Question : 5.1   Multiple Choice 1) Which of the following statements not a : 1282482

5.1   Multiple Choice

1) Which of the following statements is not a part of atomic theory?

A) Chemical change involves a union, separation, or rearrangement of atoms.

B) A pure substance will have a varying relative number of atom types.

C) All matter is made up of atoms.

D) Atoms are considered indestructible during chemical change.

2) The diameters and masses of atoms are, respectively, on the order of ________.

A) 10−11 m and 10−11 g

B) 10−23 m and 10−10 g

C) 10−24 m and 10−10 g

D) 10−10 m and 10−23 g

3) Which of the following statements is incorrect according to the modern atomic theory?

A) An atom of 18O has the same approximate mass of an atom of 18F.

B) An example of a chemical reaction is 2C + O2 → 2 CO.

C) Some carbohydrates have a formula of C4.5H9O4.5.

D) H2O and H2O2 are possible compounds of hydrogen and oxygen.

4) Which one of the following statements about atoms is correct?

A) The proton is the smallest “piece” of an atom that can exist and still have the properties of the atom.

B) Free, isolated atoms are virtually never encountered in nature.

C) Atoms may be decomposed using physical change.

D) Two kinds of atoms may be present in a homoatomic molecule.

5) Which one of the following statements about molecules is correct?

A) Some compounds have molecules as their basic structural unit.

B) For a molecular compound, the atom is the limit of chemical subdivision.

C) For a molecular compound, the atom is the limit of physical subdivision.

D) Molecules of compounds may be either heteroatomic or homoatomic.

6) Which one of the following statements about heteroatomic molecules is incorrect?

A) Atoms in a heteroatomic molecule may be the same atom.

B) Upon chemical subdivision, heteroatomic molecules always yield two or more kinds of atoms.

C) Heteroatomic molecules do not maintain the properties of their constituent elements.

D) Elements are never heteroatomic molecules.

7) Which statement about ionic compounds is incorrect?

A) Ionic compounds do not contain individual molecules.

B) Ionic compounds are charged, they are not electrically neutral.

C) Ionic compounds have an extended 3-dimensional assembly of ions.

D) Ionic compounds do not share the characteristics of the constituent elements.

8) Which statement concerning the molecules depicted is incorrect?

A) The molecules in box I represent a pure substance.

B) The molecules in box III represent a mixture of elements.

C) The molecules in box II represent a compound composed of two different elements.

D) The molecules in box IV represents two different compounds and an element.

9) A compound that is made in the laboratory is called a ________ compound while a compound found in nature is called a ________ compound.

A) synthetic, natural

B) natural, synthetic

C) synthetic, synthetic

D) natural, natural

10) An example of a compound that was once found in mold but is now made synthetically is ________.

A) cyclosporin

B) penicillin

C) vitamin C

D) aspirin