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Beatrice Chem SG
Chemistry Exam
| 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 |
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BeatriceByrd
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