Question | Answer |
`Study of the composition and structure of materials and the changes that materials undergo best describes the science of | Chemistry |
A physical Property may be invested by | melting ice |
Technology is the | analysis ochemical behavior |
Elememts in a group in the periodic table can be expected to have similar | properties |
The elements that border the zigzag line in the periodic table are | metalloids |
Two features that that distiguish matter are | mass and volume |
The particles in solids are | packed closely together |
The state of matter in hich a material has a def. shape and def. volume | solid state |
The most useful source of chemical information about the elememts | periodic table |
The branch of chemistry that is concerned with the identification and composition of materials is | analytical chemistry |
*Quantitative observations are recorded using | numerical info. |
Qualitative observations are recorded using | non-numerical information |
The SI units for length and mass are | meter and kilogram |
The symbol for the metric unit to maesure mass is | g |
a change in Earth's gravity on an object will sffect its | weight |
To determine density, he qualities that must be measured are | volume and mass |
Poor precision in scientific measurement may arise from | both human error and the limitations of the measuring indtrument |
The number of sig figs in the measurement 0.000 305 kg is | 3 |
what would be the most appropriate SI unit for expressing the mass of a single brick | Kilograms |
Why should scientists record all observations, even those that appear insignificant | They should b/c later on another scientist could use their observations for another research or something |
* Rutherfords experiments led to the discovery of the | nucleus |
organic chemistry is the study of | carbon containing compounds |
What is the atomic number for aluminum | 13 |
Sulphur-34 contains | 18 neutrons |
Gamma rays are | electromagnetic wave |
what unit messures radiation | roentgen |
what scientist discovered electrons | J.J Thompson |
what are often used to monitor the approx. radiation exposure of people working with radioactive materials | film badges |
What is the atomic number for Tungsten | 74 |
isotopes of an element contain different numbers of | neutrons |
* The distance between two successive peaks on a wave is its | wavelength |
In SI, the frequency of electromagnetic radiation is measured in | hertz |
A quantum of electromagnetic energy is called an | photon |
a 3-dementional region around a nucleus where an atom may be found is called an | orbital |
How many quantum #'s are needed to describe the energy state of an electron in an atom | 4 |
The number of orbitals for the d sublevel is | 5 |
For the f sublevel, the number of orbitals is | 7 |
What is the total number of electronsd neeeded to filolo the first 2 main energy levels | 10 |
The atomic sublevel with the next highest energy level after 4p is | 5s |
The main energy level that can hold only 2 eletrons is the | first |
*Mendeleev is credited with developing the first successful | periodic table |
To which group does lithium and potassium belong to | alkali metals |
elelments to the right side of the periodic table(p-block elements) have properties most associated with | metals |
The energy required to move an electron from an atom is the atoms | ionization energy |
A measure of the ability of an atom in a chemical compound to attract electrons is called | electronegativity |
The element that has the greatest electronegativity is | Fluorine |
1/2 the distance between the nuclei of identical atomsd that are bonded together are called | atomic radius |
A positive ion is known as a | cation |
The number a valence electrons in Group 2 elements is | 2 |
within a group of elements, as the atomic number increases, the atomic radius | increases |
*A mutual electrical attraction btween the nuclei and valence electrons of different atoms that binds atoms together is called | chemical bond |
Atoms are ----- when they are combined | more stable |
Most chemical bonds are | partly ionic and partly covalent |
A covalent bond results when---are shared | electrons |
An octet is = to? | 8 |
The elements of the---- group satisfy the octet rule w/out forming compounds | noble gas |
TO draw a lewis structure, one must know the | number of valence electrons in each atom |
How many double bonds are in the lewis structure for hydrogen fluoride, HF | one |
Malleability are ductility are characteristics of substances with | metallic bonds |
A chemical bond resulting from the electrostatic attraction b/t positive and negative ions is called an | ionic bond |