MS PS1-1 Review

Which of the following best describes two atoms of oxygen that are chemically bonded to each other?

• molecule

• compound

• solution

• mixture

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NGSS.MS-PS1-1

An atom with an equal ratio of protons to electrons gains an electron. Upon gaining an electron, the atom will

• lose a proton.

• gain a neutron.

• maintain its neutral state.

• become negatively charged.

The model shows a molecule of silk made by a spider. What does each sphere in the molecular model represent?

• an atom

• a compound

• a nucleus

• an ion

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NGSS.MS-PS1-1

The image shows two processes. Which statement best compares the processes?

• They both form a new atom.

• They both form a new molecule.

• Process 1 forms a new molecule, and Process 2 forms a new atom.

• Process 1 forms a new atom, and Process 2 forms a new molecule.

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NGSS.MS-PS1-2

A student took notes by drawing diagrams during science class. Which of these sets of labels would correctly identify the diagrams in the pictures above?

• Picture 1: animal cell, Picture 2: plant cell

• Picture 1: mixture, Picture 2: solution

• Picture 1: compound, Picture 2: element

• Picture 1: atom, Picture 2: molecule

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The chemical formula for water is H₂O. What does the formula show about each element in the compound?

• the number of valence electrons

• the charge of the compound

• the mass of protons in each atom

• the number of atoms of each element

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NGSS.MS-PS1-1

Two atoms of oxygen combine to form pure oxygen gas. What is the electrical charge of the O₂ molecules?

• positive

• negative

• neutral

• variable

A carbon atom has six protons, six neutrons, and six electrons. How would a Bohr model show the protons in a carbon atom?

• The particles are evenly distributed through the mass of carbon.

• Electrons form a cloud around a nucleus of protons and neutrons.

• Neutrons revolve around a nucleus of electrons and protons.

• Electrons move in fixed orbits around a nucleus of protons and neutrons.

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NGSS.MS-PS1-1

Structural differences between different chemicals can be represented in models of the particles. Which drawing best represents a compound?

• 
• 
• 
• 

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NGSS.MS-PS1-1

How many atoms are in one formula unit of magnesium hydroxide, Mg(OH)₂?

• 6

• 5

• 4

• 3

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NGSS.MS-PS1-1