Question

1. Metals form a) covalent bonds b) ionic bonds c) metalic bonds d) all of the above 2. If a Ca atom looses two electrons it will become a) negatively charged ion b) positively charged ion 3. Chemical formula of sea salt is NaCl. The type of bond form between Na and Cl atoms is a) covalent b) ionic c) metalic d) Van der Walls 4. In covalent bonds, atoms share “missing” electrons a) true b) false 5. Valence electrons are electrons in an outer shell. How many valence electrons C atoms has? a) 2 b) 4 c) 6 d) 8 6. How many multiple covalent bonds C atom can make with an another atom a) 1 b) 2 c) 3 d) 4 7. Pepsi soda is heterogeneous mixture a) true b) false 8. Calcium ions carry a “+2” charge, while chloride ions carry a “-1” charge. What is the chemical formula for the calcium-chloride compound? a) CaCl b) Ca2Cl-1 c) CaCl2 d) Ca2Cl

Answer 1

1. Metals form a) covalent bonds b) ionic bonds c) metalic bonds d) all of the above
Answer: (c)metalic bond

2. If a Ca atom looses two electrons it will become a) negatively charged ion b) positively charged ion
Answer: (b)positively charged ion
Explaination:It loose two negative electron charges and became positively charged

3. Chemical formula of sea salt is NaCl. The type of bond form between Na and Cl atoms is a) covalent b) ionic c) metalic d) Van der Walls
Answer: (b)ionic

4. In covalent bonds, atoms share “missing” electrons a) true b) false
Answer: (a)true

5. Valence electrons are electrons in an outer shell. How many valence electrons C atoms has? a) 2 b) 4 c) 6 d) 8
Answer: (b)4
Explaination:Atomic number of Carban(C) is 6 its inner shell contain 2 electrons and outer contain 4 electrons

6. How many multiple covalent bonds C atom can make with an another atom a) 1 b) 2 c) 3 d) 4
Answer: (d)4
Explaination: Carban atom has 4 electrons in outer shell so it can share these 4 atoms to form 4 covalent bond

7. Pepsi soda is heterogeneous mixture a) true b) false
Answer: both answers are posible
Explaination:an unopened soda in a bottle has a uniform composition and is a homogeneous mixture. Once you open the bottle, bubbles appear in the liquid.

The bubbles from carbonation are gasses, while the majority of the soda is liquid. An opened can of soda is an example of a heterogeneous mixture.

8. Calcium ions carry a “+2” charge, while chloride ions carry a “-1” charge. What is the chemical formula for the calcium-chloride compound? a) CaCl b) Ca2Cl-1 c) CaCl2 d) Ca2Cl
Answer: (c)Cacl2