Science Milestones

An element is?

• Chemically combined

• Pure substances that can be broken down

• Pure substances that cannot be broken down into simpler substances

• One or more elements chemically combined.

Which picture(s) represents a mixture between two elements?

• A

• B

• C

• A and C

Tags

NGSS.MS-PS1-1

When water sits in the freezer and freezes into ice, it is because the water has...

• gained mass

• gained energy

• lost mass

• lost energy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts
• the motion of particles does not change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is a chemical property of paper?

• Flammable

• White

• Light

• Density

Tags

NGSS.MS-PS1-2

A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?

• The powder DISSOLVED in the water

• The water turned the COLOR yellow

• The bag's TEMPERATURE changed

• The STATE OF MATTER changed

Tags

NGSS.MS-PS1-2

What is the mass number of this atom?

• 1
• 3
• 4
• 7

Tags

NGSS.MS-PS1-1

I am a metal

I am in group 2

I am in period 4

I am…

• S

• He

• S

• Ca

Which of the models best represents CaCO₃?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Why is the following chemical equation not balanced?
H_{2 +} O₂ --> H₂O

• each side of the equation has a different number of oxygen atoms
• each side of the equation has a different number of hydrogen atoms
• each side has the same mass
• the equation is actually balanced

Tags

NGSS.MS-PS1-5