Semester One Exam 7th Grade Honors

If you do not understand a direction or part of a laboratory procedure, you should

• figure it out as you do the lab

• try several methods until something works

• ask the teacher before proceeding

• skip it and go on to the next part

The following activity is permitted in the laboratory:

• chewing gum

• eating

• drinking

• None of the above

Before you leave the science room, you should

• clean your work area and equipment

• return all equipment to the proper storage area

• wash your hands with soap and water

• All of the above

You have been injured in the laboratory (cut, burned, etc.). First you should

• visit the school nurse after class

• see a doctor after school

• tell the teacher at once

• apply first aid yourself

Horseplay, practical jokes, or pranks in the classroom are

• always against the rules

• okay

• not dangerous

• okay if you are working alone

This photograph shows all three states of water. Water vapor exists as a gas in the air above the water and ice. Water exists as a solid in the ice on the lake. Water exists as a liquid in the lake. Which form of water has the greatest density? Select ONE correct answer.

• A

• B

• C

A student used a pH meter to find the pH of some common household materials and recorded the observations in a table. Identify by checking the appropriate boxes which materials are acids.

• Egg white, pH = 7.8: Acid, Base

• Soapy water, pH = 11.1: Acid, Base

• Rain Water, pH = 5.6: Acid, Base

• Lemon Juice, pH = 2.2: Acid, Base

• Coffee, pH = 5.0: Acid, Base

Tags

NGSS.MS-PS1-2

A suspension is a mixture of a solid and a liquid. The solid can be seen evenly throughout the liquid. After a long period of time, the solid will settle to the bottom of the mixture. Is a suspension a compound?

• No it is not, because the solid can only be separated through chemical processes.

• Yes it is, because the solid can only be separated through chemical processes.

• No it is not, because the solid can be separated through physical processes.

• Yes it is, because the solid can be separated through physical processes.

The diagrams show the change in the volume of water in mL in a graduated cylinder after the addition of objects X, Y, then Z. If each object has a mass of 3 g, which list correctly orders them from greatest density to least density?

• A. X, Z, Y

• B. X, Y, Z

• C. Y, Z, X

• D. Z, X, Y

Tags

NGSS.MS-PS1-2

Most metals such as nickel and tin tend to melt at —

• F. low temperatures.

• G. temperatures close to room temperature.

• H. temperatures below zero degrees Celsius.

• J. high temperatures

Tags

NGSS.MS-PS1-4