Question

Answer

Explanation

31 An Arrhenius acid has

(1) only hydroxide ions in solution
(2) only hydrogen ions in solution
(3) hydrogen ions as the only positive ions in solution
(4) hydrogen ions as the only negative ions in solution

3

Acid H+ base OH-

32 Which type of radioactive emission has a positive charge and weak penetrating power?

(1) alpha particle     (3) gamma ray
(2) beta particle      (4) neutron

1

Alpha +

Beta –

Neutron no charge

Gamma no charge

1

The metal has a metallic bond. Mercury-Hg

34 What is the name of the process in which the nucleus of an atom of one element is changed into the nucleus of an atom of a different element?

(1) decomposition     (3) substitution
(2) transmutation      (4) reduction

2

Definition transmutation

35 A catalyst is added to a system at equilibrium. If the temperature remains constant, the  activation energy of the forward reaction

(1) decreases
(2) increases
(3) remains the same

1

Catalyst lowers the activation energy

36 The nucleus of an atom of K-42 contains

(1) 19 protons and 23 neutrons
(2) 19 protons and 42 neutrons
(3) 20 protons and 19 neutrons
(4) 23 protons and 19 neutrons

1

Potassium has 19 protons always

42-19=23 neutrons

37 What is the total number of electrons in a Cu⁺ ion?

(1) 28     (3) 30
(2) 29     (4) 36

1

A Copper ATOM has 29 electrons but it is an ion here so 28.

38 Which list of elements is arranged in order of increasing atomic radii?

(1) Li, Be, B, C         (3) Sc, Ti, V, Cr
(2) Sr, Ca, Mg, Be     (4) F, Cl, Br, I

4

Fallen down snowman

39 Which isotope is most commonly used in the radioactive dating of the remains of organic materials?

(1) 14 C      (3)32 P
(2) 16 N      (4)37 K

1

Organic =carbon

40 According to Reference Table H, what is the vapor pressure of propanone at 45°C?

(1) 22 kPa      (3) 70. kPa
(2) 33 kPa      (4) 98 kPa

3

Look it up table H