Science DBA Review

A student is using colored beads to make a model of aluminum sulfate, Al₂(SO₄)₃. Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads.

What combination of beads should the student use for the model?

• 2 blue, 3 yellow, and 12 green

• 6 blue, 3 yellow, and 7 green

• 2 blue, 1 yellow, and 4 green

• 6 blue, 12 yellow, and 12 green

Tags

NGSS.MS-PS1-1

The data table provided contains information about how temperature affects the state of matter for three substances. 

 

• the atoms in matter change shape when heated.

• temperature chemically changes matter. 

• the atoms in matter slow when heated.

• temperature physically changes matter.

Tags

NGSS.MS-PS1-4

1. How many atoms of oxygen are in the chemical formula below?  

C6H12O6

• 12

• 18

• 6

• 24

Tags

NGSS.MS-PS1-1

What is a chemical formula?

• a mathematical formula that is used to describe a substance

• an equation to determine the types of atoms in a substance.

• an idea that has a lot of evidence that many scientist have gathered over a long time.

• letters and numbers showing the types and numbers of atoms that repeat to make up a substance

Tags

NGSS.MS-PS1-5

1. The names and chemical formulas for four substances are shown in the chart. 

1. Which substance listed in the chart is made up of the most atoms?

   
   

• 1. Carbonic acid

• 1. Nitric acid

• 1. Phosphoric acid

• Sulfuric acid

Tags

NGSS.MS-PS1-1

1. A student mixes sugar, water, and lemon juice. Which of the following best describes the changes that occur?

• 1. It is a chemical change because sugar, water, and lemon juice are chemicals.

• 1. It is a physical change because no new substance is formed. It is still lemon juice, sugar, and water.

• 1. It is a chemical change because things are mixed together.

• 1. It is a physical change because sugar, water, and lemon juice are all individual things.

Tags

NGSS.MS-PS1-2

Which of the following is NOT a way humans positively impact surface water?

• After humans use water, it flows to a surface water holding area to either be treated for reuse or cleaned before reaching a lake, pond, or river.

• Farmers create buffers of plants and trees to filter water before it enters surface water.

• Builders use permeable concrete that will reduce runoff to surface water.

• Gardeners sweep grass clippings from mowed lawns into the sewer drain.

Tags

NGSS.MS-LS2-5

15 g of four different solutes are added to four beakers, each containing 30 mL of water. The solute remaining after 2 minutes of agitation is removed from each of the beakers and weighed. Which of the following solutions has the highest concentration?

• Substance D

• Substance B

• Substance A

• Substance C

Tags

NGSS.MS-PS1-2

The model shows an area near a lake. Community leaders are planning new laws to help protect the lake from pollution. One proposed law will make it illegal to dump trash on the shore of the lake, but the law still allows trash to be placed in the area labeled “Flow-through wetland.”

Which statement about the proposed law is supported by the model?

• The proposed law will not protect the lake because animals that live in or near the lake will add pollution to the lake.

• The proposed law will protect the lake because plant roots between the wetland and the lake will stop pollution from entering the lake.

• The proposed law will not protect the lake because groundwater will carry pollution from the wetland directly into the lake.

• The proposed law will protect the lake because the high elevation of the water table will block pollution from entering the lake.

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-5

NGSS.MS-LS2-4

Humans contribute to the chemical pollution of oceans in many ways. Which of the following is a method in which humans contribute to the chemical pollution of our oceans?

Select THREE correct answers.

• Collecting rainwater to reuse as irrigation for farms

• Spraying fertilizer on yards, public spaces, and agricultural areas

• Boat traffic interfering with the communication methods of large aquatic mammals

• Leaking oil, gasoline, and other chemicals from cars and boats

• Runoff from manufacturing plants located near waterway

Tags

NGSS.MS-ESS3-4

NGSS.MS-ESS3-3