Question

name: exit ticket sc.8.p.8.5 which compound is formed when magnesium (mg) from group 2 bonds with oxygen (o) from group 16? a. mgo b. mg₂o c. mgo₂ d. mg₄o which compound is formed when calcium (ca) from group 2 bonds with chlorine (cl) from group 17? a. cacl b. ca₂cl c. cacl₂ d. ca₂cl₂ when conducting an investigation, you heat up a sample of liquid r1. after 5 minutes, you notice that you have formed a gas p1 and a solid p2. based on this information, which substance is most likely to be a compound (made up of 2+ substances). a. r1 b. p1 c. p2 d. none

Explanation:

Step1: Determine Mg - O compound

Magnesium (Mg) in Group 2 has a +2 charge ($Mg^{2 +}$), oxygen (O) in Group 16 has a - 2 charge ($O^{2-}$). The compound formed is MgO as the charges balance out ($1\times(+2)+1\times(-2)=0$).

Step2: Determine Ca - Cl compound

Calcium (Ca) in Group 2 has a +2 charge ($Ca^{2+}$), chlorine (Cl) in Group 17 has a - 1 charge ($Cl^{-}$). To balance the charges, 2 chlorine atoms are needed for 1 calcium atom, so the compound is $CaCl_{2}$ ($1\times(+2)+2\times(-1)=0$).

Step3: Analyze compound in heating process

A compound can be decomposed into different substances by heating. Since heating liquid R1 gives a gas P1 and a solid P2, R1 is most likely a compound.

Answer:

1. A. MgO
2. C. $CaCl_{2}$
3. A. R1