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IPC Final Exam
Spring Final Exam
| Question | Answer |
|---|---|
| A one gram of sample of a substance that occupies a liter container completely and evenly throughout would be a | H2O (gas) |
| A student places an object in a glass of water and observes that the object sinks. Then the student dissolves 20 grams of salt in the water and notices that the object now floats. Explain what happened? | Salt water has a greater density than regular unsalted water. By adding salt the buoyancy of the fluid increased enough to support the object. The density of the salt water exceeded the density of the object. |
| Solid | Has a definite shape |
| Solid | Has a definite volume |
| Liquid | Does not have a definite shape |
| Liquid | Has a definite volume |
| Gas | Has no definite shape |
| Gas | Has no definite volume |
| Plasma | Has no definite volume |
| Plasma | Has no definite shape |
| What happens to the viscosity of water as you increase the temperature? | As temperature increases the viscosity decreases. |
| The student found a 2 L container without a label inside a cabinet in the back of a shed. The unknown chemical completely filled the container. What state of matter what the chemical? | Gas |
| The amount of energy needed to change a material from solid to a liquid is called | heat of fusion |
| A student read that by mixing 50 milliliters of water with 50 milliliters of alcohol will produce a solution with a volume less than 100 milliliters. Since science students are curious, what instrument should the student use to see if this was true? | Graduated Cylinder |
| Water is unusual because it ______ when it goes from liquid to a solid state. | Expands |
| Most matter will ______when it is heated. | expands |
| What will happen to a basketball if you played outside in the snow? | The particles in the ball will get closer together and the ball will seem to go flat. |
| As a simple of matter is heated, its particles move faster and further apart. | move faster and further apart |
| The particles that make up a solid move than do the particles that make up a gas. | more slowly |
| Write a question that could only be answered by a scientific investigation. | Does adding salt lower the boiling point of water? (for example: a question requiring a control, and independent and dependant variables.) |
| A fluid’s resistance to flow is called ? | viscosity |
| The most common state of matter in the universe is. | plasma |
| Matter in which atoms are tightly held in place is a . | solid |
| The X axis of the graph represents the __________ variable. | independent |
| Briefly explain what happened to Titanic’s buoyancy to cause it sink. | As the Titanic took on water its mass increased and while its volume remained the same. The density of the Titanic increased beyond the density of the water, exceeding the buoyancy force generated by the water. |
| Matter in which particles are free to move in all directions until they have spread evenly throughout their container is a . | Gas |
| The theoretical point at which all molecular motion stops is called | _absolute zero (-273oC or 1 K) _. |
| The amount of energy needed to change a material from a liquid to a gas is called _. | the heat of vaporization |
| Almost all of the mass of the atom is located | within the nucleus. |
| The atomic number of an element contains the number | of protons and electrons. |
| The atomic number of a Magnesium atom is 12. Its nucleus must contain. | 12 protons. |
| An element has an atomic number of 4 and a mass number of 9. The number of neutrons in the nucleus of an atom of this element is | Mass – protons 9 – 4 = 5 |
| Of the three main subatomic particles, the neutron has an electrical charge of. | neutral |
| If an isotope of Sulfur (S) has 16 protons, 17 neutrons, and 16 electrons, its mass number is | 33. |
| The Greek word for “Atomos” means | indivisible |
| Bohr’s atomic model placed the electrons the | electrons in a fixed orbit like planets. |
| Of the three main particles that make up the atom, the electron has an electrical charge of | negative. |
| The nucleus of atoms contains protons which are positive and neutrons which are neutral. The nucleus therefore has | a positive charge. |
| All atoms are electrically . | neutral |
| The atomic number of hydrogen is 1. Its nucleus must contain . | 1 proton |
| An atom of Carbon (C) whose mass number is 14 differs from an isotope of Carbon whose mass number is 12 in that it has | 2 more neutrons. |
| Dot diagrams are used to represent . | outer level electrons |
| Horizontal rows of the periodic table are called . | periods |
| Elements that are gases, are brittle, and are poor conductors at room temperature | are nonmetals. |
| 4. A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is | 56. |
| Provide at least eight examples of elements which are nonmetals. | C, N, O, F, P, S, Cl, Br, Se, I |
| The periodic table we use today is about . | 100_years old |
| Provide at least five examples of elements which have two valence electrons and name the family. | Be, Mg, Ca, Sr, Ba, Ra, Alkaine Earth Metals |
| What would be the two most reactive elements on the Periodic Table? | Fr and F |
| was the scientist who developed the periodic table and ordered the elements according to their atomic mass? | Demetri Mendeleev |
| How many energy orbitals does K, Potassium, have? | 4 orbitals |
| Moving from left to right in a row (period) of the periodic table, metallic properties | decrease. |
| One proton and one electron are______ to each element as you go across, from left to right, the periodic table. | added |
| A very stable electron arrangement in the outer energy level is characteristic of . | Noble Gases |
| 16.Metals are _______conductors of heat and electricity. | good |
| Elements arranged in vertical columns in the periodic table are called | groups/families. |
| make up most of the periodic table. | Metals |
| List at least six metalloids. | B, Si, As, Se, Sb, Te, Po |
| Draw the electron dot diagram of Mg. : | Mg |
| Draw the electron dot diagram of Si. : : | Si |
| What is the symbol of sodium? | Na, make sure the first letter is upper case and the second letter is lower case. |
| How many valence electrons does sulfur, S, have? | 6 valence electrons |
| Write the symbol of a chlorine ion with a stable arrangement of eight valence electrons? | 35 Cl 1- |
| What is one thing that Hg, mercury, and Mg, magnesium do NOT have in common? | Hg is a liquid and Mg is a solid. |
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spotsville2
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