Ohio OST Science Review

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

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

In the diagram, the arrows labeled III point to the atom's ______________.

• Protons

• Neutrons

• Nucleus

• Electrons

Tags

NGSS.MS-PS1-1

Which of the following best describes the flow of energy in an ecosystem?

• It flows from decomposers to producers to consumers

• It is recycled among producers only

• It flows from producers to consumers to decomposers

• It flows directly from the sun to all living organisms equally

Tags

NGSS.MS-LS2-3

In which state of matter are the molecules moving the fastest?

Answer explanation

Molecules in a solid vibrate and move slowly compared to the molecules in a liquid or gas.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

What does an energy pyramid show?

• The amount of energy consumed by humans

• The number of animals in an ecosystem

• The flow of energy from one trophic level to the next in an ecosystem

• The physical structure of a forest

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The state of matter found in lightning
(a)  

• plasma

• solid

• liquid

• gas

Answer explanation

Plasma is the fourth state of matter and is made of gas. Atoms are the smallest pieces of all matter. When energy is added to a gas, its atoms get very excited and become ions when the outer electrons of atoms break off, creating plasma

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

• The element is sodium, and it is highly reactive

• The element is fluorine, and it is highly reactive

• The element is sodium, and it is not very reactive

• The element is fluorine, and it is not very reactive

Which of these elements would have properties most similar to arsenic (As)?

Use the periodic table and your notes slides.

• Silicon (Si)

• Selenium (Se)

• Tin (Sn)

• Phosphorus (P)