Which of the following does not represent the meaning of an element?

• A stone made entirely of granite

• a gum ball machine with different sized and colored gum balls

• A package of shredded iceberg lettuce

• A wall made of identical cinder blocks

Tags

NGSS.MS-PS1-1

Based on the chemical equation, how many different elements and compounds are represented?

CH₄ + 2O₂ --> CO₂ + 2H₂O

• Elements - 2; Compounds - 4

• Elements - 4; Compounds - 3

• Elements - 3; Compounds - 3

• Elements - 2; Compounds - 2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What is an ecological model of the relationships that form a network of complex interactions among organisms in a community from producers to decomposers?

• Food web

• Food chain

• Ecosystem

• Population

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

A neutral atom contains the following particles. What is its mass number?

Neutron - 17

Electron - 11

Proton - ?

• 11

• 17

• 28

• 45

Tags

NGSS.MS-PS1-1

Most scientists believe that atomic interactions depend primarily on the arrangement of valence electrons. This is most supported by observations of similar reactions of elements located -

• with similar number of protons

• with similar mass numbers

• in a period on the periodic table

• in a group on the periodic table

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A teacher puts two tablets into a liquid in a cup. The teacher stirs the liquid with the tablet submerged using a stirring rod and it begins to bubble. Which is less dense than the liquid in the cup?

• tablet

• glass

• spoon

• bubbles

Tags

NGSS.MS-PS1-2

What property stays the same during both a physical and a chemical change?

• density

• color

• mass

• particle arrangement

Tags

NGSS.MS-PS1-5

A car is moving down the street as shown. Which force will only affect the speed of the car?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS2-2

Which best described the scenario below?

An airplane taking off traveling at 275 km/hr

• example of speed

• example of velocity

• example of speed and acceleration

• example of velocity and acceleration

Which of the following described a human activity that uses up non-renewable resources?

• plowing topsoil and causing erosion

• cooking on a gas grill

• gathering fire wood for a camp fire

• electricity from a hydroelectric dam

Tags

NGSS.MS-ESS3-4