Jujuan Kivera Homework Chapter 2 Matter, Chemical Bonding, Water, and pH 1. The

Question

Jujuan Kivera Homework Chapter 2 Matter, Chemical Bonding, Water, and pH 1. The mass number of an atom depends primarily on the number of a. protons and neutrons c, neutrons and electrons b. lons and isotopes d. protons and electrons 2. The atomic number is determined by the a. number of electrons c. number of protons b. protons-electrons 3. The chemical properties of an element are determined by d. number of neutrons a. valence protons c. valence neutrons d. valence electrons b. isotopes 4. In the following equation, name the reactants: NacI->Na +C a. Na b. Cl c. NaCl d. both a and b 5. 6. 7. A type of bond that forms when atoms share pairs of electrons is a. covalent b. Hydorgen c. Vander walls d. ionic A type of bond that forms when one atom gains and one atom looses an electron is called a. covalent b. Hydorgen c. Vander walls d. ionic 8. A covalent bond in which electrons are not shared equally is a. Polar b. normalc. nonpolar d. neutral 9. Water flows freely but does not separate into individual molecules because water is a. cohesive b. hydrophilic c. hydrophobic d. adhesive 10. Compounds that have an affinity for water are said to be a. cohesive b. hydrophilic c. hydrophobic d. adhesive 11. In a frozen pond the most dense water will be found a. at the top b. in the middle c. at the bottom d. water always has the same density 12. Water ability to absorb large amounts of heat is due to its a. surface tension b. adhesive properties c. cohesive properties d. heat capacity 13. A pH of 3 would be considered a. Basic b. Acidic c.neutral 14. _contribute hydrogen ions into a solution a.Acidsb. Bases c.isotopes d. Compounds 15. To maintain a constant pH are used to regulate the Hydrogen ion concentration u , _ a. Acids b. Bases c.isotopes b, Bases d. buffers

Explanation / Answer

1) A

Protons and neutons are considered for mass number as the electrons mass is very small in comparisons with these.

That is why only protons and neutrons mass is considered while calculating mass number.

2)number of protons

Atomic number is the number of protons in nucleus of an atom.

In an neutral atom atomic number is equal to number of electrons.so used in peroidic table.

3) valence electrons

Chemical properties depend on the charge on the atom. Valence electrons determine the charge on atom whether it is anionic(-) or cationic(+).

4)Nacl

In a normal chemical reaction

Reactants -------} products.

Reactansts react to form products.

So the Nacl in the reactants side acts as reactant.

Na and Cl in right side act as products.

5) covalent bond

6)ionic bond

7th number is missing.

8)polar covalent bond

13)acidic

1-7 is acidic 7 is neutral and 7-14 is basic.

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