Unit 3 Test Review

What are the 5 Postulates of Dalton’s Atomic Theory? Draw Dalton’s Model of the Atom. a. All matter is made up of _​ (a)   _.

b. Atoms of an element are _​ ​ (b)   .

c. Atoms are​ (c)  

. d. To form compounds, elements combine in ​ (d)   - Law of Definite Proportions.

e. In chemical reactions, atoms are ​ (e)   ____.

​

• atoms
• whole-number ratios
• identical in size
• indivisible
• combined, separated, or rearranged

Tags

NGSS.HS-PS1-7

Who discovered the electron and with what experiment?

• Albert Einstein with the Photoelectric Effect

• Niels Bohr with the Bohr Model

• J.J. Thomson with the Cathode Ray Tube Experiment

• Ernest Rutherford with the Gold Foil Experiment

Which model of the atom is represented by a sphere of positive charge with electrons embedded in it?

• Rutherford's Model

• Bohr's Model

• Thomson's Model

• Quantum Mechanical Model

Tags

NGSS.MS-PS1-1

What is the name of Thomson’s model?

• Plum Pudding Model

• Rutherford Model

• Bohr Model

• Quantum Model

Which of Dalton’s postulates did the discovery conflict with?

• Atoms are indivisible and indestructible.

• Atoms of a given element are identical in mass and properties.

• Compounds are formed by a combination of two or more different kinds of atoms.

• A chemical reaction is a rearrangement of atoms.

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NGSS.MS-PS1-5

The Rutherford Gold Foil Experiment demonstrated that the atom has a small, dense nucleus. Which of the following observations led to this conclusion?

• Most alpha particles passed through the foil without deflection.

• Some alpha particles were deflected at large angles.

• Alpha particles were absorbed by the foil.

• Alpha particles emitted light when passing through the foil.

Rutherford discovered that atoms contain a ____________________ & are mostly empty ________________.

• nucleus and space

• core and void

• center and gap

• hub and vacuum

Which model of the atom includes a nucleus with electrons orbiting around it?

• Bohr's model

• Rutherford's model

• Thomson's model

• Dalton's model

Tags

NGSS.MS-PS1-1

The subatomic particles were all discovered and their mass and charge were determined.

a. The mass of a proton is ​ 1​ with a charge of ​​ (a)   and it is located in the ​ (b)   ​ of an atom.

b. The mass of an electron is ​ ​ 0 with a charge of ​ (c)   and it is located in the ​ (d)   c. The mass of a neutron is 1 with a charge of ​ (e)   and it is located in the nucleus of an atom.

• +1
• nucleus
• -1
• electron cloud
• 0

What is the same about the following elements? Different?

• same protons, different neutrons

• same electrons, different protons

• same neutrons, different electrons

• same atomic number, different atomic mass

Tags

NGSS.MS-PS1-1