Chemistry

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

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: ∙


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