Exam 1 Flashcards
Consider the following processes:
(i) making Kool-AidTM by dissolving Kool-AidTM mix and sugar in water
(ii) carbonating water by pressurization with carbon dioxide
(iii) corrosion of metal on your car
(iv) burning your chemistry textbook
(v) condensation of water vapor from your breath on a mirror
Which of these processes are correctly referred to as a “physical change”?
A. (i), (iii) and (v)
B. (ii) and (iii)
C. (ii) and (iv)
D. (ii), (iii), (iv), and (v)
A. (i), (iii) and (v)
(making Kool-aid by dissolving kool-aid mix and sugar in water, carbonating water by pressurization with carbon dioxide, and condensation of water vapor from your breath on a mirror)
Which of the following are correctly referred to as “extensive properties”?
(i) mols of a substance
(ii) mass of a substance
(iii) density of a substance
(iv) volume of a substance
(v) temperature of a substance
A. (i) and (ii)
B. (iii) and (v)
C. (i) (ii) and (iv)
D. (ii), (iii), and (v)
C. (i) (ii) and (iv)
mols, mass, and volume
Which of the following is correctly expressed to three significant figures? A. 120 B. 1.20 x 10^1 C. 0.012 D. 0.0120 E. 0.01201
B and D
Which of the following processes does not represent a physical change?
A. separation of a solid from a liquid by filtration
B. separation of two liquids by distillation
C. freezing a liquid
D. forming a crystalline solid by evaporating sea water
E. all of the above are physical changes
E. all of the above are physical changes
Which term best describes the following? There is only one correct answer.
Molecular oxygen is ______(i)_______, gasoline is ______(ii)_________ and carbon dioxide is _______(iii)___________.
A. (i) an element; (ii) a compound; (iii) a homogeneous mixture
B. (i) a compound; (ii) a heterogenous mixture; (iii) a compound
C. (i) an element; (ii); a compound (iii) an element
D. (i) an element; (ii) a homogeneous mixture; (iii) a compound
E. (i) a compound; (ii)a homogeneous mixture; (iii) an element
D. (i) an element; (ii) a homogeneous mixture; (iii) a compound
If a particular substance can be separated into simpler substances by physical means, then that substance could be: A. a mixture B. a compound C. a solution D. either (a) or (c) E. either (a), (b), or (c)
D. either (a) or (c)
The identity of an element is defined by which of the following subatomic particle(s):
(i) number of protons
(ii) number of neutrons
(iii) number of electrons
A. (i), (ii) and (iii) B. (i) and (ii) only C. (i) and (iii) only D. (i) only E. (ii) only
D. (i) only
The observation of the phenomenon of radioactivity was key to understanding the subatomic nature of matter. Which of the following was NOT observed as being emitted from the nucleus from a radioactive source such as uranium for the experiment we discussed?
A. alpha particles B. beta particles C. gamma rays D. protons E. all of the above were omitted
D. protons
Given that SO4^2- is the sulfate ion, what is the formula for sulfurous acid?
A. H2S B. HSO4 C. HSO3 D. H2SO4 E. H2SO3
E. H2SO3
Which of the following tenets of Dalton’s atomic theory of matter is not true based on what we know now? Check ALL of the answers that are NOT true, this is a multiple response question.
A. Each element is composed of atoms
B. All atoms of an element are identical.
C. In chemical reactions, the atoms are not changed.
D. Compounds are formed when atoms of more than one element combine.
E. atoms cannot be broken down into simpler, smaller particles
B and E
Which of the following is most massive?
A. a gamma ray B. an alpha particle (helium nucleus) C. a proton D. a neutron E. a beta particle (high energy electron)
D. a neutron
Which of the following is NOT postulated in Dalton’s original atomic theory of matter?
A. Each element is composed of atoms
B. All atoms of an element are identical.
C. In chemical reactions, the atoms are not changed.
D. Compounds are formed when atoms of more than one element combine.
E. atoms consist of subatomic particles called protons, neutrons, and electrons
E. atoms consist of subatomic particles called protons, neutrons, and electrons
Remarkably, most of the atoms in the periodic table are stable and do not undergo radioactive decay. The major attractive between the proton and electron in a stable atom is ___(i)____, and the major attractive force between protons in a stable atom is _____(ii)______.
A. (i) electromagnetic; (ii) electromagnetic
B. (i) electromagnetic; (ii) nuclear
C. (i) nuclear; (ii) electromagnetic
D. (i) nuclear; (ii) gravitational
E. (i) gravitational; (ii) electromagnetic
B. (i) electromagnetic; (ii) nuclear
Elements that can exist in nature in different molecular forms are called:
A. isotopes B. ions C. allotropes D. isomers E. geotropes
C. allotropes
Neutrons are fired from a radioactive source through a pair of oppositely charged plates. In which direction will the neutrons be deflected?
A. towards the positive plate B. towards the negative plate C. they will not be deflected at all D. an equal number will be deflected towards both the positive and negative plates E. it is not possible to predict
C. they will not be deflected at all
