NC 8th grade science Review

What is the basic building block of all matter?

• Cells

• Atoms

• Molecules

• Elements

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following is an example of a pure substance?

• Salt water

• Air

• Zinc

• Salad

What type of mixture is salad classified as?

• Homogeneous mixture

• Heterogeneous mixture

• Solution

• Compound

Which statement best describes a compound?

• A compound consists of different types of atoms chemically combined in a fixed ratio.

• A compound is a mixture of two substances that can be separated physically.

• A compound is a single element that cannot be broken down into simpler substances.

• A compound is a homogeneous mixture of two elements.

What is the primary purpose of the Periodic Table?

• To organize chemical reactions

• To predict the properties of elements and show their similarities and differences

• To list all known chemical elements in alphabetical order

• To provide a visual representation of atomic numbers only

what defines a "period" in the periodic table?

• A group of elements with similar properties

• A horizontal row of elements

• A vertical column of elements

• A list of elements with increasing atomic numbers

Which group in the periodic table consists of elements that are all metals except hydrogen?

• Group 1: Alkali metals

• Group 2: Alkaline earth metals

• Group 17: Halogens

• Group 18: Noble gases

What characteristic is common among elements classified as metalloids?

• High melting points and good electrical conductivity

• Low melting points and poor electrical conductivity

• Properties of both metals and nonmetals

• They are all gases at room temperature

Which of the following elements is a metalloid?

• Nitrogen

• Silicon

• Sodium

• Chlorine

What is the primary difference between mass and weight?

• Mass is the amount of matter in an object, while weight is the force due to gravity on an object.

• Mass changes depending on the location, while weight remains constant.

• Weight is the amount of space an object occupies, while mass is how heavy it is.

• Mass can be measured in liters, while weight is measured in grams.

Tags

NGSS.MS-PS2-4