chem midterm Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Term | Definition |
chemistry | Study of the composition and properties of substances, and the changes those substances can undergo |
scientific method | Orderly and systematic approach to gathering info in order to answer questions about the world |
observation | Fact that is noticed either quantitatively or qualitatively |
hypothesis | Proposition and unproved explanation of observed facts (educated guess) |
experiment | Carefully devised procedure for making observations and gathering data |
conclusion | Judgement or opinion formed as a result of analyzing data |
natural law | Description of a phenomenon that has been repeatedly and uniformly observed in nature |
theory | Logical and time tested explanation of a phenomenon that occurs in the natural world |
variable | Factor being tested In an experiment |
experimental control | Factor that remains constant during an experiment |
metric system | Decimal system of measurement used internationally |
international system of units (SI) | System of units that is an extension of the metric system; includes 7 base units |
base unit | One of seven units used in the SI system |
mass | Quantify of matter in a unit |
derived unit | Unit in the SI system that results in a combination of base units |
volume | Amount of space that an object occupies |
metric prefix | Syllable or group of syllables attached to the beginning of a metric unit in order to make the unit larger or smaller |
precision | Measure of the agreement between the numerical values of two or more measurements that have been using the same method; when the same values result from repeated measurements, the measurements are said to have high ______ |
accepted value | Standard value for a measurement |
accuracy | Indicates how close a measurement is to it's accepted value |
significant digit | Digit in the measurement that is certain, plus one digit that is estimated |
percent error | Relative error as determined by finding the difference between an accepted value an d a measured value, dividing the result by the accepted value and multiplying the quotient by 100 |
density | Mass of an object divided by its volume |
dimensional analysis | Technique for converting between units by using the numerical relationships between the units by using the numerical relationships between the units |
unit equality | Equation that shows the numerical relationships between 2 units |
conversion factor | Fraction having a value of one that is written from a unit equality and is used to change a measurement from one unit to another |
energy | Capacity to do work or transfer heat |
kinetic energy | Energy of motion |
potential energy | Stored energy or energy of position |
joule | Basic unit of energy |
law of conservation of energy | Natural law describing the fact that energy is neither created nor destroyed in any process |
kelvin scale | S.I temperature scale with a zero point of absolute zero |
absolute zero | Theoretically lowest temperature that can be reached -273.15 C or 0 K |
matter | Anything that has mass and volume |
solid | State at which matter holds a definite shape and volume |
liquid | State in which matter does not hold a definite shape but does occupy a definite volume |
gas | State in which matter doesn't have a definite shale or volume |
physical property | Characteristic of a substance that can be observed without altering the identity of the substance |
chemical property | Characteristic of a substance that can't be observed without altering the identity of the substance |
physical change | Process by which a substance undergoes a change that does not alter its identity |
chemical change | Process by which the composition and properties of a substance change, thus altering the identity of the substance. Products a new substance |
Avogadro's number | 6.02 x 10*23 |
element | Substance that can't be separated into a similar substance by a chemical change |
compound | Substance that contains two or more elements chemically combined |
pure substance | Substance made of one kind of material with a unique set of chemical and physical properties |
mixture | Blend of two or more pure substances that are not chemically combined |
heterogeneous mixture | Mixture in which the particles are not uniformly intermingled and that therefore has visibly different parts |
homogeneous mixture | Mixture in which the particles are uniformly intermingled and that therefore doesn't have visibly different parts |
atom | Smallest particle of an element that retains the chemical identity of that element |
law of constant composition | Natural law describing the fact that a given compound always contains the same elements in the same properties |
atomic theory of matter | Proposed by john dalton. States that atoms are neither created nor destroyed in a chemical reaction, all atoms of the same element are identical but not to other atoms |
cathode ray | Stream of electrons emitted by a negatively charged electrode and attracted by a positively charged electrode |
cathode ray tube | Evacuated glass tube in which a stream of electrons emitted by a cathode strikes a fluorescent material causing it to glow |
electron | Negatively charged particle in an atom |
radioactivity | Spontaneous emission of radiation from an atom |
nucleus | Concentrated core of an atom, which contains protons and neutrons |
proton | Positively charged particle in the nucleus of an atom |
neutron | Neutral particle in the core of an atom |
atomic number | Number of protons in the nucleus |
atomic mass unit | Unit by which the mass of an atom or the atomic particle is expressed. |
ion | Atom or group of atoms that has a positively or negative charge because it has lost or gained electrons |
isotope | Atom that has the same number of protons as another atom but has a different number of neutrons |
mass number | Sum of the number of protons and neutrons in the nucleus of an atom |
atomic mass | Weighted average of the masses of the existing isotopes of an element |
nuclear reaction | Process that changes the composition of the nucleus of an atom |
strong nuclear force | Attractive force between the particles in the nucleus. In a stable atom, it overcomes the force of repulsion |
radioactive decay | Spontaneous breakdown of an unstable atomic nucleus |
nuclear equation | Equation that describes the changes that occur during radioactive decay |
Created by:
hannahorth98
Popular Chemistry sets