Chapter 2 : Science, Matter, Energy & Systems

A scientific law is a

Ions are _____.

The number of _____ in an atom determines which element it is.

The acidity of a solution is based on the comparative amounts of hydrogen ions and _____ ions.

Scientists read each other's work only after it is published.

Combinations of two or more different elements held together in fixed proportions are known as _____.

A possible and testable answer to a scientific question or explanation of what scientists observe in nature is

To be considered _____, a theory must be supported by multiple sources of evidence.

Experiments are designed so that the control group differs from the experimental group by one key variable.

A scientific hypothesis is a scientific theory that has been thoroughly tested.

An acidic solution has a pH greater than 7.

A Peer review is when Scientist's review each others work .

Science is a broad field of study focused on discovering how nature works

Matter can exist in three physical states—solid, liquid, and compound.

A Physical or mathematical representation of a structure or system is a model.

Whenever matter undergoes a physical or chemical change, no atoms are created or destroyed.

Experiments are designed so that the control group differs from the experimental group by one key variable.

After scientists analyze data from an experiment, they can propose a(n) _____ that they can test.

If you drop a book from your hand to the floor, some of the _____ energy of the book will be converted to ____ energy.

Energy associated with motion is called potential energy.