Exam 1 Chem 3A

Sig Figs and Conversions

100

What is the correct number of sigfigs in 3792.0?

5

200

What is 135 L converted to nL?

1.35 x 10¹¹ nL (135,000,000,000 nL)

300

Determine the mass of an object that has a volume of 455 mL and a density of 13.8 g/mL.

6,279 g

400

If an object has a density of 12.7 g/cm³, what is its density in units of kg/m³?

12700 kg/m³ (1.27 x 10⁴)

Periodic Table and Compounds

100

The ionic charge formed by an element in the Halogens group.

-1

200

What is the ionic charge of Aluminum in Al₂(SO₄)₃?

+3

300

What is the chemical symbol for the following?

 p⁺:31    n⁰:38   e^-:28

Ga⁺³

400

What is the FULL electron configuration of Sn?

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p²

Nomenclature

100

What is the name of the ion Br^-?

Bromide

200

Give the chemical formula of Calcium Hydrogen Phosphate.

CaHPO₄

300

What is the name of the acid H_s(SO₄)

Sulfuric Acid

400

What is the systematic name for the compound N₂Cl₄?

Dinitrogen Tetrachloride

Atomic Structureand Bonds

100

What is the bond formed between two nonmetals?

Covalent Bond

200

How do Cations form?

An atom losing electrons

300

How many 3p electrons does Potassium have?

6

400

According to the Bohr model of the atom, what occurs when an electron moves from n=6 to n=2?

Photon (light) emission

Miscellaneous

100

What type of mixture is Coffee?

Homogenous

200

 How would you classify sugar(C₁₂H₂₂O₁₁)?

Pure substance - Compound

300

How many ORBITALS can have the 3d descriptor in a given atom?

5

400

Which of the following species has an electron configuration of 1s²2s²2p⁶3s²3p⁶? Answer can be more than one.

1. Ar    2. S^-2   3. F^-   4. Ga³⁺ 

1, 2, and 4