Which of the following is most likely to exhibit covalent bonding? a. CaCl_2 b.

Question

Which of the following is most likely to exhibit covalent bonding? a. CaCl_2 b. Cs_2O c. CO_2 d. NaF e. NaCl The law of definite proportions states that _____. a. the elements forming a given compound always react in the same proportions. b. compounds such as NO and NO_2 have identical chemical properties. c. compounds such as NO and NO_2 must have masses that are whole-number multiples of each other. d. only one compound can be produced when two elements combine. e. nitrogen and oxygen can combine to form a variety of compounds, such as NO or NO_2. Which of the following is the SI base unit for mass? a. kg b. lb c. g d. m e. mg Identify the base in the following acid-base reaction. H_2PO^-_4 (aq) + H_2O(l) rightarrow HPO^2-_4 (aq) + H_3O^+(aq) a. H_2O b. You can't determine without a titration c. H_2PO^-_4 d. H_3O^+ e. This is not an acid-base reaction.

Explanation / Answer

7.c. CO2 forms covalent bonds.

Covalent bonds occur between two nonmetals. In CO2 carbon and oxygen both are nonmetals. Electrons are shared between carbon and oxygen atoms and covalent bonds are formed. Other compounds like CaCl2, Cs2O, NaF and NaCl form ionic bond, because Sodium (Na), Calcium (Ca) and Cesium (Cs) are metals.

8. a. The law of definite proportions states that elements forming given compound always react in same proportion is correct option.

Explanation- The law of definite proportions states that a given chemical compound always contains its component elements in fixed ratio and does not depend on its source and method of preparation. For e.g. Hydrogen and oxygen always combined in same proportion to produce water.

The atomic weight of hydrogen is = 1, and the atomic weight of oxygen is =16, so 18 g of H2O would be produce from 16 g of O, and 2 g of H.

9.a. kg is correct option

The kilogram is the SI base unit of mass.

10. a. H2O is correct option

Explanation- H2PO4^ - (aq) +H2O(l) <=>HPO4^2- (aq) +H3O^+ (aq)

H2PO4^- is acid and HPO4^ 2- is its conjugate base

H2O is base and H3O^+ is its conjugate acid

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