Honors Chem S1 Review

Atoms and Radioactivity

100

What is the atomic symbol for Silicon?

Si

200

Name the scientist and the experiment that discovered the nucleus/proton

Rutherford and the Gold Foil Experiment

300

How many neutrons are in an atom of Calcium-41 ?

21

400

Name the isotope (element and mass number) of the product of alpha decay of Pa-231

Actinium - 227

500

An isotope of Tc has a half-life of 6.0 hrs. What mass of a 120mg sample would remain after 1.0 days?

7.5mg (4 half-lives)

Matter and Measurement

100

Dissolving and boiling are examples of what kind of change?

Physical

200

Which of these is a homogeneous mixture: Copper, Air, Soup, Carbon dioxide

Air

300

How many micrograms in 2.41g (give answer in scientific notation)

2.41 x 10⁶ micrograms

400

How many L in 361 cm³

0.361 L

500

How many atoms are in 4.55 grams of solid silver?

2.54 x 10²² silver atoms

Electrons and Periodicity

100

What type of sunlight can cause skin cancer?

UV

200

What word describes the fact that electrons can only have certain energies inside an atom?

Quantized

300

What is the correct order for the following atoms/ions if they were to be arranged in order of increasing atomic radius?

Ca²⁺, Ar, Cl^-, S^2-, K⁺

Ca²⁺, K⁺, Ar, Cl^-, S^2-

400

What is the name of the group of elements that has 7 valence electrons?

Halogens

500

Between B and C, which has the higher first ionization energy? Explain this with reference to radius and Zeff

C: smaller radius and higher Zeff

Bonding

100

What type of bond exists in the compound BaF₂

Ionic

200

Give the molecular geometry name and bond angle(s) of SCl₄

See-saw, 90 and 120

300

Which of the following bonds is the most polar without being considered ionic? N-O, O-O, N-Cl, Na-Cl

N-Cl

400

Which of the following has the highest melting point and what type of bonding/structure does it have? CH₄, NaCl, SiO₂, NF₃

SiO₂ giant/network covalent

500

Which of the following shows RESONANCE? CO₂, NF₃, CO, H₂CO, O₃, PF₅

O₃

Reactions

100

What are the products in the combustion of a hydrocarbon?

CO₂ and H₂O

200

What is the formula of perchloric acid?

HClO₄

300

What is the coefficient for hydrogen if the following equation is balanced?

NH₃ -> N₂ + H₂

3

400

What are two signs that a chemical reaction has occurred? 

any combination of: color change, temperature change, production of gas, production of solid (precipitate), change in mass, change in pH

500

What is the coefficient for oxygen when the equation below is balanced?

C₃H₇OH + O₂ -> CO₂ + H₂O

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