Matter that has a definite composition; also known as a chemical.

A measure that reflects the amount of matter.

A measure of an amount of matter and also the effect of Earth's gravitational pull on that matter.

A visual, verbal, and/or mathematical explanation of data collected from many experiments.

A systematic approach used in scientific study; an organized process used by scientists to do research and to verify the work of others.

Information describing color, odor, shape, or some other physical characteristic.

Numerical information describing how much, how little, how big, how tall, or how fast.

A tentative, testable statement or prediction about what has been observed.

A set of controlled observations that test a hypothesis.

In an experiment, the variable that the experimenter plans to change.

In an experiment, the variable whose value depends on the independent variable.

In an experiment, the standard that is used for comparison.

A judgement based on the information obtained.

An explanation supported by many experiments; is still subject to new experimental data, can be modified, and is considered valid if it can be used to make predictions that are proven true.

Describes a relationship in nature that is supported by many experiments.

A type of scientific investigation that seeks to gain knowledge for the sake of knowledge itself.

A type of scientific investigation that is undertaken to solve a specific problem.

A defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other units.

The SI base unit for time.

The SI base unit for length.

The SI base unit for mass.

The SI base unit for temperature.

A unit defined by a combination of base units.

The metric unit for volume equal to one cubic decimeter.

The amount of mass per unit volume; a physical property.

Expresses any number as a number between 1 and 10 (known as coefficient) multiplied by 10 raised to a power (known as an exponent).

A systematic approach to problem solving that uses conversion factors to move from one unit to another.

A ratio of equivalent values used to express the same quantity in different units.

Refers to how close a measured value is to an accepted value.

Refers to how close a series of measurements are to one another.

The difference between an experimental value and an accepted value.

The ratio of an error to an accepted value.

The number of all known digits reported in measurements plus one estimated digit.

The physical forms in which all matter naturally exists on Earth.

A form of matter that has its own definite shape and volume, is incompressible, and expands only when slightly heated.

A form of matter that flows, has constant volume, and takes the shape of its container.

A form of matter that flows to conform to the shape of its container, fills the container's entire volume, and is easily compressed.

Gaseous state of a substance that is a liquid or a solid at room temperature.

A characteristic of matter that can be observed or measured without changing the sample's composition- for example, density, color, taste, hardness, and melting point.

The ability or inability of a substance to combine with or change into one or more new substances.

A physical property, such as mass, length, and volume, that is dependent upon the amount of substance present.

A physical property that remains the same no matter how much of a substance is present.

A type of change that alters the physical properties of a substance but does not change its composition.

A process involving one or more substances changing into new substances; also called a chemical reaction.

A transition of matter from one state to another.

States that mass is neither created nor destroyed during a chemical reaction but is conserved.

Matter that has a definite composition; also known as a chemical.

A physical blend of two or more pure substances in any proportion in which each substance retains its individual properties; can be separated by physical means.

One that does not have a uniform composition and in which the individual substances remain distinct.

One that has a uniform composition throughout and always has a single phase; also called a solution.

A uniform mixture that can contain solids, liquids, or gases; also called a homogenous mixture.

A technique that uses a porous barrier to separate a solid from a liquid.

A technique that can be used to physically separate most homogeneous mixtures based on the differences in the boiling points of the substances.

A separation technique that produces pure solid particles of a substance from a solution that contains the dissolved substance.

The energy-requiring process by which a solid changes directly to a gas without first becoming a liquid.

A technique that is used to separate the components of a mixture based on the tendency of each component to travel or be drawn across the surface of another material.

States that matter is composed of extremely small particles called atoms; atoms are invisible and indestructible.

The smallest particle of an element that retains all the properties of that element; is electrically neutral, spherically shaped.

Radiation that originates from the cathode and travels to the anode of the a cathode-ray tube.

A negatively charged, fast-moving particle with an extremely small mass that is found in all forms of matter and moves through empty space surrounding and atom's nucleus.

The extremely small, positively charged, dense center of an atom that contains positively charged protons and neutral neutrons.

A subatomic particle in an atom's nucleus that has a positive charge of 1+.

A neutral, subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton.

The number of protons in an atom.

The weighted average mass of the isotopes of that element.

Atoms of the same element with different numbers of neutrons.

The number after an element's name, representing the sum of its protons and neutrons.

One-twelfth the mass of a carbon-12 atom.

The process in which some substances spontaneously emit radiation.

The rays and particles- alpha and beta particles and gamma rays- that are emitted by radioactive materials.

A spontaneous process in which unstable nuclei lose energy by emitting radiation.

A reaction that involves a change in the nucleus of an atom.

A type of equation that shows the atomic number and mass number of the particles involved.

Radiation that is deflected toward a negatively charged plate when radiation from a radioactive source is directed between two electrically charged plates.

Radiation that is deflected toward a positively charged plate when radiation from a radioactive source is directed between two electrically charged plates.

A particle with two protons and two neutrons, with a charge of 2+.

A high-speed electron with a 1- charge that is emitted during radioactive decay.

High-energy radiation that has no electrical charge and no mass; it is not deflected by electric or magnetic fields.

You can see the macroscopic with your naked eyes.

What do you need in order to see the microscopic world?

red

tall

50 kilograms

100 mph

A researcher works on ways to improve crop production .

A researcher analyzes the composition of Neptune's atmosphere.

Which of the following is NOT one of the consequences of climate change we discussed?

Which of the following is incorrect of the SI Units?

100 m= ______km

20 °C= ______ K

225mm= ______cm

Which of the following is not a physical property?

Which of the following is NOT a chemical change?

Which of the following is a homogeneous mixture?

Which of the following is a heterogenous mixture?

__________ are the elements or materials that go into the reaction.

________ are the elements or materials that come out of the reaction.

What did Rutherford discover?

What do you NOT need to calculate atomic mass?