Question

a. magnesium has a +1 charge and fluorine has a -2 charge
b. magnesium has a +2 charge and fluorine has a -2 charge
c. magnesium has a +2 charge and each fluorine has a -1 charge
d. magnesium has a -2 charge and fluorine has a +1 charge
q13. predict the type of bond in sif₄.
a. ionic, because it contains a metal and a non - metal
b. covalent, because it is made of nonmetals sharing electrons
c. ionic, because fluorine always forms ionic bonds
d. covalent, because silicon gives away electrons
dok 4 - extended thinking
q14. which test could help determine if a white solid is ionic or covalent?
a. heat the solid and see if it melts at a very high temperature
b. test if it dissolves in water and conducts electricity
c. check if it has a shiny metallic luster
d. place it in sunlight and observe color change
q15. why is understanding bonding and naming compounds important in real life?
a. it is only useful for passing science exams
b. it helps in cooking food at correct temperatures
c. it helps in designing medicines and materials with desired properties
d. it has no significant applications outside of school

Explanation:

• Q13: Silicon and fluorine are non - metals. Covalent bonds form when non - metals share electrons. So, $SiF_4$ has covalent bonds.
• Q14: Ionic compounds dissolve in water and conduct electricity due to the presence of ions that can move freely. This is a characteristic test to distinguish ionic from covalent solids.
• Q15: Understanding bonding and naming compounds is crucial for designing medicines and materials with specific properties as different bonds and structures lead to different chemical and physical behaviors.

Answer:

• Q13: B. Covalent, because it is made of nonmetals sharing electrons
• Q14: B. Test if it dissolves in water and conducts electricity
• Q15: C. It helps in designing medicines and materials with desired properties