The diagram shows the arrangement of electrons in a neon atom. How many protons are present in this atom's nucleus?

• 10

• 8

• 2

• There is not enough information to answer this question.

Tags

NGSS.MS-PS1-1

How many of each atom are in the compound above?

• 1 magnesium atom, 2 iron atoms, and 4 oxygen atoms

• 3 magnesium atoms, 2 iron atoms, and 4 oxygen atoms

• 6 magnesium atoms, 6 iron atoms, and 12 oxygen atoms

• 3 magnesium atoms, 6 iron atoms, and 12 oxygen atoms

Tags

NGSS.MS-PS1-1

The table shows the number of neutrons, protons, and electrons for two atoms. How are the two atoms alike?

• They have the same charge.

• They have the same mass number.

• They have the same atomic number

• They are atoms of the same element.

Tags

NGSS.MS-PS1-1

Elements with seven valence electrons —

• are highly reactive

• are highly stable

• have a high mass

• have a low mass

Which of the following best defines science?

• A collection of unchangeable facts about the natural world

• The study of the natural world through observation, identification, description, experimental investigation, and theoretical explanations

• A belief system based on assumptions about the natural world

• A method for proving theories beyond doubt

Tags

DOK Level 1: Recall

What is the principle of conservation of mass in a chemical reaction?

• Mass can neither be created nor destroyed.

• Mass of the reactants is always more than the mass of the products.

• Mass of the products is always more than the mass of the reactants.

• Mass can be created during the reaction.

Tags

NGSS.MS-PS1-5

What happens to energy as it moves up the trophic levels in an ecosystem?

• It increases as it moves up the trophic levels.

• It remains constant throughout the trophic levels.

• It decreases as it moves up the trophic levels.

• It is completely recycled at each trophic level.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following is a property that can be used to identify a substance?

• Color

• Smell

• Density

• All of the above

Which of the following best describes energy transfer in a food web?

• Energy is transferred from primary consumers to producers.

• Energy is transferred from decomposers directly to primary consumers.

• Energy flows from producers to consumers.

• Energy is equally distributed among all organisms in an ecosystem.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the role of evidence in modifying scientific theories?

• Evidence is rarely considered when modifying theories.

• Evidence can refute or support theories, leading to modifications.

• Theories are modified first, then evidence is found to support the changes.

• Evidence is only used to confirm existing theories, not modify them.

Tags

DOK Level 3: Strategic Thinking