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

Question

uiuon 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 umber of protons b. protons-electrons number of neutrons 3. The chemical properties of an element are determined by a. valence protons c. valence neutrons b. isotopes 4. In the following equation, name the reactants: Naci -> Na+C valence electrons a. Na b. Cl c. NaCl d. both a and b 5. A type of bond that forms when atoms share pairs of electrons is a. covalent b. Hydorgen c. Vander walls 6. d. ionic A type of bond that forms when one atom gains and one atom looses an electron is called 7. a. covalent b. Hydorgen c. Vander walls 8. A covalent bond in which electrons are not shared equally 9. 10. Compounds that have an affinity for water are said to be 11. In a frozen pond the most dense water will be found a Polar b. normal c.nonpolar d. neutral Water flows freely but does not separate into individual molecules because water is a. cohesive b. hydrophilic c. hydrophobic d. adhesive a. cohesive b. hydrophilic c. hydrophobic d. adhesive at the top in the middle c. at the bottom d. water always has the same density a. b. 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 14. contribute hydrogen ions into a solution 15. To maintain a consta a. Basic b Acidic c.neutral a. Acids b. Bases c. isotopes a. Acids b. Bases c.isotopes d. Compounds nt pH are used to regulate the Hydrogen ion concentration d,buffers

Explanation / Answer

Question 1)

Answer: option A

Reason: mass number=number of protons +number of Neutrons

Question 2)

Answer: option C

Reason: because the atomic number is given by the protons present in the nucleus

Question 3)

Answer: option D

Reason: elements in a periodic table with similar chemical properties have the same number of valence electrons,

Question 4)

Answer: option C

Reason: indicated by the arrow in the given reaction.

Question 5)

Answer: option A

Reason: because it is a chemical bond that involves the sharing of electron pairs between atoms.

Question 6)

Answer: option D

Reason: because it is the complete transfer of valence electron(s) between atoms.

Question 8)

Answer: option A

Reason: a polar bond is the kind of covalent bond where electrons are not shared equally

Question 9)

Answer: option A

Reason: cohesive, that's the name of the property that allows molecules of the same compound to stick together.

Question 10)

Answer: option B

Reason: hydrophilic, that means it has an attraction for water

Question 11)

Answer: option C

Reason: at the bottom, the denser is something, more tendency to go down

Question 12)

Answer: option D

Reason: heat capacity, that's a property that measures the amount of heat a substance can absorb.

Question 13)

Answer: option B

Reason: acidic because in the pH scale anything below 7 is acidic

Question 14)

Answer: option A

Reason: acids because Arrhenius defined an acid as a substance that gives protons in water.

Question 15)

Answer: option D

Reason: buffers because they can support pH changes.

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