Zinc oxide contains 80.3% zinc. What size sample of zinc oxide would contain 5.35g of zinc?
How much heat energy is required to raise the temperature of 4.50L of water from 36.0ºC to 44.6ºC?
In which phase do the particles possess the greatest amount of kinetic energy?
Question 28 answers
The number, 14.74999, when rounded to three digits is
The temperature of 400 degrees Celsius is equal to
A liquid has a mass of 40.24g and a volume of 50.0mL. What is its density?
When expressed in proper scientific notation the number 0.000034 is:
3.4 X 104
3.4 X 10-4
3.4 X 103
3.4 X 10-5
Which type of element has the following general properties: solid at room temperature, high luster, good conductor of heat and electricity, malleable and ductile?
How many atoms of hydrogen are present in one molecule of Al(H2PO4)3?
The sulfate group is SO4-2. How many sulfate groups are in the formula Fe2(SO4)3?
What is the atomic number of potassium?
The atomic mass of an element is
the mass of the most abundant isotope of that element.
the weighted average of the masses of the naturally occurring isotopes of that element.
the arithmetic average of the masses of the isotopes of that element.
the ratio of the mass of one atom of an isotope of that element to the mass of hydrogen.
Which term represents a form of energy?
A magnesium atom is converted to a magnesium ion when the atom
gains one electron.
gains two electrons.
loses one electron.
loses two electrons.
The elements in group 7A form ions with a charge of
What is the formula of aluminum sulfide?
Which is carbon tetrachloride?
What is the formula for the compound that forms between aluminum and oxygen?
Which of the following compounds is most likely to be an acid?
Which ions combined to form the compound PbO2?
Pb2+ and O-
Pb2+ and O2
Pb+ and O2
Pb4+ and O-2
In which pair would both compounds have the same empirical formula?
C2H4 and C3H6
K2CrO4 and K2Cr2O7
NaHCO3 and Na2CO3
FeCl3 and FeCl2
What is the mass of 0.118 moles of AgNO3?
7.10 x 1023 g
How many moles are present in 0.140g of HCl?
What is the molar mass of CaSO4?
What is the molar mass of Sr(NO3)2?