Honors Chemistry Unit 3 (Atomic Structure and Nuclear Chem)

The Law of Conservation of Mass states that in ordinary chemical reactions, mass is

• neither created nor destroyed

• always greater on the reactants side than the products side

• always greater on the products side than the reactants side

• 100% converted into energy

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NGSS.HS-PS1-7

Which of the following pairs of compounds demonstrates the Law of Multiple Proportions?

• CO and CO₂

• H₂O and H₂S

• HCl and Cl₂

• NaCl and H₂O

J.J. Thomson discovered negatively charged particles called __________________ and developed the ________________________ model to try to explain their existence in a neutral atom.

• electrons; Rutherfordian

• electrons; Plum-Pudding

• protons; proton

• protons; Plum-Pudding

Rutherford's gold-foil experiments concluded that all atoms have a small, dense, positively charged nucleus which makes up nearly all of the ______________ of an atom.

• volume

• mass

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NGSS.HS-PS1-8

NGSS.HS-PS1-7

The Bohr model of the atom showed that electrons can have different energy values and restricted the electrons positions to be ______________________

• in an electron cloud

• inside the nucleus

• in distinct energy levels (or orbits)

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

In the nuclear symbol shown, how many protons are there?

• 36

• 17

• -1

• 19

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NGSS.HS-PS1-8

In the nuclear symbol shown, how many neutrons are there?

• 14

• 6

• 8

• 20

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NGSS.HS-PS1-8

In the nuclear symbol shown, how many total electrons are there?

• 23

• 11

• 12

• 10

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NGSS.HS-PS1-1

Based on the symbol shown of an oxide ion, how many total electrons does it have? (only put the number as your answer)

(a)  

Use the image to help. How many neutrons would there be in an atom of silver-107?

• 107

• 47

• 60

• 61

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NGSS.MS-PS1-1