8th Grade Science STAAR Review- Category 1

Atoms are the basic building blocks of matter. What are atoms composed of?

• Protons, Neutrons, and Electrons

• Molecules

• Cells

• Compounds

Tags

NGSS.MS-PS1-1

What is the Arrangement of the Periodic Table.

• The elements are arranged by increasing atomic number.

• The elements are arranged by decreasing atomic number.

• The elements are arranged alphabetically.

• The elements are arranged by atomic mass.

Chemical formulas are used to represent the composition of molecules. Which of the following best describes a chemical formula?

• A representation of the elements in a compound and their ratios

• A detailed description of the chemical reactions

• A list of all possible compounds

• A summary of the physical properties of a substance

Explain Chemical Reactions & Equations.

• Chemical reactions involve the transformation of substances.

• Chemical reactions do not involve energy changes.

• Chemical reactions are not represented by equations.

• Chemical reactions do not follow the law of conservation of mass.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is Photosynthesis?

• Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.

• Photosynthesis is the process of converting chemical energy into mechanical energy.

• Photosynthesis is the process of breaking down food to release energy.

• Photosynthesis is the process of absorbing nutrients from the soil.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

Energy flow through ecosystems is described as:

• A linear flow from producers to consumers

• A cyclic flow between producers and consumers

• A random flow among all organisms

• A flow that starts with consumers

Tags

NGSS.MS-LS2-3

Explain Physical & Chemical Changes in Matter:

• Physical changes involve a change in state or appearance, while chemical changes result in new substances.

• Physical changes result in new substances, while chemical changes involve a change in state or appearance.

• Both physical and chemical changes result in new substances.

• Neither physical nor chemical changes result in new substances.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Elements and compounds are classified according to 6.5A. Which of the following best describes the difference between elements and compounds?

• Elements are pure substances made of only one type of atom, while compounds are made of two or more types of atoms chemically combined.

• Elements are mixtures of different substances, while compounds are pure substances.

• Elements can be broken down into simpler substances, while compounds cannot.

• Elements and compounds are both made of the same type of atoms.

Which of the following best describes a property of metalloids?

• They are good conductors of electricity.

• They are malleable and ductile.

• They have properties of both metals and non-metals.

• They are poor conductors of heat.

What is the mass of an atom with five protons, six neutrons, and five electrons? (remember M=A-N)

• 5 amu

• 11 amu

• 10 amu

• 16 amu