Units 1&2 – Chemistry Flashcard

How many significant figures should be retained in the result of the following calculations?
(11.3-2.6) * 10^4 / (103.05) + 10^-6

A. 4
B. 3
C. 5
D. 1
E. 2

The volume of a regular cylinder is V=(pi)r^2(h). Using the value 3.1416 for the constant pi, the volume of a cylinder of radius 2.34 cm, and height 19.91 cm expressed to the correct number of significant figures is which of the following?

A. 342.49471
B. 342.49
C. 342
D. 342.495
E. 343

In the rock cycle, weathering and erosion due to wind are considered:

A. both as physical changes
B. both as chemical changes
C. both as biochemical changes
D. erosion is a physical and the weathering is a chemical change
E. both as nuclear changes

The photosynthesis reaction shown is considered a chemical change because:
6CO2 + 6H20 –> C6H12O6 + 602

A. the substances produced are different from the reactants
B. oxygen evaporates to the atmosphere
C. it involves water and water is always present in chemical changes
D. there are 6 carbon atoms on each side of the equation

Which one of the following is NOT one of the postulates of Dalton’s atomic theory?

A. each element is composed of tiny, indivisible particles called atoms.
B. atoms of an element are not changed into different types of atoms by chemical reaction.
C. compounds are formed when atoms of different elements combine
D. during a chemical reaction, atoms are changed into atoms of different elements
E. all atoms of a given element are identical to each and different from those of other elements.

A list of pure substances include :

A. vinegar(5% acetic acid)
B. glucose(C6H12O6)
C. sea water
D. cookie dough
E. saline solution

When sample X is passed through a filter paper, a white residue (Y) remains on the filter paper and a clear liquid Z passes through. When the liquid Z is vaporized, another white residue remains. Liquid Z is best classified as a :

A. solution
B. colloid
C. element
D. compound
E. heterogeneous mixture

Which of the following is an example of a colloid?

A. latex paint
B. vinegar
C. table salt
D. Germ-X
E. liquid gold

Au-197 has 118 neutrons. The neutral atom has

A. 79 electrons
B. 118 neutrons
C. 42 electrons
D. 38 neutrons
E. 197 electrons

Which one of the following is NOT an intensive property?

A. pressure
B. density
C. mass
D. melting point
E. temperature

If matter is uniform throughout and cannot be seperated into other substances by physical means, it is which of the following?

A. either an element of a compound
B. an element
C. a compound
D. a homogeneous mixture
E. a heterogeneous mixture

Isotopes are atoms of the same element that have different
A. principal chemical properties
B. electron configurations
C. numbers of electrons
D. numbers of protons
E. number of neutrons
All isotopes of helium contain

A. 2 neutrons
B. 2 protons
C. one neutron
D. 2 nuclei
E. 2 electrons

Which of the following is an impossible set of quantum numbers (n,l,ml,ms)

A. 4,1,1,+1/2
B. 4,1,0,+1/2
C. 4,2,1,+1/2
D. 4,0,1,+1/2
E. 4,0,0,+1/2

Which of the following is FALSE?

A. the 4f orbitals are in the sixth period of the periodic table
B. the 4d orbitals are in the fourth period of the periodic table
C. the 6s orbitals are spherical in shape
D. the 7s orbitals are in the seventh period of the periodic table
E. the 5p orbitals are dumbbell shaped

A list of pure substances could include

A. vinegar (5% acetic acid)
B. glucose (C6H1206)
C. sea water
D. cookie dough
E. saline solution


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