An element with 15 protons, 16 neutrons, and 15 electrons would have an atomic n

Question

An element with 15 protons, 16 neutrons, and 15 electrons would have an atomic number of _____ and a mass number of _________. a. 15 ...... 16 b. 15 ...... 31 c. 30 ...... 16 d. 16 ...... 31 e. 31 ...... 15 Which of the following results from a transfer of electron (s) between atoms? a. nonpolar covalent bonds b. polar covalent bonds c. ionic bond d. hydrogen bond e. hydrophobic interactions Water molecules stick to each other because: a. water molecules arc nonpolar, and nonpolar molecules stick together. b. hydrogen bonds form between the hydrogen atom of one water molecule and the oxygen atom of another water molecule c. hydrogen bonds form between the hydrogen atom of one molecule and a hydrogen atom of another molecule. d. covalent bonds form between the hydrogen atom of one molecule and the oxygen atom of another molecule. Water has high specific heat. This helps a. aquatic organisms to survive during severe winter conditions. b. to prevent dehydration of living organisms. c. in maintaining chemicals in body fluids. d. living organisms in maintaining their body temperature. c. certain organisms to land/walk on water. Which of the following solutions would be expected to have the highest H^+ concentration? a. black coffee at pH 5 b. gastric juice at pH 2 c. sea water at pH 8 d. tomatoes at pH 4 e. Household ammonia at pH 11 Glucose and fructose have the same molecular formula but different molecular structure. They are called a. isotopes b. ions c. isomers d. polar molecules e. radioactive molecule

Explanation / Answer

6. The correct option is b. Atomic number is always equal to number of protons. And number of protons is equal to number of electrons.

7. The correct option is c. Ionic bond is formed by the transfer of electrons.

8. The correct option is b. Hydrogen bonding between the two molecules of water is responsible for stickness in water molecules.

9. The correct option is a. Water has high specific capacity of heat which allows the aquatic animals to survive at low temperature.

10. The correct option is b. Gastric juice with lowpH will have more H+ concentration.

11. The correct option is c. Isomers have same molecular formula but different chemical structure.

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