8th Grade Science Questions

What safety equipment should be worn at all times while working with chemicals in thelaboratory?

• apron

• gloves

• goggles

• lab coat

You observe a dog chasing a ball. Which of the following is a valid hypothesis for this observation?

• If a ball is thrown, then the dog will chase it

• If a ball is thrown, then the dog will be happy

• A dog always chases a ball in motion.

• When you throw the ball the dog is happy.

What is one advantage and one limitation of using a model of an atom like the one pictured below?

• One advantage is the model illustrates the different parts of the atom. One limitation is the model is not to scale.

• One advantage is the model is to scale. One limitation is that the model does not illustrate the different parts of the atom.

• One advantage is that the model materials accurately represent the substances in an atom. One limitation is the size of the model, since atoms cannot be seen by the naked eye.

• One advantage is the model illustrates the relative masses of each part of the atom. One limitation is the model is not to scale.

Jackson is designing an experiment to test the temperature at different times of the day. For each trial, he plans to collect data for 15 minutes. What equipment will he need to implement this experiment?

• Meter stick, spring scale, and test tube

• Timing device, computer, and meter stick

• Thermometer, timing device, and lab journal

• Lab journal, timing device, and psychrometer

Determine if the following chemical equation satisfies the law of conservation of mass: C +S 8 --- 4 CS 2

• It is not balanced. In order to support the law of conservation of mass the equation should read: 4 C + S 8 --- 4 CS 2.

• It is balanced and it supports the law of conservation of mass; matter cannot be created or destroyed.

• It is not balanced. In order to support the law of conservation of mass the equation should read: C + 2 S 8 --- 8 CS 2.

• It is balanced and it supports the law of conservation of mass; energy cannot be created or destroyed

Which substance does the chemical formula Na2 S represent and how many atoms does it contain?

• Sodium sulfide; 2

• Sodium sulfide; 3

• Nitrogen sulfide; 2

• Nitrogen sulfide; 3

Which of the following is a measure of velocity?

• A cheetah is running at a rate of 7 m/s

• A bike is slowing at a rate of 1.5 m/s 2 to the east

• A cat is walking at an angle of 60 degrees

• A dog is running at a rate of 2 m/s to the east

Fred is pushing a desk with a force of 8.9 N to the left, while Kate is pushing the same desk with a force of 6.53 N to the right. What is the net force being applied to the desk and in which direction will it move?

• 15.43 N to the left

• 2.37 N to the left

• 2.37 N to the right

• 15.43 N to the right

Which season is each hemisphere experiencing in the picture below?

• The northern hemisphere is experiencing spring while the southern hemisphere is experiencing fall.

• The northern hemisphere is experiencing fall while the southern hemisphere is experiencing spring.

• The northern hemisphere is experiencing winter while the southern hemisphere is experiencing summer.

• The northern hemisphere is experiencing summer while the southern hemisphere is experiencing winter.

The Hertzsprung-Russell diagram below show the brightness and temperature of different stars. Based on the information in the diagram, what can you conclude about the White Dwarfs?

• They are hotter than the Sun, but not as bright.

• They are cooler than the Sun, and not as bright.

• They are hotter and brighter than the Sun.

• They are cooler and brighter than the Sun.