Tin is atomic number 50. The means that all tin atoms have?
50 protons in the nucleus
50 neutrons in nucleus
50 electrons
After the 4s subshell of an atom is filled with electrons, the next electron added will enter the
3d subshell
4d subshell
4p subshell
In which of the following pairs of elements are both members of the pair metals?
P and O
Nb and Ar
Ag and Bi
The modern periodic table arranges the elements in order of
year of discovery
reactivity with oxygen
increasing number of protons
Isotopes of a given element ________
have the same mass number but different numbers of protons
have different mass numbers but identical numbers of protons
have the same mass number but different chemical properties
In which of the following measure numbers are all of the zeros significant
0.0705
0.000440
3.945900
What is the mass, in grams, of 30.7 mL of a liquid if its density is 0.81 g/mL?
25 g
3.8 g
38 g
If the temperature of an object is 435 degrees C what is the temp on a Kelvin scale?
162 K
708 K
608 K
A sample of the element calcium weighing 42.923 grams was dropped in a graduated cylinder containing 22.30 mL of water. The volume of the water plus the sample was 23.90 mL. What is the density of calcium?
1.796 g/mL
26.83 g/mL
19.3 g/mL
Express 4.5 x 10^4 liters in milliliters
4.5 x 10^3
4.5 x 10^7
4.5 x 10^6
Glass has a density of 2.05 g/mL. What is the volume of 46.3 grams of glass?
94.9 mL
0.0443 mL
22.6 mL
The density of table sugar is 1.59 g/mL. What is the mass if you have 3.14 mL?
0.501 g
1.98 g
4.99 g
In which of the following pairs of properties are both properties chemical properties?
freezes at 10 degrees C and nonflammable
decomposes at 500 degrees C and reacts with bromine
poor conductor of heat and is reddish brown in color
In which of the following pairs of measured numbers does each member of the pair contain the same number of sig figs?
10.3 and 10.30
800.0 and 80
0.000096 and 960.000
The measurement 8310.90 expressed in scientific notation becomes
8.3109 x 10^4
8.3109 x 10^2
8.3109 x 10^3
The density of an object is the ratio of its
length to volume
mass to volume
mass to height
In which of the following sequences of elements do all members of the sequence have chemical symbols starting with the same letter?
sulfur, silicon, sodium
gold, silver, aluminum
potassium, phosphorus, lead
Which of the following changes is a chemical change?
melting of ice
pulverizing of hard sugar cubes
rusting of iron
Your sweetheart gives you 1.25 lb. of Seattle's Chocolates for Valentine's Day. How much is this in grams?
908 g
568 g
363 g
This states that any compound is always made up of elements in the same proportion by mass.
Dalton's Atomic Theory
Octet Rule
Law of Definite Composition
An element is a substance that
can be broken down into simpler substances by physical means
cannot be broken down by chemical or physical means
can be broken down by chemical means
The description "two substances present, two phases present" is correct for
heterogeneous mixtures
homegeneous mixtures
elements
Electrons in an orbital always-
spin in the same direction
are neutral
spin in opposite direction
Group 11A is the
alkaline earth metals
Halogens
Noble Gases
Which of the following elements is a metalloid?
Si
Pb
Al
A substance has a freezing point of -20 degrees C. This is an example of a:
Physical property
chemical property
physical change
What is true about metal elements to nonmetal elements?
more nonmentals than metals
more metals than nonmetals
there are no nonmetals
Matter is neither created nor destryoed:
Law of Conservation of Matter
Elements in groups 1A and 11A are referred to as the?
p-block elements
d-block elements
s-block elements
What subatomic particles are found in the nucleus?
proton and electrons
protons
neutrons and protons
Express the length 3.22 mm in centimeters.
3.22 cm
322 cm
0.322 cm
What are the horizontal rows of the periodic table called?
Group
Periods
Families
The properties of ductility, malleability, ability to conduct heat and electron characteristics of what type of materials ?
All Elements
Metallic Elements
Metalloids Elements
Nonmetallic elements This term used to describe how consistently several measurements of some quantity give the same result is?
Exactness
Accuracy
Precision
An atom contains 33 protons, 35 neutrons and 33 electrons. The atomic number and mass number for the atoms are, respectively.
35 and 33
33 and 35
33 and 68
In which of the following sequences of elements does each of the elements have a two-letter chemical symbol.
Barium, iron, nitrogen
Silicon, zinc, hydrogen
Selenium, nickel strontium
