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Lesson 1: Speed, Uniform Acceleration and Laws of Motion — Lesson quiz

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  • Questions count: 5
  • Passing grade: 60%
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1.
A car starts moving from rest and accelerates uniformly at 3 m/s2 for 5 seconds. What is its final velocity?
75 m/s
8 m/s
15 m/s
1.67 m/s
2.
An ionic bond is formed primarily between:
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
Noble gas atoms at very low temperatures
Positive metal ions immersed in a sea of delocalized electrons
Two non-metal atoms sharing pairs of valence electrons equally
3.
Which of the following compounds exhibits polar covalent bonding due to a significant difference in electronegativity between 0.4 and 1.7?
Water (H₂O)
Chlorine gas (Cl₂)
Sodium chloride (NaCl)
Methane (CH₄)
4.
The nitrogen molecule (N₂) contains a:
Single ionic bond
Coordinate dative bond
Triple covalent bond (one sigma bond and two pi bonds) sharing 3 electron pairs
Double covalent bond
5.
Solid ionic compounds such as crystal NaCl do NOT conduct electricity in the solid state because:
Electrons are moving too rapidly
They decompose in the presence of air
They contain no electrical charges
Their ions are tightly locked in fixed positions within the rigid crystal lattice and cannot move freely
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