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CHemistry Chapter 4
Question | Answer |
---|---|
JJ Thompson | Experiment is the Cathode created in 1897. |
How JJ Thompson knew the ray was composed of negatively charged particles. | Cathode are deflected by a magnetic field in the same way a wire carrying an electric current which is known to have a negative charge. |
The presence of a negatively charged particle within a neutral structure such as the atom is an indication of what? | The rays are deflected away from a negatively charged object. |
Elements are composed of tiny particles called? | Atoms |
Atoms of any element are____ from those of any other element. | Different |
Atoms of different elements can form ___ by combining in whole-number rations. | Compounds |
Chemical reactions occur when atoms are? | Separated, joined, or arranged. |
Atoms of one element change into atoms of another element during chemical reactions. Always true, never true, sometimes true. | NT |
Atoms combine in one-to-one ratios to form compounds. AT,NT, ST | ST |
Atoms of one element are different from atoms of other elements. AT, NT, ST | AT |
Atom | the smallest particle of an element that retains its identity in a chemical reactions. |
Scanning Tunneling microscope | an instrument used to generate images of individual atoms. |
John Dalton | English chemist and schoolteacher who formulated a theory to describe the structure and chemical reactivity of matter in terms of atoms. |