Practice STAAR

A class of third-grade students was trying to identify some unknown minerals. They tested each mineral to determine its hardness on a scale from 1 to 10. The data they collected is shown above.

The class wants to separate the minerals into three groups based on their hardness. Which chart accurately shows the data the class collected?

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• 
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Mr. Line fills a bottle half-full of vinegar. He places baking soda in a paper napkin tied to a rubber stopper. When he shakes the bottle, the vinegar reacts with the baking soda producing bubbles. When the bubbles fill the bottle, the stopper is forced off the top.

Why does this happen?

• The gas created in the reaction takes up more room than the space in the bottle.

• The temperature of the bottle changes which makes the stopper become too loose.

• The string, napkin, and stopper make the reaction happen too fast.

• There is too much vinegar left in the bottle.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Models are great ways of representing complex ideas with a simple representation. An example of this is the model below of the layers of the Earth.

In the diagram, how is the heat being transferred?

• Convection

• Conduction

• Radiation

• Specific

Tags

NGSS.MS-ESS2-1

Plate tectonics is the theory that says the outer layer of the Earth is divided into "plates" that move around across the earth's surface relative to each other. Many observations and experiments have gone into this theory. Which of the following scientists is credited with foundations of the Plate Tectonic Theory?

• Alfred Wegener

• Galileo Galilei

• Carolus Linnaeus

• Antony von Leeuwenhoek

Tags

NGSS.MS-ESS2-3

Which is the density of the rock?

• .04 g/mL

• .05 g/mL

• 2.0 g/mL

• 2.5 g/mL

Tags

NGSS.MS-PS1-2

What is the smallest part of an element?

• compound

• atom

• molecule

• solution

Elizabeth is making a circuit for class. She is trying to decide what type of material to use to make the wires so they can conduct electricity most efficiently.

What type of material should the wires be made out of so that they best conduct electricity?

• Nonmetal

• Metalloid

• Metal

• Ceramic

Tags

NGSS.MS-ETS1-1

Marcie fills a graduated cylinder with 15.OmL of water. Paul finds the mass of a marble to be 2.21g, then drops the marble into the graduated cylinder. If the meniscus on the cylinder is now at 16.3mL, what is the density of the marble?

• 1.7

• 33.15

• 14.09

• 17.21

The diagram above shows changes in a desert rock formation over time. The changes in the rock formation occurred as rock was worn away by wind-blown dust. Which type of energy is MOST responsible for wearing away the rock?

• kinetic energy

• radiant energy

• potential energy

• chemical energy

Tags

NGSS.MS-ESS2-2

The archer above shoots an arrow toward a target. Which object has the GREATEST kinetic energy?

• archer

• bow

• arrow

• target

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5