Unit 1 Review Y23-24

Examine the atom of sodium (Na). Sodium has an atomic mass of 23. Select the correct model that represents the nucleus of an atom of sodium.

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NGSS.MS-PS1-1

Water exists as a _____________ at 4 mmHg and 50 °C.

• solid
• liquid
• gas
• plasma

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NGSS.MS-PS1-4

This is a Bohr model showing the electrons of a neutral atom. Which neutral atom is depicted and what evidence supports this claim?

• The atom depicted is beryllium. The Bohr model shows 2 electrons and 4 protons surrounding the nucleus of the atom.

• The atom depicted is boron. The Bohr model shows 5 electrons and because the atom is neutral there are 5 protons making the atom boron.

• The atom depicted is boron. The Bohr model shows that there are 5 protons surrounding the nucleus of the atoms.

• The atom depicted is carbon. The Bohr model shows 6 electrons and because the atom is neutral there are 6 protons making the atom carbon.

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NGSS.MS-PS1-1

The nucleus of an atom is shown. Which of the following statements is true?

• The model is of a oxygen atom with 8 electrons and 8 neutrons.

• The model is of a oxygen atom with 8 protons and 8 neutrons.

• The model is of a neon atom with 10 protons and 10 electrons.

• The model is of a neon atom with 10 protons and 10 neutrons.

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NGSS.MS-PS1-1

At a pressure of 1 atm water begins as a solid, it turns into a liquid at ____ degrees Celsius.

• 0

• 0.01

• 100

• 374

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NGSS.MS-PS1-4

The model represents a neutral silicon atom. Select the response that describes what would happen to the silicon atom if one electron was removed.

• The overall charge of the atom will become positive.

• The overall charge of the atom will become negative.

• The overall charge of the atom will not be affected.

• The atom will become a chlorine atom.

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NGSS.MS-PS1-1

Select the three subatomic particles with the correct location and charge.

• proton- positive- nucleus

• electron- negative- electron cloud

• electron- negative- nucleus

• neutron- neutral- nucleus

Which atom is shown in the model?

• lithium

• oxygen

• beryllium

• boron

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NGSS.MS-PS1-1

How does an atom's overall charge become negative?

• The atom has gained an electron.

• The has lost an electron.

• An atom cannot become negatively charged.

 Examine the model of neutral fluorine. The atomic mass of F is 19 amu. Select two statements that are true.

• Fluorine has 9 protons

• Fluorine has 10 protons

• Fluorine has 9 neutrons

• Fluorine has 10 neutrons

Tags

NGSS.MS-PS1-1