H-Chem Neimeyer Chapter 2 Test
calculate the number of moles in 0.48g of Cu.
7.6 X 10^-3
you have 2.50g of each of the following elements: Ca, Cu, Cs, and Cr. which sample contains the largest number of atoms?
C
which of the following is the correct formula for calcium nitrate?
Ca(NO3)2
the chemical formula for chromium(III) sulfate is:
Cr2(So4)3
two isoptopes of a given element have the same number of _______, but a different number of ________ in their nucleus.
1. protons 2. neutrons.
Arrange the subatomic particles in order of their increasing mass.
1.electron mass 2. proton mass 3. neutron mass
A certain element consists of two stable isotopes. the first has a mass of 14.0031 amu and a percent natural abundance of 99.63%. the second has a mass of 15.001 amu and a percent natural abundance of 0.37%. what is the atomic weight of the element.
14.01 amu
What is the approximate mass of 0.71 mol Na?
16g
what is the mass of chlorine-35 relative to carbon-12?
2.92
how many protons are there in an atom of Sc 45
21
how many protons are there in an atom of scandium-45?
21
a sample of an element consists of two isotopes. The percent abundance of one of the isotopes is 75.0%. what is the percent abundance of the other isotope?
25.0%
how many protons, neutrons, and electrons are present in an atom of iron-59?
26 protons, 33 neutrons, and 26 electrons
which of the following is correct? 1. a hydrogen atom with one proton and zero neutrons is assigned a mass of exactly one atomic mass unit. 2. one atomic mass unit is equivalent to 9.11 X 10^23 3. a caron atom with six protons and six neutrons is assigned a mass of exactly 12 atomic mass units.
3 only
which of the following statements is/are correct? 1. the group 3a elements are also known as the chalogens. 2. the noble gases are sometimes called rare earth metals 3. the halogens, or group 7A elements all exist as diatomic molecules
3 only
a nail is coated with 0.053 cm thick layer of zinc. The surface area of the nail is 8.59 cm^2. The density of zinc is 7.13 g/cm^3. How many zinc atoms are used in the coating?
3.0 X 10^22
How many neutrons are there in an atom of copper-63?
34
what is the mass number of an atom of argon with 22 neutrons?
40
what is the common name for the compound PH3?
Phosphine
what is the correct name for Cd2+
cadmium (II) ion
The element chlroine has two stable isotopes, chlorine 35 with an atomic mass of 34.97 u and chlorine 37 with an atomic mass of 36.97 u. from the atomic weight found on the periodic table, one can conclude what?
chlorine 35 has the highest percent natural abundance
what is the correct symbol for 30 neutrons and a mass number of 50
d
what is selenium?
metalloid
what element has 58 neutrons and 28 protons?
nickel
Atoms are made of three subatomic particles. What are these particles and their charges?
proton(+1) neutron(0) electron(-1)
how can you tell how many nuetrons there are in an atom chart thing? 23 H 12
subtraction
lithium has two naturally occuring isotopes ^6Li and ^7Li. The atomic weight of lithium is 6.941. What is correct concerning the relative abundance of each isotope is correct?
the abundance of ^7Li is greater than ^6 Li
how can you tell which part of an atom chart thing has more protons than neutrons? 23 H 12
the bottom number is higher than the top number
what is true concerning ^16O and ^17O?
they are isotopes
if two different isotopes have the same atomic number it means___-___
they have the same number of protons
if two different isotopes have the same atomic number, it means what?
they have the same number of protons
how to find the molar mass of something
(element mass X how many of that element there is) +(element 2 mass X how many of that element 2 there is)
how do you do percent abundance?
(x) + (100-x) = 100
what mass of aluminum contains the same number of elements as 3.0g of lead?
0.39g
what charge is likely possible on a monatomic silver cation?
1+
what is the charge on the sodium ion in Na3P
1+
what group of the periodic table only contains nonmetals?
7A
a neutral atom of an isotope ^200Hg contains how many protons, neutrons, or electrons?
80 protons and 120 neutrons
what is the atomic number of fluorine?
9
the formula for aluminum fluoride is:
AlF3
what is the correct atomic symbol of an element that has 30 neutrons and a mass number of 55?
Mn
Scandium(III) sulfite is an ionic compound formed from Sc3+ and SO3^2-. what is the correct way to represent the formula?
Sc2(So3)3
which of the following atoms contains the least protons?
^232Th
an atom that has the same number of electrons as nickel-59 is ?
^58 Co
a form of acetic acid, CH3CO2H is an example of what?
a condensed formula
the masses of isotopes and their abundances are determined experimentally using ___-?
a mass spectormeter
what kind of metal is barium?
alk. earth metal
what is the common name of the group that has an element with 38 protons in its nucleus?
alkaline earth metals
what is true concerning ionic compounds are correct?
as ion charges increase, the attraction between oppositely charged ions increases. positive and negative ions are attracted to each other by electrostatic forces
how to find the number of moles in a thing?
given mass divided by molar mass
how do you solve for atomic weight?
if there are two isotopes (mass of 1 X % of 1) + (mass of 2 X % of 2)
elements in groups 1a-8a are known as the _____?
main group elements