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IPC Final Exam

Spring Final Exam

QuestionAnswer
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.
Created by: spotsville2