Which best describes an advantage of the model?

• The model shows that water exists as a solid, liquid, and gas.

• The model shows observable properties of water.

• The model shows how water interacts with other substances.

• The model shows parts of the molecule that are too small to

  see.

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-1

The water molecule is a ​ (a)   because it is made up of ​ (b)  

• compound
• two elements
• atom
• three atoms

Tags

NGSS.MS-PS1-1

Lisa changes her model by adding another circle to represent

oxygen as part of the molecule. How does this change what the

model shows?

• The model now shows that water can change into new

  substances.

• The model now shows a larger water molecule.

• The model now shows a different kind of molecule.

• The model now shows that water molecules can have two

  oxygen atoms.

Tags

NGSS.MS-PS1-1

Which model would best demonstrate evidence of matter that

cannot be seen?

• Blow up a balloon with helium gas.

• Burn a piece of paper to make ashes.

• Feel the heat given off by a lightbulb.

• Add water to a mixture of sand and gravel.

Tags

NGSS.MS-PS1-5

Jin knows that there is water in the air in the form of a gas. It is

called water vapor. He also knows that when water vapor cools, it

turns from a gas into a liquid. He decides to use a model to show

that there is water in the air that people cannot see. He places a

glass of cold ice water on a picnic table on a warm day. Jin lets

the glass sit on the table for several minutes.

• The ice in the glass will melt.

• Water droplets will form on the outside of the glass.

• Gas from the surrounding air will enter the glass.

• The water in the glass will get warmer.

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A hand lens, or magnifying glass, magnifies objects. Karen uses a

hand lens to observe a rock. Which observation could Karen

make using the hand lens?

• The rock is made of atoms.

• The rock contains different kinds of molecules.

• The rock is made of small grains of sand.

• The rock weighs about 2 kilograms.

What is a particle that is the smallest and most basic part of an element called?

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

The ​ (a)   is the idea that everything is made up of small particles.

• atomic theory
• atom
• molecular structure
• quantum mechanics
• cell theory

Tags

NGSS.MS-PS1-1

Matter made of two or more elements, such as water, oxygen, and salt is called a ...

• compound

• matter

• molecule

• atomic theory

Tags

NGSS.MS-PS1-1

The smallest particle of a compound that has the properties of the compound is called a...

• atom

• atomic theory

• molecule

• compound

Tags

NGSS.MS-PS1-1