Question

3 multiple answer 1 point
which of the following are properties of metal? (choose all that apply.)
□ they are non - ductile.
□ they are shiny.
□ they form basic oxides.
□ they conduct electricity.
4 multiple choice 1 point
what is the charge of the cobalt ion in $cocl_2$?
○ - 1
○ + 1
○ - 2
○ + 2

Explanation:

Question 3 (Multiple Answer)

• Metals are generally ductile (so "They are non - ductile" is incorrect).
• Metals have a shiny appearance (lustrous), so "They are shiny" is a property of metals.
• Metals form basic oxides when they react with oxygen, so "They form basic oxides" is correct.
• Metals are good conductors of electricity, so "They conduct electricity" is correct.

Step 1: Recall the charge of chloride ion

Chloride ion ($\text{Cl}^-$) has a charge of - 1.

Step 2: Let the charge of cobalt ion be $x$

In $\text{CoCl}_2$, there is 1 cobalt ion and 2 chloride ions. The compound is neutral, so the sum of charges is zero. We can write the equation: $x+2\times(- 1)=0$

Step 3: Solve for $x$

$x - 2=0$, so $x = + 2$.

Answer:

B. They are shiny, C. They form basic oxides, D. They conduct electricity

Question 4 (Multiple Choice)