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Chemistry Exam midte
Chemistry Mid-Term Exam Review
| Question | Answer |
|---|---|
| He believed that atoms were indivisible and indestructible? | Democritus |
| He used experimental methods to transform Democritus's ideas on atomic theory? | John Dalton |
| He arranged the elements in his periodic table in order of increasing atomic mass? | Dmitri Mendeleev |
| He determined an atomic number for each known element? | Henry Moseley |
| He discovered the electrons? | J.J Thompson |
| He made a model known as the nuclear atom? | Ernest Rutherford |
| He proposed that an electron is found only in specific circular paths, or orbits, around the nucleus? | Neils Bohr |
| He confirmed the existence of yet another subatomic particle | James Chadwick |
| He carried out experiments to find the quantity of charge by an electron? | R.A Millikan |
| What are the basic steps of the the scientific method? | Making observations,testing hypotheses, and developing theories |
| What is a measure of the space occupied by the object? | Volume |
| What is a force that measures the pull on a given mass by gravity? | Weight |
| What is a measure of the amount of matter an object contains? | Mass |
| What is an intensive property that depends only on the composition of a substance , no the size? | Density |
| What are the three (primary) states of matter? Briefly describe each. | Solid: has a definite shape and volume, Liquid: indefinite shape, yet fixed volume, Gas,takes both the shape and size of its container. |
| A copper penny has a mass of 3.1 g and a volume of 0.35 cm3. What is the density of the copper? | |
| What is the law of conservation of mass? | Mass that cannot be created nor destroyed in a chemical reaction. |
| What does luster mean? | How shiny something is |
| List four properties of metals? | High luster , malleable, ductile good conductors of heat and electricity, hard shiny. |
| List at least four properties of nonmetals? | They rarely have metallic luster, usually gas a room temperature, neither malleable nor ductile, and poor conductors of heat and electricity. |
| List the Metalliods? | Boron, silicon, Germanium, arsenic, antimony, tellurium, and astatine. |
| describe the location of protons, neutrons, and electrons in the atom. Describe their charge and relative mass when compared to one another? | Proton located in the nucleus, charge +1; Neutron located in the nucleus, charge 0; Electron located outside the nucleus, charge -1. |
| What does the atomic number and mass number tell us about the atom? What is the nuclear symbol for aluminum? | Atomic number = number of protons; Mass number = the number of protons and neutrons added together; nuclear symbol for aluminum = 27 Al 13 |
| Smallest particle of an element that retains its identity in a chemical reaction? | Atom |
| Neutral group of atoms joined together by covalent bonds? | Molecule |
| Simplest form of matter that has a unique set of properties; can't be broken down into simpler substance by chemical means? | Element |
| Substance that contains two or more elements chemically combined in a fixed proportion? | Compound |
| Physical blend of two or more substances that are not chemically combined? | Mixture |
| Mixture that is in composition ; components are evenly distributed? | Homogeneous mixture |
| Mixture that is not uniform? | Heterogeneous mixture |
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