The emission of a beta particle (an electron) -0 over -1 e
Question 3: A positively charged atom is called a _____.
Answer:
Cation
Question 4: What is mass number?
Answer:
Mass number = protons + neutrons
Question 5: JJ Thomson's ____ ____ experiment showed that there were _____ particles.
Answer:
Cathode ray; subatomic
Question 6: The number of protons is also the _____ _____.
Answer:
Atomic number
Question 7: 1 AMU =
Answer:
1/12th the mass of a Carbon-12 atom Question 8: Isotopes have the same number of ____, but a different number of ____.
Answer:
Protons; neutrons. If isotopes had a different number of protons, they would be a different element entirely.
Question 9: A negatively charged atom is called a ______.
Answer:
Anion
Question 10: Why aren't the mass numbers on the periodic table whole numbers?
Answer:
Because the average atomic mass is a weighted average of all the different isotopes of an element.Question 11: 2. Most particles went ____ the foil because the atom was mostly ____ space, but some ____.
Answer:
Through; empty; deflected Question 12: Conclusions from Dalton's work: atoms react in ___ ____; mass is ____ in chemical reactions
Answer:
Fixed ratios; conserved
Question 13: 3. Deflection was caused because some particles hit the _____.
Answer:
Nucleus
Question 14: Loss of electrons makes the atom more ____ charged.
Answer:
Positively
Question 15: What is radioactivity?
Answer:
Particles and rays (that alter an atom's identity) are emitted by unstable atoms Question 16: The mass number is equal to the number of ____ plus the number of ____ combined.
Answer:
Protons; neutrons
Question 17: Isotopes are basically...
Answer:
Different versions of the same atom
Question 18: What is atomic number?
Answer:
Atomic number = the number of protons. The atomic number is equal to the number of protons/electrons in atoms.Question 19: 5. Concluded that atoms have a ____ packed center surrounded by _____, and that most of the atom is _____ space
Answer:
Densely; electrons; empty
Question 20: Gaining of electrons makes the atom more ____ charged.
Answer:
Nnegatively
Question 21: 4. Rutherford is credited to the _____ of the _____.
Answer:
Discovery; nucleus Question 22: Alpha decay:
Answer:
-The emission of an alpha particle (He atoms)
- 4 over 2 He
-Process continues until atom reaches stability
Question 23: 1. Shot alpha particles (____ atoms) at gold foil screen.
Answer:
Helium
Question 24: Electrons
Answer:
-Around the nucleus -Negative charge (1-) -Relative mass = 1/1840
Question 25: Which has a charge? Atoms or ions?
Answer:
Ions have a charge. Atoms are always neutral because they have an equal number of protons and electrons.
Question 26: Neutrons
Answer:
-In the nucleus -Neutral charge (0) -Relative mass = 1
Question 27: What makes an atom stable?
Answer:
-The ratio of protons to neutrons -Once stability is reached, the atom stops decaying
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