Chemistry
which measurement contains a total of 3 significant figures
0.0100 g
standard temperature and pressure are
0°C and 760 mmHg
which quantity is equivalent to 39 grams of LiF
1.5 moles
which group contains a metalloid?
15
the molar mass of Ba(OH)₂ is
173.3 g
the maximum number of electrons that may be found in the 3rd principal energy level is
18
at STP 44.8 liters of CO₂ contains the same number of molecules as
2.00 moles of a Ne
which kelvin temps represent the normal freezing point and the normal boiling point of water
273 k and 373 k
What is the total number of orbitals containing only one electron in an atom of nitrogen in the ground state?
3
what is the maximum number of sub levels in the 3rd principle energy level?
3
how many atoms are there in 3 moles of Al?
3(6.0x10²³)
which kelvin temperature is equal to 56°C?
329K
A sample of element X contains 90 % ³⁵X atoms, 8.0 % ³⁷X atoms, and 2.0 % ³⁸X atoms. the average atomic mass is closest to ____
35
In which of the following periods of the periodic table are transition metals found
4
which quantity is equivalent to 50 kilocalories?
5 x 10⁴ cal
what is the total number of protons and neutrons in the nuclide ₃₅⁸⁰ Br
80
which atom has a nucleus that contains 13 protons and 14 neutrons?
Al
Which terms are used to identify pure substances?
An element and a compound.
Which gas could have a density of 2.05 grams per liter at STP
NO₂
which compound contains an alkali metal and a halogen?
RbCl
which element would have properties characteristic of both a metal and a nonmetal
Si
Berylium is classified as
an alkaline earth metal
All the atoms of argon have the same
atomic number
when the vapor pressure of a liquid equals the pressure on its surface, the liquid will_____
boil
What is an example of a chemical change?
decomposing of water
which has the least mass
electron
which of the following particles has the smallest mass
electron
Particles in order of increasing mass
electron, proton, alpha particle
represents the change of a substance from the solid phase to the liquid phase
fusion
the equation ₁²H+₁²H→₂⁴He represents
fusion
which statement correctly describes a sample of gas confined in a sealed container?
it takes the shape and the volume of any container in which it is confined.
the nuclides ¹⁴C and ¹⁴N are similar in that they have the same _____
mass number
at STP equal volumes of N₂ (g) and CO₂ contain equal numbers of _____
molecules
compared to 1 mole sample of hydrogen at 273 K and 1 atmosphere, a 1 mole sample of hydrogen at 298 K and 1 atmosphere contains
molecules having higher average kinetic energy
equal volumes of SO₂(g) and NO(g) at the same temperature and pressure would have the same ______
number of molecules
Lithium and Potassium have similar chemical properties because the atoms of both elements have the same
number of valence electrons
As a radioactive element emits gamma radiation only, the atomic number of the element______
remains the same
as a given volume of gas is compressed, the number of molecules_____
remains the same
which pair of atoms are isotopes of element X?
²²⁶X and ²²⁷X ⁹¹ ⁹¹
What is the electron do symbol for an atom with an electron configuration of 1s² 2s² 2p³
∙ ∙x: ∙