Chem Exam

What's the element

100

An alkaline earth element that is on the same period as Arsenic. 

What is calcium?

200

Which halogen is in the same period as Rb

Iodine

300

An atom has a mass number of 48, an atomic number of 23 and has a charge of -2. What's the element?

e-=25

n=25

p=23

V

400

Has a neutral charge and 77 protons.

What is iridium?

500

The most electronegativite element on the periodic table.

What is Fluorine? 

Name that Compound

100

oxygen and sodium 

What is Na₂O? 

200

Name the chemical formula: 

dichlorine heptoxide

What is Cl₂O₇?

300

Name compound:

Al₂(CO₃)₃

What is aluminum carbonate?

400

Name the compound:

Ti₂(SO₄)₃

What is titanium(III) sulfate?

500

what is the chemical formula and name for the bonding of

Al (3+) and F

aluminum fluoride

What's the conversion

100

Convert 35,000mg to kg. 

What is 0.035kg?

200

Beryllium is a light metal used to fabricate transparent X-ray windows for medical imaging instruments. How many moles of Be are in thin-foil window weighing 3.24g?

0.360mol

300

6.5g N₂O is equivalent to how many moles? 

0.15mol N₂O

400

Determine the amount of molecules contained in 9.213g of C₄H₁₀ and the amount of atoms in hydrogen. 

What is 9.545 x 10²² molecules C₄H₁₀ and 9.545 x 10²³ atoms H?

500

Determine the number of moles of the compound and determine the number of moles of each type of atoms: aluminum sulfate. (sig fig: 4)

Al₂(SO₄)₃ = 0.229mol

Al=0.459

S= 0.687

O=2.748

Molecular formula

100

A compound of carbon and hydrogen contains 92.3% C and has a molar mass of 78.1 g/mol. What is the molecular formula?

C₆H₆

200

Find the empirical formula for 15.8% C and 84.2% S

CS₂

300

Nicotine contains 74.02% C, 8.710% H, and 17.27% N. The molar mass is 162.3. What is the molecular formula?

C₁₀H₁₄N₂

400

What is the molecular formula of a compound with a percent  composition of 49.47% C, 5.201% H, 28.84% N, and 16.84% O and molecular mass of 194.2amu?

C₈H₁₀N₄O₂

500

Find the empirical formula of 28.03% Mg, 21.6% Si, 1.16% H, and 49.21% O

Mg₃Si₂H₃O₈

????

100

Group that is very chemically inert?

Noble gases

200

Determine how many sub-atomic particles a 3+ charge iodine has with a mass of 107? 

e= 50

p= 53

n= 54

300

How many sig fig are in 0.0030460

5

400

Aspirin is a compound (C₉H₈O₄). Determine the percent composition of all the elements. (3 sig figs)

C= 60.0%

H= 4.48%

O=35.5% 

500

What is the mass of 6.00 cm³ of mercury, the density is 13.5939g/cm³?

81.6g