Science STAAR Category 1

Toasting Bread

• Chemical change

• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Breaking a pencil

• Chemical change

• Physical Change

Rusting Nails

• Chemical change

• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Chewing food into smaller pieces

• Chemical change

• Physical Change

Fireworks

• Chemical change

• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Churning food in your stomach

• Chemical change

• Physical Change

Slicing Bread

• Chemical change

• Physical Change

Cutting hair

• Chemical change

• Physical Change

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge.

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of the atom. His discovery led to the understanding that an atom consists mostly of empty space with -

• protons orbiting a dense nucleus made of electrons and neutrons

• electrons orbiting a dense nucleus made of protons and neutrons

• neutrons and protons orbiting a cloud of electrons

• electrons and protons orbiting a cloud of neutrons

Tags

NGSS.HS-PS1-8