Test 1

Question 1

Determine the empirical formula for a molecule that consists of 2.677g of barium and 3.155g of bromine.

Answer 1

BaBr2

Question 2

Determine the molecular formula of an unknown molecule given its empirical formula (CH2Br) and molar mass (187.86g/mol).

Answer 2

C2H4Br2

Question 3

Convert 7.6 um to meters.

Answer 3

7.6 x 10^-6m

Question 4

Determine the number of moles of glucose (C6H12O6) that are present in a 31.80g sample of glucose.

Answer 4

0.1765 mol

Question 5

Determine the name for N2O5

Answer 5

Dinitrogen pentoxide

Question 6

Write the name for Sr3(PO4)2

Answer 6

Strontium phosphate

Question 7

Identify the compound with ionic bonds: O2, H2O, Kr, CO, NaBr

Answer 7

NaBr

Question 8

What is the charge on the Co ions in Co2O3

Answer 8

3+

Question 9

Round the following number to four sig figs and express in exponential notation: 25.6623 x 10^5

Answer 9

2.566 x 10^6

Question 10

Calculate the molar mass for Mg(ClO4)2

Answer 10

223.21g/mol

Question 11

Identify the element that fluorine forms a covalent bond with: silver, calcium, nitrogen, iron, sodium

Answer 11

Nitrogen