Reactions and Atoms

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

Tags

NGSS.MS-PS1-5

A chemical change is different than a physical change because in a chemical change

• Chemicals are used
• Molecules do not physically touch
• A new substance is formed and in a physical change no new substance is formed
• The change can be seen but in a physical change it cannot

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement is not a description of a chemical reaction?

• A solid is dropped into a beaker of liquid and a gas is released.
• Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
• A solid is dropped into a beaker of liquid and an explosion occurs.
• A liquid is heated in the sun and half of it evaporates.

Tags

NGSS.MS-PS1-2

Which of the following is NOT a sign of a chemical reaction? 

• Color changes
• Cutting into fourths
• Light is produced
• Gas is formed

Tags

NGSS.MS-PS1-2

Which two subatomic particles are found in the NUCLEUS of at atom?

• protons & nuetrons
• protons & electrons
• neutrons & electrons
• electrons & protons

Tags

NGSS.MS-PS1-1

The subatomic particle with a neutral charge is:

• protons
• electrons
• neutrons
• cloud

What type of subatomic particles are found in the cloud?

• neutrons
• electrons
• protons
• reactions

Tags

NGSS.MS-PS1-1

If an atom has 24 protons and 24 electrons, what is the atomic number of this element?

• 24
• 48
• 0
• 42

Tags

NGSS.MS-PS1-1

How many protons does this element have?

• 40
• 21
• 20
• 41

Tags

NGSS.MS-PS1-1

The number of protons is equal to 

• the atomic number
• the number of neutrons
• the energy levels
• the periodic table groups

Tags

NGSS.HS-PS1-2