Scientific Theory of Atoms

What evidence supports the conclusion that this model of water molecules represents ice?

• The molecules consist of more than one atom.

• The molecules are uniformly spaced in a fixed pattern.

• The molecules are widely spaced and randomly distributed.

• The molecules are sliding past each other, each one free from the other.

Tags

NGSS.MS-PS1-1

The motion of particles depends on several factors. Which choice describes particles that move the fastest?

• A. A gas at low temperature

• B. A gas at high temperature

• C. A solid at low temperature

• D. A liquid at high temperature

Tags

NGSS.MS-PS1-4

A positively charged particle in an atom is a(n) (a) _____________, and a particle with no charge is a(n) (b)_____________. These two particles form a dense center called the (c) _____________. Each particle that moves around this center is called a(n) (d) _____________.

(a)   ​ ​ (b)   ​ ​ ​ (c)   ​ ​ (d)   ​

• proton
• nucleus
• electron
• neutron

Tags

NGSS.MS-PS1-1

Which incorrect idea in Bohr’s understanding of the atom was replaced by later theories?

• Atoms cannot be divided.

• An atom is mostly empty space.

• In an atom, electrons orbit the nucleus like planets orbit the sun.

• An atom includes electrons embedded in a sphere of positive charge.

Which of the following particles has no electric charge?

• Electron

• Neutron

• Nucleus

• Proton

Matter can change states between solids, liquids, and gases. Which of the following represents a decrease in the energy that the matter in a substance has?

• A substance boils to turn from a liquid into a gas.

• A substance melts to turn from a solid into a liquid.

• A substance absorbs heat and rises in temperature.

• A substance freezes to turn from a liquid into a solid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which statement best identifies which of these models represents a gas?

• Diagram B is a gas, because its particles move more slowly and are farther apart

• Diagram A is a gas, because its particles move more slowly and are closer together

• Diagram B is a gas, because its particles move more quickly and are farther apart

• Diagram A is a gas, because its particles move more quickly and are closer together

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-4

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Tags

NGSS.MS-PS1-1

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

Tags

NGSS.MS-PS1-1

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space. 

Tags

NGSS.MS-PS1-1