Question

QUESTION 1

Which of the following particles are found in the nucleus of an atom?

A. protons and neutrons B. protons and electrons C. neutrons and electrons D. neutrons, electrons, and protons

QUESTION 2

Which of the following best describes the atomic number of an atom?

A. the number of protons in the atom B. the number of electrons in the atom C. the number of neutrons in the atom D. the number of protons, electrons, and neutrons in the atom

QUESTION 3

What is the fundamental difference between covalent and ionic bonding?

A. In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other. B. In covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not. C. Covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell. D. Covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements.

QUESTION 4

A hydrogen atom has one electron. How many covalent bonds can hydrogen form?

A. one B. two C. four D. none

QUESTION 5

Table salt is formed when:

A. chlorine gives an electron to sodium B. a hydrogen bond forms between sodium and chlorine C. sodium and chlorine share electrons to form a bond D. sodium donates its single outer electron to chlorine

QUESTION 6

________ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.

A. Ionic bonds B. Covalent bonds C. Polar covalent bonds D. Hydrogen bonds

QUESTION 7

The hydrogen atoms of a water molecule are bonded to the oxygen atom by ________ bonds, whereas neighboring water molecules are held together by ________ bonds.

A. hydrogen; polar covalent B. polar covalent; hydrogen C. ionic; covalent D. polar covalent; ionic

QUESTION 8

A solution with a pH of 7 is

A. strongly acidic B. weakly acidic C. neutral D. weakly basic

Answer 1

QUESTION 1

Answer is A. protons and neutrons

Because the nucleus of atom contains protons and neutrons and the electrons are present in outer orbit.

QUESTION 2

Answer is B. the number of electrons in the atom

The atomic number of an atom is equal to the number of electrons present in the atom. For example Carbon has 6 electrons therefore the atomic number of carbon is 6.

QUESTION 3

Answer is A. In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other.

A covalent bond is also called as molecular bond that involves the sharing of electron pairs between atoms. Whereas, Ionic bond is the complete transfer of valence electron(s) between two atoms. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the non-metal accepts those electrons and become a negatively charged anion.

QUESTION 4

Answer is A. one

The hydrogen atom only has 1 electron so it can share only one electron with other atom. Therefore only one covalent bond is possible with one hydrogen atom.

QUESTION 5

Answer is D. sodium donates its single outer electron to chlorine.

NaCl is table salt, in which sodium and chlorine form ionic bond, Na⁺ is metal ion and Cl^- is non metal ion. Na⁺ has 1 electron in outer shell and chlorine has one deficient to complete the octate. Therefore sodium will transfer one electron to chlorine to compete the octate arrangement of electrons.

QUESTION 6

Answer is D. Hydrogen bonds

A hydrogen bond is a weak force of attraction between two atoms or ions with opposite charges. The hydrogen-oxygen bonds in water are polar bonds. Hydrogen bonds are strong enough to hold molecule together but weak enough to break apart.

QUESTION 7

Answer is B. polar covalent; hydrogen

The bond formed between hydrogen and oxygen atom of H2O molecule is polar covalent bond, in which 2 hydrogen atom share their electrons with an oxygen atom. However, the bond between two molecule of water is hydrogen bond.

QUESTION 8

Answer is C. neutral

In the pH scale, the range is from 0 to 14. If pH is 7 then it is neutral. If pH is less than 7 then it is acidic and if pH is greater than 7 it means it is basic.