A change of matter from one form to another that DOES NOT result in a new substance.

A change in matter that DOES result in a new substance.

The forms in which matter exists, primarily solids, liquids, and gasses.

A measure in the amount of heat energy in something.

The state of matter that DOES have a definite shape and DOES have a definite volume.

The amount of space that matter takes up.

A physical property that measures the amount of mass per unit of volume.

The changing of water from liquid to a gas (water vapor).

A physical change in matter from a gas (water vapor) to a liquid.

The state of matter that DOES NOT have a definite shape but DOES have a definite volume.

The state of matter that DOES NOT have a definite shape and DOES NOT have a definite volume.

Measurable characteristics that describe the physical state such as mass, hardness, size, etc.

A physical property that describes how easily the smooth surface of a mineral can be scratched.

A physical property that describes the appearance of the surface of a mineral dependent upon its reflecting qualities.

A process in which one or more substances are converted to one or more different substances.

A physical property that describes how rough or smooth something feels.

The process of enlarging the size of something, as an optical image.

A physical property that describes when something is attracted to a magnet.

A combination of two or more substances where each keeps its own properties and both can be easily separated.

A liquid substance composed of the same type of atom throughout.

A scientific theory of the nature of matter which states that matter is composed of discrete units called atoms.

The smallest unit of matter. The basic building block for all matter in the universe.

A pure substance composed of the same type of atom throughout.

A group of two or more atoms held together by chemical bonds.

A pure substance formed by two or more different types of elements. All molecules are not compounds but all compounds are molecules.

The positively-charged region in the center of an atom.

A positively-charged subatomic particle of the nucleus of an atom.

A subatomic particle of the nucleus of an atom that is without charge.

A negatively-charged subatomic particle that orbits the atomic nucleus.

Interactions between substances can produce chemical or physical changes.

Which of the following describes a chemical change? Select all.

A student wants to remove the salt from a mixture of sand and salt in order to get only pure sand.

He adds water to the mixture. Why is this step helpful?

The ripening of an apple is an example of a chemical change.

Which will ripen faster after ten days: an apple at room temperature or an apple in a refrigerator?

James is making lemonade. He adds sugar to some lemon juice in water. The sugar starts to dissolve. What can James do to speed up the dissolving process?