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Physical Science Midterm
Terms in this set (101)
The prefix milli- means
What does KHDM.DCM mean?
Another term for technology:
A lead apron protects you from...
The variable plotted on the horizontal or x-axis is called the
The four fields of science we are studying this year are
Scientific method, physics, chemistry and earth/space
One benefit of the SI system is that it is
Based on multiples of ten
A beaker contains 0.32 L of water. What is the volume of this water in milliliters?
When designing and experiment, the first step is to
State the problem
What do we call a fake medicine given to the control group in a study?
Being unbiased in your research and respecting the welfare of animals and human subjects during experiments
T or F. When boiling acid you should use a stopper to prevent splashing.
The application of scientific knowledge to help people.
A factor that is manipulated in an experiment to change the dependent variable
The prefix kilo- means
The amount of material in an object
SI unit of time
SI unit of length
SI prefix meaning 0.001
Worldwide system of measurement
SI prefix meaning 1,000
Plotted on the vertical or y-axis
SI unit of temp
SI unit of mass
SI prefix meaning 0.01
Derived unit of volume
Three examples of a physical change:
Boiling of water, bursting of a balloon, and crumpling a piece of paper
When a log burns in a fire,
New substances are formed
Another name for a homogeneous mixture
The result of two or more substances being combined so each substance can be separated by physical means
What is NOT a mixture?
T/F. Pure substances are either elements or mixtures.
T/F. The color of a substance is a physical property
T/F. Fog is a compound
T/F. Distillation is a way to separate a mixture using the physical property of boiling point
T/F. The law of conservation of mass states that the mass of all substances before a chemical change equals the mass of all the substances after the change.
T/F. Colloids are mixtures
T/F. The freezing point of water is a chemical change
T/F. When paper burns, that is a chemical change
T/F. A fruit salad is a homogeneous mixture
T/F. If a mixture scatters light and does not settle upon standing, it is a suspension
T/F. A suspension is a homogenous mixture
Using oxygen to separate molten copper sulfide into copper and sulfur dioxide is a physical change
The Tyndall effect
The scattering of light by colloids
All atoms are the same
Composition variable, like salt water
Two or more elements combined, elements lose their properties & composition definite, like water
T/F. Scientists believe that naturally occurring elements are manufactured within mars
T/F. In 1926, scientists developed the Bohr model of the atom that is in use today
T/F. The symbol for fluorine is Fe
T/F. Electron cloud models are used to show how electrons in the outer energy level are bonded when elements combine to form compounds.
T/F. According to present atomic theory, the location of an electron in an atom cannot be pinpointed exactly
T/F. Moving from left to right in a row of the periodic table, metallic properties increase.
T/F. Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons
T/F. Metals are good conductors of heat and electricity
T/F. So far, scientists have confirmed the existence of 6 different quarks
T/F. A very stable electron arrangement in the outer energy level is a characteristic of noble gases.
T/F. The atomic number of an element is determined by it's number of protons
Each inner energy level of an atom has a maximum number of _____ it can hold
Dot diagrams are used to represent what?
Particles of matter that make up protons and neutrons are _____.
A chemical symbol represents the _____ of an element
Horizontal rows of the periodic table are called _____.
Atoms of the same element with different numbers of neutrons are called ______.
A particle that moves around in the nucleus is a ______.
A certain atom has 26 protons, 26 electrons and 30 neutrons. It's mass number is ______.
Elements that are gases, are brittle and are poor conductors at room temp are _____.
T/F. The properties of a compound are the same as the properties of the elements making up the compound
T/F. Because a water molecule has a slight positive charge at one end and a slight negative charge at the other end, it is a non polar molecule
T/F. Particles formed from the covalent bonding of atoms are called ions
T/F. Molecules are neutral
T/F. When an atom gains or loses electrons, the charged particle that results is called a molecule
T/F. An atom is chemically unstable when it's outer energy level contains all the electrons it can hold
T/F. The chlorine atoms in hydrogen chloride have a stronger attraction for the electrons than the hydrogen atoms do. The hydrogen molecule is therefore non polar covalent molecule.
In a chemical formula, the number if each type of atom in the compound is shown by numbers called _______.
The elements that make up a compound and the exact number if atoms of each element in a unit if the compound can be shown in a ______.
A chemical bond that occurs when atoms share electrons is a ______ bond.
The oxidation number of an atom is shown with a ______.
How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?
What kind of chemical bond is formed when an equal exchange of electrons occurs?
What is the total number of atoms in the compound Ca(ClO3)2?
How many hydrogen atoms are present in one molecule of ammonium acetate, NH4C2H3O2?
What is the name if the compound with the formula NaCl?
Why do noble gases NOT form compounds readily?
Their outer energy levels are completely filled with electrons
What is the name of the binary compound made up of lithium and chlorine?
What is the correct formula for magnesium oxide?
The number of electrons an element can lose, gain or share to become stable
What is the sum of all the oxidation numbers in any compound?
A _____ chemical equation has the same number of atoms of each element on each side of the equation
Each substance on the left side of the arrow in a chemical equation is a _____.
If heat must be added to a chemical reaction for the reaction to take place, this reaction is _________.
What type of reaction is shown? NH3+HCl -> NH4Cl
In a chemical equation, the symbol for dissolved in water is ____.
When one element replaces another element in a compound, the reaction is a _____ reaction.
A substance that speeds up a chemical reaction with being permanently changed itself is a _____.
Each substance to the right of the arrow in a chemical equation is a ______.
A chemical reaction in which heat energy is released is ________.
Numbers that precede symbols and formulas in a chemical equation are _______.
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
The masses are equal
A chemical reaction in which two of more substances combine to form another substance is called a ______.
According to the law of conservation of mass, if two hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product?
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