Question | Answer |
Basic research is | carried out for the sake of increasing knowledge. |
Applied research is | carried out to solve a problem. |
Chemical properties | include changes that alter the identity of a substance. |
A physical property may be investigated by | melting ice. |
The study of substances containing carbon is | organic chemistry. |
Two features that distinguish matter are | mass and volume. |
An example of extensive property is | mass. |
Group ___ in the periodic table contains only metals | 2. |
Physical means can be used to separate | elements. |
Which is not a property of meatals? | unreactivity. |
All of the following are steps in the scientific method EXCEPT | discarding data inconsistant with the hypothosis. |
Which of the following observations is quantitive? | The liquid boils at 100 degrees celcius. |
Quantitive observations are recorded using | numerical information |
Qualitive observations are recorded using | non-numerical information |
A testible statement used for making predictions and carrying out futher experiments is a | hypothesis |
The SI standard units for length and mass are | meter and gram |
The unit m(3)is | volume |
A change in the force of earth's gravity on an object will affect it's | weight |
To two sig figs, the measurement 0.00255 g should be reported as | 0.026 g |
The number of sig figs in the measurment 0.000305 kg is | 3 |
Who was the schoolmaster who studied chemistry and proposed an atomic theory? | John Dalton |
A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a | neutron |
Who discovered the nucleus by bombarding gold foil with positively charged particles? | Rutherford |
Rutherfor'd expiriment lead tot he discovery of the | nucleus |
Experiments with cathode rays led to the discovery of the | electon |
Isotopes of an element contain different numbers of | neutrons |
The atomic number of oxygen 8, indicates that there are 8 | protons in the nucleus of an atom. |
Nickle-30 has | 32 neutrons |
The half-life of an isotope is the time required for half the nuclei in a sample to | undergo radioactive decay |
Whuch of the following has the greatest penetrating ability | gamma rays |
For electromagnetic radiation, c (the speed of life)equals | frequency times wavelength |
Which of the following processes always decreases the number of protons by an even number? | alpha decay |
Gamma rays are | electromagnetic waves |