Which kind of bond forms: ionic, covalent or metallic
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
In MgO, oxygen's electronegativity is 3.44 and magnesium's is 1.31. Using (1 − e^(−d²/4)) × 100, what is the bond's percent ionic character, to 0.01%, Ari?
In CaCl₂, chlorine's electronegativity is 3.16 and calcium's is 1. Using (1 − e^(−d²/4)) × 100, what is the bond's percent ionic character, to 0.01%, Bo?
Why does table salt melt only at a very high temperature, Jun?
- Strong attractions between ions
- Weak forces between separate molecules
- A sea of free electrons
Why does salt water conduct electricity when solid salt doesn't, Kira?
- Water makes new electrons
- Salt becomes a metal
- Its ions are free to move
Why is CO₂ a gas at room temperature while NaCl is a solid, Luz?
- CO₂ has a sea of electrons
- CO₂ is separate molecules
- CO₂ is made of ions
Milo says NaCl is held together by shared electron pairs. Agree or disagree?
- Agree: Na and Cl share one pair of electrons
- Agree: bonds are shared pairs
- Disagree: an electron moves to make ions
Noah says water's O–H bonds are ionic because oxygen pulls hard. Agree or disagree?
- Agree: water is a salt
- Agree: oxygen takes the electrons fully
- Disagree: they share pairs unequally
Why is 1.7 called a rule of thumb, Ren?
- Bond type changes gradually
- Metals alone reach 1.7
- It is an exact law
Al₂O₃'s difference is 1.83, just above 1.7. How is it best described, Tala?
- Metallic
- Ionic, with some covalent character
- Purely covalent
Which bond is more ionic, Na–Cl (2.23) or Al–O (1.83), Zee?
- Al–O
- They are equal
- Na–Cl