8th.Grade.Midterm.Review.2022

Which of the following best describes atoms

• Positively charged particles

• The smallest unit of an element

• Combinations of elements

• Particles too small to have mass

Which of the following lists the two particles found together inside the nucleus of an atom?

• Photons and ions

• Neutrons and electrons

• Protons and neutrons

• Electrons and protons

The provided diagram of an atom shows two regions, the nucleus (1) and the area surrounding the nucleus (2). How are the protons, neutrons, and electrons that make up an atom distributed?

• Protons and electrons in region 1, neutrons orbiting in region 2

• Electrons and neutrons in region 1, protons orbiting in region 2

• Protons in region 1, neutrons and electrons orbiting in region 2

• Protons and neutrons in region 1, electrons orbiting in region 2

The illustration of a candle provided here includes some of the processes that happen when the candle burns. Which of the following processes is evidence of a physical change

• Heat given off

• Light given off

• Wick becomes black

• Wax becomes liquid

Monica and Andre are investigating the differences between physical and chemical changes. They list their observations in the table.

• Metal Rusts

• An aluminum can is crushed

• Sugar is burned

• Milk is left out and an odor is produced

Alexa is writing a paper comparing elements and compounds found in living and nonliving things. Which of the following could Alexa use to correctly describe the relationship between elements and compounds.

• There is a finite number of elements that can be used to create a multitude of compounds

• Two compounds are required to make one element in natural systems

• Compounds combine in different ways to create many variations of elements

• Every elements can be broken down into an infinite number of compounds

Which of the following is the best description of an element

• A pair of atoms that have different abilities when joined together

• A substance that cannot be broken down into simpler substances

• A material that has a specific shape at a specific temperature

• A naturally occurring mineral made of more than one substance

A substance is anything with specific composition and properties. The chart provided lists some substances and their symbols. How many substances in the table are compounds?

• 1

• 2

• 3

• 4

Wyatt wants to determine the best way to keep water warm the longest. He boils water and places it in four different containers. After 15 minutes, he records the temperatures in each container. Based on the data, Wyatt can conclude that which container was the best insulator of heat?

• Container 1

• Container 2

• Container 3

• Container 4

Based on the data for the four samples, determine which of the following substances has the greatest density.

• Sample 1:

  Volume= 48 cm3,

  mass= 100 g

• Sample 2: Volume= 15 cm3,

  mass = 30 g

• Sample 3:

  volume= 3 cm3,

  mass= 12 g

• Sample 4:

  Volume= 20 cm3,

  Mass= 66 g